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50PMC20

Carrier 48PGC05, 48PGC03, 48PGC04, 48PGC06, 48PGC07 Operation And Service Manual

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48/50PG C03-14 48/50PM C16-28 Single Package Rooftop Units With COMFORTLinkt Controls Version 5.x and PURONR (R-410A) Refrigerant
Controls, Start-Up, Operation, Service
and Troubleshooting Instructions
IMPORTANT: This literature covers 48/50PG03−14 and 48/50PM16−28 models with Comfortlink Software version 5.x. The 48/50PG C16−28 (15 – 25 ton) model reference has been removed from this manual; however version 5.x software is backward compatible with all Comfortlink PG models. Refer to past manuals for obsolete model information.
TABLE OF CONTENTS
Page
SAFETY CONSIDERATIONS 2.........................
GENERAL 3.........................................
BASIC CONTROL USAGE 3...........................
ComfortLink Control 3..............................
Scrolling Marquee 3..................................
Accessory Navigator Display 4..........................
Operation 4.........................................
System Pilot and Touch Pilot Devices 4.................
CCN Tables and Display 4.............................
Conventions Used in This Manual 6......................
START−UP 6.........................................
Unit Preparation 6....................................
Compressor Mounting 6...............................
Refrigerant Service Ports 6.............................
Crankcase Heater(s) 6.................................
Compressor Rotation 6................................
Power Supply 6.....................................
Internal Wiring 6.....................................
Evaporator Fan 6....................................
Condenser Fans and Motors 8...........................
Return−Air Filters 8..................................
Outdoor−Air Inlet Screens 8............................
Air Baffles 8........................................
Accessory Installation 8...............................
Orifice Change (48PG and 48PM) 8......................
Gas Heat (48PG and 48PM) 8..........................
EnergyX 8.........................................
CONTROLS QUICK SET−UP 8.........................
Control Set Point and Configuration Log 8................
Thermostat Control 8.................................
Space Temperature Sensor Control − Direct Wired
(T−55 or T−56 or T−59) 9.............................
T−58 Communicating Room Sensor 9....................
CCN Linkage Control 9...............................
System Pilot − Communication Space Sensor 9.............
Thermidistat Control 9................................
Space Humidistat Control 9............................
Relative Humidity Sensor Control 9......................
CCN Communication 9...............................
Accessories 9.......................................
Programming Operating Schedules 10....................
SERVICE TEST 12....................................
Independent Outputs 12...............................
Fan Test 12.........................................
Cooling Test 12.....................................
Humidi−MiZer Test 12..............................
Heating Test 13......................................
THIRD PARTY CONTROL 13..........................
Cooling/Heating Control 13............................
Dehumidification Control 13...........................
Remote Occupancy 13................................
Fire Shutdown 13....................................
Alarm Output 13.....................................
Economizer Monitoring 14.............................
Economizer Damper Control 14.........................
CONTROLS OPERATION 14...........................
Display Configuration 14..............................
Unit Configuration 14.................................
Modes 15..........................................
General Operation 16.................................
Temperature Setpoint Determination 16...................
Occupancy Determination 17...........................
Indoor Fan Operation 17...............................
Cooling Operation 18.................................
Heating Operation 21.................................
Economizer 23......................................
Optional Humidi−MiZer Dehumidification System 24......
Indoor Air Quality (IAQ) 30............................
EnergyX 34........................................
Adaptive Fan 34.....................................
Temperature Compensated Start 35.......................
Carrier Comfort Network (CCN) Configuration 35.........
Demand Limit 36....................................
Linkage 36.........................................
Alarm Handling 37...................................
TROUBLESHOOTING 37..............................
Complete Unit Stoppage 37............................
Restart Procedure 37..................................
Alarms and Alerts 37.................................
Control Module Communication 44......................
Communication Failures 44............................
Cooling Troubleshooting 45............................
Humidi−MiZer Troubleshooting 46....................
Economizer Troubleshooting 47.........................
Heating Troubleshooting 48............................
Phase Loss Protection 51..............................
Thermistor Troubleshooting 51.........................
Transducer Troubleshooting 52.........................
Forcing Inputs and Outputs 52..........................
MAJOR SYSTEM COMPONENTS 55....................
General 55.........................................
Main Base Board (MBB) 71............................
Economizer Control Board (ECB) 73.....................
48/50PG and PM
Integrated Gas Control (IGC) Board 75...................
Low Voltage Terminal Strip (TB1) 76.....................
Scrolling Marquee Display 77..........................
Accessory Navigator Display 77.......................
Carrier Comfort Network (CCN) Interface 77.............
EnergyX 78........................................
Field−Installed Accessories 79..........................
SERVICE 82.........................................
Cleaning 82........................................
Lubrication 84......................................
Evaporator Fan Service and Replacement 85...............
Evaporator Fan Performance Adjustment 86...............
Evaporator Fan Belt Tension Adjustment 86...............
Condenser−Fan Adjustment 87..........................
NOVATION Heat Exchanger Condenser
Service and Replacement 87............................
Verify Sensor Performance 87..........................
Economizer Operation During Power Failure 87............
Evacuation 87.......................................
Refrigerant Charge 88.................................
Gas Valve Adjustment (48PG and 48PM) 91...............
High Altitude (48PG and 48PM) 92......................
Main Burners (48PG and 48PM) 92......................
Filter Drier 93.......................................
Protective Devices 93.................................
Relief Devices 93....................................
Control Circuit, 24−V93..............................
Replacement Parts 93.................................
Diagnostic LEDs 93..................................
EnergyX 93........................................
APPENDIX A − LOCAL DISPLAY AND
CCN TABLES 94.....................................
APPENDIX B − CONTROL MODES WITH
Humidi−MiZer SYSTEM AND ECONOMIZER 112........
APPENDIX C − START−UP DATA 113...................
APPENDIX D − ADDITIONAL START−UP DATA 169......
CONTROL SET POINT AND CONFIGURATION LOG 180...
INDICATE UNIT SETTINGS BELOW 180................
UNIT START−UP CHECKLIST 188......................
SAFETY CONSIDERATIONS
When working on air-conditioning equipment, observe precautions in the literature, tags and labels attached to the unit, and other safety precautions that may apply. Follow all safety codes. Wear safety glasses and work gloves. Use quenching cloth for unbrazing operations. Have fire extinguishers available for all brazing operations.
Follow all safety codes. Wear safety glasses and work gloves. Have fire extinguisher available. Read these instructions thoroughly and follow all warnings or cautions attached to the unit. Consult local building codes and National Electrical Code (NEC) for special requirements.
Recognize safety information. This is the safety−alert symbol When you see this symbol on the unit and in instructions or manuals, be alert to the potential for personal injury.
Understand the signal words DANGER, WARNING, and CAUTION. These words are used with the safety−alert symbol. DANGER identifies the most serious hazards which will result in severe personal injury or death. WARNING signifies a hazard which could result in personal injury or death. CAUTION is used to identify unsafe practices which may result in minor personal injury or product and property damage. NOTE is used to highlight suggestions which will result in enhanced installation, reliability, or operation.
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal injury or death.
Before performing service or maintenance operations on unit, turn off main power switch to unit and install lockout tag. Ensure electrical service to rooftop unit agrees with voltage and amperage listed on the unit rating plate.
!
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may cause equipment damage.
This unit uses a microprocessor−based electronic control system. Do not use jumpers or other tools to short out components or to bypass or otherwise depart from recommended procedures. Any short−to−ground of the control board or accompanying wiring may destroy the electronic modules or electrical components.
.
2
!
WARNING
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal injury, death and/or property damage.
Improper installation, adjustment, alteration, service, or maintenance can cause property damage, personal injury, or loss of life. Refer to the User’s Information Manual provided with this unit for more details. Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.
What to do if you smell gas:
1. DO NOT try to light any appliance.
2. DO NOT touch any electrical switch, or use any phone in your building.
3.IMMEDIATELY call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions.
4. If you cannot reach your gas supplier, call the fire department.
GENERAL
This publication contains Start−Up, Controls, Operation, Service, and Troubleshooting information for the 48/50PG and 48/50PM rooftop units. (See Table 1.) These units are equipped with ComfortLink controls version 5.X or higher and use Puron refrigerant. The specific base unit installation instructions and/or wiring label diagram may also be required in conjunction with this book as a guide to a specific unit on the roof. All the units in table 1 are Constant Volume (CV) units that provide stand−alone or network operation.
Table 1 – Rooftop Units
MODEL SIZE NOMINAL TONS
03 2 04 3 05 4
48/50PG
48/50PM
06 5 07 6 08 7.5 09 8.5 12 10 14 12.5 16 15 20 18 24 20 28
25
BASIC CONTROL USAGE
ComfortLink Control
The ComfortLink control is a comprehensive unit-management system. The control system is easy to access, configure, diagnose and troubleshoot.
The ComfortLink control is fully communicating and cable-ready for connection to the Carrier Comfort Network (CCN) building management system. The control provides high-speed communications for remote monitoring via the Internet. Multiple units can be linked together (and to other ComfortLink control equipped units) using a 3-wire communication bus.
The ComfortLink control system is easy to access through the use of a unit-mounted display module. There is no need to bring a separate computer to this unit for start-up. Access to control menus is simplified by the ability to quickly select from 11 menus. A scrolling readout provides detailed explanations of control information. Only four, large, easy-to-use buttons are required to maneuver through the entire controls menu. The display readout is designed to be visible even in bright sunlight.
For added service flexibility, an accessory hand-held Navigator module is also available. This portable device has an extended communication cable that can be plugged into the unit’s communication network at the main control box. The Navigator display provides the same menu structure, control access and display data as is available at the unit-mounted Scrolling Marquee display.
MODE
Run Status Service Test Temperature Pressures Setpoints Inputs Outputs Configuration Time Clock Operating Modes Alarms
Alarm Status
ESCAPE
ENTER
C06320
Fig. 1 − Scrolling Marquee
Scrolling Marquee
This device is the keypad interface used to access the control information, read sensor values, and test the unit. The Scrolling Marquee is located in the main control box and is standard on all units. The Scrolling Marquee display is a 4-key, 4-character, 16-segment LED (light-emitting diode) display module. The display also contains an Alarm Status LED. (See Fig. 1.)
The display is easy to operate using 4 buttons and a group of 11 LEDs that indicate the following menu structures:
Run StatusService TestTemperaturesPressuresSet pointsInputsOutputsConfigurationTimeclockOperating ModesAlarms
Through the Scrolling Marquee, the user can access all of the inputs and outputs to check on their values and status, configure operating parameters plus evaluate the current decision status for operating modes. The control also includes an alarm history which can be accessed from the display. In addition, through the Scrolling Marquee, the user can access a built-in test routine that can be used at start-up commissioning and to diagnose operational problems with the unit. (See Table 2.)
48/50PG and PM
3
Accessory Navigator Display
The accessory hand-held Navigator display can be used with the 48/50PG and 48/50PM units. (See Fig. 2.) The Navigator display operates the same way as the Scrolling Marquee device. The Navigator display is plugged into the LEN (local equipment network) port on either TB1/TB2 or the J3 port on the ECB (economizer control board).
48/50PG and PM
Operation
All units are shipped from the factory with the Scrolling Marquee display, which is located in the main control box. (See Fig. 1.) In addition, the ComfortLink control also supports the use of the handheld Navigator display.
Both displays provide the user with an interface to the ComfortLink control system. The displays have up and down arrow keys, an ESCAPE key and an ENTER key. These keys are used to navigate through the different levels of the display structure. The Navigator display and the Scrolling Marquee operate in the same manner, except that the Navigator display has multiple lines of display and the Scrolling Marquee has a single line. All further discussions and examples in this document will be based on the Scrolling Marquee display. See Table 2 for the menu structure.
The four keys are used to navigate through the display structure, which is organized in a tiered mode structure. If the buttons have not been used for a period, the display will default to the AUTO VIEW display category as shown under the RUN STATUS category. To show the top-level display, press the ESCAPE key until a blank display is shown. Then use the up and down arrow keys to scroll through the top-level categories. These are listed in Appendix A and will be indicated on the Scrolling Marquee by the LED next to each mode listed on the face of the display.
When a specific mode or sub-mode is located, push the ENTER key to enter the mode. Depending on the mode, there may be additional tiers. Continue to use the up and down keys and the ENTER keys until the desired display item is found. At any time, the user can move back a mode level by pressing the ESCAPE key. Once an item has been selected the display will flash showing the item, followed by the item value and then followed by the item units (if any).
Items in the Configuration and Service Test modes are password protected. The display will flash PASS and WORD when required. Use the ENTER and arrow keys to enter the four digits of the password. The default password is 1111.
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f
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N
in
A
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I
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A
T
O
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D
Ru
n Sta
S
e
rv
ice
T
em
p
era
P
res
s
ure
s
S
e
tpo
in
ts
In
pu
ts
O
utp
uts
C
on
fig
u
ra
tion
T
im
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lo
ck
O
per
ating
M
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2
T
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5
8
5
4
T
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6
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F
4
4
P
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4
4
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0
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F
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Ala
rm
Sta
tus
tu
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Te
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t
ture
s
E
S
C
Fig. 2 − Accessory Navigator Display
Pressing the ESCAPE and ENTER keys simultaneously will scroll an expanded text description across the display indicating the full meaning of each display point. Pressing the ESCAPE and ENTER keys when the display is blank (MODE LED level) will return the display to its default menu of rotating AUTO VIEW display items. In addition, the password will need to be entered again before changes can be made.
Changing item values or testing outputs is accomplished in the same manner. Locate and display the desired item. If the display is
k
in rotating auto-view, press the ENTER key to stop the display at the desired item. Press the ENTER key again so that the item value flashes. Use the arrow keys to change the value of state of an item and press the ENTER key to accept it. Press the ESCAPE key and the item, value or units display will resume. Repeat the process as required for other items.
There are some points that can be forced from the Scrolling Marquee or the Navigator. If the user needs to force a variable, follow the same process as when editing a configuration parameter. A forced variable, regardless where the force has come from will be displayed with a blinking “.” on a Scrolling Marquee and a blinking “f” on a Navigator following its value. For example, if economizer commanded position (EC.CP) is forced, the Navigator display shows “80f”, where the “f” is blinking to signify a force on the point. The Scrolling Marquee display shows “80.” Where the “.” is blinking to signify a force on the point. Remove the force by
C06321
selecting the point that is forced with the key ENTER and then pressing the up and down arrow keys simultaneously.
Depending on the unit model, factory-installed options and field-installed accessories, some of the items in the various Mode categories may not apply.
System Pilott and Touch Pilot Devices
The System Pilot device (33PILOT-01) and Touch Pilot device (33CNTPILOT) can be used as CCN communication user−interfaces. These devices can be put on the CCN bus and addressed to communicate with any other device on the network. Unlike the Scrolling Marquee and Navigator, these pilots read the unit’s CCN tables and its CCN points can be monitored, forced, or configured. The Pilot devices can be used to install and commission a 3V zoning system, linkage compatible air source, universal controller, and all other devices operating on the Carrier communicating network.
Additionally, the System Pilot device can serve as a wall-mounted temperature sensor for space temperature measurement. The occupant can use the System Pilot device to change set points. A security feature is provided to limit access of features for unauthorized users. See Fig. 3 for System Pilot device details.
CCN Tables and Display
In addition to the unit−mounted Scrolling Marquee display, the user can also access the same information through the CCN tables by using the Service tool or other CCN programs/devices. The variable names used for the CCN tables and the Scrolling Marquee menus may be different and more items may be displayed in the CCN tables. Details on the CCN tables are included with the local display menus in Appendix A. Appendix A is structured towards the organization of the local display (Scrolling Marquee) menus. Because of the variety of CCN programs and devices, the CCN tables, sub−tables, and points are referenced within that organization.
4
RUN
/
STATUS
Auto View
of
Run Status
(VIEW)
↓
Software
Version
Numbers
(VERS)
↓
Control
Modes
(MODE)
↓
Cooling
Status
(COOL)
↓
Heating
Status
(HEAT)
↓
Economizer
Status
(ECON)
↓
Outside Air Unit Status
(OAU)
↓
Component
Run Hours
(HRS)
↓
Component
Starts
(STRT)
SERVICE
TEST
Service Test
Mode
(TEST)
↓
Test Indepen
dent
Outputs
(INDP)
↓
Test Fans
(FANS)
↓
Test Cooling
(COOL)
↓
Test
Humidi‐MiZer™
(HMZR)
↓
Test Heating
(HEAT)
Table 2 – Scrolling Marquee Mode and Menu Display Structure
TEMPERATURES PRESSURES SETPOINTS INPUTS OUTPUTS CONFIGURATION
Air
Temperatures
(AIR.T)
↓
Refrigerant
Temperatures
(REF.T)
Thermostat
Inputs
(STAT)
↓
General In
puts
(GEN.I)
↓
Current
Sensor In
puts
(CS.IN)
↓
Air Quality
Inputs
(AIR.Q)
Fan
Outputs
(FANS)
↓
Cool Outputs (COOL)
↓
Heat Outputs
(HEAT)
↓
Economiz
er Outputs (ECON)
↓
Alarm Relay
(ALRM)
Display
Configuration
(DISP)
↓
Unit
Configuration
(UNIT)
↓
Cooling
Configuration
(COOL)
↓
Humidi‐MiZer™
Config.
(HMZR)
↓
Heating
Configuration
(HEAT)
↓
Economizer
Configuration
(ECON)
↓
Air Quality
Cfg.
(AIR.Q)
↓
Outside Air Unit
Configuration
(OAU)
↓
Adaptive Fan
Configuration
(A.FN)
↓
Alarm Relay
Config.
(ALM.O)
↓
Sensor
Calibration
(TRIM)
↓
CCN
Configuration
(CCN)
TIME
CLOCK
Time of
Day
(TIME)
↓
Month,
Date
Day and
Year
(DATE)
↓
Daylight
Savings
Time
(DST)
↓
Local Time
Schedule
(SCH.L)
↓
Local
Holiday
Schedules
(HOL.L)
OPERATING
MODES
Control
Modes
(MODE)
↓
Cool Mode
Diagnostic
(COOL)
↓
Heat Mode
Diagnostic
(HEAT)
↓
Economizer
Diagnostic
(ECON)
↓
Outside Air Unit
Diagnostic
(OAU)
↓
Demand
Listing
(DMD.L)
ALARMS
Reset All
Current
Alarms
(R.CURR)
↓
Reset Alarm
History
(R.HIST)
↓
Currently
Active
Alarms
(CURR)
↓
Alarm
HIstory
(HIST)
48/50PG and PM
NAVIGATE/ EXIT
SCROLL
+
-
PAGE
MODIFY SELECT
C06322
Fig. 3 − System Pilott User Interface
Force Hierarchy
There is a hierarchy in CCN with regards to forcing a point. Programs and devices write a force at different priority levels. A higher level (smaller number, 1 being the highest) will override a lower level force. The Scrolling Marquee uses a Control Force at level 7. The Navigator writes a Service Force which is level 3. System Pilots and Touch Pilots write Supervisor Forces at level 4. Network programs can be set to write different level priority forces.
Generic Status Display Table
The GENERIC points table allows the service/installer the ability to create a custom table in which up to 20 points from the 5 CCN categories (Points, Config, Service−Config, Set Point, and Maintenance) may be collected and displayed.
In the Service−Config table section, there is a table named “GENERICS.” This table contains placeholders for up to 20 CCN point names and allows the user to decide which points are displayed in the GENERIC points sub−table under the status display table. Each one of these placeholders allows the input of an 8−character ASCII string. Using a CCN interface, enter the Edit mode for the Service−Config table “GENERICS” and enter the CCN name for each point to be displayed in the custom points table in the order they will be displayed. When done entering point names, download the table to the rooftop unit control.
IMPORTANT: The computer system software (ComfortVIEW, Service Tool, etc.) that is used to interact with CCN controls, always saves a template of items it considers as static (e.g., limits, units, forcibility, 24−character text strings, and point names) after the software uploads the tables from a control. Thereafter, the software is only concerned with run time data like value and hardware/force status. With this in mind, it is important that anytime a change is made to the Service−Config table “GENERICS” (which in turn changes the points contained in the GENERIC point table), that a complete new upload be performed. This requires that any previous table database be completely removed first. Failure to do this will not allow the user to display the new points that have been created and the CCN interface will have a different table database than the unit control.
5
Conventions Used in This Manual
The following conventions for discussing configuration points for the local display (Scrolling Marquee or Navigator accessory) will be used in this manual.
Point names will be written with the Mode name first, then any submodes, then the point name, each separated by an arrow symbol (→). Names will also be shown in bold and italics. As an example, the Thermostat Control Type which is located in the Configuration mode, and Unit sub-mode would be written as Configuration→
UNIT→T.CTL.
This path name will show the user how to navigate through the local display to reach the desired configuration. The user would scroll through the modes and sub-modes using the up and down keys. The arrow symbol in the path name represents pressing ENTER to move into the next level of the menu structure.
When a value is included as part of the path name, it will be shown at the end of the path name after an equals sign. If the value represents a configuration setting, an explanation will be shown in parenthesis after the value. As an example, Configuration→UNIT→T.CTL = 1 (1 Stage Y1).
Pressing the ESCAPE and ENTER keys simultaneously will scroll an expanded text description of the point name across the display.
48/50PG and PM
The expanded description is shown in the local display tables but will not be shown with the path names in text.
The CCN point names are also referenced in the local display tables for users configuring the unit with CCN software instead of the local display. See Appendix A of this manual.
IMPORTANT: Do not attempt to start unit, even momentarily, until all items on the Start−Up Checklist (last page) and the following steps have been read/completed.
Unit Preparation
Check that unit has been installed in accordance with these installation instructions and all applicable codes.
Compressor Mounting
Compressors are internally spring mounted. Do not loosen or remove compressor holddown bolts.
Refrigerant Service Ports
Each independent refrigerant system has a total of 3 Schrader-type service gauge ports per circuit. One port is located on the suction line, one on the compressor discharge line, and one on the liquid line. Be sure that caps on the ports are tight.
Crankcase Heater(s)
IMPORTANT: Unit power must be on for 24 hours prior to start−up. Otherwise, damage to compressor may result.
START-UP
Compressor Rotation
!
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in unit damage.
Improper wiring will cause compressor stoppage and alarm. Correct wiring by switching leads as indicated below.
On 3-phase units, it is important to be certain the compressors are rotating in the proper direction. To determine whether or not compressors are rotating in the proper direction, use a phase-rotation meter on the unit input power to check for L1-L2-L3 or clockwise rotation or use the Service Test mode to energize a compressor. If the compressor is rotating in the wrong direction, the controls will stop the compressor and display alarm for “Circuit x Failure to Pressurize,” where x is the corresponding A, B or C compressor circuit.
NOTE: Indoor or outdoor fan rotation direction may not indicate proper input power phase sequence, as some 3-phase units use single-phase fan motors.
To correct the wrong compressor rotation direction, perform the following procedure:
1. Turn off power to the unit and lock out the power.
2. Switch any two of the incoming unit power leads.
3. Turn on power to the unit.
4. Verify corrected compressor rotation.
Power Supply
All 208/230-v units are factory wired for 230-v power supply. If the 208/230-v unit is to be connected to a 208-v power supply, the transformers (TRAN1, TRAN2 and TRAN3) must be rewired by moving the wire from the 230-volt connection and moving to the 200-volt terminal on the primary side of the transformer. Refer to unit label diagram for additional information.
Internal Wiring
Check all electrical connections in unit control boxes; tighten as required.
Evaporator Fan
NOTE: Units equipped with Adaptive Fan still must conform to minimum CFM requirements at all times and the fan speed configurations must be set for this compliance.
6
OUTDOOR AIR SCREEN (HIDDEN)
ELECTRICAL
OPTIONS PANEL
CONTROL BOX AND COMPRESSOR
INDOOR MOTOR ACCESS DOOR
CONDENSER COIL
ACCESS PANEL
BASEPAN CONNECTIONS
ACCESS PANEL
FILTER ACCESS DOOR
Fig. 4 − 48/50PG03−14 Size Units, Panel and Filter Locations (48PG03−07 Unit Shown)
OUTDOOR AIR
SCREEN
(HIDDEN)
PEM 1 & 2
CONTROL BOX
CONVENIENCE
OUTLET
CO SENSOR
2
RETURN SMOKE DETECTOR SMOKE CONTROL MODULE
FILTER ACCESS
DOOR
GAS SECTION
Fig. 5 − 48/50PM16−28 Size Units, Panel and Filter Locations (48PM24 Unit Shown)
GAS SECTION ACCESS
48/50PG and PM
C07002
C08076
7
Condenser Fans and Motors
Condenser fans and motors are factory set. Refer to Condenser-Fan Adjustment section as required.
Return−Air Filters
Check that correct filters are installed in filter tracks (see Physical Data table in Installation Instructions). Do not operate unit without return-air filters.
NOTE: For units with 4-in. filter option, units are shipped with standard 2-in. filters. To install 4-in. filters, the filter spacers must be removed.
Outdoor−Air Inlet Screens
Outdoor-air inlet screens must be in place before operating unit.
Air Baffles
Units with Humidi-MiZer option are equipped with Motormaster control to maintain adequate discharge pressure for proper unit operation during low ambient operation. Field-fabricated and installed wind baffles may be required. See Optional Humidi-MiZer Dehumidification System section.
Accessory Installation
Check to make sure that all accessories including space thermostats
48/50PG and PM
and sensors have been installed and wired as required by the instructions and unit wiring diagrams.
Orifice Change (48PG and 48PM)
This unit is factory assembled for heating operation using natural gas at an elevation from sea level to 2000 ft.
Use accessory high altitude kit when installing this unit at an elevation of 2000 to 7000 ft. For elevations above 7000 ft, refer to High Altitude section to identify the correct orifice size for the elevation. Purchase these orifices from your local Carrier dealer. Follow instructions in accessory Installation Instructions to install the correct orifices.
Use accessory LP (liquid propane) gas conversion kit when converting this unit for use with LP fuel usage for elevations up to 7000 ft. For elevations above 7000 ft, refer to High Altitude section to identify the correct orifice size for the elevation. Purchase these orifices from your local Carrier dealer. Follow instructions in accessory Installation Instructions to install the correct orifices.
Gas Heat (48PG and 48PM)
Inspect the gas heat section of the unit. Verify the number of burners match the number of heat exchanger openings and the burner assembly is properly aligned. If the orifices were changed out for elevation or Liquid Propane purposes, verify proper installation. Visually inspect other components in heat section.
Verify gas pressures before turning on heat as follows:
1. Turn off field-supplied manual gas stop, located external to unit.
2. Connect pressure gauge to supply gas tap, located on field-supplied manual shutoff valve. (See Fig. 6.)
3. Connect pressure gauge to manifold pressure tap.
4. Turn on field-supplied manual gas stop. Enter Service Test mode by setting Service Test→TEST to “ON” using the Scrolling Marquee display. Temporarily install the jumper wire between “R” and “W1” on TB1. Use the Service Test feature to set Service Test→HEAT→HT.1 to ON (first stage of heat) using the Scrolling Marquee.
MANUAL SHUT OFF
(FIELD SUPPLIED)
GAS
SUPPLY
PRESSURE TAP
(1/8˝ NPT PLUG)
TO
UNIT
UNION
SEDIMENT TRAP
C09242
Fig. 6 − Field Gas Piping
5. After the unit has run for several minutes, verify the supply gas pressure is between 5.5−in. wg to 13.0−in. wg, and the manifold pressure is 3.50−in. wg on sizes 03−14,
3.00−in.wg on sizes 16−28 with a vertical supply or
2.95−in.wg on sizes 16−28 with a horizontal supply. If manifold pressure must be adjusted, refer to Gas Valve Adjustment section.
NOTE: Supply gas pressure must not exceed 13.0−in. wg.
6. Set Service Test→HEAT→HT.1 to OFF using Scrolling Marquee.
7. Remove jumper wire if the unit will be operating under thermostat mode. The jumper must remain if a space temperature sensor (T-55, T-56, T-58, or System Pilot device) will control the unit.
8. Exit Service Test mode by setting Service Test→TEST to “OFF” using the Scrolling Marquee.
EnergyX
For units equipped with the EnergyX factory installed option, there is an EnergyXv2 Supplement Installation Instructions in the unit’s information packet. Follow the start up sequence and complete the start up checklist contained in the EnergyXv2 manual to complete unit startup.
CONTROLS QUICK SET−UP
The following information will provide a quick guide to setting up and configuring the 48/50PG and 48/50PM series units with ComfortLink controls. Unit controls are pre-configured at the factory for factory-installed options. Field-installed accessories will require configuration at start-up. Service Test is recommended for initial start−up. Additionally, specific job requirements may require changes to default configuration values. See the CCN and Display parameter tables and other sections of these instructions for more details. Refer to the Major System Components or accessory installation instructions for specific wiring detail.
Control Set Point and Configuration Log
Thermostat Control
Wire accessory thermostat to the corresponding R, Y1, Y2, W1, W2, and G terminals on the field connection terminal board located at the unit control box.
The Unit Control Type configuration, Configuration →UNIT→U.CTL, default value is for Thermostat (2) so there is no need to configure this item.
The Thermostat Control Type, Configuration →UNIT→T.CTL, selects the unit response to the thermostat inputs above.
8
Space Temperature Sensor Control − Direct Wired (T−55 or T−56 or T−59)
Wire accessory space temperature sensor(s) to the T-55 terminals on the field connection terminal board located at the unit control box. Refer to Field-Installed Accessories section for additional information.
The Unit Control Type configuration, Configuration →UNIT→U.CTL, must be set to Space Sensor (3). The jumper wire in the installer’s packet must be connected between R and W1 for heating mode to operate.
T−58 Communicating Room Sensor
Install the T-58 communicating thermostat. Connect the CCN communication bus from the T-58 to the CCN terminals on the field connection terminal board located at the unit control box. Configure the unit’s CCN communication element number, bus number, and baud rate. Configure the T−58’s CCN communication bus number and baud rate the same as the unit, while the element number has to be different. Configure the T−58 to send SPT to the unit’s element number. Refer to the Field−Installed Accessories section for additional information.
The Unit Control Type configuration, Configuration →UNIT→U.CTL, must be set to Space Sensor (3). The jumper wire in the installer’s packet must be connected between R and W1 for heating mode to operate.
CCN Linkage Control
The CCN communication must be properly configured for the 48/50PG and 48/50PM units and all other devices. Linkage configuration is automatically done by the supervisory CCN Linkage device.
The Unit Control Type configuration, Configuration →UNIT→U.CTL must be set to Space Sensor (3). The jumper wire in the installer’s packet must be connected between R and W1 for heating mode to operate.
Installation of an accessory supply air temperature (SAT) sensor in the supply duct is recommended for Linkage applications. A supply duct SAT measurement is valid for heating mode display, while the factory-standard internal SAT is not valid for heating due to its location upstream of the heating section. When installing the supply duct SAT, the heating mode display is enabled by setting Configuration→HEAT→SAT.H to ENBL.
Installation of an accessory return air temperature (RAT) sensor in the return duct and wired to the space sensor input is recommended for Linkage applications. This will allow the unit to continue to run if Linkage communication is lost.
System Pilot − Communication Space Sensor
Install the System Pilot and connect the CCN communication bus from it to the unit’s CCN connection on the low voltage terminal board. Configure the unit’s CCN communication element number, bus number, and baud rate. Refer to the System Pilot’s installation instructions for configuring it to be used as a space temperature and attaching it to a unit.
Thermidistat Control
The thermidistat is a thermostat and humidistat combined and the inputs are provided on the field connection terminal board. The unit control type configuration, Configuration→UNIT→U.CTL, default value is for thermostat (2) so there is no need to configure this item. The thermostat control type configuration, Configuration→UNIT→T.CTL, selects the unit response to the thermostat inputs above. The space humidity switch configuration, Configuration→UNIT→RH.SW, identifies the normally open or normally closed status of this input at LOW humidity, and the input is the Humidistat 1 terminal (only on Humidi-MiZer units).
Space Humidistat Control
For units with the factory Humidi-MiZer option, the humidistat input is provided on the field connection terminal board. The Space Humidity Switch configuration, Configuration→UNIT→RH.SW, identifies the normally open or normally closed status of this input at LOW humidity. Humidistat 2 terminal is the 24 VAC source for dry contact and the Humidistat 1 terminal is the signal input.
NOTE: On units with Humidi-MiZer, the Humidistat terminals 1 and 2 are the same as the Fire Shutdown terminals 1 and 2 on a standard unit. See Fire Shutdown section.
Relative Humidity Sensor Control
For units with the factory installed Humidi-MiZer option and the economizer option (with the ECB−economizer control board), the humidity sensor input is provided on the field connection terminal board (TB1/TB2). The sensor can be used in addition to or instead of a humidistat or thermidistat. The RH Sensor on OAQ Input configuration, Configuration→UNIT→RH.S=YES, identifies that the sensor is being used instead of an OAQ sensor. Adjust RH setpoints as needed. Terminal 1 is the 24vdc loop power and Terminal 4 is the 4−20 mA signal input. Refer to the Field Installed Accessories and Humidi-MiZer Operation sections for more information.
CCN Communication
Configure Configuration→CCN→CCN.A to desired element number. (Default is 1.) Configure Configuration"CCN" CCN.B to desired bus number. (Default is 0.) Configure Configuration→CCN→BAUD to desired code number for baud rate (Default is 3 = 9600 baud).
Accessories
Below are quick configuration settings for field installed accessories. If these accessories were installed by the factory, they will already be configured. See the Field−Installed Accessories section, third party control, control connection tables, and CCN or Display parameter tables for any accessories not mentioned below and any additional information on accessories.
Economizer
If an Economizer accessory was field installed, the unit must be configured for it by setting Configuration"ECON"EC.EN to YES. The default settings for the other economizer configurations should be satisfactory. If they need to be changed, additional information about these configuration settings can be found in the Economizer section.
Power Exhaust
If a Power Exhaust accessory was field installed, the unit must be configured for it by setting Configuration"ECON"PE.EN to ENBL. The default settings for the other power exhaust configurations should be satisfactory. If they need to be changed, additional information about these configurations can be found in the Power Exhaust section.
Electric Heat
If an Electric Heat accessory was field installed, the unit must be configured for it by setting Configuration→HEAT→HT.TY to a value of 2. The number of electric heat stages must be configured by setting Configuration→HEAT→N.HTR per the installed heater.
Fire Shutdown
If a Fire Shutdown or Smoke Detector accessory was field installed, the unit must be configured for it by setting Configuration→UNIT→FS.SW to normally open (1) or normally closed (2) when there is not a fire alarm. Normally open (1) is the preferred configuration.
48/50PG and PM
9
NOTE: On standard units, the fire shutdown input is the terminals Fire Shutdown 1 and 2. On Humidi-MiZer units, the fire shutdown connections are at PL19.
Outdoor Enthalpy
If an Outdoor Enthalpy accessory was field installed, the unit must be configured for it by setting Configuration→ECON→EN.SW, identifies the normally open or normally closed status of this input when the outdoor enthalpy is low.
IAQ Switch
If an IAQ Switch accessory was field installed, the unit must be configured for it by setting Configuration→AIR.Q→II.CF, identifies the normally open or normally closed status of this input when the indoor air quality value is low (good) and also selects the unit response to this input.
NOTE: An IAQ switch cannot be used if an enthalpy switch is already on this input.
IAQ Sensor
If an CO2 Sensor accessory was field installed, the unit must be configured for it by setting Configuration→AIR.Q→IA.CF selects the unit response to this input. Default conversion to 0 to 2000 ppm.
48/50PG and PM
OAQ Sensor
If an Outdoor Air Quality Sensor accessory was field installed, the unit must be configured for it by setting Configuration→AIR.Q →OA.CF selects the unit response to this input. Default conversion to 0 to 2000 ppm.
Fan Status
Filter Status
If a Filter Status accessory was field installed, the unit must be configured for it by setting Configuration→UNIT→FL.SW to normally open (1) or normally closed (2). Normally open (1) is the preferred configuration.
Programming Operating Schedules
The ComfortLink controls will accommodate up to eight different schedules (Periods 1 through 8), and each schedule is assigned to the desired days of the week. Each schedule includes an occupied on and off time. As an example, to set an occupied schedule for 8 AM to 5 PM for Monday through Friday, the user would set days Monday through Friday to ON for Period 1. Then the user would configure the Period 1 Occupied From point to 08:00 and the Period 1 Occupied To point to 17:00. To create a different weekend schedule, the user would use Period 2 and set days Saturday and Sunday to ON with the desired Occupied On and Off times.
NOTE: By default, the time schedule periods are programmed for 24 hours of occupied operation.
To create a schedule, perform the following procedure:
1. Scroll to the Configuration mode, and select CCN CONFIGURATION (CCN). Scroll down to the Schedule Number (Configuration→CCN→SCH.O=SCH.N). If password protection has been enabled, the user will be prompted to enter the password before any new data is accepted. SCH.N has a range of 0 to 99. The default value is 1. A value of 0 is always occupied, and the unit will control to its occupied set points. A value of 1 means the unit will follow a local schedule, and a value of 65 to 99 means it will follow a CCN schedule. Schedules 2−64 are not used as the control only supports one internal/local schedule. If one of the 2−64 schedules is configured, then the control will force the number back to 1. Make sure the value is set to 1 to use a local schedule.
2. Enter the Time Clock mode. Scroll down to the LOCAL TIME SCHEDULE (SCH.L) sub−mode, and press ENTER. Period 1 (PER.1) will be displayed.
3. Scroll down to the MON.1 point. This point indicates if schedule 1 applies to Monday. Use the ENTER command to go into Edit mode, and use the Up or Down key to change the display to YES or NO. Scroll down through the rest of the days and apply schedule 1 where desired. The schedule can also be applied to a holiday.
4. Configure the beginning of the occupied time period for Period 1 (OCC). Press ENTER to go into Edit mode, and the first two digits of the 00.00 will start flashing. Use the Up or Down key to display the correct value for hours, in 24−hour (military) time. Press ENTER and hour value is saved and the minutes digits will start flashing. Use the same procedure to display and save the desired minutes value.
5. Configure the unoccupied time for period 1 (UNC). Press ENTER to go into Edit mode, and the first two digits of the
00.00 will start flashing. Use the Up or Down key to display the correct value for hours, in 24−hour (military) time. Press ENTER and hour value is saved and the minutes digits will start flashing. Use the same procedure to display and save the desired minutes value.
6. The first schedule is now complete. If a second schedule is needed, such as for weekends or holidays, scroll down and repeat the entire procedure for period 2 (PER.2). If additional schedules are needed, repeat the process for as many as are needed. Eight schedules are provided. See Table 3 for an example of setting the schedule.
10
Table 3 – Setting an Occupied Time Schedule — Weekdays Only for 7:30 to 22:30
DISPLAY
MENU
TIMECLOCK
SCH.L
SUB‐SUB
MODE
PER.1
KEYPAD
ENTRY
ENTER
ENTER
ENTER
ENTER
ENTER
ENTER
ESCAPE
ENTER
ENTER
ENTER
ENTER
ESCAPE
ENTER
ENTER
ESCAPE
ENTER
ENTER
ESCAPE
ENTER
ENTER
ESCAPE
ENTER
ENTER
ESCAPE
ENTER
ENTER
ESCAPE
ESCAPE
ESCAPE
ITEM DISPLAY ITEM EXPANSION COMMENT
Local Occupancy Schedule
OCC.1 Period Occupied Time
00.00
00.00
07.00
07.00
07.30
07.30
OCC.1 07.30 Period Occupied Time
UNC.1 00.00 Period Unoccupied Time
00.00
00.00
22.00
22.00
22.30
22.30
UNC.1 22.30 Period Unoccupied Time
MON.1 NO Monday In Period
NO
YES
YES
MON.1 YES Monday In Period
TUE.1 NO Tuesday In Period
NO
YES
YES
TUE.1 YES Tuesday In Period
WED.1 NO Wednesday In Period
NO
YES
YES
WED.1 YES Wednesday In Period
THU.1 NO Thursday In Period
NO
YES
YES
THU.1 YES Thursday In Period
FRI.1 NO Friday In Period
NO
YES
YES
FRI.1 YES Friday In Period
Scrolling stops
Hours Flash
Select 7
Change accepted, minutes flash
Select 30
Change accepted
Item/Value/Units scrolls again
Scrolling stops
Hours Flash
Select 22
Change accepted, minutes flash
Select 30
Change accepted
Item/Value/Units scrolls again
Scrolling stops
Select YES
Change accepted
Item/Value/Units scrolls again
Scrolling stops
Select YES
Change accepted
Item/Value/Units scrolls again
Scrolling stops
Select YES
Change accepted
Item/Value/Units scrolls again
Scrolling stops
Select YES
Change accepted
Item/Value/Units scrolls again
Scrolling stops
Select YES
Change accepted
Item/Value/Units scrolls again
48/50PG and PM
11
The Service Test function can be used to verify proper operation of compressors, heating stages, Humidi−MiZer System, indoor fan, outdoor fans, power exhaust fans, economizer, crankcase heaters, and the alarm relay. Use of Service Test is recommended at initial system start up and during troubleshooting (See Table 4 for point details).
Service Test mode has the following changes from normal operation:
Outdoor air temperature limits for cooling circuits, economizer,
and heating are ignored. Normal compressor time guards and other staging delays are reduced to 30 seconds or less.
Circuit alerts are limited to 1 strike (versus 3) before changing to
alarm shut down state.
The status of ALM.N is ignored so all alerts and alarms are
broadcast on CCN.
The words “SERVICE TEST” are inserted into every alarm
message.
Service test can only be turned ON/OFF at the unit display. Once turned ON, other entries may be made with the display or through CCN. To turn Service Test on, change the value of TEST to ON. To turn service test off, change the value of TEST to OFF.
48/50PG and PM
NOTE: Service Test mode may be password protected. Refer to Basic Control Usage section for more information. Depending on the unit model, factory−installed options, and field−installed accessories, some of the Service Test functions may not apply.
Independent Outputs
The independent (INDP) submenu is used to change output status for the economizer, power exhaust stages, crankcase heaters, alarm relay, and outside air unit.. These independent outputs can operate simultaneously with other Service Test modes. All outputs return to normal operation when Service Test is turned off. When the economizer is using the factory default Digital Control Type (Configuration→ECON→E.CTL is 1 or 2) then the Economizer Calibration feature may be used to automatically check and reset the economizer actuator range of motion. Refer to the economizer operation section of more details. On EnergyX equipped units, use the outside air unit (OAU) points to test the ERV components.
Fan Test
The fans (FANS) submenu is used to change output status for the indoor fan and outdoor fan stages. Indoor fan speed test (F.SPD) is only available for use when adaptive fan is configured (Configuration→A.FAN→AF.EN) for Yes. F.SPD runs the fan at the desired speed entered. Units with Humidi−MiZer systems have limited or no manual outdoor fan control from test mode.
Cooling Test
When charging unit, all outdoor fans may be forced on in cooling service test modes by setting the Outdoor Fan Override (OF.OV) to on.
NOTE: Circuit A is always operated with Circuit B and/or C in Humidi-MiZer system equipped units.
SERVICE TEST
Humidi−MiZert Test
For units with the factory Humidi-MiZer option, the Humidi-MiZer (HZMR) submenu is used to change the output status to operate the circuits in different Humidi−MiZer modes or to separately test the Humidi−MiZer valve operations. Refer to the Humidi-MiZer operation section for details on these modes and valves. The fans (FANS), cooling (COOL), and heating (HEAT) service test outputs are reset to OFF for the Humdi−MiZer service test. Indoor and outdoor fans are controlled normally to maintain proper unit operation. If adaptive fan is configured, then the indoor fan speed will default to the Reheat2 Fan Speed configuration point (Configuration→A.FAN→FS.RH) when Reheat2 test is turned on. The Reheat2 fan speed (F.SPD) only reflects the speed setting for testing Reheat2 circuits, and can only be changed when a circuit is in Reheat2. Actual speed may be different if Reheat 1 tests are being performed. All normal cooling alarms and alerts are functional. Refer to the Humidi−MiZer operating section for more information.
NOTE: Circuit A is always operated with Circuit B and/or C in Humidi-MiZer system equipped units.
Table 4 – Service Test Modes and Submodes Directory
DISPLAY MENU/ SUB-MENU/ NAME SERVICE TEST
TEST Field Service Test Mode Off/On
INDP Test Independent Outputs
ECON Economizer Position Test 0 to 100 E.CAL Calibrate Economizer Off/On PE.1 Power Exhaust 1 Test Off/On PE.2 Power Exhaust 2 Test Off/On ALRM Alarm Relay Test Off/On CCH Crankcase Heat Test Off/On OA.DM OAU 2position Damper Close/Open WHL OAU Wheel Test 0 to 100 OA.OF OAU OA Fan Speed Test 0 to100 OA.XF OAU PE Fan Speed Test 0 to100 OA.HT OAU Tempring Heater Test 0 to 100
FANS Test Fans
IDF Indoor Fan Power Test Off/On F.SPD Indoor Fan Speed Test 0 to 100 OFC.1 Outdoor Fan 1 Test Off/On OFC.2 Outdoor Fan 2 Test Off/On OFC.3 Outdoor Fan 3 Test Off/On
COOL Test Cooling
CMP.A Cool A Test Off/On CMP.B Cool B Test Off/On CMP.C Cool C Test Off/On F.SPD Reduced Cool Fan Speed 60 to 100 OF.OV Outdoor Fan Override Off/On
HMZR Test Humidi-MiZer
RH1.A Reheat1 A Test Off/On RH1.B Reheat1 B Test Off/On RH1.C Reheat1 C Test Off/On RH2.A Reheat2 A Test Off/On RH2.B Reheat2 B Test Off/On RH2.C Reheat2 C Test Off/On F.SPD Reheat2 Fan Speed 65 to 100 CRC Cool>Reheat1 Valve Test Off/On RHV.A Reheat2 Valve A Test Off/On RHV.B Reheat2 Valve B,C Test Off/On
HEAT Test Heating
HT.1 Heat Stage 1 Test Off/On HT.2 Heat Stage 2 Test Off/On F.SPD Reduced Heat Fan Speed 65 to 100
EXPANDED NAME VALUES
12
Heating Test
The heating (HEAT) submenu is used to change output status for the individual heat stages, gas or electric. The fans (FANS) and cooling (COOL) service test outputs are reset to OFF for the heating service test. Indoor and outdoor fans are controlled normally to maintain proper unit operation. If adaptive fan is configured, then the indoor fan speed will default to the heating configuration point (Configuration→A.FAN→FS.HT) when a stage of heat is turned on. The Reduced Heat Fan Speed (F.SPD) can only be changed while one stage is running. If more then one stage is on the actual fan speed will be 100%. F.SPD shows the reduced speed not actual speed. On single stage units actual fan speed will be 100% when that stage is turned on. All normal heating alarms and alerts are functional.
NOTE: Field terminal strip terminal R must be connected to W1 for the heat to operate in service test. Alert number T410 will occur as a reminder if not done. If the normal unit control mode is thermostat mode, then remove the R−W1 jumper after completing service test.
THIRD PARTY CONTROL
Third party controls may interface with the unit ComfortLink controls through the connections described below. See other sections of these instructions for more information on the related unit control and configurations.
Cooling/Heating Control
The thermostat inputs are provided on the field connection terminal board. The Unit Control Type configuration, Configuration→UNIT→U.CTL, must be 2 to recognize the below inputs. Terminal R is the 24vac source for the following:
Y1 = First stage coolingY2 = Second stage coolingW1 = First stage heatingW2 = Second stage heatingG = Indoor fan
Dehumidification Control
On Humidi−MiZer units terminals Humidistat 1 and 2 are provided on the field connection terminal board. Humidity Switch configuration, Configuration→UNIT→RH.SW, identifies the normally open or normally closed status of this input at LOW humidity. The Humidistat 1 terminal is the input signal and R can be used as the source.
NOTE: Dehumidification is considered a cooling function in the software and is only available on Humidi-MiZer equipped units.
Remote Occupancy
The remote occupancy input is provided on the field connection terminal board (TB1). The Remote Occupancy Switch configuration, Configuration→UNIT→RM.SW, identifies the normally open or normally closed status of this input when unoccupied.
5 = 24 VAC signal input6 = 24 VAC source for dry contact
Fire Shutdown
The fire shutdown input is provided for unit shutdown in response to a fire alarm or smoke detector. The Fire Shutdown Switch configuration, Configuration→UNIT→FS.SW, identifies the normally open or normally closed status of this input when there is no fire alarm.
For 48/50 units without Humidi-MiZer system, input at field connection terminal board (TB1)
Fire Shutdown 1 = 24 VAC source for dry contactFire Shutdown 2 = 24 VAC signal input
For 50 series units with Humidi-MiZer system, input at wire harness plug 19 (PL 19). (See Fig. 7.)
PL 19-3 = 24 VAC source for dry contactPL 19-5 = 24 VAC signal input
For 48 series units with Humidi-MiZer system, input at wire harness plug 19 (PL 19). (See Fig. 8.)
PL 19-3 = 24 VAC source for dry contactPL 19-5 = 24 VAC signal for Fire ShutdownPL 19-4 = 24 VAC power for indoor fan contactor control
circuit
NOTE: If the indoor fan must be shut down without any delay upon Fire Shutdown input, then the factory jumper between PL19-3 and PL19-4 must be replaced with a normally closed contact when there is no alarm (open with alarm).
The plug PL19 is located in the return air section on 48/50PG03−14 size units and under the control box on and 48/50PM16−28 units.
Alarm Output
The alarm output is provided on the field connection terminal board (TB1) to indicate a current alarm status. The output will be 24VAC if a current alarm exists.
C = 24 VAC commonX = 24 VAC signal output
C08580
Fig. 7 − 50PG/PM Humidi−MiZert − Third Party Smoke
Detector Wiring
48/50PG and PM
13
FS.SW = 1 (NO)
Fig. 8 − 48PG/PM Humidi−MiZert − Third Party Smoke Detector Wiring
FS.SW = 2 (NC)
C09346
Economizer Monitoring
48/50PG and PM
On field terminal board (TB1), terminals 8, 9, and 10 can be used to monitor economizer position from a third party control system. See economizer operation section for additional information.
NOTE: Terminal 8 will not represent economizer position if the unit is equipped with Adaptive Fan.
In digital mode (E.CTL = 1 or 2), the economizer commanded position can be read as a 2−10v or 4−20mA signal. TB1−8 and TB1−9 are used as follows:
To read a 2−10v signal, disconnect the violet wire on
TB1−J10−8 and place volt meter device across TB1−8 and
TB1−9.
To read a 4−20mA signal, disconnect the violet wire on
TB1−J10−8 and the 500Ω resister at TB1−J10−6. Place amp
meter device between TB1−8 and TB1−9.
In analog mode (E.CTL = 3), the economizer position can be read as a 2−10v feedback signal across TB1−10 and TB1−9 at any time.
NOTE: The violet wire and 500Ω resister must be connected at the J10 connector as originally wired to operate the economizer in analog mode.
Economizer Damper Control
For units with the economizer option or accessory and the ECB control board, the damper position can be directly controlled through the IAQ sensor input provided on the field connection terminal board. The IAQ Analog Input configuration, Configuration→AIR.Q→IA.CF will have to set to 3 (Control Minimum Position). When IA.CF = 3, an external 4 to 20 mA source is used to move the damper 0% to 100% directly.
Terminal 2 = 4−20mA + signal Terminal 3 = 4−20mA − common
NOTE: In this mode, preset minimum positions configurations are not valid, the damper position may exceed the input position to provide economizer cooling and CO for DCV control. Refer to the Indoor Air Quality operation section for more information.
sensor input can not be used
2
CONTROLS OPERATION
Display Configuration
The Configuration→DISP submenu is used to configure the local display settings.
Metric Display (METR)
This variable is used to change the display from English units to Metric units.
Language Selection (LANG)
This variable is used to change the language of the ComfortLink display. At this time, only English is available.
Password Enable (PROT)
This variable enables or disables the use of a password. The password is used to restrict use of the control to change configurations.
Service Password (PSWD)
This variable is the 4-digit numeric password that is required if enabled.
Test Display LEDs (TEST)
This is used to test the operation of the ComfortLink display.
Unit Configuration
Many configurations that indicate what factory options and/or field accessories are installed and other common operation variables are included in Unit Configuration (Configuration→UNIT). These configurations will be set in the factory for the factory−installed options (FIOPs). Field−installed accessories installed will require configuration changes. General unit and fan control configurations are also covered under this Unit Configuration menu.
Start−Up Delay (S.DLY)
This configuration sets the control start-up delay after the power is interrupted. This can be used to stagger the start-up of multiple units.
Unit Control Type (U.CTL)
U.CTL = 2 (Thermostat) – The unit determines cooling and
heating demand by the state of G, Y1, Y2, W1, and W2 inputs from a space thermostat. This value is the factory default.
U.CTL = 3 (Space Sensor) – The unit determines cooling and
heating demand based on the space temperature and the appropriate set point. Used also as Linkage configuration. The jumper wire in the installer’s packet must be connected between R and W1 on the low voltage terminal board (TB) for heating mode to operate.
14
Thermostat Control Type (T.CTL)
This configuration applies only if Unit Control Type is Thermostat (Configuration→Unit→U.CTL = 2). The value determines alternative cooling and Humidi-MiZer circuit staging. See the Cooling and Humidi-MiZer sections for more information. The factory default value is T.CTL = 0 (Adaptive).
Fan On When Occupied (OC.FN)
This configuration applies only if Unit Control Type is Space Sensor (Configuration →Unit→U.CTL = 3). A YES value will operate the indoor fan whenever the unit is in the Occupied mode. A NO value will operate the indoor fan only when heating or cooling is necessary. The factory default value is YES.
Shut Down on IDF Failure (IDF.F)
This configuration applies only if a fan switch is installed and configured. A YES value will enable diagnostic Alert T409 to shut down the unit when incorrect fan status is sensed. A NO value will still permit Alert T409 but will not cause unit shutdown. The factory default value is YES.
Fan Status Switch (FN.SW)
This configuration identifies if a fan status switch is installed, and what status (normally open, normally closed) the input is when the indoor fan is OFF.
Filter Status Switch (FL.SW)
This configuration identifies if a filter status switch is installed, and what status (normally open, normally closed) the input is when the filter is CLEAN.
Fire Shutdown Switch (FS.SW)
This configuration identifies if a fire shutdown switch is installed, and what status (normally open, normally closed) the input is when the fire or smoke alarm is OFF (no alarm).
Remote Occupancy Switch (RM.SW)
SAT Settling Time (SAT.T)
This configuration sets the settling time of the supply air temperature (SAT). This tells the control how long to wait after a stage change before trusting the SAT reading. See Adaptive Thermostat Control (U.CTL = 2, T.CTL = 0) and Space Sensor Control (U.CTL = 3) within the Cooling operation section for more information. The factory default value is 240 seconds.
RAT Sensor On SPTO Input (RAT.S)
This configuration identifies if a return air temperature (RAT) sensor is installed on the space temperature offset (SPTO) input. A YES value enables RAT display. A NO value disables RAT display. Installing an RAT sensor will allow economizer differential dry bulb control. Refer to the economizer operation for more information.
RH Sensor On OAQ Input (RH.S)
This configuration identifies if a space relative humidity sensor is installed on the outdoor air quality (OAQ) input. A YES value enables SP.RH display. If a Humdi-MiZer unit, then the unit determines dehumidification demand based on this input and the appropriate set point. A NO value disables SP.RH display and use.
Space Humidity Switch (RH.SW)
This configuration identifies if a space relative humidity switch is installed on the ENTHALPY input, and what status (normally open, normally closed) the input is when the space humidity is LOW.
Temperature Compensated Start Cooling Factor (TCS.C)
This factor is used in the equation of the Temperature Compensated Start Time Bias for cooling. A setting of 0 minutes indicates Temperature Compensated Start in Cooling is not permitted.
Temperature Compensated Start Heating Factor (TCS.H)
This factor is used in the equation of the Temperature Compensated Start Time Bias for heating. A setting of 0 minutes indicates Temperature Compensated Start in Heating is not permitted.
Modes
The ComfortLink controls operate under a hierarchy of command structure as defined by four main elements: the System Mode, the HVAC Mode, the Occupied status, and the Unit Control Type.
The System Mode is the top level that defines three main states of the control system: Disabled, Enabled, or Test.
The HVAC Mode is the next level that defines four main states of functional operation: Disabled, Fan Only, Cool, and Heat.
The Occupied status affects set points for cooling and heating in Space Sensor control mode and operation of the economizer for indoor air quality ventilation and free cooling.
The Unit Control Type (Configuration→UNIT→U.CTL) defines if temperature control is based on thermostat inputs or space temperature sensor input.
The general operating mode of the control and the status of some related operation lockouts are located on the display at two locations: Run Status→ MODE and Operating Modes→ MODE.
System Mode (SYS)
In Run Status and Operating Modes, the current system mode is displayed with expandable text. This is an overall state of the unit. Three states are: Unit Operation Disabled, Unit Operation Enabled, or Service Test Enabled.
HVAC Mode (HVAC)
In Run Status and Operating Modes, the current allowed HVAC mode is displayed with expandable text. This is the mode the unit decides to run in based on its inputs. There are four main HVAC modes; cooling has six different expanded texts. These modes are shown below.
HVAC Mode
Disabled HVAC Operation
Fan Only Ventilation (fan-
Cooling
Heating Heating Heating mode
Expanded Text Brief Description
Disabled
only) Cooling Mechanical cooling Free Cooling Only economizer used for cooling Unoccupied Free
Cooling Reheat1 All running circuits in sub-cooling
Reheat2 All running circuits in Hot Gas Reheat
Reheat1/Reheat2 Sub-cooling and Hot Gas Reheat
Unit is in test mode or System mode is disabled
Fan may run for ventilation
Only economizer use for cooling (occupied cooling set point active)
mode
mode
active
48/50PG and PM
15
HVAC Operation Disabled (HV.DN)
Allow disabling of HVAC mode. This is only available on a network connection and shows if the unit has been forced into the disabled status.
Cool Setpoint In Effect (EFF.C)
This shows the actual setpoint that is being used for control during cooling mode. If a 0 is displayed, then space sensor control is not being used and the unit is being controlled by a thermostat.
Heat Setpoint In Effect (EFF.H)
This shows the actual setpoint that is being used for control during heating mode. If a 0 is displayed, then space sensor control is not being used and the unit is being controlled by a thermostat.
Currently Occupied (OCC)
Displays the current state of assumed space occupancy based on unit configuration and inputs.
Timed Override in Effect (T.OVR)
Displays if the state of occupancy is currently occupied due to an override.
Linkage Active (LINK)
Displays if a linkage communication “Linkage” is established
48/50PG and PM
between the unit and a linkage source.
Demand Limit in Effect (D.LMT)
Displays if a demand limit has been placed on the unit’s capacity.
Compressor OAT Lockout (C.LOC)
Displays if operation of one or more compressors is prevented due to outdoor temperature limit lockout.
Heat OAT Lockout (H.LOC)
Displays if heating operation is prevented due to outdoor temperature limit lockout.
Econo Cool OAT Lockout (E.LOC)
Displays if economizer operation for cooling is prevented due to outdoor temperature limit lockout.
General Operation
48/50PG and 48/50PM units can provide cooling, dehumidification, heating, and ventilation operation. Each unit will operate under one of two basic types of control: thermostat or space temperature sensor. There are many inputs, configurations, safety factors, and conditions that ultimately control the unit. Refer to the specific operation sections for detail on a specific unit operation.
When thermostat control is enabled (Configuration→UNIT →U.CTL = 1), the unit will operate based on discrete input commands (G, Y1, Y2, W1, and W2) and there is a one minute time delay between modes and when re−entering a mode. The G command calls for ventilation, the Y1 and Y2 commands call for cooling, and the W1 and W2 commands call for heating. Thermostat Control Type (Configuration→UNIT→T.CTL) affects how cooling operates based on Y1 and Y2 commands and if cooling/heating stage time guards are applied.
When space temperature sensor control is enabled (Configuration →UNIT→U.CTL = 2), the unit will try to maintain the Space Temperature (Temperatures→AIR.T→SPT) between the effective cool and heat setpoints (Run Status→MODE→EFF.C and EFF.H). However, to minimize unnecessary cool to heat and heat to cool changes, there is a 10 minute delay after the last stage turns off before the control will switch modes and a 1 minute delay when re−entering the last mode. Linkage operation overrides the mode changeover delay to 15 seconds. The cooling and heating Mode Select Timeguard (Operating Modes→COOL→MS.TG and Operating Modes→HEAT→MS.TG) show the remaining time before allowing the respective mode to be entered.
Temperature Setpoint Determination
If the building is in occupied mode, the Occupied Cool Setpoint (Setpoints→OCSP) and the Occupied Heat Setpoint (Setpoints →OHSP) are active. When the building is in unoccupied mode, the Unoccupied Cool Setpoint (Setpoints→UCSP) and the Unoccupied Heat Setpoint (Setpoints→UHSP) are active. The heating and cooling set points are also separated by a Heat−Cool Set Point Gap (Setpoints→GAP) that is user configurable from 2 to 10 degrees F. This parameter will not allow the setpoints to be set too close together, it will change the last setpoint adjusted if it is set within the GAP.
When the space sensor has a setpoint slider adjustment, the cool and heat setpoints (occupied) can be offset by sliding the bar from one side to the other. The SPT Offset Range (+/−) (Setpoints →STO.R) sets the total positive or negative degrees that can be added to the setpoints. With the slider in the middle, no offset is applied. Moving the slider to the “COOL” side will subtract from each setpoint, and sliding it to the “WARM” side will add to the setpoints. The slider offset being applied at any given time is displayed as Space Temperature Offset (Temperatures→AIR.T →SPTO).
16
Occupancy Determination
The building’s occupancy is affected by a number of different factors. When the unit is operating with a space temperature sensor (T−55, T−56, T−58 or T−59), occupancy affects the unit set points and the operation of the economizer. If the unit is operating under thermostat control, occupancy only affects the operation of the economizer. If the unit’s Humidi−MiZer is being controlled by a relative humidity sensor, then occupancy will affect the RH setpoints. The factors affecting occupancy are listed below from highest to lowest priority.
Level 1 Priority
Level 1 classification is a force/write to occupancy and can occur three ways. Listed in order of priority: force on OCCUPIED, a write to NVI_OCC, and a Linkage write. The CCN point OCCUPIED is forced via an external device such as a ComfortID controller or a service tool. When OCCUPIED is forced to YES, the unit is considered occupied, when OCCUPIED is forced to NO, the unit is considered unoccupied. If the 3rd party protocol LON is writing to NVI_OCC, the control maps it to OCCUPIED as an input. If the unit is being controlled by Linkage, the occupancy is communicated and mapped to OCCUPIED as an input. LON and Linkage do not force the point, only write to it, therefore a force applied to OCCUPIED will override them.
If OCCUPIED is not being forced or written to, proceed to the level 2 priority.
Level 2 Priority
Remote Occupancy Switch should be configured to either Normally Open or Normally Closed when the user would like to control the occupancy with an external switch. This switch is field−supplied (24v, single pole, single throw [SPST]). There are three possible configurations for the remote occupancy switch:
1. (Configuration→UNIT→RM.SW = 0) No Switch
2. (Configuration→UNIT→RM.SW = 1) Normally Open
Switch
3. (Configuration→UNIT→RM.SW = 2) Normally Closed
Switch
If the switch is configured to No Switch (0), the switch input value will be ignored and software will proceed to level 3 priority. For each type of switch, the appropriate configuration and states are listed in the table below. The Remote Occupancy Switch (INPUTS→GEN.I→RM.OC) point will show the status of the switch.
TYPE OF SWITCH
Occupied when Closed or Unoccupied when Open
Occupied when Open or Unoccupied when Closed
SWITCH
CONFIGURATION
Normal Open (1)
Normal Closed (2)
NOTE: To perform remote occupancy, an Economizer Control Board must be installed in the unit.
Level 3 Priority
The following occupancy options are determined by the state of Occupancy Schedule Number (Configuration→CCN→SCH.O
→SCH.N) and the Global Schedule Broadcast (Configuration →CCN→ BROD→B.GS).
1. (Configuration→CCN→SCH.O→SCH.N = 0)
The unit is always considered occupied and the programmed schedule is ignored. This is the factory default.
2. (Configuration→CCN→SCH.O→SCH.N = 1−64)
Follow the local programmed schedule. Schedules 1 to 64 are local within the controller. The unit can only store one
STATE OF SWITCH
AND STATE OF
OCCUPANCY
Open and Unoccupied
Closed and Occupied
Open and Occupied
Closed and Unoccupied
local schedule and therefore changing this number only changes the title of the schedule table.
3. (Configuration→CCN→SCH.O→SCH.N = 65−99) Follow the global programmed schedule. If the unit is configured as a Global Schedule Broadcaster (Configuration→CCN→BROD→B.GS = YES), the unit will follow the unit’s programmed schedule and broadcast the schedule so that other devices programmed to follow this schedule number can receive the schedule. If the unit is not programmed as a Global Schedule Broadcaster (Configuration→CCN→BROD→B.GS = NO), the unit will receive broadcasted schedules from a unit programmed to broadcast this schedule number. While using the programmed schedule, occupancy can be temporarily switched from unoccupied to occupied by pressing the override button for approximately 3 seconds on the T−55, T−56, T−58 or T−59 space temperature sensor. Override will only occur if SPT Override Enabled (Configuration →CCN→SCH.O→OV.SP) is set to YES. The length of the override period when pressing the override button is determined by the Override Time Limit (Configuration →CCN→SCH.O→OV.TL). The hours remaining in override is displayed as Timed Override Hours (Configuration→CCN→SCH.O→OV.EX). This point can also be changed from the local display or network to set or change the override period length.
Indoor Fan Operation
The indoor fan is controlled by the Indoor Fan Relay (Outputs →FANS→IDF) on the MBB (main base board) control, which then operates the indoor fan contactor (IFC). For gas heating units, the IGC control fan output is also monitored by the MBB control. This can result in additional modification of fan delays or other operation due to safety functions of the IGC control. The Humidi−MiZer gas heating units do not monitor the IGC fan output; instead an indoor fan on relay (IFOR) is used to allow the IGC to turn the fan on. If configured for IAQ fan operation, the fan may be turned on to satisfy air quality demands. See the Indoor Air Quality section if using IAQ (indoor air quality) accessory sensors. The fan can only be turned on under thermostat or space sensor control if the System Mode (SYS) status is enabled. The fan will remain on if compressors or heat relays are ever stuck on. If configured for fan status switch (FN.SW) and Shut Down on IDF Failure (Configuration→UNIT→IDF.F = Yes) is enabled, the fan and unit will be shutdown on alarm. See the Adaptive Fan section for information on its operation.
Thermostat Control
→HEAT→FOD.E), and Gas Heat (Configuration→HEAT →FOD.G).
Space Sensor Control
In Space Sensor mode, the IDF relay will be on if the unit is in Occupied mode and the indoor fan is configured to always run while occupied (Configuration→UNIT→OC.FN = YES). If the indoor fan is configured for intermittent fan (Configuration →UNIT→OC.FN = No), the fan will only be on when there are cooling, heating, or dehumidification stages running; or if there is an air quality demand. During the unoccupied period, the fan will operate intermittent. With intermittent fan, the IDF relay will turn off after a configurable time delay with respect to the HVAC mode that is ending. The Fan−off Delay delays are as follows: Mech Cool (Configuration→COOL →FOD.C), Elect Heat (Configuration→HEAT→FOD.E), and Gas Heat (Configuration→HEAT→FOD.G).
48/50PG and PM
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Cooling Operation
The 48/50PG and 48/50PM unit’s cooling operation consists of: demand, mode determination, staging request to satisfy the demand, and handling a request with the unit’s resources. These resources can include compressors, an economizer, and a reheat coil. This section covers mechanical cooling. For economizer and reheat cooling, refer to the Economizer and Humidi−mizer sections, respectively. The unit enters a cooling mode based on a demand, decides how to satisfy the demand, executes its plan, and then leaves the cooling mode.
Cooling Mode Control
The cooling HVAC mode (Run Status→MODE→HVAC=3) has six different expandable texts: Cooling, Free Cooling, Unoccupied Free Cooling, Reheat1, Reheat2, or Reheat1/Reheat2. These are all part of a general cooling mode and resemble the specific type of cooling that is being performed at any given time. All types of cooling are still performed under the general cooling function, and the expanded text is for user reference only. The control will display if it is ok to select the cooling mode (Operating Modes →COOL→OK.CL= Yes).
Thermostat Control
For the unit to enter cooling mode, three things must be true: the
48/50PG and PM
indoor fan must be ok to use, the mode changeover time guard must be expired, and there must be a cooling demand (Y1, Y2, or reheat demand). The unit will remain in cooling until the cooling demand is dropped or if any of the above conditions turn false. If only a reheat demand exists and a heat demand (W1, W2) occurs, the unit will end cooling. The cooling mode can not officially end until all compressors are off.
Space Sensor Control
For the unit to enter cooling mode, four things must be true: the indoor fan must be ok to use, the mode changeover time guard must be expired, the unit must have a valid space temperature, and there must be a cooling or reheat demand. The unit will remain in cooling for at least one minute and until the cooling demand drops below −0.5F or if any of the above conditions turn false. If only a reheat demand exists and the heat demand becomes greater than the Reheat Heat Setpoint Deadband (Setpoints→RH.HB), the unit will end cooling. The cooling mode can not officially end until all compressors are off.
Staging Control
Once the unit is in a cooling mode, it must decide what the demand is and how to satisfy it. If an economizer is installed and can be used for cooling (Operating Modes→COOL→OK.EC= Yes), the unit will use it first (see economizer section for its operation). If the economizer can not be used or additional cooling is needed, a mechanical cooling check is performed. OK to use Compressors? (Operating Modes→COOL→OK.MC), will be set to yes when compressors are enabled and not locked out. Based on the unit control configuration, requested cooling stages (Run Status →COOL→REQ.C) will be determined then passed to compressor control to actually add the cooling stages.
Thermostat Control
There are two ways of requesting stages when thermostat control is enabled, Traditional Thermostat control or Adaptive control. Traditional Thermostat control is used if the Thermostat Control Type (T.CTL) is set to 1, 2, or 3 and the economizer is not available for free cooling. If Thermostat Control (T.CTL) is set to 0 or any time the economizer is available for free cooling, the unit will use Adaptive control for staging.
T.CTL = 0 (Adaptive Control)
Stage timers, Supply air trend, and supply air temperature limits apply when determining the request for stages. The first request (REQ.C=1) comes immediately when the Y1 input is active. The Cool Stage Increase Time (Configuration→COOL→C.INC) or the Cool Stage Decrease Time (Configuration→COOL→C.DEC) has to expire before another stage can be added or a stage can be subtracted. The Supply−Air Trend (Operating Modes→COOL→SA.TR) decides if the next stage can be requested or should be subtracted based on the Y2 input status. For 48/50PG16 units, the supply air trend will allow up to 2 requested stages for just the Y1 input and allow up to 3 requested stages for an Y1 and Y2 input. If the Y1 and Y2 inputs are dropped, the supply air trend is not considered because cooling is no longer needed. If at any time the Supply−Air Temperature (SAT) falls below the Minimum Supply Air Temperature Upper Level (Configuration→COOL→SAT→SAT.U), the requested stages will not be allowed to increase. If at any time the SAT falls below the Minimum Supply Air Temperature Lower Level (Configuration→COOL→SAT→SAT.L), the requested stages will be reduced by one without honoring C.DEC. If SAT.L and SAT.U are configured so that they are close together, the last stage of compressor might cycle rapidly, slowed only by its minimum on and off−time requirements.
T.CTL = 1 (1 Stage Y1)
Stage timers, Supply air trend, and supply air temperature limits do not apply when determining the request for stages. Request staging will follow the thermostat inputs directly. Y1 will request one stage. Y2 will request all stages.
T.CTL = 2 (2 Stage Y1)
Stage timers, Supply air trend, and supply air temperature limits do not apply when determining the request for stages. Request staging will follow the thermostat inputs directly. Y1 will request two stages on 48/50PG16 units and one stage for all other units. Y2 will request all stages.
T.CTL = 3 (Digital)
Stage timers, Supply air trend, and supply air temperature limits do not apply when determining the request for stages. Request staging will follow the thermostat inputs directly. Y1 will request one stage. Y2 will request two stages. Y1 and Y2 will request three stages on 48/50PG16 units and two stages for all other nits.
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Space Sensor Control
Space sensor staging control is an adaptive anticipation control that weighs the actual space demand against the trend of that demand and the trend of the supply air. It also honors stage time guards and supply air limits. The demand for cooling in the space is displayed as the Cooling Demand (Run Status→COOL →DMD.C). The control tries to anticipate the change in the space because of its current stage status. This anticipation is based on the Supply−Air Trend (Operating Modes→COOL→SA.TR) and the Cool Demand Trend (Operating Modes→COOL→TRD.C). These trends will show the control how the space is reacting to the current running conditions and help it decide when to add or remove one stage from the requested stages. The Cool Stage Increase Time (Configuration→COOL→C.INC) or the Cool Stage Decrease Time (Configuration→COOL→C.DEC) has to expire before another stage can be added or a stage can be subtracted. If at any time the Supply−Air Temperature (SAT) falls below the Minimum Supply Air Temperature Upper Level (Configuration→COOL→SAT→SAT.U), the requested stages will not be allowed to increase. If at any time the SAT falls below the Minimum Supply Air Temperature Lower Level (Configuration→COOL→SAT→SAT.L), the requested stages will be reduced by one without honoring C.DEC. If SAT.L and SAT.U are configured so that they are close together, the last stage of compressor might cycle rapidly, slowed only by its minimum on and off−time requirements.
Compressor Control
The compressor control works hand and hand with the staging control. As the staging control requests stages, the compressor control determines what actual compressors are available or running and tries to provide stages for what is requested. The availability of a compressor depends on time guards, circuit diagnostics, outdoor temperature, and the unit size.
The Number of Circuits (Configuration→COOL→N.CIR) configuration tells the control how many compressors are installed on the unit. The Circuit A Lockout Temp (Configuration→COOL→CIR.A →CA.LO), Circuit B Lockout Temp (Configuration→COOL →CIR.B→CB.LO), and Circuit C Lockout Temp (Configuration →COOL→CIR.C→CC.LO) configurations set the outdoor temperature in which the respective compressor is allowed to run down to. Timeguard A (Run
Status→COOL→CIR.A→TG.A), Timeguard B (Run Status→COOL→CIR.B→TG.B), and Timeguard C (Run Status→COOL→CIR.C→TG.C) display the time a respective
compressor has before it is available for use. Individual circuit diagnostic tests are performed during operation which may or may not allow a compressor to be used. The configuration point Compressors On Circuit A (Configuration →COOL→N.A) informs the control to run diagnostics on one or two compressors for circuit A. The available stages at any given time are displayed as Available Compressors (Run Status→COOL →AVL.C). The actual compressors running at any given time are displayed as Actual Cooling Stages (Operating Modes→COOL →ACT.C). Compressor A (Run Status→COOL→CIR.A →CMP.A), Compressor B (Run Status→COOL→CIR.B →CMP.B), and Compressor C (Run Status→COOL→CIR.C →CMP.C) are displayed on when the respective compressor is running.
There are time guards to protect the compressors. Compressor Min On Time (Configuration→COOL→MRT.C) and Compressor Min Off Time (Configuration→COOL→MOT.C) apply before a compressor can be turned back on or turned off.
Outdoor Fan Control
Each unit has a means for variable outdoor airflow to control condenser pressure control within an acceptable range by responding to varied operating modes and ambient temperatures. This is implemented differently on different units using multi−speed motors, multiple outdoor fans, or variable−speed motor controllers.
NOTE: Factory default configurations account for these model differences and should not be changed. The default configurations have been qualified over a large range of conditions and are provided in case a field replacement of a control board occurs and the settings need to be checked or manually configured. Outdoor fan operation is further described below to assist in troubleshooting.
The outdoor fans are controlled by levels. There are 4 levels of operation (0−3) and the current operating level is shown as Outdoor Fan Level (Operating Modes→COOL→F.LEV). The fan level selected during operation is based on factory configurations of outdoor temperature limits and condenser pressure limits. These are in the Outdoor Fan Control submenu (Configuration→COOL→OFC) and shown in Table 5. The starting level is picked after a compressor is turned on and is based on the Outdoor Air Temperature (Temperatures→AIR.T→OAT). A circuit’s Saturated Condensing Temperature (Temperatures →REF.T→SCT.x) can override the fan level at any time if the specific Fan Level Max Pressure (Configuration→COOL→OFC →x.MXP) is exceeded. This override will end if the circuit’s saturated condensing temperature (SCT) drops below the specific Fan Level Min Pressure (Configuration→COOL→OFC →x.MNP). The number of fans and contactors on at a given fan level depends on the specific unit options and size. See Tables 6 and 7 and below text for specific fan and contactor status at any given fan level.
Units Without Humidi−MiZert System
Units With Humidi−MiZer System
Outdoor fan control for Humidi−MiZer units includes a Motormaster variable−speed control of some or all outdoor fans, depending on unit size. The Motormaster control automatically adjusts the outdoor fan speed to maintain approximately 80 to 100F condenser temperature for circuit A at all outdoor ambient temperatures. Some unit sizes have additional on/off staging of some outdoor fans. The fan level operation is determined by some or all Outdoor Fan Control configurations described above, plus additional Humidi−MiZer Configuration (Configuration →HZMR). Refer to the Humidi−MiZer operation section for details on the Reheat function fan control.
48/50PG and PM
19
For 48/50PG03−07 units, one outdoor fan is controlled in all modes by the Motormaster sensing on circuit A. For 48/50PG08−14 units, 2 outdoor fans are controlled in all modes by the Motormaster sensing on circuit A.
For 48/50PG16 units, 3 outdoor fans are controlled in normal cooling and sub−cooling Reheat1 modes by the Motormaster sensing circuit A. Two of the fans are additionally controlled with OFC.1 output, based on outdoor temperature, during the hot−gas Reheat2 mode (level 1 = 1 fan, level 2 = 3 fans).
Table 5 – Outdoor Fan Level Transitions
For 48/50PG20−28 and 48/50PM16−28 units, contactor OFC1 controls power to the Motormaster which controls OFM1 and OFM4. Contactor OFC2 controls the remaining two fans (16 and 20 size) or remaining 4 fans (24 and 28 sizes).
FAN LEVEL
NOTE: Where not specified, the models are both PG and PM. Levels 0 and 1 are only in play if the OAT is lower than the Level 2 On temperature and the pressure is not above its respected max.
48/50PG and PM
FAN LEVEL
0 OFF OFF OFF OFF OFF OFF
1
2
3 N/A N/A N/A N/A N/A N/A
FAN LEVEL
0 - - -
1
2
3
OUTDOOR TEMPERATURE (F)
Without Humidi-MiZer™ System With Humidi-MiZer System
Level 2 On 55 (sizes 03-20), 45 (sizes 24-28) 61 (PG03-16, sizes 24-28), 68 (size 20, PM16)
Level 2 Off 45 (PG03-16), 50 (size 20, PM16), 40 (sizes 24-28) 57
Level 3 On 65 68 (PG03-16, size 24-28), 88 (size 20, PM16)
Level 3 Off 55 62 (PG03-16, size 24-28), 78 (size 20, PM16)
Table 6 – 48/50PG03−16 Fan Level Control of Fans and Contactors
48/50PG03-07 48/50PG08-14 48/50PG16
Standard Unit Humidi-MiZer Unit Standard Unit Humidi-MiZer Unit Standard Unit Humidi-Mizer Unit
OFC1 On
Low Speed
OFC1 Off
High Speed
Motormaster
Fan 1
N/A
OFC1 On,
OFC2 Off Fan 1 On
OFC1 On,
OFC2 On
Fan 1 and 2 On
Motormaster
Fan 1 and Fan 2
N/A
OFC1 On,
OFC2 Off Fan 1 On
OFC1 On,
OFC2 On
Fan 1, 2, 3 On
Motormaster, OFC1
Off
Fan 2
Motormaster, OFC1
On
Fan 1, 2, 3
Table 7 – 48/50PG20−28 and PM16−28 Fan Level Control of Outdoor Fan contactors (OFC(X))
With Humidi-MiZer System With Humidi-MiZer System
Circuit A Circuit B Circuit A and B
1
1, 3 (PG28)
1,2 (20, PM16)
2 (24-28)
1,2
1, 2, 3 (PG28)
3 1
2, 3 (20, PM16)
2 (24-28)
2, 3 1, 2
1, 2 (20, PM16)
2 (24-28)
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Heating Operation
The 48/50PG and 48/50PM unit’s heating operation consists of: demand, mode determination, staging request to satisfy the demand, and handling a request with the unit’s resources. These resources can be gas heat or electric heat. This section covers both gas heat units and electric heat units. The Type of Heat Installed (Configuration→HEAT→HT.TY) configuration will be factory set to 1 for gas units, 2 for electric heat units with heaters installed, and 0 for electric heat units without heat installed. The unit enters a heating mode based on a demand, decides how to satisfy the demand, executes its plan, and then leaves the heating mode.
Heating Mode Control
The heating HVAC mode (Run Status→MODE→HVAC=4), represents both types of heating (gas or electric) under all types of control. For the unit to be allowed to enter the heat mode, heat must be enabled (HT.TY = 1 or 2), and the Outdoor Air Temperature (Temperatures→AIR.T→OAT) must be less than the Heating Lockout Temp (Configuration→HEAT→HT.LO). Heat OAT Lockout (Run Status→MODE→H.LOC) displays when heat is locked out on outdoor temperature and therefore can not allow heat mode. The control will display if it is ok to select the heating mode (Operating Modes→HEAT →OK.HT= Yes).
Thermostat Control
For the unit to enter heating mode, three additional things must be true: the indoor fan must be ok to use, the mode changeover time guard must be expired, and there must be a heating demand (W1, W2). The unit will remain in heating until the heating demand is dropped or if any of the above conditions turn false. The heating mode can not officially end until all heat stages are off and the IGC fan request is dropped (on gas units without Humidi−MiZer).
Space Sensor Control
For the unit to enter heating mode, five additional things must be true: the indoor fan must be ok to use, the mode changeover time guard must be expired, the unit must have a valid space temperature, the W1 jumper must be installed, and there must be a heating demand. The unit will remain in heating for at least one minute and until the heat demand drops below −0.5F or if any of the above conditions turn false. The heating mode can not officially end until all heat stages are off and the IGC fan request is dropped (on gas units without Humidi−MiZer).
Supply−Air Temperature Sensor (SAT)
The SAT Heat Mode Sensing (Configuration →HEAT→SAT→SAT.H) informs the unit if the supply air sensor has been relocated downstream of the heat section. This configuration affects the Supply Air Temperature (Temperatures →AIR.T→SAT) value displayed as listed below.
When SAT.H = DSBL, the Supply Air Temperature (Temperatures →AIR.T→SAT) value on the Scrolling Marquee and the CCN tables will be forced to zero when heat outputs turn ON or OFF and for 5 minutes after. The default Supply Air Temperature location is at the fan inlet, upstream of the heat section.
When SAT.H = ENBL, the Supply Air Temperature (Temperatures →AIR.T→SAT) sensor reading is displayed at the Scrolling Marquee and the CCN tables during heating mode. This setting should only be used if the original SAT sensor wires are removed from the Main Base Board (MBB) and replaced by an accessory SAT sensor located in the supply duct downstream of the heat section.
There are two supply air temperature limits that affect heating operation, the Maximum SAT Lower Level (Configuration →HEAT→SAT→SAM.L) the Maximum SAT Upper Level (Configuration→HEAT→SAT→SAM.U). Any time the supply air temperature rises above SAM.L the heat staging will be limited to what is currently on and no additional stages can be added until the supply air temperature falls back below SAM.L. If the supply air temperature rises above SAM.U, then heating will be reduced by removing a heat stage. That stage can not be added again until the Supply Air Temperature falls below SAM.L. If the supply air temperature stays above SAM.U, then another stage will be removed after the Heat Stage Decrease Time (Configuration →HEAT→H.DEC). If SAM.L and SAM.U are configured so that they are close together, the last stage of heat might cycle rapidly, slowed only by its minimum on and off−time requirements.
Staging Control
Once the unit is in a heating mode, it must decide what the demand is and how to satisfy. Based on the unit control configuration, requested heating stages (Run Status→HEAT→REQ.H) will be determined then passed to heat control to actually add the heating stages.
Thermostat Control
There are two ways of requesting stages when thermostat control is enabled: Traditional Thermostat control or Adaptive control. Traditional Thermostat control is used if the Thermostat Control Type (T.CTL) is set to 1, 2, or 3. Adaptive control is used if Thermostat Control (T.CTL) is set for 0.
T.CTL = 0 (Adaptive Control)
Stage timers and supply air temperature limits apply when determining the request for stages. The first request (REQ.C=1) comes immediately when the W1 input is active. The Heat Stage Increase Time (Configuration→HEAT→H.INC) or the Heat Stage Decrease Time (Configuration→HEAT→H.DEC) has to expire before another stage can be added or a stage can be subtracted. If at any time the Supply−Air Temperature (SAT) rises above the Maximum Supply Air Temperature Lower Level (Configuration→HEAT→SAT→SAM.L), the requested stages will not be allowed to increase. If at any time the SAT rises above the Maximum Supply Air Temperature Upper Level (Configuration→HEAT→SAT→SAM.U), the requested stages will be reduced by one without honoring H.DEC.
T.CTL = 1, 2 or 3 (Traditional thermostat control)
Stage timers and supply air temperature limits do not apply when determining the request for stages. Request staging will follow the thermostat inputs directly. W1 will request one stage. W2 will request all stages.
48/50PG and PM
21
Space Sensor Control
Space sensor staging control is an adaptive anticipation control that weighs the actual space demand against the trend of that demand. It also honors stage time guards and supply air limits. The demand for heating in the space is displayed as the Heating Demand (Run Status→HEAT→DMD.H). The control tries to anticipate the change in the space because of its current stage status. This anticipation is based on the Heat Demand Trend (Operating Modes →HEAT→TRD.H). This trend will show the control how the space is reacting to the current running conditions and help it decide when to add or remove one stage from the requested stages. The Heat Stage Increase Time (Configuration→HEAT→H.INC) or the Heat Stage Decrease Time (Configuration→HEAT →H.DEC) has to expire before another stage can be added or a stage can be subtracted. If at any time the Supply−Air Temperature (SAT) rises above the Maximum Supply Air Temperature Lower Level (Configuration→HEAT→SAT→SAM.L), the requested stages will not be allowed to increase. If at any time the SAT rises above the Maximum Supply Air Temperature Upper Level (Configuration→HEAT→SAT→SAM.U), the requested stages will be reduced by one without honoring H.DEC.
Heat Relay Control
48/50PG and PM
The heat relay control is responsible for energizing or de−energizing the MBB’s heat stage relays and works hand in hand with the staging control. As the staging control requests stages, the heat relay control determines what actual heat relays are available or energized and tries to provide stages for what is requested. The availability of a heat relays depends on heat being installed, how many stages, and time guards. The type of Heat Installed (Configuration→HEAT→HT.TY) must be set for gas or electric for any stages to be available. The Number of Heat Stages (Configuration→HEAT→N.HTR) configuration tells the control how many heat relays can be used. Heat Stage 1Timeguard (Run
Status→HEAT→TG.H1) and Heat Stage 2 Timeguard (Run Status→HEAT→TG.H2) display the time a respective heat relay
has before it is available for use. The available stages at any given time are displayed as Available Heating Stages (Run Status →HEAT→AVL.H). The actual heat relays on at any given time are displayed as Actual Heating Stages (Operating Modes→HEAT →ACT.H). Heat Stage 1 Relay (Run Status→HEAT→HT.1) and Heat Stage 2 Relay (Run Status→HEAT→HT.2) are displayed on when the respective relay is energized. There are time guards to protect from short cycling, Heat Minimum On Time (Configuration→HEAT→MRT.H) and Heat Minimum Off Time (Configuration→HEAT→MOT.H) apply before a heat relay can be turned back on or turned off.
Integrated Gas Controller (IGC)
The heat staging is determined as described above and the Integrated Gas Controller (IGC) initiates the gas heat module start−up. The Integrated Gas Controller (IGC) minimum on−time of 1 minute will be followed even if Heat Minimum On Time (Configuration→HEAT→MRT.H) is lower and during Service Test. If the IGC temperature limit switch opens within 10 minutes of the end of the gas heat cycle, the next fan off delay will be extended by 15 seconds. The maximum delay is 3 minutes. Once modified by the IGC, the fan off delay will not change back to the configured Fan−off Delay, Gas Heat (Configuration→HEAT →FOD.G) unless power is reset to the control. A light emitting diode (LED) is provided on the IGC to indicate status. During normal operation the LED is continuously on. See the Troubleshooting section if the LED is off or flashing. The IGC is located behind the gas section access panel door.
When the control energizes Heat Stage 1 Relay (Run Status →HEAT→HT.1), power is sent to the W terminal on the IGC board. A check is made to ensure that the rollout switch and limit switch are closed. The induced−draft motor is then energized, and when speed is proven with the Hall Effect sensor on the motor, the ignition activation period begins. The burners will ignite within 5 seconds. If the burners do not light, there is a 22−second delay before another 5−second attempt. If the burners still do not light, this sequence is repeated for 15 minutes. After the 15 minutes have elapsed, if the burners still have not lit, heating is locked out. The control will reset when the request for heat is temporarily removed. When ignition occurs, the IGC board will continue to monitor the condition of the rollout switch, limit switches, the Hall Effect sensor, as well as the flame sensor. If the unit is controlled through a room thermostat or space sensor set for fan auto, 45 seconds after ignition occurs the indoor−fan motor will be energized (and the outdoor−air dampers will open to their minimum position). If for some reason the over temperature limit opens prior to the start of the indoor fan blower, on the next attempt, the 45−second delay will be shortened to 5 seconds less than the time from initiation of heat to when the limit tripped. Gas will not be interrupted to the burners and heating will continue. Once modified, the fan on delay will not change back to 45 seconds unless power is reset to the control. When the control energizes Heat Stage 2 Relay (Run Status→HEAT→HT.2), power is supplied to the second stage of the main gas valve. If both stage 1 and stage 2 of the gas valve close, gas will be turned off to the main burners.
22
Economizer
If an economizer is installed, then Economizer Installed configuration (Configuration→UNIT→EC.EN) should be set to YES. The economizer is controlled by the economizer output signal (Outputs→ECON→EC.CP) on the ECB control. If the indoor fan is off or the building is unoccupied, the economizer position is zero. If in Occupied mode and the unit is heating or cooling and the economizer cannot provide free cooling, the economizer position is the configured economizer minimum position (Configuration→ECON→EC.MN) or the position specified by the IAQ algorithm. If in Unoccupied mode, the position is 0% open.
The economizer will be allowed to help with cooling if the outdoor-air temperature (Te mp er at ur e→AIR.T→OAT) is less than the configured economizer high temperature lockout (Setpoints→EH.LO) and greater than the configured economizer low temperature lockout (Setpoints→EL.LO). If an enthalpy sensor is installed, the outdoor temperature must be below the economizer high temperature lockout and the enthalpy (Inputs→GEN.I→ENTH) must be LOW. If a return air temperature (RAT) sensor is installed and Diff Dry Bulb Control (Configurations→ ECON → DF.DB = Enable) is enabled, the outdoor air temperature must be lower than the return air temperature in addition to the the lockouts and enthaply. For cooling, the economizer position can vary between the configured economizer minimum position (Configuration→ECON→EC.MN) and the economizer maximum cooling position (Configuration→ECON→EC.MX).
Thermostat Control
If the unit is in cooling, operating under thermostat control, Y1 = ON, and the economizer is available for cooling, the economizer will control the supply-air temperature to the low cool set point (Setpoints→LCSP). When Y2 = ON, the economizer will control the supply-air temperature to high cool set point (Setpoints→HCSP).
Space Sensor Control
If the unit is in cooling, operating under space temperature control, the economizer is available for cooling, and no compressors are operating, the economizer will control the SAT to either Setpoints→LCSP or Setpoints→HCSP (See Table 8.) If a compressor is ON, the economizer will try to position itself at the economizer maximum cooling position (Configuration→ECON→EC.MX).
If the control senses low suction pressure for any active refrigerant circuit when the economizer is also providing cooling, the maximum allowable economizer position will be reduced. Factory default configurations have been qualified over a large range of conditions and should only be changed with care. For unit troubleshooting, factory default maximum economizer limits for this condition are provided in Table 9.
Table 8 – LCSP and HCSP Transitions for
Space Temperature Mode
CURRENT SAT
SET POINT
LCSP
HCSP
LCSP
LEGEND HCSP - High Cool Set Point LCSP - Low Cool Set Point SAT - Supply-Air Temperature
Table 9 – Maximum Economizer Limits
COOLING
STAGE Bottom
Middle
To p
SIZES
03‐07
COOL DEMAND
(∆F)
>0.5 HCSP
<0 LCSP
<–0.5 Exit Cooling
NEXT SAT
SET POINT
During Low Suction Pressure
SIZES
08‐14
50 50 50 50 — — 35 50 — 25 25 0
SIZE 16
20-28
SIZES
Economizer Actuator Communications
The actuator used with 48/50PG and PM units is a Multi−Function Technology (MFT) actuator. This allows the ComfortLink system to communicate with the actuator through a feedback signal. The configuration Economizer Control Type determines the communication method, either digital or analog, used to communicate between the ECB and the economizer actuator. Economizer Control Type is accessible via the Scrolling Marquee at Configurations→ECON→E.CTL. The power to the unit
must be cycled after E.CTL is changed.
NOTE: If unit is equipped with Adaptive Fan, the control
automatically defaults the economizer control type to 1 (E.CTL =
1) and controls the actuator digitally. This is because the analog signal from the ECB is used to drive the VFD’s speed and therefore can not be used to control the actuator. The field connection terminal block TB−8 no longer represents the commanded or actual position of the actuator.
E.CTL = 1 or 2 (Digital/Position or Digital/Command)
When E.CTL is set to 1, the ECB will communicate with the economizer actuator using the digital protocol, from ECB J7−1 to actuator pin 5. The commanded position and the actuators actual position are communicated back and forth between actuator and ECB. When the ECB and actuator first initiate communication, a control angle (Operating Modes→ECON→C.ANG) is provided to the ECB and represents the actuator’s range of motion. This control angle must be greater then the minimum angle (Configurations→ECON→M.ANG).
During this digital control, the ECB’s analog 4 to 20mA output will represent the actuator’s actual position when E.CTL = 1 or commanded position when E.CTL = 2. Because the wiring has a built−in 500−ohm resistor, the 4 to 20mA signal is converted to a 2 to 10−v signal that is accessible via field connection terminal board TB−8 and TB−9. However, before this signal can be read remotely, the violet wire that connects the actuator to field connection terminal board TB−J10−8 must be removed or cut.
E.CTL = 3 (Analog Control)
When E.CTL is set to 3, the ECB will NOT communicate with the economizer actuator using the digital MFT. It will instead control the actuator directly with the 4 to 20 mA analog signal wired to TB−8 and TB−9 along with the 500−ohm resistor producing a 2 to 10−v signal for the actuator. While in this mode, the actuator’s built−in 2 to 10−v feedback signal is accessible via TB−9 and TB−10 any time because it is not used by the ECB.
Unoccupied Free Cooling
The unoccupied free cooling algorithm attempts to maintain the building space temperature half way between the occupied cool and occupied heat setpoints using only the economizer when the conditions in the building and the outdoors are suitable. Three different configurations define this algorithm: Unoccupied Free Cooling (Configuration→ECON→UEFC), Free Cooling Preoccupancy Time (Configuration→ECON→FC.TM) and Free Cool Low Temp Limit (Configuration→ECON→FC.LO).
UEFC = 0 (Disabled)
When UEFC = 0, unoccupied free cooling is disabled. Cooling will only occur if the space exceeds the unoccupied setpoints.
UEFC = 1 (Unoccupied)
When UEFC is set to 1, unoccupied free cooling can occur throughout the entire unoccupied period. The space temperature must be higher then the mid−point between the occupied cooling and heating setpoints.
UEFC = 2 (Preoccupancy)
When UEFC is set to 2, unoccupied free cooling can only occur when the time until the next occupied period is less than the Free Cool PreOcc Time (FC.TM) in minutes.
48/50PG and PM
23
Free Cool PreOcc Time (FC.TM)
Free Cool Low Temp Limit (FC.LO)
Unoccupied free cooling cannot occur if the Outdoor Air Temperature (Temperature→ AIR.T→ OAT) is less than FC.LO.
Power Exhaust
To enable power exhaust, Configuration→ECON→PE.EN must be set to ENBL. If power exhaust is enabled, Power Exhaust 1 will turn on when the economizer position is greater than the value of Configuration→ECON→PE.1. If power exhaust is enabled, Power Exhaust 2 will turn on when the economizer position is greater than the value of Configuration→ECON→PE.2. There are small time delays to ensure that rapid cycling does not occur.
Optional Humidi−MiZert Dehumidification System
Units with the factory−equipped Humidi−MiZer option are capable of providing multiple modes of improved dehumidification as a variation of the normal cooling cycle. The Humidi−MiZer option includes additional valves in the liquid line and discharge line of
48/50PG and PM
each refrigerant circuit, a small reheat condenser coil downstream of the evaporator, and Motormaster variable−speed control of some or all outdoor fans. The Humidi−MiZer Equipped (Configuration→HMZR→REHT) configuration is factory set to Yes for Humidi−MiZer equipped units. This enables Humidi−MiZer operating modes and service test.
NOTE: If the unit is a Humidi−MiZer unit, this configuration must always be set to yes. The Humidi−MiZer option does affect the base unit wiring.
Humidi−MiZer operation requires installation and configuration of either a space relative humidity sensor or a relative humidity switch input. Space Humidity Switch (Configuration→UNIT→RH.SW) set to 1 for use of a normally open switch or 2 for normally closed switch. The switch is wired to field connection terminal board terminals labeled HUMDISTAT. Set RH Sensor on OAQ Input (Configuration→UNIT→RH.S) to Yes for use of a 4 to 20 mA output RH sensor wired to field connection terminal board (TB) terminals 1 and 4 (for loop powered). RH Sensor Value at 4ma (Configuration→AIR.Q→H.4M) sets the % display for a 4mA input from the relative humidity sensor. RH Sensor Value at 20ma (Configuration→AIR.Q→H.20M) sets the % display for a 20mA input from the relative humidity sensor.
Dehumidification Demand
When using a humidistat or switch input, the demand for dehumidification is seen as Space Humidity Switch (Inputs →GEN.I→HUM) being Low or High. A low value means humidity level is good and a high value means that dehumidification is needed. When using an RH sensor, the demand is based on the Space Humidity Sensor (Inputs→AIR.Q→SP.RH) value compared to the Space RH Occupied Setpoint (Setpoints→RH.SP) during the occupied period and Space RH Unoccupied Setpoint (Setpoints → RH.UN) during unoccupied periods. If the Space Humidity Sensor (SP.RH) value is above the Space RH Setpoint (RH.SP), then dehumidification is needed. If the Space Humidity Sensor (SP.RH) value is below the Space RH Setpoint (RH.SP) minus the Space RH Deadband (Setpoints→RH.DB), then dehumidification is no longer needed. If the unit is configured for space sensor control (Configuration→UNIT →U.CTL = 3), then the setpoint Reheat Heat SP Deadband (Setpoints→RH.HB) applies. This configuration sets the offset above the heating set point at which a unit in Reheat2 mode will turn off. This is a protection against over cooling the space and causing a heat demand.
NOTE: When there is a dehumidification demand, the economizer damper position is limited to it’s minimum damper position (Operating Mode→ECON→EC.MP).
Reheat Modes
Dehumidification (reheat) is a cooling mode function. Refer to Cooling Operation for cooling mode control. With Humidi−MiZer units there are three additional HVAC Mode (HVAC) expanded texts available for the user: Reheat1, Reheat2, and Reheat1/Reheat2. Selection of the reheat mode for each refrigerant circuit is determined by the dehumidification demand and the cooling demand. Table 10 shows the corresponding circuit mode and output status for the different demand combinations. Units with multiple circuits can operate with a combination of Reheat1 and Reheat2 circuits, as determined by the amount of space cooling demand. See Appendix B for complete tables of unit operation response to thermostat and humidity inputs.
NOTE: Compressor staging control for Humidi−MiZer units requires that circuit A always operates when either circuits B or C are on. This applies to normal operation, service test, and for control alarm responses. This operation difference is required due to the fact that the Motormaster outdoor fan control senses circuit A only. Operation of the revised refrigerant circuit for each mode is described below.
NOTE: x = refrigerant circuit A, B, or C
Normal Cooling
For 48/50PG03−16 units, refrigerant flows from the outdoor condenser through the normally open Cooling Valve (CV.x) to the expansion device. Reheat1 Valve (RH1.x) and Reheat2 Valve (RH2.x) are closed. (See Fig. 9.)
For 48/50PG20−28 and 48/50PM16−28 units, refrigerant flows from the outdoor condenser through the de−energized 3−way valve (RH.x) to the expansion device. Reheat2 Valve (RH2.x) is closed. (See Fig. 12.)
Reheat 1 (Subcooling Mode)
This mode increases latent cooling and decreases sensible cooling compared to normal cooling.
For 48/50PG03−16 units, refrigerant flows from the outdoor condenser, through the normally open Reheat 1 Valve (RH1.x), and through the reheat condenser coil to the expansion device. Cooling Valve (CV.x) and Reheat2 Valve (RH2.x) are closed. (See Fig. 10.)
For 48/50PG20−28 and 48/50PM16−28 units, refrigerant flows from the outdoor condenser, through the energized 3−way Valve (RH1.x), and through the reheat condenser coil to the expansion device. Cooling Reheat2 Valve (RH2.x) is closed. (See Fig. 13.)
Reheat 2 (Hot Gas Reheat Mode)
This mode provides maximum latent cooling with little to no sensible capacity. This mode can operate to provide dehumidification when there is no cooling demand. Similar to Reheat 1 mode, refrigerant flows from the outdoor condenser, through the normally open Reheat 1 Valve (RH1.x), or through the energized 3−way valve (RH.1x), and through the reheat condenser coil to the expansion device. Reheat2 Valve (RH2.x) is open which provides some compressor discharge gas to the reheat condenser to further increase the reheat of the evaporator air stream (See Fig. 11 or 14 based on unit and size).
NOTE: Humidi−MiZer outdoor fan configurations are dependent on the specific unit and should not be changed. The configurations are provided in case a field replacement of a control board occurs and the settings need to be checked or manually configured. See Appendix A for range and defaults.
24
Table 10 – Control Modes with Humidi−MiZert System
Output and Valve States versus Circuit Mode .x = Circuit A, B, or C identifier
DEMAND AND MODE OUTPUTS 48/50PG03-16 VALVES
Space
Humidity
— —
Low No Off
Low Ye s Cool On On Off Off
High Ye s Reheat1 On On On Off
High No Reheat2 On On On On
Circuit Cooling Demand
Circuit
Mode
No
power
Indoor
Fan (IDF)
OFF Off Off Off
Per
Ventilation
Control
Circuit
Compressor
(CMP.x)
Off Off Off
RH2.x
Cooling-
Reheat Control (CRC)*
Reheat2
Valve
(RH2.x)
CV.x
Valve
2-way
Off
(open)
Off
(open)On(closed)
Off
(open)On(closed)
On
(closed)
On
(closed)
RH1.x Valve
2-way
(open)
(open)
(open)
Off
Off
Off
RH2.x
Valve
2-way
Off
(closed)
Off
(closed)
Off
(closed)
Off
(closed)
On
(open)
48/50PG20-28 48/50PM16-28
VALVES
RH1.x
Valve
3-way
Off
Off
Off
On
On
RH2.x Valve
2-way
Off
(closed)
Off
(closed)
Off
(closed)
Off
(closed)
On
(open)
48/50PG and PM
COMP
CLOSED VALVE
OPEN VALVE
3-WAY VALVE
COND COIL
HUMIDI-MIZER COIL
CV.x
OUTDOOR AIR
EVAP COIL
INDOOR ENTERING
AIR
Fig. 9 − Normal Cooling Mode — Humidi−MiZert System
48/50PG03−16
RH1.x
METERING DEVICE
C07003
25
RH2.x
COMP
48/50PG and PM
CLOSED VALVE
OPEN VALVE 3-WAY VALVE
COND COIL
CV.x
OUTDOOR AIR
RH1.x
HUMIDI-MIZER COIL
EVAP COIL
INDOOR ENTERING
AIR
Fig. 10 − Subcooling Mode (Reheat1) — Humidi−MiZert System
48/50PG03−16
RH2.x
METERING DEVICE
C07004
COMP
CLOSED VALVE
OPEN VALVE
COND COIL
CV.x
OUTDOOR AIR
RH1.x
HUMIDI-MIZER COIL
EVAP COIL
INDOOR ENTERING
AIR
Fig. 11 − Hot Gas Reheat Mode (Reheat2) — Humidi−MiZer System
48/50PG03−16
METERING DEVICE
a48-8174
C07005
26
RH2.x
COMP
CLOSED VALVE
OPEN VALVE 3-WAY VALVE
COND COIL
OUTDOOR AIR
a48-8222
RH1.x
HUMIDI-MIZER COIL
EVAP COIL
INDOOR ENTERING
AIR
Fig. 12 − Normal Cooling Mode — Humidi−MiZert System
48/50PG20−28 and 48/50PM16−28
RH2.x
METERING DEVICE
48/50PG and PM
a48-8172
C07122
COMP
CLOSED VALVE
OPEN VALVE 3-WAY VALVE
COND COIL
OUTDOOR AIR
RH1.x
HUMIDI-MIZER COIL
EVAP COIL
INDOOR ENTERING
AIR
Fig. 13 − Subcooling Mode (Reheat1) — Humidi−MiZer System
48/50PG20−28 and 48/50PM16−28
METERING DEVICE
C07123
27
RH2.x
COMP
48/50PG and PM
Reheat Control
The cooling staging and compressor control routines are responsible for controlling each circuit in one of the three sub−modes (Cool, Reheat1, or Reheat2). When there is only a cooling demand, one or more circuits will operate in normal cooling mode. When there is only dehumidification demand, all circuits will operate in Reheat2 mode. When there is both cooling demand and dehumidification demand, all circuits will operate in either Reheat1 or Reheat2 mode, with the portion of Reheat1 circuits determined from the cooling demand. The Requested Reheat2 Stages (Operating Modes→COOL→HMZR→REQ.R) shows the control’s request for reheat circuits if cooling is not already requesting all stages. Available Reheat2 Stages (Operating Modes→COOL→HMZR→AVL.R) displays circuits that are available for reheat use. Actual Reheat2 Stages (Operating Modes→COOL→HMZR→ACT.R) displays the current number of circuits running in Reheat2 mode. These three status points should only be monitored when there is only a dehumidification demand, because their values can be forfeited to cooling stages when cooling demand is present. Reheat2 Stage Incr. Time (Configuration→HMZR →R.INC) and Reheat2 Stage Decr. Time (Configuration→HMZR→R.DEC) set the time delay when adding or subtracting a compressor for a reheat function. These only apply when using adaptive thermostat or space sensor control. There are three relay outputs that show reheat status. Cool − > Reheat1 Control (Outputs→COOL→CRC) show when the unit has switch from pure cooling to reheat ready (based on a dehumidification demand). Reheat2 Valve A (Outputs→COOL→RH2.A) and Reheat2 Valve B,C (Outputs→COOL→RH2.B) display when the respective circuit’s Reheat2 valve is energized.
CLOSED VALVE
OPEN VALVE
3-WAY VALVE
COND COIL
OUTDOOR AIR
RH1.x
HUMIDI-MIZER COIL
EVAP COIL
INDOOR ENTERING
AIR
Fig. 14 − Hot Gas Reheat Mode (Reheat2) — Humidi−MiZert System
48/50PG20−28 and 48/50PM16−28
A circuit can be restricted from Reheat2 operation by the outside temperature and saturated suction temperature. Reheat2 OAT Limit A (Configuration→HMZR→RA.LO) and Reheat2 OAT Limit B,C (Configuration→HMZR→RB.LO) set the lowest outside temperature the respected circuit is allowed to run in reheat2 mode. The lockout on/off status is shown as Reheat2 OAT Lockout A (Operating Modes→COOL→HMZR→R.LO.A) and Reheat2 OAT Lockout B,C (Operating Modes→COOL→HMZR →R.LO.B) for their respective circuit. If a circuit’s saturated suction pressure falls below the low limit configuration during Reheat2 operation, the circuit will switch to reheat1 (the circuits Reheat2 valve will be turned off) for at least 2 minutes and until its suction rises back above the high limit. Reheat2 SSP Lo Limit A (Configuration→HMZR→RA.LP) and Reheat2 SSP Lo Limit B,C (Configuration→HMZR→RB.LP) set the low pressure limit for Reheat2 mode for individual circuits. Reheat2 SSP Hi Limit A (Configuration→HMZR→RA.HP) and Reheat2 SSP Hi Limit B, C (Configuration→HMZR→RB.HP) set the high pressure limit for Reheat2 mode for each circuit.
Reheat Outdoor Fan Control
On specific units, the outdoor fans are controlled differently while in a reheat mode versus just cooling mode. If Reheat Fan Control (Configurations → HMZR → RH.FN) is set to yes, reheat fan control is enabled and anytime the unit is running reheat it will use the following logic to control the outdoor fans.
METERING DEVICE
C07124
28
Reheat Mode Diagnostic Help
The status of reheat mode sensor inputs may be viewed within the display Inputs menu. The status of reheat mode outputs may be viewed within the display Outputs or Run Status→COOL menus. Additional diagnostic help, including status of circuit reheat temperature limit lockouts may be viewed within the Humidi-MiZer sub-menu of the cooling mode diagnostic table at Operating Modes→COOL→HMZR.
The Service Test mode may be used to force the system to operate in various stages of Reheat1 or Reheat2 mode, or to independently operate the reheat valve control outputs. Fig. 15−19 show the valve locations of Humidi−MiZer equipped units.
The following forced operating states are changed or added to the available service test operation for a Humidi-MiZer equipped unit:
Service Test"COOL"CMP.A (Cool A Test)
A value of On will turn on circuit A in Normal Cooling mode.
Service Test→COOL→CMP.B (Cool B Test)
A value of On will turn on circuits A and B in Normal Cooling mode.
Service Test→COOL→CMP.C (Cool C Test)
A value of On will turn on circuits A and C in Normal Cooling mode.
Service Test"HMZR"RH1.A (Reheat1 A Test)
A value of On will turn on circuit A in Reheat1 mode.
Service Test"HMZR"RH1.B (Reheat1 B Test)
A value of On will turn on circuits A and B in Reheat1 mode.
Service Test"HMZR"RH1.C (Reheat1 C Test)
A value of On will turn on circuits A and C in Reheat 1 mode.
Service Test"HMZR"RH2.A (Reheat2 A Test)
A value of On will turn on circuit A in Reheat2 mode.
Service Test"HMZR"RH2.B (Reheat2 B, C Test)
A value of On will turn on circuits A B and C in Reheat2 mode.
Service Test"HMZR"CRC (Cool-Reheat1 Valve Test)
For 48/50PG03−16 units, a value of On will turn on the CRC relay. This will turn on CV.x valves and turn off RH1.x valves.
For 48/50PG20−28 and 48/50PM16−28 units, a value of On will turn on the CRC relay. This will energize RH.1 and RH.B.
Service Test"HMZR"RHV.A (Reheat2 Valve A Test)
A value of On will turn on the RH2.A valve.
Service Test"HMZR"RHV.B (Reheat2 Valve B,C Test)
A value of On will turn on the RH2.B and RH2.C valves.
Service Test"Fans"OFC.1 (Outdoor Fan 1 Test)
For 48/50PG03−14: not used. For 48/50PG16 only: a value of On will turn on the OFC relay only which controls status of fans 1 and 3; but fans are not powered unless compressor A contactor is on. For 48/50PG20−28 and 48/50PM16−28: Turning on OFC1, provides power to the Motormaster controller. Outdoor fans 1 and 4 will operate under the control of the Motormaster controller.
Service Test"Fans"OFC.2 (Outdoor Fan 2 Test)
For 48/50PG03−16: Not used. For 48/50PG20−28 and 48/50PM16−28: Turn on OFC2. Outdoor fans 2, 3, 5, and 6 will operate.
Service Test"Fans"OFC.3 (Outdoor Fan 1 Test)
Not used.
Service Test"INDP"CCH (Crankcase Heat Test)
Not used. Compressor crankcase heaters are wired directly to line power.
RH1A
CVA
RH2A
LEGEND
CV -- Cooling Valve RH -- Reheat Valve
Fig. 15 − Humidi−MiZert System Valve Locations
48/50PG03−07
RH1B
CVB
RH2B
CVA
RH2A
LEGEND
CV -- Cooling Valve RH -- Reheat Valve
RH1A
Fig. 16 − Humidi−MiZert System Valve Locations
48/50PG08−14
C07007
C07006
48/50PG and PM
29
48/50PG and PM
Fig. 17 − Humidi−MiZer System Valve Locations
Air Baffles
The units with Humidi-MiZer option are equipped with Motormaster control to maintain adequate discharge pressure for proper unit operation during low ambient operation. This becomes especially critical in the Reheat2 mode of operation. Wind could have a detrimental effect depending on the orientation and the expected design latent load of the space. If the unit is oriented with the vertical condenser coil toward the prevailing wind, then the field-fabricated wind baffles are required. If the unit is not oriented as described above, but there is expected long operational periods in the Reheat2 mode, then the field-fabricated wind baffles are recommended. See Fig. 18 or 19 for dimensions of the field-fabricated wind baffles.
Indoor Air Quality (IAQ)
The ComfortLink control has the capability for several methods of demand ventilation control. Indoor air quality is typically measured using a CO2 sensor whose measurements are displayed in parts per million (ppm). Outdoor air quality may be measured with a CO2 sensor for indoor-outdoor differential demand ventilation control, or with other sensor types for the outdoor air lockout function. The factory-installed indoor air quality CO sensor is mounted in the return section. A field-installed indoor air quality CO occupied space, per job requirements. The indoor air quality modes of operation can be affected by configurations for indoor air quality sensor (Configuration→AIR.Q→IA.CF), indoor air quality switch (Configuration→AIR.Q→II.CF), outdoor air quality sensor (Configuration→AIR.Q→OA.CF) and other related fan and limit configurations as described below.
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sensor may be mounted in the return or directly in the
2
IAQ (Analog Input)
The ComfortLink control is configured for indoor air quality sensors which provide 4 to 20 mA for 0 to 2000 ppm. If a sensor has a different range, the ppm display range must be reconfigured by entering new values for Configuration→AIR.Q→I.4M and Configuration→AIR.Q→I.20M.
IA.CF = 0 (No IAQ)
IA.CF = 0 signifies that there is no IAQ sensor installed. The damper will operate at the Configuration→AIR.Q→EC.MN position when the space is occupied and the indoor fan is on.
IA.CF = 1 (DCV)
When IA.CF = 1, the IAQ algorithm is set for Demand Control Ventilation (DCV). During DCV, the damper modulates between two user configurations depending upon the relationship between the IAQ and the Outdoor Air Quality (OAQ). The lower of these two positions is referred to as the Minimum IAQ Damper Position (Configuration→AIR.Q→AQ.MN) while the higher is referred to as Economizer Minimum Position (EC.MN). The AQ.MN should be set to an economizer position that brings in enough fresh air to remove contaminants and CO people. The EC.MN should be set to an economizer position that brings in enough fresh air to remove contaminants and CO generated by all sources including people. The EC.MN value is the design value for maximum occupancy.
The ComfortLink control will begin to open the damper from the AQ.MN position when the IAQ level begins to exceed the Outdoor Air Quality (OAQ) level by a configurable amount. This amount is referred to as AQ Differential Low (Configuration→AIR.Q→AQD.L). When the differential between IAQ and OAQ reaches AQ Differential High (Configuration→AIR.Q→AQD.H), the economizer position will be EC.MN. When the IAQ/OAQ differential is between AQD.L and AQD.H, the control will modulate the damper between AQ.MN and EC.MN in a linear manner as shown in Fig. 20. The damper position will never exceed the bounds specified by AQ.MN and EC.MN during IAQ control.
IA.CF = 2 (Override IAQ)
When IA.CF = 2, the IAQ algorithm maintains the damper at Configuration →AIR.Q→EC.MN until the override condition
triggers. The override triggers when the IAQ/OAQ differential is greater than Configuration→AIR.Q→AQD.H. The override position is Configuration→AIR.Q→OVR.P (Economizer Override Position). The economizer position will return to EC.MN when the IAQ/OAQ differential is less than Configuration →AIR.Q→AQD.L.
The Override algorithm will operate whenever the building is occupied and the indoor fan is operating or whenever the IAQ
2
algorithm has caused the indoor fan to operate. The configuration IA.FN determines whether or not the IAQ algorithm can turn on the indoor fan.
If the indoor fan is not operating, the economizer position will be zero. If the override is not active and the building is unoccupied, the economizer position will be zero. The damper position may exceed Configuration→AIR.→EC.MN or Configuration→AIR.Q→OVR.P to provide economizer cooling.
generated by sources other than
2
2
30
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Fig. 18 − Air Baffle Dimensions
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Fig. 19 − Air Baffle Dimensions
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ECONOMIZER MINIMUM DAMPER POSITION
(EC. MN)
VENTILATION FOR PEOPLE
MINIMUM IAQ DAMPER POSITION
(AQ. MN)
INCREASING VENTILATION
VENTILATION FOR SOURCES
100
AQ DIFFERENTIAL LOW (AQD.L)
Fig. 20 − IAQ Control
IA.CF = 3 (Control Minimum Position)
When IA.CF = 3, an external 4 to 20 mA source is used to set the minimum position. The 4 mA signal corresponds to 0% and the 20 mA signal corresponds to 100%. In this mode, configurations such as Configuration→AIR.Q→EC.MN and Configuration→ AIR.Q→AQ.MN are not used.
If the indoor fan is not operating, the economizer position will be zero. The damper position may exceed the economizer minimum position to provide economizer cooling.
IAQ (Switch Input)
Indoor air quality can also be measured using a switch input. For the purpose of specifying the type of switch input, low CO are considered normal. The IAQ switch input is defined by the configuration by Configuration→AIR.Q→II.CF IAQ Level (Switch Input). Enthalpy and IAQ are controlled by the same switch input and therefore they cannot be used simultaneously.
II.CF = 0 (No IAQ)
The II.CF = 0 configuration signifies that there is no IAQ switch input. The damper will operate at the EC.MN position when the space is occupied and the indoor fan is on.
II.CF = 1 (DCV NO) or II.CF = 2 (DCV NC)
The Demand Control Ventilation (DCV) allows the economizer minimum position to be decreased when there is no IAQ problem. If IAQ is low, the economizer minimum position is Minimum IAQ Damper Position (Configuration→AIR.Q→AQ.MN). If IAQ is high, the economizer minimum position is the Economizer Minimum Position (Configuration→AIR.Q→EC.MN).
levels
2
700
AQ DIFFERENTIAL HIGH (AQD.H)
INSIDE/OUTSIDE CO
DIFFERENTIAL
2
II.CF = 3 (Override NO) or II.CF = 4 (Override NC)
The damper override function permits absolute positioning of the economizer damper for ventilation purposes. The override is active when IAQ is high and inactive when IAQ is low. The override position is configurable by the configuration by Configuration →AIR.Q→OVR.P (Economizer Override Position).
Outdoor Air Quality (Analog Input)
The ComfortLink control is configured for outdoor air quality sensors which provide 4 to 20 mA for 0 to 2000 ppm. If a sensor has a different range, the ppm display range must be reconfigured by entering new values for Configuration→AIR.Q →O.4M and Configuration→AIR.Q→O.20M.
OA.CF = 0 (No OAQ)
This signifies there is no outdoor air sensor installed. The default value of OAQ is 400 ppm.
OA.CF = 1 (DCV)
The outdoor air quality sensor analog input is for the value of OAQ during demand control ventilation operation.
OA.CF = 2 (OAQ Lockout)
The outdoor air quality sensor analog input is only used to lock out the outdoor ventilation. The economizer commanded position is set to 0% when the ppm exceeds the OAQ lockout value configured for Configuration→AIR.Q→OAQ.L. The default value of OAQ.L is 600 ppm.
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Fan Enable (Analog IAQ Sensor)
The DCV algorithm will operate whenever the building is occupied and the indoor fan is operating or whenever the IAQ algorithm has caused the indoor fan to operate. The configuration Configuration→AIR.Q→IA.FN (Fan Enable for IAQ), determines whether or not the IAQ algorithm can turn on the indoor fan. If the indoor fan is not operating, the economizer position will be zero. The damper position may exceed Configuration→AIR.Q→EC.MN to provide economizer cooling.
IA.FN = 0 (Never)
When IA.FN = 0, the IAQ algorithm can never turn on the fan.
IA.FN = 1 (Occupied)
When IA.FN = 1, the IAQ algorithm will turn on the indoor fan whenever the building is occupied and IAQ/OAQ differential is greater than the configuration Configuration→AIR.Q→ DF.ON (Fan On AQ Differential). The indoor fan will turn off when the IAQ/OAQ differential is less than the configuration Configuration→AIR.Q→DF.OF (Fan Off AQ Differential).
IA.FN = 2 (Always)
The indoor fan performance for IA.FN = 2 is the same as the performance when IA.FN = 1 except the algorithm is not limited to
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occupied periods only. The fan can be triggered on when the space is occupied or unoccupied.
Fan Enable (Switch Input)
The DCV algorithm will operate whenever the building is occupied and the indoor fan is operating or the whenever the IAQ algorithm has caused the indoor fan to operate. The configuration Configuration→AIR.Q→II.FN (IAQ Switch Input Fan CFG) determines whether or not the IAQ algorithm can turn on the indoor fan. If the indoor fan is not operating, the economizer position will be zero. The damper position may exceed Configuration→AIR.Q→EC.MN to provide economizer cooling.
II.FN = 0 (Never)
When II.FN = 0, the IAQ algorithm can never turn on the fan. II.FN = 1 (Occupied)
When II.FN = 1, the IAQ algorithm will turn on the indoor fan whenever the building is occupied and IAQ is high. The indoor fan will turn off if IAQ returns to normal.
II.FN = 2 (Always)
The indoor fan performance for II.FN = 2 is the same as the performance when II.FN = 1 except the algorithm is not limited to occupied periods only. The fan can be triggered on when the space is occupied or unoccupied.
EnergyX
For units equipped with the EnergyX factory installed option, there will be an EnergyXv2 Supplement Installation Instructions in the unit’s information packet. Refer to this supplement for details on how the ERV operates relative to the base unit.
Adaptive Fan
The Adaptive Fan Option is a new method of controlling the supply fan in a typical constant volume rooftop unit. This control method employs a Variable Frequency Drive (VFD) to operate the supply fan at different speeds in order to achieve energy savings through reduced fan power. This method is specifically not concerned with controlling static pressure in the supply duct, but rather with setting different fan speeds for different operating conditions, such as ventilation mode or part−load mechanical cooling. This option should not be confused with a linearly variable VFD concept − the different speeds are pre−programmed per condition; there is no linear−modulation of fan speed. Adaptive Fan is enabled by setting Adaptive Fan Operation to yes, (Configuration→A.FAN→AF.EN = Ye s ).
The adaptive fan function is NOT a Variable Air Volume (VAV) function. The fan adapts its speed to one of nine based on mode and current state to satisfy a demand. The nine speeds consist of two hard coded values and seven configurable values. The two hard coded values are 0% (or OFF) and 100%. The seven configurable fan speeds are: Ventilation (FS.VN), IAQ Override (FS.AQ), Free Cool Lo (FS.E1), Free Cool Hi (FS.E2), Mech Cooling (FS.CL), Heating (FS.HT), and Reheat2 (FS.RH).
The VFD is powered by the indoor fan contactor and is always on unless the unit is in test mode. When the thermostat or space sensor control conditions require the fan on, the VFD will then ramp to desired speed. Fan speed is always calculated by evaluating the current applicable conditions. Each fan speed “mode” is evaluated independently, and the highest fan speed is used. For example, if an IAQ Override event occurs during Ventilation mode, the fan speed is set to the higher of the two (FE.VN or FS.AQ)
Fan Speed − Ventilation (FS.VN)
This configuration defines the fan speed used in Ventilation (fan−only) mode. Ventilation mode is when the supply fan is running, but there is no demand for heating or cooling.
Fan Speed − IAQ Override (FS.AQ)
This configuration defines the fan speed used when an IAQ Override is active. This pertains only to the Override function of IAQ (Configuration→AIR.Q→IA.CF = 2) (Override IAQ) or (Configuration→AIR.Q→II.CF = 3 or 4) (Override N/O or N/C), not the DCV or Minimum Position functions.
Fan Speed − Free Cool Lo (FS.E1)
This configuration defines the fan speed used when in Free Cooling at low cool mode. Refer to the Economizer Controls Operation section for details on low cool mode.
Fan Speed − Free Cool Hi (FS.E2)
This configuration defines the fan speed used when in Free Cooling at high cool mode. Refer to the Economizer Controls Operation section for details on high cool mode.
Fan Speed − Mech Cooling (FS.CL)
This configuration defines the intermediate fan speed used when mechanical cooling is being requested. Fan speed is based on how many cooling stages the unit has, how many cooling stages are being requested, and how many reheat stages are being requested. If the unit only has one circuit of cooling, then the fan speed will be 100% whenever that stage is requested. If the unit has more then one circuit of cooling but only one is being requested, the fan speed will be set to FS.CL. Any time more than one stage is requested the fan speed will be set to 100%. On Humidi−MiZer equipped units fan speed is more complex. Refer to the FS.RH and Table 11 for details.
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Fan Speed − Reheat2 (FS.RH)
This configuration defines the fan speed used when Hot Gas Reheat (reheat2) is being requested. Fan speed is based on how many cooling stages the unit has, how many cooling stages are being requested, and how many reheat stages are being requested. If only reheat stages are being requested, then the fan speed will be set to FS.RH. If the unit only has one circuit of cooling, then the fan speed will be 100% when dehumidification and cooling is being requested. If the unit has more then one circuit of cooling and only one cooling stage is being requested, the fan speed will be set to FS.CL. Any time more then one cooling stage is requested the fan speed will be set to 100%. If only one cooling stage is requested and reheat is requested, then the fan speed will be set to the greater of the two configurations (FS.CL or FS.RH). (See Table 11.)
Fan Speed − Heating (FS.HT)
This configuration defines the intermediate fan speed used when in heating mode. Fan speed is based on how many heating stages the unit has and how many heating stages are actually on. If the unit only has one stage of heat, then the fan speed is set to 100% anytime the heat stage is on. If the unit has more than one stage of heat but only one heat stage is on, then the fan speed will be set to FS.HT. Any time more than one stage of heat is on, the fan speed is set to 100%.
Table 11 – Cooling Fan Speed Determination
Number
of
Circuits
1
>1
Cooling
Stages
Requested
1 0 Cooling 100% 1 >0 Reheat1 100% 0 >0 Reheat2 FS.RH
1 0 Cooling FS.CL >1 0 Cooling 100% >1 >0 Reheat1 100%
1 >0
0 >0 Reheat2 FS.RH
Reheat Stages
Requested
HVAC Mode
Reheat1/
Reheat2
Fan
Speed
FS.CL
or
FS.RH
Temperature Compensated Start
This logic is used when the unit is in the unoccupied state. The control will calculate early Start Bias time based on Space Temperature deviation from the occupied cooling and heating set points. This will allow the control to start the unit so that the space is at conditioned levels when the occupied period starts. This is required for ASHRAE 90.1 compliance. A space sensor is required for non-linkage applications.
Setting Up the System
The settings for temperature compensated start can be found in the local display under Configuration→UNIT.
ITEM EXPANSION RANGE UNITS CCN POINT
TCS.C
TCS.H
Temp Comp Strt Cool Factr (TCS.C)
This is the factor for the start time bias equation for cooling.
Temp Comp Strt Heat Factr (TCS.H)
This is the factor for the start time bias equation for heating.
NOTE: Temperature compensated start is disabled when these factors are set to 0.
Temp.Cmp.Strt.Cool Factr 0 ‐ 60 min TCSTCOOL Temp.Cmp.Strt.Heat Factr 0 ‐ 60 min TCSTHEAT
Temperature Compensated Start Logic
The following conditions must be met for the algorithm to run:
Unit is in unoccupied state.Next occupied time is valid.Current time of day is valid.Valid space temperature reading is available (sensor or CCN
network).
The algorithm will calculate a Start Bias time in minutes using the following equations:
If (space temperature > occupied cooling set point)
Start Bias Time = (space temperature – occupied cooling set point)* TCS.C
If (space temperature < occupied heating set point)
Start Bias Time = (occupied heating set point – space temperature)*TCS.H
When the Start Bias Time is greater than zero the algorithm will subtract it from the next occupied time to calculate the new start time. When the new start time is reached, the Temperature Compensated Start mode is set, the fan is started and the unit controlled as in an occupied state. Once set, Temperature Compensated mode will stay on until the unit goes into the Occupied mode. The Start Bias Time will be written into the CCN Linkage Equipment Table if the unit is controlled in DAV mode. If the Unoccupied Economizer Free Cool mode is active when temperature compensated start begins, the Unoccupied Free Cool mode will be stopped.
NOTE: The maximum minutes Start Bias can be is 180.
Carrier Comfort Network (CCN)R Configuration
It is possible to configure the ComfortLink control to participate as an element of the Carrier Comfort Network (CCN) system directly from the local display. This section will deal with explaining the various programmable options which are found under the CCN sub-menu in the Configuration mode.
The major configurations for CCN programming are located in the local displays at Configuration→CCN. See Appendix A.
CCN Address (CCN.A)
This configuration is the CCN address the rooftop is assigned.
CCN Address (CCN.B)
This configuration is the CCN bus the rooftop is assigned.
CCN Baud Rate (BAUD)
This configuration is the CCN baud rate.
CCN Time/Date Broadcast (BROD"B.TIM)
If this configuration is set to ON, the control will periodically send the time and date out onto the CCN bus once a minute. If this device is on a CCN network then it will be important to make sure that only one device on the bus has this configuration set to ON. If more than one time broadcaster is present, problems with the time will occur.
NOTE: Only the time and date broadcaster can perform daylight savings time adjustments. Even if the rooftop is stand alone, the user may want to set this to ON to accomplish the daylight/savings function.
CCN OAT Broadcast (BROD"B.OAT)
If this configuration is set to ON, the control will periodically broadcast its outside-air temperature at a rate of once every 30 minutes.
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Global Schedule Broadcast (BROD"B.GS)
If this configuration is set to ON and the schedule number (SCH.N) is between 65 and 99, then the control will broadcast the internal time schedule once every 2 minutes.
CCN Broadcast Acknowledger (BROD"B.ACK)
If this configuration is set to ON, then when any broadcasting is done on the bus, this device will respond to and acknowledge. Only one device per bus can be configured for this option.
Schedule Number (SCH.O"SCH.N)
This configuration determines what schedule the control may follow.
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Accept Global Holidays? (SCH.O"HOL.G)
If a device is broadcasting the time on the bus, it is possible to accept the time yet not accept the global holiday from the broadcast message.
Override Time Limit (SCH.O"OV.TL)
This configuration allows the user to decide how long an override occurs when it is initiated. The override may be configured from 1 to 4 hours. If the time is set to 0, the override function will become disabled.
Timed Override Hours (SCH.O"OV.EX)
This displays the current number of hours left in an override. It is possible to cancel an override in progress by writing “0” to this variable, thereby removing the override time left.
SPT Override Enabled? (SCH.O"OV.SP)
If a space sensor is present, then it is possible to override an unoccupied period by pushing the override button on the T55 or T56 sensor. This option allows the user to disable this function by setting this configuration to NO.
Demand Limit
Demand Limit Control may override the cooling algorithm to limit or reduce cooling capacity during run time. The term Demand Limit Control refers to the restriction of machine capacity to control the amount of power that a machine will use. This can save the owner money by limiting peaks in the power supply. Demand limit control is intended to interface with an external network system. This is through a CCN Loadshed POC Device or writing to network points.
To limit stages through network writes, the points Run Status →COOL→MAX.C and Run Status→HEAT→MAX.H are forced on the network through CCN points MAXCSTGS and MAXHSTGS respectively. Force these to the desired maximum stages of cooling/dehumidification and heating, respectively. When there is no force on these points, they automatically reset to allow all cooling/dehumidification and heating stages to be used. These points are reset at power−on/reset (POR).
SCH.N = 0 The control is always occupied.
SCH.N = 1 The control follows its internal
time schedules. The user may
enter any number between 1
and 64 but it will be overwritten
to “1” by the control as it only
has one internal schedule.
SCH.N = 65-99 The control is either set up to
receive to a broadcasted time
schedule set to this number or
the control is set up to broad
cast its internal time schedule (B.GS) to the network and this is the global schedule number it is
broadcasting. If this is the case,
then the control still follows its
internal time schedules.
When using the Loadshed POC to do Demand Limiting, the cool and heat stage limits under both Redline and Loadshed conditions can be set individually with configuration decisions. If the active stages is greater then the loadshed or redline configurations when a loadshed or redline command is given, the unit will remove stages.
Configuration→CCN→LDSH→S.GRP
This is the Loadshed Group Number and corresponds to the loadshed supervisory devices that resides elsewhere on the CCN network and broadcasts loadshed and redline commands to its associated equipment parts. This variable will default to zero which is an invalid group number. This allows the loadshed function to be disabled until configured.
Configuration→CCN→LDSH→R.MXC
This configuration tells the unit the maximum cooling stages allowed to be on during a redline condition.
Configuration→CCN→LDSH→S.MXC
This configuration tells the unit the maximum cooling stages allowed to be on during a loadshed condition.
Configuration→CCN→LDSH→R.MXH
This configuration tells the unit the maximum heating stages allowed to be on during a redline condition.
Configuration→CCN→LDSH→S.MXH
This configuration tells the unit the maximum heating stages allowed to be on during a loadshed condition.
The two Demand Limiting methods can be active simultaneously. The lowest cool and heat stage limits imposed by either method are applied, and these ”effective stage limits” are shown in the points CSTGLIMT (Run Status→COOL→LMT.C) and HSTGLIMT (Run Status→HEAT→LMT.H), respectively. In normal running mode, these limits will prevent stages from being added, or stages to be removed, as applicable. In test mode, these limits are ignored, and the user may continue to operate all stages. The point MODEDMDL (Run Status→MODE→D.LMT) is used to show if any Demand Limiting is in effect that prevents the unit from operating either cooling or heating at full−capacity.
NOTE: MODEDMDL may reflect that staging is NOT limited even though Loadshed is active, or the network points are being forced, if the stage limits in effect are not less than the stages present in the unit.
If a more drastic mode of Demand Limiting is required, the network point HVACDOWN (Run Status→MODE→HV.DN) can be used to prohibit the unit from selecting any HVAC mode, thus preventing the operation of the supply fan, compressors, condenser fans, and heat stages. This point must also be forced, and is reset automatically when not forced, and at POR.
NOTE: HVACDOWN can be used as an immediate shutdown of the unit before limiting capacity (ex. Generator switching).
Linkage
ComfortLink controls do not require any configuration settings to establish linkage with a Linkage Coordinator. This is done automatically when the unit’s bus and element address are configured in the Linkage Coordinator’s LINKAGE configuration table. The linkage information that is supplied to the ComfortLink unit by the Linkage Coordinator is as follows:
Reference zone temperatureReference zone occupied biased heating and cooling set pointsReference zone unoccupied heating and cooling set pointsComposite occupancy mode
The unit will control the equipment based on this information and in return will provide the Linkage Coordinator with the following data:
Operating mode − Cooling, Heating, Free Cooling, Fire
Shutdown Evacuation, or Off
Supply−air temperatureOptimal Start Bias time (Based on worst case zone)
36
This synchronization of data optimizes the efficiency of the unit and the zones to operate at peak system performance at all times. This information can be seen in linkage maintenance tables of the Linkage Coordinator and the RTU; it is updated at approximately 1−minute intervals.
Cooling and heating operation is slightly modified during Linkage control. A PID loop is run to calculate required stages. This is necessary because in stand alone operation, the unit tries to anticipate the space. With Linkage, the unit must try to satisfy the demand as soon as possible. The PID configurations are in Configuration→PID. These values have been field tested and the default values should NOT BE CHANGED.
For information on set up and configuration, see the Space Temperature Control−CCN Linkage text in the Controls Quick Start section of this book.
For additional information on the Linkage Coordinator or Zone Controllers, please refer to their appropriate manuals.
Alarm Handling
There are a variety of different alerts and alarms in the system. Alerts are indicated by TXXX (where XXX is the alert number) on the display and generally signify that the improperly functioning circuit can restart without human interaction. If an alarm occurs, indicated by AXXX (where XXX is the alarm number), the damaged circuit will generally not restart without an alarm reset via the Scrolling Marquee display or CCN.
The response of the control system to various alerts and alarms depends on the seriousness of the particular alert or alarm. In the mildest case, an alert does not affect the operation of the unit in any manner. An alert can also cause a “strike.” A “striking” alert will cause the circuit to shut down for 15 minutes. This feature reduces the likelihood of false alarms causing a properly working system to be shut down incorrectly. If three strikes occur before the circuit has an opportunity to show that it can function properly, the circuit will strike out, causing the shutdown alarm for that particular circuit. Once activated, the shutdown alarm can only be cleared via an alarm reset.
However, circuits with strikes will be given an opportunity to reset their strike counter to zero. As discussed above, a strike typically causes the circuit to shut down. Fifteen minutes later, that circuit will once again be allowed to run. If the circuit is able to run for 1 minute, its replacement circuit will be allowed to shut down (if not required to run to satisfy requested stages). However, the “troubled” circuit must run continuously for a user defined time (Configuration→COOL→RST.C) with no detectable problems before the strike counter will be reset to zero. Default value is 5 minutes.
CCN Alarm Broadcast
Operators of CCN networks might not want to be notified of “striking” alerts for refrigerant circuits until the circuit has been shut down due to 3 strikes. Set the cooling configuration of Alert Each Strike (Configuration→COOL→ALM.N on display, ALM_NOW on CCN) to YES to broadcast each circuit strike alert. Set Alert Each Strike to NO to broadcast only circuit shut down. Alert Each Strike configuration is ignored during Service Test and all alerts are broadcast.
Alarm Relay Output
The alarm relay output is a normally open 24 vac output between field connection terminal board terminals C and X. Selection of which alerts and alarms will result in closing of the alarm relay may be set in the Alarm Relay Configuration (Configuration→ALM.O). Setting a configuration to YES will result in the alarm output relay, ALRM, status of ON and 24 vac between C and X when that particular condition is in an alarm state. Setting a configuration to NO will result in no action by the alarm output relay for that particular condition.
NOTE: An accessory filter switch can be used along with the alarm relay output function to indicate dirty filter service need.
See the Troubleshooting section for more information on viewing, diagnosing, and clearing alerts and alarms.
TROUBLESHOOTING
The Scrolling Marquee display shows the actual operating conditions of the unit while it is running. If there are alarms or there have been alarms, they will be displayed in either the current alarm list or the history alarm list. (See Table 14.) The Service Test mode allows proper operation of the compressors, fans, and other components to be checked while the unit is not operating. See Service Test.
Complete Unit Stoppage
There are several conditions that can cause the unit not to provide heating or cooling:
If an alarm is active which causes the unit to shut down,
diagnose the problem using the information provided in Alarms and Alerts section below.
Cooling and heating loads are satisfied.Programmed occupancy schedule.General power failure.Tripped CB1, CB2, or CB3 (24-volt transformer circuit
breakers).
Blown fuse (FU1−4)Unit is turned off through the CCN network.If supply-air temperature is less than the Minimum SAT Lower
Level (SAT.L) configuration value, unit cannot cool.
If outdoor-air temperature is less than the Compressor Lockout
Temperature (CA.LO, CB.LO, CC.LO) configuration value, unit cannot cool.
If outdoor-air temperature is greater than the Heating Lockout
Temperature (HT.LO) configuration value, unit cannot heat.
Restart Procedure
Alarms and Alerts
Viewing and Clearing Unit Alarms
Presence of active alarms will be indicated on the Scrolling Marquee display by the Alarm Status light turning on and by the number of active alarms being displayed in the automatic View of Run Status. Presence of active alarms may also be signaled on the Alarm Output terminals. Each alarm may also be broadcast on the CCN network. Active alarms and past alarm history can be reviewed and cleared via the local display or a CCN device. The following menu locations are used for the local display:
Alarms"R.CURR (Reset All Current Alarms)
Change to YES to reset all active alarms. Turning unit power off will also reset all current alarms.
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Alarms"R.HIST (Reset Alarm History)
Change to YES to reset the alarm history. Turning unit power off will not reset the alarm history.
Alarms"CURR (Currently Active Alarms)
Use the ENTER key, then scroll through any alarm numbers using the up and down arrow keys. Alarms are displayed in numerical order.
Alarms"HIST (Alarm History)
Use the ENTER key, then scroll through any alarm numbers using the up and down arrow keys. Up to 20 alarms are displayed in order of occurrence, with time and date.
The description for an alarm can be viewed on the Scrolling Marquee display by pressing ESCAPE and ENTER keys simultaneously while displaying the alarm code number. Be sure to expand description for each code, because in some cases there are different possible descriptions and causes for the same code number.
Diagnostic Alarm Codes and Possible Causes
Alert Codes T051, T052, T055 and T059
There are 4 different texts for each alert code. There are two different alerts which have corresponding test mode alerts indicated
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with “Service Test” in the expanded text. Pressing enter and esc on the marquee or navigator to expand the T051, T052, T055, or T059 alert will show you one of the below alerts. Make sure the expanded text is read correctly before troubleshooting. Alert codes T051, T052, T055, and T059 are for compressors A1, A2, B1, and C1, respectively.
Compressor Safety Trip
These alerts occur when the Current Sensor (CS) does not detect
compressor current during compressor operation. When this
occurs, the control turns off the compressor and logs a strike for
the respective circuit. These alerts reset automatically. The
possible causes are: high−pressure switch (HPS) open (The HPS
is wired in series with compressor relays on the MBB. If the
high−pressure switch opens during compressor operation, the
compressor stops, and the CS no longer detects current, causing
the control to activate this alert), compressor internal protection
is open, or a wiring error (a wiring error might not allow the
compressor to start).
To check out the alert:
1. Turn on the compressor in question using Service Test mode. If the compressor does not start, then most likely the problem is one of the following: HPS open, open internal protection, incorrect safety wiring, or incorrect compressor wiring.
2. If the compressor starts, verify that the indoor and outdoor fans are operating properly.
3. If the CS is always detecting current, then verify that the compressor is on. If the compressor is on, check the contactor and the relay on the MBB. If the compressor is off and there is no current, verify CS wiring and replace if necessary.
4. Return to Normal mode and observe compressor operation to verify that compressor current sensor is working and condenser fans are energized after compressor starts.
Compressor Current Detected After Turnoff
These alerts occur when the Current Sensor (CS) detects current
when the compressor should be off. When this occurs, the
control turns off all of the compressors. Use the Scrolling
Marquee to reset the alert. The possible causes are a welded
contactor or frozen compressor relay on MBB.
To check out alert:
1. Place the unit in Service Test mode. All compressors should be Off.
2. Verify that there is not 24vac at the contactor coil. If there is 24vac at the contactor, check relay on MBB and wiring.
3. Check for welded contactor.
4. Verify CS wiring.
5. Return to Normal mode and observe compressor operation to verify that compressor current sensor is working and condenser fans are energized after compressor starts.
Alert Codes T064, T065 and T080 – Circuit Saturated Condensing Temp Thermistor Failure
Alert codes T064, T065, and T080 are for circuits A, B and C, respectively. These alerts occur when the temperature is outside the range –40 to 240F (–40 to 116C). When this occurs, the control will use only the outdoor temperature to control the outdoor fans. If both the SCT and OAT fail, then circuit shutdown alarm will occur also. The cause of the alert is usually a faulty thermistor, a shorted or open thermistor caused by a wiring error, or a loose connection.
Alert Code T066, T067, and T081 − Circuit Saturated Suction Temperature Thermistor Failure
Alert codes T066, T067, and T081 are for circuits A, B and C, respectively. These alerts occur when the unit’s suction transducers are turned off internally. Cooling will not operate. This is usually due to a network force on a non exposed CCN point. Reload factory defaults or reinstall software on the MBB. Consult the network manager if alert continues.
Alert Code T073 − Outdoor Air Temperature Thermistor Failure
This alert occurs when the temperature is outside the range –40 to 240F (–40 to 116C). For all units, all ambient temperature lockout limits for cooling and heating are ignored. For all units, if both SCT and OAT fail, then circuit shutdown alarm will also occur. For economizer equipped units, the economizer will not operate to provide cooling. The economizer will still operate for ventilation. The control will use condenser temperatures for outdoor fan control. For units with CCH crankcase heat relay control, the crankcase heat relay will be turned on if any compressor is off. This alert resets automatically. The cause of the alert is usually a faulty thermistor, a shorted or open thermistor caused by a wiring error, or a loose connection.
Alert Code T074 − Space Temperature Thermistor Failure
This alert occurs when the temperature is outside the range –40 to 240F (–40 to 116C). This alert will only occur if the unit control type is configured for Space Sensor (versus Thermostat). Cooling and heating will not operate. For economizer equipped units, the economizer will still operate for ventilation. This alert resets automatically. The cause of the alert is usually a faulty thermistor in the T−55, T−56, or T−58 device, a shorted or open thermistor caused by a wiring error, or a loose connection.
38
Alert Code T075 − Supply Air Temperature Thermistor Failure
This alert occurs when the temperature is outside the range –40 to 240F (–40 to 116C). Economizer cooling and adaptive compressor staging cannot occur while this alarm is active. This alert resets automatically. The cause of the alert is usually a faulty thermistor, a shorted or open thermistor caused by a wiring error, or a loose connection.
Alert Code T076 − Return Air Thermistor Failure
This alert occurs when the temperature is outside the range –40 to 240F (–40 to 116C). This alert will only occur if the unit is configured for a return air sensor. Economizer differential dry bulb control will not be allowed during this alert. This alert resets automatically. The cause of the alert is usually a faulty thermistor, a shorted or open thermistor caused by a wiring error, or a loose connection.
Alert Code T077 − Space Relative Humidity Sensor Failure
This alert occurs when the input is less than 3.5 mA and the sensor is configured as installed. If a humidistat is not installed, then dehumidification will not be functional. Check sensor and wiring. This alert clears automatically.
NOTE: An ECB must be installed to use the space relative humidity sensor.
Alert Code T080 − Circuit C Saturated Condensing Temp Thermistor Failure
See Alert T064
Alert Code T081 − Circuit Saturated Suction Temperature Thermistor Failure
See Alert T066
Alert Codes T092, T093, T101 – Circuit Suction Pressure Transducer Failure
Alert codes T092, T093, and T101 are for circuits A, B and C, respectively. These alerts occur when the board does not properly read the transducer voltage. A circuit cannot run when this alert is active. Use the Scrolling Marquee to reset the alarm. The cause of the alert is usually a faulty transducer, faulty 5−v power supply, or a loose connection.
Alert Codes T102, T103, and T104 − Compressor Current Sensor Failure
Alert codes T102, T103, and T104 are for compressors A1 and A2, B1 and C1, respectively. These alerts occur when the output of the current sensor (CS) is a constant high value. These alerts reset automatically. The cause of the alert is a wiring error or a loose connection. If the problem cannot be resolved and the CS board must be replaced, the CS board can be temporarily disabled while securing a replaced board. A CS board is disabled by setting the corresponding configuration to DISABLE (Configuration→COOL→CIR.A→CS.A1, CS.B1 or CS.C1).
Alert Codes T110, T111, and T140 – Circuit Loss of Charge
Alert codes T110, T111, and T140 are for circuits A, B and C, respectively. These alerts have “Service Test” text that will be displayed if the alert occurred during service test. These alerts occur when the compressor is OFF and the suction pressure is less than 5 psig and OAT is greater than –5F for 1 continuous minute. Use the Scrolling Marquee to reset the alert. The cause of the alert is usually low refrigerant pressure or a faulty suction pressure. These alerts only occur when the compressor is OFF because the low refrigerant pressure alarms (alerts T133, T134 and T141) handle this situation when the compressor is operating.
Alert Codes T126, T127 and T142 − Circuit High Discharge Pressure
Alert codes T126, T127, and T142 are for circuits A, B and C, respectively. These alerts have “Service Test” text that will be displayed if the alert occurred during service test. These alerts occur when alerts T051, T055, or T059 are active while the appropriate condensing temperature is greater than 150F. These alerts reset automatically. The cause of the alert is usually an overcharged system, high outdoor ambient temperature coupled with dirty outdoor coil, plugged filter drier, or a faulty high−pressure switch. See Alerts T051, T055 and T059 for diagnostic procedure.
Alert Codes T133, T134 and T141 − Circuit Low Refrigerant Pressure
Alert codes T133, T134 and T141 are for circuits A, B and C, respectively. These alerts have “Service Test” text that will be displayed if the alert occurred during service test. These alerts occur when the compressor is operating and the evaporating temperature (converted from the suction pressure) is less than configured low suction control levels, Configuration→COOL→SST→SST.1 (Low Suction — Level 1) or SST.2 (Low Suction — Level 2) or SST.3 (Low Suction Level
3). The circuit SST value must be less than SST.1 (for 5 minutes), SST.2 (for 4 minutes), or SST.3 (for 3 minutes when using the economizer and 1.5 minutes when not using the economizer) for the alert to occur. When the outdoor temperature is less than 40F, the above values are reduced 1F for every 2F the OAT is below 40F. An alert will also occur if the circuit SST value is less than SST.3 –5F for 20 seconds and the outdoor temperature is above 40F. All the above timers will reset if the suction temperature rises above SST.O for 1 minute. These alerts cause a strike for the respective circuit. If the OAT is less than 10F, the circuit will shut down without a strike. These alerts will activate when the coil becomes frosted. However, during the 15−minute reset period, the coils will thaw and strike should clear at restart if there is nothing else wrong with the circuit. The alert resets automatically. The cause of the alert is usually low refrigerant charge, dirty filters, evaporator fan operating backwards, loose or broken belt, plugged filter drier, faulty transducer, excessively cold return air, or stuck open economizer when the ambient temperature is low.
Alert Codes T140 − Circuit C Loss of Charge
See Alert T110.
Alert Codes T141 – Circuit C Low Refrigerant Pressure
See Alert T133.
Alert Codes T142 – Circuit High Discharge Pressure
See Alert T126.
Alert Codes T143, T144 − Circuit Failure to Pressurize
Alert codes T143, T144, and T145 are for circuits A, B, and C, respectively. These alerts have “Service Test” text that will be displayed if the alert occurred during service test. These alerts occur when the compressor turns on and the suction pressure does not drop at least 10 PSIG and stay there for the first 20 seconds AND the condensing temperature does not rise at least 5F and stay there for the first 65 seconds (both conditions have to occur). These alerts cause a strike for the respective circuit. The alert resets automatically. The cause of the alert is usually compressor wiring causing reverse rotation or a faulty compressor.
48/50PG and PM
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Alarm Code T153 − Real Time Clock Hardware Failure
The alert occurs when the RTC clock chip on the MBB is not responding. Time and date functions will not operate, such as local occupancy schedules. The unit will default to 24/7 unoccupied mode. Recovery is automatic but MBB board replacement may be necessary. Cycling power to the control and reconfiguring the time and date should be tried before board replacement.
Alarm Code A154 − Serial EEPROM Hardware Failure
The unit will completely shut down. The serial EEPROM chip on the MBB which stores the unit’s configuration is not responding. Recovery is automatic, but MBB board replacement may be necessary. Cycling the power to the control should be tried before board replacement.
Alarm Code T155 − Serial EEPROM Storage Failure Error
Configuration data in the serial EEPROM chip can not be verified. The unit will run to last know good values or defaults, and therefore operating errors may occur. Recovery is automatic but MBB board replacement may be necessary. Cycling power to the control and reconfiguring the control points should be tried before board replacement.
Alarm Code A156 − Critical Serial EEPROM Storage Fail Error
48/50PG and PM
Configuration→COOL→N.CIR (Number of Circuits) Configuration→COOL→N.A(Compressors on Circuit A) Configuration→COOL→OFC→OFC.3 (OFC.3 Enable, CCH
Disable)
Configuration→HMZR→REHT (Humidi−MiZer Equipped) Configuration→HMZR→RH.FN (Reheat Fan Control)
Alarm Code A157 − A/D Hardware Failure
The unit will completely shut down. The analog to digital conversion chip on the MBB has failed. Recovery is automatic but MBB board replacement may be necessary. Cycling power to the control should be tried before board replacement.
Alarm Codes A163, A164, and A165 − Circuit Down due to Failure
Alarm codes A163, A164, and A165 are for circuits A, B, and C, respectively. These alarms have “Service Test” text that will be displayed if the alarm occurred during service test. These alarms occur when a circuit has 3 strikes. Use the Scrolling Marquee display to reset the alarm. Investigate the alarm that caused the strikes to occur.
Alert Code T173 – Loss of Communication with the Energy Management Module
This alert occurs when the MBB cannot communicate with the EMM. These units do not currently support any operation with the EMM. This alert is caused by an internal force to look for the EMM board. When this happens, reload software on the MBB and do not restore configurations, the factory configurations must be used at first. Replace the MBB if alert continues.
Alert Code T179 – Loss of Communication with the Economizer Control Board
This alert occurs when the MBB cannot communicate with the ECB. Economizer operation will be disabled. This is usually caused by a wiring problem. If a relative humidity sensor is installed and configured but there is not an ECB installed on the unit, this alert will be generated (the ECB is required for RH sensor operation). Investigate using the Low Voltage Schematic, check that the ECB address is correct, and verify the resistance between pins on the LEN connections.
Alert Code T180 − Loss of Communication with the Economizer Actuator
Alert Code T181 – Loss of communication with Outside Air Unit
This alert occurs when the Outdoor Air Unit Type (Configuration → OAU → OA.TY) is not set to 0 and the OAU Operating Mode (Run Status → OAU → OA.OP) has not been communicated in the past 3 minutes. The control will reset all OAU data. This alert will automatically reset when communication is established again. This alert is usually caused by a wiring problem or a problem with the OAU communication.
Alarm Code A200 − Linkage Timeout − Comm Failure
This alarm occurs when the MBB fails to communicate with a Linkage device. This only occurs when the MBB has previously communicated with a Linkage device since last power cycle. If a back up sensor was not installed the T074 alert will occur shortly after this one. Reset power to the unit and verify Linkage is communicating.
Alarm Code A404 − Fire Shutdown
This alarm occurs when the shutdown input is either open or closed depending upon its configuration. This alarm is usually caused by an auxiliary device that is trying to shut down the unit, e.g., smoke detector. The configuration for this switch input can be found at variable Configuration→UNIT→FS.SW. Verify that the configuration is set correct, verify the wiring and auxiliary device. This alarm resets automatically.
Alert Code T408 − Dirty Air Filter
This alert occurs when the Filter Status switch senses a plugged filter for 120 continuous seconds after the indoor fan has been running for 10 seconds. Because the Dirty Air Filter switch can be configured normally opened or closed, the switch might be open or closed. The configuration for this switch input can be found at variable Configuration→UNIT→FL.SW. Verify that the configuration is set correct, verify the wiring and filter status switch. The hose should be connected to the low side of the switch. This alert resets automatically.
Alert Code T409
There are 2 different texts for this alert code. Pressing enter and esc on the marquee or navigator to expand the T409 alert will show you one of the below alerts. Make sure the expanded text is read correctly before troubleshooting.
Fan Status Switch On, Fan Contactor Off
This alarm occurs when the fan status switch has sensed that the indoor fan has been on for 10 seconds and the indoor fan feedback has determined that the indoor fan should be off. Because the Fan Status switch can be configured normally opened or closed, the switch might be open or closed. The configuration for this switch input can be found at Configuration→UNIT→FN.SW. Verify that the configuration is set correctly. Verify the wiring and fan status switch. The hose should be connected to the high side of the switch. If the IDF is configured to shut down the unit when this alarm occurs (Configuration→UNIT→IDF.F = YES), then this alarm can only be reset manually and the unit is shut down. If the IDF is not configured to shut the unit down when this alarm occurs (IDF.F = NO), then this alarm resets automatically and no specific control action is taken.
40
Table 12 – ComfortLinkt Alarm Codes
ALARM
OR
ALERT
NUMBER
T051
T052
T055
T059
T064
T065
T066
T067
T073 Outdoor Air Temperature Thermistor Failure No cooling with economizer Automatic
T074 Space Temperature Thermistor Failure
T075 Supply Air Temperature Thermistor Failure
T076 Return Air Thermistor Failure
T077 Space Relative Humidity Sensor Failure
T080
T081
T092 Circuit A Suction Pressure Transducer Failure Lockout Circuit A Manual
T093 Circuit B Suction Pressure Transducer Failure Lockout Circuit B Manual
T101 Circuit C Suction Pressure Transducer Failure Lockout Circuit C Manual
T102 Compressor A1 Current Sensor Failure
T103 Compressor B1 Current Sensor Failure
T104 Compressor C1 Current Sensor Failure
T110
T111
T126
T127
T133
T134
T140
T141
T142
T143
T144
T145
T153 Real Timeclock Hardware Failure
Compressor A1 Safety Trip Service Test - Compressor A1 Safety Trip Compressor A1 Current Detected After Turnoff
After Turnoff Compressor A2 Safety Trip Service Test - Compressor A2 Safety Trip Compressor A2 Current Detect After Turnoff
After Turnoff Compressor B1 Safety Trip Service Test - Compressor B1 Safety Trip Compressor B1 Current Detect After Turnoff Turn off all compressors Automatic
After Turnoff Compressor C1 Safety Trip Service Test - Compressor C1 Safety Trip Compressor C1 Current Detect After Turnoff
After Turnoff Circuit A Saturated Condensing Temp Thermistor Failure Circuit B Saturated Condensing Temp Thermistor Failure Circuit A Saturated Suction Temperature Thermistor Failure Circuit B Saturated Suction Temperature Thermistor Failure
Circuit C Saturated Condensing Temp Thermistor Failure Circuit C Saturated Suction Temperature Thermistor Failure
Compressor A2 Current Sensor Failure
Circuit A Loss of Charge Service Test - Circuit A Loss of Charge Circuit B Loss of Charge Service Test - Circuit B Loss of Charge
Circuit A High Discharge Pressure
Service Test - Circuit A High Discharge Pressure
Circuit B High Discharge Pressure
Service Test - Circuit B High Discharge Pressure
Circuit A Low Refrigerant Pressure
Service Test - Circuit A Low Refrigerant Pressure
Circuit B Low Refrigerant Pressure
Service Test - Circuit B Low Refrigerant Pressure
Circuit C Loss of Charge Service Test - Circuit C Loss of Charge
Circuit C Low Refrigerant Pressure
Service Test - Circuit C Low Refrigerant Pressure
Circuit C High Discharge Pressure
Service Test - Circuit C High Discharge Pressure Circuit A Failure To Pressurize
Service Test - Circuit A Failure to Pressurize Circuit B Failure To Pressurize Service Test - Circuit B Failure to Pressurize Circuit C Failure To Pressurize Service Test - Circuit C Failure to Pressurize
DESCRIPTION
* See Legend on next page
ACTION TAKEN BY
CONTROL
Add Strike for Circuit A Automatic
Turn off all compressors Automatic Welded contactorService Test - Compressor A1 Current Detected
Add Strike for Circuit A Automatic
Turn off all compressors Automatic Welded contactorService Test - Compressor A2 Current Detected
Add Strike for Circuit B Automatic
Add Strike for Circuit C Automatic
Turn off all compressors Automatic Welded contactorService Test - Compressor C1 Current Detected
Use OAT to control Outdoor
Use OAT to control Outdoor
No cooling with economizer
and No adaptive compressor
differential Dry Bulb control
Use OAT to control Outdoor
If CS.A1 = Enable, then no
If CS.A2 = Enable, then no
If CS.B1 = Enable, then no
If CS.C1 = Enable, then no
No time and date schedule
fans
fans
No Circuit A Cooling Automatic Circuit A Suction transducer internally forced inactive
No Circuit B Cooling Automatic Circuit B Suction transducer internally forced inactive
If U.CTL = 3, then no
heating or cooling
staging
If RAT.S = Yes, then no
If RH.S = Yes, then no
indoor humidity control
fans
No Circuit C Cooling Automatic Circuit C Suction transducer internally forced inactive
T051 current alarm
T052 current alarm
T055 current alarm
T059 current alarm
Lockout Circuit A Manual Low refrigerant or faulty suction pressure transducer
Lockout Circuit B Manual Low refrigerant or faulty suction pressure transducer
Shutdown Circuit A Automatic
Shutdown Circuit B Automatic
Add Strike for Circuit A Automatic
Add Strike for Circuit B Automatic
Lockout Circuit C Manual Low refrigerant or faulty suction pressure transducer
Add Strike for Circuit C Automatic
Shutdown Circuit C Automatic
Add Strike for Circuit A Automatic Wiring causing reverse rotation or faulty compressor
Add Strike for Circuit B Automatic Wiring causing reverse rotation or faulty compressor
Add Strike for Circuit C Automatic Wiring causing reverse rotation or faulty compressor
operation
RESET
METHOD
High-pressure switch open. Compressor internal protection open. Wiring error
High-pressure switch open. Compressor internal protection open. Wiring error
High-pressure switch open. Compressor internal protection open. Wiring error
Welded contactorService Test - Compressor B1 Current Detected
High-pressure switch open. Compressor internal protection open. Wiring error
Automatic
Automatic
Automatic
Automatic
Automatic
Automatic
Automatic
Automatic
Automatic
Automatic
Automatic
Automatic No time/date configured, software failure, or MBB failure
Faulty, shorted, or open thermistor caused by wiring error or loose connection. Faulty, shorted, or open thermistor caused by wiring error or loose connection.
Faulty, shorted, or open thermistor caused by wiring error or loose connection. Faulty, shorted, or open thermistor caused by wiring error or loose connection.
Faulty, shorted, or open thermistor caused by wiring error or loose connection.
Faulty, shorted, or open thermistor caused by wiring error or loose connection. Faulty, shorted, or open sensor caused by wiring error or loose connection. Faulty, shorted, or open thermistor caused by wiring error or loose connection.
Faulty transducer, faulty 5-V power supply, or loose connection Faulty transducer, faulty 5-V power supply, or loose connection Faulty transducer, faulty 5-V power supply, or loose connection Faulty current sensor caused by wiring error or loose connection Faulty current sensor caused by wiring error or loose connection Faulty current sensor caused by wiring error or loose connection Faulty current sensor caused by wiring error or loose connection
An overcharged system, high outdoor ambient temperature coupled with dirty outdoor coil, plugged filter drier, or a faulty high-pressure switch. An overcharged system, high outdoor ambient temperature coupled with dirty outdoor coil, plugged filter drier, or a faulty high-pressure switch.
Low refrigerant charge, dirty filters, evaporator fan turning backwards, loose or broken fan belt, plugged filter drier, faulty transducer, excessively cold return air, or stuck open economizer when the ambient temperature is low. Low refrigerant charge, dirty filters, evaporator fan turning backwards, loose or broken fan belt, plugged filter drier, faulty transducer, excessively cold return air, or stuck open economizer when the ambient temperature is low.
Low refrigerant charge, dirty filters, evaporator fan turning backwards, loose or broken fan belt, plugged filter drier, faulty transducer, excessively cold return air, or stuck open economizer when the ambient temperature is low. An overcharged system, high outdoor ambient temperature coupled with dirty outdoor coil, plugged filter drier, or a faulty high-pressure switch.
PROBABLE CAUSE
48/50PG and PM
41
ALARM
OR
ALERT
NUMBER
A154 Serial EEPROM Hardware Failure Unit Shutdown Automatic Software failure or MBB failure
T155 Serial EEPROM Storage Failure Error Unit operation errors Automatic Software failure or MBB failure A156 Critical Serial EEPROM Storage Fail Error Unit Shutdown Automatic Software failure or MBB failure A157 A/D Hardware Failure Unit Shutdown Automatic Software failure or MBB failure
A163
A164
A165
T173
T179
T180
T181 Loss of communication with Outside Air Unit Reset OAU data Automatic Wiring Problem or OAU communication failure
A200 Linkage Timeout Error - Comm Failure
A404 Fire Shutdown Unit Shutdown Automatic Smoke detected by smoke detector
T408 Dirty Air Filter Alert Generated Automatic Dirty Filter
48/50PG and PM
T409
T410
T411 Thermostat Y2 Input Activated without Y1 Activated
T412
T413
T414
T415 IAQ Input Out of Range No IAQ Operations Automatic Bad sensor, bad wiring, or sensor configured incorrectly.
T416 OAQ Input Out of Range No OAQ Operations Automatic Bad sensor, bad wiring, or sensor configured incorrectly.
T418
LEGEND
ECB - Economizer Control Board IGC - Integrated Gas Controller MBB - Main Base Board OAT - Outdoor-Air Thermistor
Table 12 — ComfortLinkt Alarm Codes (cont)
DESCRIPTION
Circuit A Down Due to Failure Service Test - Circuit A Down Due to Failure Circuit B Down Due to Failure Service Test - Circuit B Down Due to Failure Circuit C Down Due to Failure Lockout Circuit C Manual Circuit has 3 strikes or has been locked out by another alarm Service Test - Circuit C Down Due to Failure Loss of communication with the Energy
Management Module Loss of communication with the Economizer Control Board Loss of communication with the Economizer Actuator
Fan Status Switch ON, fan commanded off
Fan Status Switch OFF, fan commanded on
R-W1 Jumper Not Installed in Space Temp Mode Unable to run heat Automatic Missing jumper wire R-W1 Jumper Must Be Installed to Run Heat In
Service Test
Thermostat W2 Input Activated without W1 Activated Thermostat Y and W Inputs Activated Simultaneously
Economizer Damper Actuator Out of Calibration Alert Generated Automatic
Economizer Damper Actuator Torque Above Load Limit
Economizer Damper Actuator Hunting Excessively Alert Generated Automatic Damper position changing too quickly.
Economizer Damper Stuck or Jammed Alert Generated Automatic
Economizer Damper Actuator Mechanical Failure Alert Generated Automatic Check actuator and replace if necessary. Economizer Damper Actuator Direction Switch
Wrong
OAU Motor Failure Alert generated Automatic Check OAU motors for failure OAU Dirty Filter Alert generated Automatic Check/change OAU filters OAU Low CFM Alert generated Automatic Check OAU air flow OAU General Alarm Alert generated Automatic Check OAU
ACTION TAKEN BY
CONTROL
Lockout Circuit A Manual Circuit has 3 strikes or has been locked out by another alarm
Lockout Circuit B Manual Circuit has 3 strikes or has been locked out by another alarm
No action Automatic MBB Software failure, reload software or replace board
No economizer operation Automatic Communication wiring problem with ECB or faulty MBB or ECB
No economizer operation Automatic Communication wiring problem with actuator.
No Linkage Operation fall
back to local SPT
If IDF.F = Yes, then Unit
Shutdown
If IDF.F = Yes, then Unit
Shutdown
Unable to Test Heat Outputs Automatic Missing jumper wire
Run unit as if Y2 and Y1 are
Run unit as if W2 and W1 are
Run unit in mode activated
On
On
first
Alert Generated Automatic Actuator load too high. Check damper load.
Alert Generated Automatic Actuator direction control switch (CCW, CW) wrong.
RESET
METHOD
Automatic
If IDF.F = YES, then
Manual,
otherwise
automatic
If IDF.F = YES, then
Manual,
otherwise
automatic
Automatic Bad Thermostat or Thermostat Wiring
Automatic Bad Thermostat or Thermostat Wiring
Automatic Bad Thermostat or Thermostat Wiring
Received a table write from Linkage before, now not receiving any linkage commands
Bad Fan Status Switch. Configuration incorrect.
Tripped Circuit Breaker. Broken belt. Bad indoor fan motor. Configuration incorrect. Bad fan status switch.
Calibrate economizer (E.CAL). If problem still exist then determine what is limiting economizer rotation.
No economizer motion. Check damper blades, gears, and actuator.
PROBABLE CAUSE
42
Fan Status Switch Off, Fan Contactor On
This alert occurs when the fan status switch has sensed that the
indoor fan has been off for 10 seconds and the indoor fan
feedback has determined that the indoor fan should be on.
Because the Fan Status switch can be configured normally
opened or closed, the switch might be open or closed. The
configuration for this switch input can be found at Configuration→UNIT→FN.SW. Verify that the configuration
is set correctly. Verify the wiring and fan status switch. The hose
should be connected to the high side of the switch. If the IDF is
configured to shut down the unit down when this alert occurs (Configuration→UNIT→IDF.F = YES), then this alarm can
only be reset manually and the unit is shut down. If the IDF is
not configured to shut the unit down when this alert occurs
(IDF.F = NO), then this alert resets automatically and no specific
control action is taken.
Alert Code T410
R−W1 Jumper Not Installed in Space Temp Mode
This alert occurs when the control mode is Space Temperature
mode via Auto Select or Space Temp Select, yet there is no
power to W1. Verify that space temperature mode is the desired
mode or add jumper between R and W1. This alert resets
automatically.
R−W1 Jumper Must be Installed to Run Heat in Service Test
This alert occurs when a request for a heat output has occurred
yet the W1 input is not high. A jumper must be installed
between R and W1 when trying to test heat in Service Test. The
alert will clear when Service Test is exited or if another Service
Test mode is selected. Remove jumper when done using Service
Test if the unit is operating with a thermostat. The jumper should
only be left in place if the unit is operating with a space
temperature probe.
Alert Code T411 − Thermostat Y2 Input Activated without Y1 Activated
This alert occurs in Thermostat mode when Y2 is energized and Y1 is not. Verify thermostat and thermostat wiring. When Y2 turns On, the software will behave as if Y1 and Y2 are both On. When Y2 turns Off, the software will behave as if Y1 and Y2 are both Off. This alert resets automatically when Y1 is turned On.
Alert Code T412 – Thermostat W2 Input Activated without W1 Activated
This alert occurs in Thermostat mode when W2 is energized and W1 is not. Verify thermostat and thermostat wiring. When W2 turns On, the software will behave as if W1 and W2 are both On. When W2 turns Off, the software will behave as if W1 and W2 are both Off. This alert resets automatically when W1 is turned On.
Alert Code T413 – Thermostat Y and W Inputs Activated Simultaneously
This alert occurs in Thermostat mode when Y1 or Y2 is energized simultaneously with W1 or W2. Verify thermostat and thermostat wiring. The software will enter either the cooling or heating mode depending upon which input turned on first. This alert resets automatically when Y1 and Y2 are not on simultaneously with W1 and W2.
Alert Code T414
There are 6 different alerts under this one alert code. Pressing enter and esc on the marquee or navigator to expand the T414 alert will show you one of the below alerts. All these alerts are generated by the Belimo actuator and reported to the ECB. These alerts can only occur if the ECB is controlling the actuator digitally through MFT.
Economizer Damper Actuator Out of Calibration
This alert occurs when the economizer actuator reports a control angle (Operating Modes→ECON→C.ANG) less than the minimum control angle (Configuration→ECON→M.ANG). Initiate economizer calibration (Service Test→INDP→E.CAL)
using the Service Test menu. The economizer calibration
procedure will try to find new maximum open and closed
positions. If the alert does not clear automatically after the
calibration procedure is complete, investigate what is limiting
economizer rotation. After that step, run another calibration, but
first power off unit (spring return the damper), loosen the
actuator clamp, and while pushing the damper closed, tighten the
clamp. This alert resets automatically.
Economizer Damper Actuator Torque Above Load Limit
This alert occurs when the actuator load is too high. Investigate
to determine what is increasing damper load, and verify that the
actuator is the correct size for the unit. This alert resets
automatically.
Economizer Damper Actuator Hunting Excessively
This alert occurs when the commanded damper position is
changing too rapidly. The stop jog ratio must be less than 21%
to clear this alert. Leave the actuator powered with no signal for
a few hours to allow the ratio to decrease (may have to wait
longer than a few hours). If the alert continues, determine if the
ECB or actuator is bad. This alert resets automatically.
Economizer Damper Stuck or Jammed
This alarm occurs when the actuator is no longer moving and the
actual position is greater than or less than 3% of the commanded
position for 20 seconds. Investigate what is stopping the rotation
of the actuator and fix. This alert resets automatically.
Economizer Damper Actuator Mechanical Failure
This alert occurs when the actuator senses a catastrophic failure.
Investigate actuator and replace if necessary. This alert resets
automatically.
Economizer Damper Actuator Direction Switch Wrong Position
This alert occurs when the economizer damper direction switch
is in the wrong position. The direction switch should be in the
clockwise position and the actuator should be mounted so that
the CW face of the actuator is accessible. Correct if necessary.
This alert clears automatically.
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43
Alert Code T415 − IAQ Input Out of Range
This alert occurs when the IAQ input (on ECB) is less than 3.5 mA and the sensor is configured as installed. IAQ operation will be disabled. Check sensor and wiring. This alert clears automatically.
Alert Code T416 − OAQ Input Out of Range
This alert occurs when the OAQ input (on ECB) is less than 3.5 mA and the sensor is configured as installed. OAQ operation will be disabled. Check sensor and wiring. This alert clears automatically.
Alert Code T418
There are 4 different alerts under this one alert code. Pressing enter and esc on the marquee or navigator to expand the T418 alert will show you one of the below alerts. All these alerts are generated by the OAU device and reported to the MBB. These alerts can only occur if the Outdoor Air Unit Type (Configuration → OAU → OA.TY) is not set to 0. Control action is only taken on the OAU side and these alerts will reset automatically when the OAU clears them. Refer to the EnergyXv2 Supplement Installation Instructions for more information on these alarms.
OAU Motor Failure
This alert occurs when the OAU Motor Failure Alarm (Operating
48/50PG and PM
Modes → OAU → ALM.1) is on. This is usually due to motor status reporting a failure on the OAU.
OAU Dirty Filter
This alert occurs when the OAU Dirty Filter Alarm (Operating Modes → OAU → ALM.2) is on. This is usually due to filter
status reporting a dirty filter on the OAU.
OAU Low CFM
This alert occurs when the OAU Low CFM Alarm (Operating Modes → OAU → ALM.3) is on. This is usually due to OAU not
capable of achieving proper CFM.
OAU General Alarm
This alert occurs when the OAU Alarm (Operating Modes → OAU → ALM.4) is on. Refer to the specific OAU documentation
for details.
Control Module Communication
Red LED
Proper operation of the MBB and ECB control boards can be visually checked by looking at the red status LEDs. When operating correctly, the red status LEDs should blink in unison at a rate of once every 2 seconds. If the red LED on the ECB is not blinking, check the DIP switch positions on the board. If the red LEDs are not blinking in unison, verify that correct power is being supplied to all modules. A blinking red LED at the rate of once per second means that software is not loaded on the board. Also, be sure that the board is supplied with the current software. If necessary, reload current software. A board LED that is lit continuously should be replaced.
Green LED
The MBB and ECB each have one green LED. The Local Equipment Network (LEN) LED should always be blinking whenever power is on. If LEN LED is not blinking, check LEN connections for potential communication errors (MBB J3, J4, and J5). Communication between modules is accomplished by a 3-wire sensor bus. These 3 wires run in parallel from module to module. The J4 connector on the MBB also provides both power and communication directly to the Scrolling Marquee display. The J5 connector on the MBB provides a LEN interface at the field connection terminal (TB).
Yellow LED
The MBB has one yellow LED which is used to indicate CCN communication activity. The Carrier Comfort Network (CCN) LED will blink during times of network communication.
Communication Failures
If the Scrolling Marquee or Navigator display Communication Failure or the green or yellow LED’s do not flash on the boards then the problem could be the communication chip on one of the control boards (MBB or ECB). Disconnect all the LEN and CCN plugs from the board and use an ohm meter to measure the resistance on the communication pins of the boards to determine if the board is bad. If the reading is less than half the value indicated in Table 13, then the board needs to be replaced.
NOTE: The resistive values should be read when the board is powered off and the unit is locked out.
Device
MBB
ECB
Board Serial
Number
Prior to 4702N
Starting 4702N
Prior to 0803N
Starting 0803N
Table 13 – LEN and CCN Communication Resistances
(LEN) Resistance between Pins/Connector (CCN) Resistance between Pins/Connector
Pins 1 to 3 Pins 1 to 2 Pins 2 to 3 Pins 5 to 7 Pins 5 to 6 Pins 6 to 7
15K Ω
J3, J4, & J5
18.9K Ω
J3, J4, & J5
5.9K Ω
J2
18.9K Ω
J2
7.5K Ω
J3, J4, & J5
9.9K Ω
J3, J4, & J5
5.2K Ω
J2
9.9K Ω
J2
7.5K Ω
J3, J4, & J5
9.9K Ω
J3, J4, & J5
5K Ω
J2
9.9K Ω
J2
15K Ω
J5
18.9K Ω
J5
- - -
- - -
7.5K Ω
J5
9.9K Ω
J5
7.5K Ω
J5
9.9K Ω
J5
44
Cooling Troubleshooting
Use the Scrolling Marquee display or a CCN device to view the cooling status display and the cooling diagnostic display (see Appendix A) for information on the cooling operation. Check the
If alarms conditions are corrected and cleared, operation of the compressors and fans may be verified by using the Service Test mode. (See Table 4.) See Table 14 for general cooling service analysis.
current alarms and alarm history for any cooling alarm codes and correct any causes. (See Table 12.) Verify any unique control configurations per installed site requirements or accessories.
Table 14 – Cooling Service Analysis
PROBLEM CAUSE REMEDY
Compressor and Fan Will Not Start.
Compressor Cycles (other than normally satisfying thermostat).
Compressor Operates Continuously.
Excessive Condenser Pressures.
Condenser Fans Not Operating. No Power to contactors. Fuse blown or plug at motor loose. Excessive Suction Pressure.
Suction Pressure Too Low.
LEGEND CB - Circuit Breaker TXV - Thermostatic Expansion Valve
Power failure. Call power company. Fuse blown or circuit breaker tripped. Check CB1,
CB2, and CB3. Disconnect off. Power disconnect. Compressor time guard to prevent short cycling. Check using ComfortLink Scrolling Marquee. Thermostat or occupancy schedule set point not
calling for Cooling. Outdoor temperature too low. Check Compressor Lockout Temperature using
Active alarm. Check active alarms using ComfortLink Scrolling
Insufficient line voltage. Determine cause and correct. Active alarm. Check active alarms using ComfortLink Scrolling
Unit undersized for load. Decrease load or increase size of unit. Thermostat or occupancy schedule set point too low. Reset thermostat or schedule set point. Dirty air filters. Replace filters. Low refrigerant charge. Check pressure, locate leak, repair, evacuate, and
Condenser coil dirty or restricted. Clean coil or remove restriction. Loose condenser thermistors. Tighten thermistors. Dirty condenser coil. Clean coil. Refrigerant overcharge. Recover excess refrigerant. Faulty TXV. 1. Check TXV bulb mounting and secure tightly to
Condenser air restricted or air short cycling. Determine cause and correct. Restriction in liquid tube. Remove restriction.
High heat load. Check for sources and eliminate Faulty TXV. 1. Check TXV bulb mounting and secure tightly to
Refrigerant overcharged. Recover excess refrigerant. Dirty air filters. Replace air filters. Low refrigerant charge. Check pressure, locate leak, repair, evacuate, and
Faulty TXV. 1. Check TXV bulb mounting and secure tightly to
Insufficient evaporator airflow. Check belt tension. Check for other restrictions. Temperature too low in conditioned area (low
return‐air temperature).
Replace fuse or reset circuit breaker.
Check using ComfortLink Scrolling Marquee.
ComfortLink Scrolling Marquee.
Marquee.
Marquee.
recharge.
suction line and insulate.
2. Replace TXV (and filter drier) if stuck open or closed.
suction line and insulate.
2. Replace TXV (and filter drier) if stuck open or closed.
recharge.
suction line and insulate.
2. Replace TXV (and filter drier) if stuck open or closed.
Reset thermostat or occupancy schedule.
48/50PG and PM
45
Humidi−MiZert Troubleshooting
Use the unit Scrolling Marquee display or a CCN device to view the cooling status display and the cooling diagnostic display (see Appendix A) for information on the cooling operation and the related Humidi-MiZer operation. Check the current alarms and alarm history for any cooling alarm codes and correct any causes. (See Table 12.) Verify any unique control configurations per installed site requirements or accessories.
Subcooling Reheat Mode Will Not Activate.
Hot Gas Reheat Mode Will Not Activate.
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No Dehumidification Demand.
CRC Relay Operation.
CV or RH1 Valve Operation. (NOTE: Normally Open When De‐energized)
RH2 Valve Operation. (NOTE: Normally Closed When De‐energized)
Low Latent Capacity in Subcooling or Hot Gas Reheat Modes.
Low Sensible Capacity in Normal Cool or Subcooling Reheat Modes.
Low Suction Pressure and High Superheat During Normal Cool Mode.
Low Suction Pressure and High Discharge Pressure.
RH2 Valve Cycling On/Off.
Circuit B or C Will Not Operate With Circuit A Off.
LEGEND CRC - Cooling/Reheat Control CV - Cooling Valve RH - Relative Humidity
If alarm conditions are corrected and cleared, operation of the compressors, fans, and Humidi-MiZer valves may be verified by using the Service Test mode. (See Table 4.) In addition to general cooling service analysis (See Table 14), see Table 15 for general Humidi-MiZer service analysis.
NOTE: Wiring, operation, and charge are different on a Humidi-MiZer unit compared to a standard unit.
Table 15 – Humidi-MiZer Service Analysis
PROBLEM CAUSE REMEDY
General cooling mode problem. See Cooling Service Analysis (Table 14). No dehumidification demand. See No Dehumidification Demand, below. CRC relay operation. See CRC Relay Operation, below. Circuit RH1 valve is not open. See RH1 Valve Operation, below. Circuit CV valve is not closed. See CV Valve Operation, below. General cooling mode problem. See Cooling Service Analysis (Table 14). No dehumidification demand. See No Dehumidification Demand, below. CRC relay operation. See CRC Relay Operation, below. Circuit RH1 valve is not open. See RH1 Valve Operation, below. Circuit CV valve is not closed. See CV Valve Operation, below. Circuit RH2 valve is not open. See RH2 Valve Operation, below.
Outdoor temperature too low.
Relative humidity setpoint is too low — Humidistat
Relative humidity setpoint is too low — RH sensor.
Software configuration error for accessory humidistat.
Software configuration error for accessory humidity sensor.
No humidity signal. Check wiring. Check humidistat or humidity sensor.
No 24V signal to input terminals.
No power to output terminals. Check wiring. Relay outputs do not change state. Replace faulty relay.
No 24V signal to input terminals.
Solenoid coil burnout.
Stuck valve. Replace valve. Replace filter drier.
No 24V signal to input terminals.
Solenoid coil burnout.
Stuck valve. Replace valve. Replace filter drier.
CV valve open or leaking. See CV Valve Operation, above.
RH2 valve open or leaking. See RH2 Valve Operation, above.
General cooling mode problem. See Cooling Service Analysis (Table 14). RH2 valve open or leaking. See RH2 Valve Operation, above. General cooling mode problem. See Cooling Service Analysis (Table 14). Both RH1 and CV valves closed. See RH1 and CV Valve Operation, above.
Hot Gas Reheat mode low suction pressure limit.
Normal operation. Motormaster outdoor fan con trol requires operation of circuit A.
Check Reheat2 Circuit Limit Temperatures (Configuration→HMZR→RA.LO and RB.LO) using ComfortLink Scrolling Marquee.
Check/reduce setting on accessory humidistat.
Check Space RH Setpoints (Setpoints→RH.SP and RH.UN) and occupancy using ComfortLink Scrolling Marquee.
Check Space Humidity Switch (Configuration→ UNIT→RH.SW) using ComfortLink Scrolling Marquee.
Check RH Sensor on OAQ Input (Configuration→ UNIT→RH.S) using ComfortLink Scrolling Marquee.
Check using Cool→Reheat1 Valve Test (Service Test→HMZR→CRC) using ComfortLink Scrolling Marquee.
Check MBB relay output. Check wiring. Check transformer and circuit breaker.
Check using Cool→Reheat1 Valve Test (Service Test→HMZR→CRC) using ComfortLink Scrolling Marquee.
Check CRC Relay Operation. Check Wiring. Check transformer and circuit beaker or fuses. Check continuous over‐voltage is less than 10%. Check under‐voltage is less than 15%. Check for missing coil assembly parts. Check for damaged valve enclosing tube.
Check using Cool→Reheat1 Valve Test (Service Test→HMZR→RHV.A or RHV.B) using ComfortLink Scrolling Marquee.
Check MBB relay output. Check wiring. Check transformer and circuit breaker or fuses. Check continuous over‐voltage is less than 10%. Check under‐voltage is less than 15%. Check for missing coil assembly parts. Check for damaged valve enclosing tube.
Normal Operation During Mixed Circuit Subcooling and Hot Gas Reheat Modes at Lower Outdoor Temperatures.
None
46
Economizer Troubleshooting
Use the unit Scrolling Marquee display or a CCN device to view the economizer status display and the economizer diagnostic display (see Appendix A) for information on the economizer operation. Check the current alarms and alarm history for any economizer alarm codes and correct any causes. (See Table 12.) Verify any unique control configurations per installed site requirements or accessories. If alarms conditions are corrected and cleared, operation of the economizer may be verified by using the Service Test mode (see Service Test section and Table 4). The following steps specify how to test the economizer using the Scrolling Marquee display. See Table 16 for general economizer service analysis.
1. Enter the Service Test main menu on the display.
2. Enter TEST and turn ON test mode. A password may be
needed in order to turn ON the Service Test. The default password is 1111.
3. Return to the main level of Service Test.
4. Enter the INDP submenu and enter an initial value for ECON. This will drive the economizer damper to the specified position. Continue to adjust the ECON value to make sure the economizer opens and closes.
Table 16 – Economizer Service Analysis
PROBLEM POSSIBLE CAUSE REMEDY
Damper Does Not Move. Indoor Fan is off.
Actuator is unplugged at motor or at economizer board.
Unit is not configured for economizer. Configure unit for economizer per the
Outdoor‐air temperature is above economizer high temperature lockout.
Outdoor‐air temperature is below economizer low temperature lockout.
Communication loss to economizer board. Check wiring connections. Damper is jammed. Identify the obstruction and safely remove.
Economizer Operation is Limited to Minimum Position.
Economizer Position is Less Than Minimum Position.
Economizer Does Not Return to Minimum Position.
Damper Does Not Close on Power Loss.
Outdoor Damper Does Not Fully Close at 0% or Fully Open at 100%.
Economizer is Not at Configured Minimum Position
LEGEND CCN - Carrier Comfort Network IAQ - Indoor Air Quality
Minimum position is set incorrectly. Adjust minimum position setting. Outdoor‐air temperature is above economizer
high temperature lockout.
Outdoor‐air temperature is below economizer low temperature lockout.
Enthalpy or differential dry bulb are preventing free cooling.
Outdoor‐air thermistor is faulty. Replace outdoor‐air thermistor. Low suction pressure problem with a compressor. Economizer is operating correctly, identify
IAQ is controlling minimum damper position. Adjust the IAQ settings if incorrect,
Unit is in Unoccupied mode. Adjust unit occupied schedule if incorrect,
Unit is operating under free cooling. Economizer is operating correctly.
Damper is jammed or spring return is backwards. Identify the obstruction and safely remove.
Economizer actuator is out of calibration or spring return is backwards.
Unit is operating under free cooling or a force is applied to the commanded position.
5. Because of a mechanical problem with the economizer, the actuator might acquire a new degree of rotation which is less than M.ANG. If this occurs, a “T414 Economizer Damper Actuator Out of Calibration” alert will be generated. This alert can only occur if the economizer is using digital communications (Configuration →ECON→E.CTL = 1 or 2). The economizer calibration procedure (Service Test→IND.P→E.CAL) will reconfigure the actuator to the new fully closed and fully open positions. To implement the calibration procedure, change E.CAL from OFF to ON. E.CAL will remain ON as long as the calibration procedure is being implemented (as long as 5 minutes). During the calibration procedure the actuator will close fully and then open fully. After the calibration is complete, the degree of rotation should be greater than M.ANG, causing the T414 alert to clear. If the T414 alert does not clear, check the economizer damper for other mechanical problems.
6. Return to Service Test→TEST and turn OFF test mode. This will cause the unit to return to normal operation.
Check for proper thermostat connection. Unit is not configured for continuous fan
operation and the thermostat is not calling for heating or cooling.
Unit is in Unoccupied mode and there is no call for heating or cooling.
Tripped circuit breaker. No power to the unit. Unit is off via CCN command. Check wiring connections.
instructions. Adjust the high temperature lockout setting
if it is incorrect, otherwise, economizer is operating correctly.
Adjust the low temperature lockout setting if it is incorrect, otherwise, economizer is operating correctly.
Adjust the high temperature lockout setting if it is incorrect, otherwise, economizer is operating correctly.
Adjust the low temperature lockout setting if it is incorrect, otherwise, economizer is operating correctly.
Check enthalpy and return air compared to outside air temperature.
compressor problem.
otherwise, the economizer is operating correctly.
otherwise, economizer is operating correctly.
Enter Service Test mode and run the Calibrate Economizer (E.CAL) procedure.
Economizer is operating correctly.
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Heating Troubleshooting
Use the unit Scrolling Marquee display or a CCN device to view the heating status display and the heating diagnostic display (see Appendix A) for information on the heating operation. Check the current alarms and alarm history for any heating alarm codes and correct any causes. (See Table 12.) Verify any unique control configurations per installed site requirements or accessories. If alarms conditions are corrected and cleared, operation of the heat stages and indoor fan may be verified by using the Service Test mode. (See Table 4.)
PROBLEM CAUSE REMEDY
Heat Will Not Turn On.
Burners Will Not Ignite.
48/50PG and PM
Inadequate Heating.
Poor Flame Characteristics.
Burners Will Not Turn Off.
Gas Heat (48PG Units)
See Table 17 for general gas heating service analysis. See Fig. 21 for service analysis of the IGC board logic. Check the status LED on the IGC board for any flashing alarm codes and correct any causes. (See Table 18.)
Electric Heat (50PG Units)
See Table 19 for electric heating service analysis.
Table 17 – Gas Heating Service Analysis
Unit is NOT configured for heat. Check heating configurations using the ComfortLink Scrolling
Active alarm. Check active alarms using ComfortLink Scrolling Marquee
No power to unit. Check power supply, fuses, wiring, and circuit breakers. No power to IGC (Integrated Gas Control). Check fuses and plugs. Heaters off due to time guard to prevent short
cycling. Thermostat or occupancy schedule set point not
calling for Cooling. No gas at main burners. Check gas line for air and purge as necessary. After purging gas
Water in gas line. Drain water and install drip. Dirty air filters. Replace air filters. Gas input too low. Check gas pressure at manifold. Refer to gas valve adjustment. Thermostat or occupancy schedule set point only
calling for W1. Unit undersized for load. Decrease load or increase of size of unit. Restricted airflow. Remove restriction. Check SAT compared to the SAT heating
Too much outdoor air. Check economizer position and configuration. Adjust minimum
Limit switch cycles main burners. Check rotation of blower, thermostat heat anticipator settings,
Incomplete combustion (lack of combustion air) results in: Aldehyde odors, CO, sooting flame, or floating flame.
Unit is in Minimum on‐time. Check using ComfortLink Scrolling Marquee and the IGC flash
Unit running in Service Test mode. Check using ComfortLink Scrolling Marquee. Main gas valve stuck. Turn off gas supply and unit power. Replace gas valve.
Marquee
and the IGC flash codes.
Check using ComfortLink Scrolling Marquee and the IGC flash codes.
Check using ComfortLink Scrolling Marquee.
line of air, allow gas to dissipate for at least 5 minutes before attempting to re‐light unit.
Allow time for W2 to energize or adjust setpoints.
limits.
position using ComfortLink Scrolling Marquee.
and temperature rise of unit. Adjust as needed. Check all screws around flue outlets and burner compartment.
Tighten as necessary. Cracked heat exchanger, replace. Unit is over‐fired, reduce input. Adjust gas line or manifold
pressure. Check vent for restriction. Clean as necessary. Check orifice to burner alignment.
codes.
48
48/50PG and PM
LEGEND
IDM -- Induced-Draft Motor IGC -- Integrated Gas Unit Controller
NOTE: Thermostat Fan Switch in the “AUTO” position.
C07014
Fig. 21 − IGC Service Analysis Logic
49
LED
FLASH
CODE
On Normal Operation Off Hardware Failure No gas heating.
1 Flash Indoor Fan On/Off Delay
2 Flashes Limit Switch Fault Gas valve and igniter Off.
3 Flashes Flame Sense Fault Indoor fan and inducer On. Flame sense normal.
4 Flashes Four Consecutive Limit
5 Flashes Ignition Fault No gas heating. Heat call (W) Off.
48/50PG and PM
6 Flashes Induced Draft Motor
7 Flashes Rollout Switch Lockout Gas valve and igniter Off.
8 Flashes Internal Control Lockout No gas heating. Power reset. IGC has sensed internal hardware or software error. If
9 Flashes Temporary Software
LEGEND IGC - Integrated Gas Unit Control LED - Light-Emitting Diode
DESCRIPTION
Modified
Switch Fault
Fault
Lockout
Table 18 – IGC Board LED Alarm Codes
ACTION TAKEN BY
CONTROL
— — —
5 seconds subtracted from On delay. 5 seconds added to Off delay (3 min max).
Indoor fan and inducer On.
No gas heating. Heat call (W) Off.
If heat off: no gas heating. If heat on: gas valve Off and inducer On.
Indoor fan and inducer On.
No gas heating. 1 hour auto reset, or
RESET METHOD PROBABLE CAUSE
—
Power reset. High temperature limit switch opens during heat
Limit switch closed, or heat call (W) Off.
Power reset for LED reset.
Power reset for LED reset.
Power reset for LED reset.
Inducer sense normal, or heat call (W) Off.
Power reset. Rollout switch has opened. Check gas valve
power reset.
NOTES:
1. There is a 3-second pause between alarm code displays.
2. If more than one alarm code exists, all applicable alarm codes will be displayed in numerical sequence.
3. Alarm codes on the IGC will be lost if power to the unit is interrupted.
Loss of power to the IGC. Check 5 amp fuse on IGC, power to unit, 24V circuit breaker, transformer, and wiring to the IGC.
exchanger warm‐up period before fan‐on delay expires. High temperature limit switch opens within 10 minutes of heat call (W) Off. See Limit Switch Fault.
High temperature limit switch is open. Check the operation of the indoor (evaporator) fan motor. Ensure that the supply‐air temperature rise is within the range on the unit nameplate. Check wiring and limit switch operation.
The IGC sensed a flame when the gas valve should be closed. Check wiring, flame sensor, and gas valve operation.
4 consecutive limit switch faults within a single call for heat. See Limit Switch Fault.
Unit unsuccessfully attempted ignition for 15 minutes. Check igniter and flame sensor electrode spacing, gaps, etc. Check flame sense and igniter wiring. Check gas valve operation and gas supply.
Inducer sense On when heat call Off, or inducer sense Off when heat call On. Check wiring, voltage, and operation of IGC motor. Check speed sensor wiring to IGC.
operation. Check induced‐draft blower wheel is properly secured to motor shaft.
fault is not cleared by resetting 24 v power, replace the IGC.
Electrical interference is disrupting the IGC software.
PROBLEM CAUSE REMEDY
Heat Will Not Turn On.
Inadequate Heating.
Heat Will Not Turn Off.
Table 19 – Electric Heat Service Analysis
Active alarm. Check active alarms using ComfortLink Scrolling
Unit is NOT configured for heat. Check heating configurations using the ComfortLink
No power to unit. Check power supply, fuses, wiring, and circuit breakers. Unit is in minimum heat off‐time, or minimum cool‐heat
changeover time. Thermostat or occupancy schedule setpoint not
calling for heating. Heat forced off in Service Test mode. Check using ComfortLink Scrolling Marquee. Turn Service
No 24 vac at heater contactor.
Open temperature limit switch on heater. Check minimum airflow. Check limit switch when it is cool,
Dirty air filters. Replace air filters. Thermostat or occupancy schedule setpoint only
calling for W1. Heat undersized for load. Decrease load or increase size of heater. Restricted airflow Remove restriction. Check SAT compared to the SAT
Too much outdoor air. Check economizer position and configuration. Adjust
Limit switch cycles heaters. Check rotation of blower and minimum airflow. Bad heater elements. Power off unit and remove high voltage wires. Check
Unit is in minimum heat on‐time. Check using ComfortLink Scrolling Marquee. Thermostat or occupancy schedule setpoint still
calling for heating. Heat forced on in Service Test mode. Check using ComfortLink Scrolling Marquee. Turn Service
Heater contactor failed. Power off unit. Check contactor and replace if closed.
Marquee.
Scrolling Marquee
Check using ComfortLink Scrolling Marquee.
Check using ComfortLink Scrolling Marquee.
Test mode off. Check transformer and circuit breaker. Check auto‐reset limit switches on heater. Check manual‐reset limit switch (LS) on indoor fan housing.
replace if open.
Allow time for W2 to energize or adjust setpoints.
heating limits.
minimum position.
resistance of element, replace if open.
Check using ComfortLink Scrolling Marquee.
Test mode off.
50
Phase Loss Protection
The phase loss protection option will monitor the three-phase electrical system to provide phase reversal and phase loss protection.
Phase Reversal Protection
If the control senses an incorrect phase relationship, the relay (K1) will be de-energized (opening its contact). If the phase relationship is correct, the relay will be energized. The control has a self-bypass function after a pre-set time. If the control determines that the three phases stay in a correct relationship for 10 consecutive minutes, the relay will stay energized regardless of the phase sequence of three inputs as long as 24-vac control voltage is applied. This self-bypass function will be reset if all three phases are restored in a phase loss event.
Phase Loss Protection
If the reverse rotation board senses any one of the three phase inputs has no AC voltage, the relay will be de−energized (opening its contact). This protection is always active as long as 24-vac control voltage is applied, and is not affected by the self by-pass function of the phase sequence monitoring function. However, in the event of phase loss, the relay will be re-energized only if all three phases are restored and the three phases are in the correct sequence.
A red LED is provided to indicate the function of the board. See the table below.
LED STATUS FUNCTION
On Continuously Relay contact closed (normal operation).
Blinking
Off 24 vac control power not present (off).
Relay contact open (phase loss or phase reversal has occurred) — No power will be supplied to the control system.
Thermistor Troubleshooting
The electronic control uses thermistors to sense temperatures used to control operation of the unit. Resistances at various temperatures are listed in Table 20 and 21. Thermistor pin connection points are shown in the Major System Components section. The general locations of the thermistors are shown the Major System Components section.
Air Temperatures
Air temperatures are measured with 10 kilo-ohm thermistors. This includes supply-air temperature (SAT), outdoor-air temperature (OAT), space temperature sensors (T55, T56, T58), and return air temperature (RAT).
The supply air temperature (SAT) and outdoor air temperature (OAT) thermistors use a snap-mount to attach through the unit sheet metal panels. The snap-mount tabs must be flattened on the tip end of the sensor to release for removal from the panel. (See Fig. 22.) To reinstall, make sure the snap-mount tabs extend out.
Refrigerant Temperatures
Condenser coil temperatures are measured with 5 kilo-ohm thermistors. These measurements provide an approximate saturated condensing temperature for each circuit (SCT.A, SCT.B, SCT.C). Fig. 23−24 show the factory locations for the SCT thermistors on 48/50PG03−16 units. On 48/50PG20−28 and 48/50PM16−28 units the location is on the component arrangement diagrams. Ensure that thermistors are placed at the correct location and are snapped securely over the return bend so that contact is made between the thermistor and the tube.
48/50PG and PM
C07015
Fig. 22 − SAT and OAT Thermistor Mounting
Thermistor/Temperature Sensor Check
A high quality digital volt-ohmmeter is required to perform this check.
Connect the digital voltmeter across the appropriate thermistor terminals at the J8 terminal strip on the Main Base Board (see Major System Components section).
Using the voltage reading obtained, read the sensor temperature from Table 20 and 21.
To check thermistor accuracy, measure temperature at probe location with an accurate thermocouple-type temperature-measuring instrument. Insulate thermocouple to avoid ambient temperatures from influencing reading. Temperature measured by thermocouple and temperature determined from thermistor voltage reading should be close, within 5°F if care was taken in applying thermocouple and taking readings.
If a more accurate check is required, unit must be shut down and thermistor removed and checked at a known temperature (freezing point or boiling point of water) using either voltage drop measured across thermistor at the J8 terminal, or by determining the resistance with unit shut down and thermistor disconnected from J8. Compare the values determined with the value read by the control in the Temperatures mode using the Scrolling Marquee display.
51
SCT.A
MOTORMASTER SENSOR
(3rd return bend down from top)
MOTORMASTER SENSOR
(bottom stub of outside header)
SCT.A
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THERMISTOR LOCATION (SCT.B)
Sensor Trim
Transducer Troubleshooting
The electronic control uses suction pressure transducers to measure the suction pressure of the refrigerant circuits. The pressure/voltage characteristics of these transducers are in shown in Table 22, the 5vdc power is applied to legs A and B of the transducer and legs B to C represent the signal voltage. To use the voltage drop table for troubleshooting, read the voltage across A and B, then subtract the voltage reading from B to C. This is the voltage drop which can be
48/50PG03,04
48/50PG03-07
Fig. 23 − Saturated Condensing Temperature Thermistor Location — 48/50PG03−07
THERMISTOR LOCATION (SCT.B)
THERMISTOR LOCATION (SCT.A)
MOTORMASTER SENSOR (2nd stub from bottom of outside header)
48/50PG08-12
48/50PG14
Fig. 24 − Saturated Condensing Temperature Thermistor Location — 48/50PG08−14
looked up in table 22. The accuracy of these transducers can be verified by connecting an accurate pressure gauge to the second refrigerant port in the suction line.
Forcing Inputs and Outputs
If the user needs to force a variable, follow the same process as when editing a configuration parameter. A forced variable will be displayed on the Scrolling Marquee with a blinking period “.” following its value. A forced value on Navigator accessory is indicated with a blinking “f”. A forced value on CCN devices is indicated with “Control” if forced at the unit display, or “Supervisor” if forced via CCN. To remove a local force with the Scrolling Marquee, select the point with the ENTER key and then press the up-arrow and down-arrow keys simultaneously.
NOTE: In the case of a control power reset, any force in effect at the time of power reset will be cleared.
THERMISTOR LOCATION (SCT.A)
MOTORMASTER SENSOR (4th stub from bottom of outside header)
C09347
C09348
52
Table 20 – Temperature (_F) vs Resistance/Voltage Drop Values for
OAT, SAT, and SPT Thermistors (10K at 25_C Type II Resistors)
TEMP
(F) –25 4.758 196,453 61 2.994 14,925 147 0.890 2,166 –24 4.750 189,692 62 2.963 14,549 148 0.876 2,124 –23 4.741 183,300 63 2.932 14,180 149 0.862 2,083 –22 4.733 177,000 64 2.901 13,824 150 0.848 2,043 –21 4.724 171,079 65 2.870 13,478 151 0.835 2,003 –20 4.715 165,238 66 2.839 13,139 152 0.821 1,966 –19 4.705 159,717 67 2.808 12,814 153 0.808 1,928 –18 4.696 154,344 68 2.777 12,493 154 0.795 1,891 –17 4.686 149,194 69 2.746 12,187 155 0.782 1,855 –16 4.676 144,250 70 2.715 11,884 156 0.770 1,820 –15 4.665 139,443 71 2.684 11,593 157 0.758 1,786 –14 4.655 134,891 72 2.653 11,308 158 0.745 1,752 –13 4.644 130,402 73 2.622 11,031 159 0.733 1,719 –12 4.633 126,183 74 2.592 10,764 160 0.722 1,687 –11 4.621 122,018 75 2.561 10,501 161 0.710 1,656 –10 4.609 118,076 76 2.530 10,249 162 0.699 1,625
–9 4.597 114,236 77 2.500 10,000 163 0.687 1,594 –8 4.585 110,549 78 2.470 9,762 164 0.676 1,565 –7 4.572 107,006 79 2.439 9,526 165 0.666 1,536 –6 4.560 103,558 80 2.409 9,300 166 0.655 1,508 –5 4.546 100,287 81 2.379 9,078 167 0.645 1,480 –4 4.533 97,060 82 2.349 8,862 168 0.634 1,453 –3 4.519 94,020 83 2.319 8,653 169 0.624 1,426 –2 4.505 91,019 84 2.290 8,448 170 0.614 1,400 –1 4.490 88,171 85 2.260 8,251 171 0.604 1,375
0 4.476 85,396 86 2.231 8,056 172 0.595 1,350 1 4.461 82,729 87 2.202 7,869 173 0.585 1,326 2 4.445 80,162 88 2.173 7,685 174 0.576 1,302 3 4.429 77,662 89 2.144 7,507 175 0.567 1,278 4 4.413 75,286 90 2.115 7,333 176 0.558 1,255 5 4.397 72,940 91 2.087 7,165 177 0.549 1,233 6 4.380 70,727 92 2.059 6,999 178 0.540 1,211 7 4.363 68,542 93 2.030 6,838 179 0.532 1,190 8 4.346 66,465 94 2.003 6,683 180 0.523 1,169
9 4.328 64,439 95 1.975 6,530 181 0.515 1,148 10 4.310 62,491 96 1.948 6,383 182 0.507 1,128 11 4.292 60,612 97 1.921 6,238 183 0.499 1,108 12 4.273 58,781 98 1.894 6,098 184 0.491 1,089 13 4.254 57,039 99 1.867 5,961 185 0.483 1,070 14 4.235 55,319 100 1.841 5,827 186 0.476 1,052 15 4.215 53,693 101 1.815 5,698 187 0.468 1,033 16 4.195 52,086 102 1.789 5,571 188 0.461 1,016 17 4.174 50,557 103 1.763 5,449 189 0.454 998 18 4.153 49,065 104 1.738 5,327 190 0.447 981 19 4.132 47,627 105 1.713 5,210 191 0.440 964 20 4.111 46,240 106 1.688 5,095 192 0.433 947 21 4.089 44,888 107 1.663 4,984 193 0.426 931 22 4.067 43,598 108 1.639 4,876 194 0.419 915 23 4.044 42,324 109 1.615 4,769 195 0.413 900 24 4.021 41,118 110 1.591 4,666 196 0.407 885 25 3.998 39,926 111 1.567 4,564 197 0.400 870 26 3.975 38,790 112 1.544 4,467 198 0.394 855 27 3.951 37,681 113 1.521 4,370 199 0.388 841 28 3.927 36,610 114 1.498 4,277 200 0.382 827 29 3.903 35,577 115 1.475 4.185 201 0.376 814 30 3.878 34,569 116 1.453 4,096 202 0.370 800 31 3.853 33,606 117 1.431 4,008 203 0.365 787 32 3.828 32,654 118 1.409 3,923 204 0.359 774 33 3.802 31,752 119 1.387 3,840 205 0.354 762 34 3.776 30,860 120 1.366 3,759 206 0.349 749 35 3.750 30,009 121 1.345 3,681 207 0.343 737 36 3.723 29,177 122 1.324 3,603 208 0.338 725 37 3.697 28,373 123 1.304 3,529 209 0.333 714 38 3.670 27,597 124 1.284 3,455 210 0.328 702 39 3.654 26,838 125 1.264 3,383 211 0.323 691 40 3.615 26,113 126 1.244 3,313 212 0.318 680 41 3.587 25,396 127 1.225 3,244 213 0.314 670 42 3.559 24,715 128 1.206 3,178 214 0.309 659 43 3.531 24,042 129 1.187 3,112 215 0.305 649 44 3.503 23,399 130 1.168 3,049 216 0.300 639 45 3.474 22,770 131 1.150 2,986 217 0.296 629 46 3.445 22,161 132 1.132 2,926 218 0.292 620 47 3.416 21,573 133 1.114 2,866 219 0.288 610 48 3.387 20,998 134 1.096 2,809 220 0.284 601 49 3.357 20,447 135 1.079 2,752 221 0.279 592 50 3.328 19,903 136 1.062 2,697 222 0.275 583 51 3.298 19,386 137 1.045 2,643 223 0.272 574 52 3.268 18,874 138 1.028 2,590 224 0.268 566 53 3.238 18,384 139 1.012 2,539 225 0.264 557 54 3.208 17,904 140 0.996 2,488 55 3.178 17,441 141 0.980 2,439 56 3.147 16,991 142 0.965 2,391 57 3.117 16,552 143 0.949 2,343 58 3.086 16,131 144 0.934 2,297 59 3.056 15,714 145 0.919 2,253 60 3.025 15,317 146 0.905 2,209
VOLTAGE DROP (V)
RESISTANCE
(Ohms)
TEMP
(F)
VOLTAGE DROP (V)
RESISTANCE
(Ohms)
TEMP
(F)
VOLTAGE DROP (V)
RESISTANCE
(Ohms)
48/50PG and PM
53
TEMP
(F) –25 3.699 98,010 59 1.982 7,866 143 0.511 1,190 –24 3.689 94,707 60 1.956 7,665 144 0.502 1,165 –23 3.679 91,522 61 1.930 7,468 145 0.494 1,141 –22 3.668 88,449 62 1.905 7,277 146 0.485 1,118 –21 3.658 85,486 63 1.879 7,091 147 0.477 1,095 –20 3.647 82,627 64 1.854 6,911 148 0.469 1,072 –19 3.636 79,871 65 1.829 6,735 149 0.461 1,050 –18 3.624 77,212 66 1.804 6,564 150 0.453 1,029 –17 3.613 74,648 67 1.779 6,399 151 0.445 1,007 –16 3.601 72,175 68 1.754 6,238 152 0.438 986 –15 3.588 69,790 69 1.729 6,081 153 0.430 965 –14 3.576 67,490 70 1.705 5,929 154 0.423 945 –13 3.563 65,272 71 1.681 5,781 155 0.416 925 –12 3.550 63,133 72 1.656 5,637 156 0.408 906 –11 3.536 61,070 73 1.632 5,497 157 0.402 887 –10 3.523 59,081 74 1.609 5,361 158 0.395 868
–9 3.509 57,162 75 1.585 5,229 159 0.388 850 –8 3.494 55,311 76 1.562 5,101 160 0.381 832 –7 3.480 53,526 77 1.538 4,976 161 0.375 815 –6 3.465 51,804 78 1.516 4,855 162 0.369 798 –5 3.450 50,143 79 1.493 4,737 163 0.362 782 –4 3.434 48,541 80 1.470 4,622 164 0.356 765 –3 3.418 46,996 81 1.448 4,511 165 0.350 750 –2 3.402 45,505 82 1.426 4,403 166 0.344 734 –1 3.386 44,066 83 1.404 4,298 167 0.339 719
0 3.369 42,679 84 1.382 4,196 168 0.333 705
48/50PG and PM
1 3.352 41,339 85 1.361 4,096 169 0.327 690 2 3.335 40,047 86 1.340 4,000 170 0.322 677 3 3.317 38,800 87 1.319 3,906 171 0.317 663 4 3.299 37,596 88 1.298 3,814 172 0.311 650 5 3.281 36,435 89 1.278 3,726 173 0.306 638 6 3.262 35,313 90 1.257 3,640 174 0.301 626 7 3.243 34,231 91 1.237 3,556 175 0.296 614 8 3.224 33,185 92 1.217 3,474 176 0.291 602
9 3.205 32,176 93 1.198 3,395 177 0.286 591 10 3.185 31,202 94 1.179 3,318 178 0.282 581 11 3.165 30,260 95 1.160 3,243 179 0.277 570 12 3.145 29,351 96 1.141 3,170 180 0.272 561 13 3.124 28,473 97 1.122 3,099 181 0.268 551 14 3.103 27,624 98 1.104 3,031 182 0.264 542 15 3.082 26,804 99 1.086 2,964 183 0.259 533 16 3.060 26,011 100 1.068 2,898 184 0.255 524 17 3.038 25,245 101 1.051 2,835 185 0.251 516 18 3.016 24,505 102 1.033 2,773 186 0.247 508 19 2.994 23,789 103 1.016 2,713 187 0.243 501 20 2.972 23,096 104 0.999 2,655 188 0.239 494 21 2.949 22,427 105 0.983 2,597 189 0.235 487 22 2.926 21,779 106 0.966 2,542 190 0.231 480 23 2.903 21,153 107 0.950 2,488 191 0.228 473 24 2.879 20,547 108 0.934 2,436 192 0.224 467 25 2.856 19,960 109 0.918 2,385 193 0.220 461 26 2.832 19,393 110 0.903 2,335 194 0.217 456 27 2.808 18,843 111 0.888 2,286 195 0.213 450 28 2.784 18,311 112 0.873 2,239 196 0.210 445 29 2.759 17,796 113 0.858 2,192 197 0.206 439 30 2.735 17,297 114 0.843 2,147 198 0.203 434 31 2.710 16,814 115 0.829 2,103 199 0.200 429 32 2.685 16,346 116 0.815 2,060 200 0.197 424 33 2.660 15,892 117 0.801 2,018 201 0.194 419 34 2.634 15,453 118 0.787 1,977 202 0.191 415 35 2.609 15,027 119 0.774 1,937 203 0.188 410 36 2.583 14,614 120 0.761 1,898 204 0.185 405 37 2.558 14,214 121 0.748 1,860 205 0.182 401 38 2.532 13,826 122 0.735 1,822 206 0.179 396 39 2.506 13,449 123 0.723 1,786 207 0.176 391 40 2.480 13,084 124 0.710 1,750 208 0.173 386 41 2.454 12,730 125 0.698 1,715 209 0.171 382 42 2.428 12,387 126 0.686 1,680 210 0.168 377 43 2.402 12,053 127 0.674 1,647 211 0.165 372 44 2.376 11,730 128 0.663 1,614 212 0.163 367 45 2.349 11,416 129 0.651 1,582 213 0.160 361 46 2.323 11,112 130 0.640 1,550 214 0.158 356 47 2.296 10,816 131 0.629 1,519 215 0.155 350 48 2.270 10,529 132 0.618 1,489 216 0.153 344 49 2.244 10,250 133 0.608 1,459 217 0.151 338 50 2.217 9,979 134 0.597 1,430 218 0.148 332 51 2.191 9,717 135 0.587 1,401 219 0.146 325 52 2.165 9,461 136 0.577 1,373 220 0.144 318 53 2.138 9,213 137 0.567 1,345 221 0.142 311 54 2.112 8,973 138 0.557 1,318 222 0.140 304 55 2.086 8,739 139 0.548 1,291 223 0.138 297 56 2.060 8,511 140 0.538 1,265 224 0.135 289 57 2.034 8,291 141 0.529 1,240 225 0.133 282 58 2.008 8,076 142 0.520 1,214
Table 21 – Temperature (_F) vs. Resistance/Voltage Drop Values for SCT Sensors (5K at 25_C Resistors)
VOLTAGE DROP (V)
RESISTANCE
(Ohms)
TEMP (F)
VOLTAGE DROP (V)
RESISTANCE
(Ohms)
TEMP (F)
VOLTAGE DROP (V)
RESISTANCE
(Ohms)
54
PRESSURE
(psig)
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66
Table 22 – Pressure (psig) vs. Voltage Drop Values for Suction Pressure Transducers
VOLTAGE DROP (V)
0.465
0.485
0.505
0.524
0.544
0.564
0.583
0.603
0.623
0.642
0.662
0.682
0.702
0.721
0.741
0.761
0.780
0.800
0.820
0.839
0.859
0.879
0.898
0.918
0.938
0.958
0.977
0.997
1.017
1.036
1.056
1.076
1.095
1.115
PRESSURE
(psig)
68 70 72 74 76 78 80 82 84 86 88 90 92 94 96 98 100 102 104 106 108 110 112 114 116 118 120 122 124 126 128 130 132 134
VOLTAGE
DROP (V)
1.135
1.154
1.174
1.194
1.214
1.233
1.253
1.273
1.292
1.312
1.332
1.351
1.371
1.391
1.410
1.430
1.450
1.470
1.489
1.509
1.529
1.548
1.568
1.588
1.607
1.627
1.647
1.666
1.686
1.706
1.726
1.745
1.765
1.785
PRESSURE
(psig)
136 138 140 142 144 146 148 150 152 154 156 158 160 162 164 166 168 170 172 174 176 178 180 182 184 186 188 190 192 194 196 198 200 202
VOLTAGE DROP (V)
1.804
1.824
1.844
1.863
1.883
1.903
1.922
1.942
1.962
1.982
2.001
2.021
2.041
2.060
2.080
2.100
2.119
2.139
2.159
2.178
2.198
2.218
2.237
2.257
2.277
2.297
2.316
2.336
2.356
2.375
2.395
2.415
2.434
2.454
PRESSURE
(psig)
204 206 208 210 212 214 216 218 220 222 224 226 228 230 232 234 236 238 240 242 244 246 248 250 252 254 256 258 260 262 264 266 268 270
VOLTAGE DROP (V)
2.474
2.493
2.513
2.533
2.553
2.572
2.592
2.612
2.631
2.651
2.671
2.690
2.710
2.730
2.749
2.769
2.789
2.809
2.828
2.848
2.868
2.887
2.907
2.927
2.946
2.966
2.986
3.005
3.025
3.045
3.065
3.084
3.104
3.124
48/50PG and PM
MAJOR SYSTEM COMPONENTS
General
55
48/50PG and PM
C08549
Fig. 25 − 48PG03−16 Control Wiring Schematic
56
48/50PG and PM
C08550
Fig. 26 − 50PG03−16 Control Wiring Schematic
57
48/50PG and PM
Fig. 27 − Typical 48/50PG03−14 Power Wiring Schematic and Legend (48/50PG08−14 Shown)
C101249
58
48/50PG and PM
Fig. 28 − Typical 48PG03−16 with Humidi−MiZert System Control Wiring Schematic(48PG08−16 Shown)
C08552
59
48/50PG and PM
Fig. 29 − Typical 50PG03−16 with Humidi−MiZert System Control Wiring Schematic(50PG08−16 Shown)
C08554
60
48/50PG and PM
Fig. 30 − Typical 48/50PG03−14 with Humidi−MiZert System Power Wiring Schematic and Legend
C101250
(48/50PG08−14 Shown)
61
48/50PG and PM
C08471
Fig. 31 − Typical 48PM16−28 Control Schematic
62
48/50PG and PM
Fig. 32 − Typical 48PM16−28 with Humidi−MiZert System Control Schematic
C08062
63
48/50PG and PM
C101251
Fig. 33 − Typical 50PM16−28 Control Schematic
64
48/50PG and PM
Fig. 34 − Typical 50PM16−28 with Humidi−MiZert Control Schematic
C08064
65
48/50PG and PM
C10902
Fig. 35 − Typical 48/50PM16−28 Power Schematic
66
48/50PG and PM
Fig. 36 − Typical 48/50PM16−28 with Humidi−MiZert System Power Schematic
C09213
67
TRAN 2
OFC
CCHR
MBB
ECB
CB
48/50PG and PM
OFM
TRAN 1
UNIT CONTROL BOX
IFC
COMPRESSOR
CAPACITOR
SCT
CONTACTOR
SENSOR
CURRENT
(LOW VOLTAGE TERMINAL STRIP)
TB1
SAT
TXV
DISPLAY
MARQUEE
SCROLLING
Fig. 37 − Typical 48/50PG03−16 Unit Component Arrangement (Sizes 03−07 Shown)
IFM
HPS
SSP
OAT
IGC
COMPRESSOR(S)
C07025
68
48/50PG and PM
C08067
Fig. 38 − 48/50PM16−28 Component Arrangement
69
48/50PG and PM
Fig. 39 − 48/50PM16−28 with Humidi−MiZert Component Arrangement
C101252
70
Main Base Board (MBB)
See Fig. 40 and Table 23. The MBB is the center of the ComfortLink control system. It contains the major portion of the operating software and controls the operation of the unit. The MBB continuously monitors input/output channel information received from its inputs and from the Economizer Control Board (ECB). The MBB receives inputs from thermistors and transducers.
The MBB also receives the Current Sensor inputs for compressors and other discrete or digital inputs. The MBB reads space temperature (SPT) from either a T-55, T-56 or T-58 device and space temperature offset (SPTO) from a T-56 device. See Field-Installed Accessories section. The MBB controls 9 relays.
NOTE: The Main Base Board (MBB) has a 3-position instance jumper that is factory set to ‘1.’ Do not change this setting.
RED LED - STATUS GREEN LED -
LEN (LOCAL EQUIPMENT NETWORK)
CEPL130346-01
J1
J6
J4
J5
J2
J3
LEN
CCN
STATUS
YELLOW LED ­CCN (CARRIER COMFORT NETWORK)
INSTANCE JUMPER (SET TO 1)
J10
48/50PG and PM
J7
J8
Fig. 40 − Main Base Board (MBB)
J9
C07026
71
Table 23 – MBB Connections
DISPLAY
NAME
Input power from TRAN1 control box 24 VAC J1, 1-3
HUM
FDWN Fire shutdown switch supply/return/space switch input J6, 6 G Thermostat G (Fan) space switch input J7, 2 W2 Thermostat W2 (2nd Stage Heat) space switch input J7, 4 W1 Thermostat W1 (1st Stage Heat) space switch input J7, 6 Y2 Thermostat Y2 (2nd Stage Cool) space switch input J7, 8 Y1 Thermostat Y1 (1st Stage Cool) space switch input J7, 10 FIL.S Filter status switch indoor fan section switch input J9, 2-3 CS.A1 Compressor A1 Current Sensor control box 0-5vdc digital input J9, 4-6 CS.B1 or
CS.A2 CS.C1 or
CS.B1 SPT Space temperature (T55/56) space 10k thermistor J8, 1-2 SPTO or
RAT
48/50PG and PM
OAT Outdoor air temperature outdoor coil support 10k thermistor J8, 5-6
SAT Supply air temperature
SCT.A Saturated condenser temperature, circuit A outdoor coil, circuit A 5k thermistor J8, 9-10 SCT.B Saturated condenser temperature, circuit B outdoor coil, circuit B 5k thermistor J8, 11-12 SCT.C Saturated condenser temperature, circuit C outdoor coil, circuit C 5k thermistor J8, 13-14 FAN.S Fan status switch indoor fan section switch input J8, 15-16
SSP.A Suction pressure, circuit A compressor A suction
SSP.B Suction pressure, circuit B compressor B suction
SSP.C Suction pressure, circuit C compressor C suction
CRC Cooling Reheat Control relay J10, 3 CMP.C or
OFC.2 COMP.B Compressor B1 relay relay J10, 9 COMP.A Compressor A1 relay relay J10, 11 CCH or
OFC.3 OFC.1
OFC.2 or RH2.B
OFC.1 or RH2.A
IDF Indoor fan relay relay J10, 21 ALRM Alarm relay relay J10, 23 HT.1 Heat Stage 2 relay relay J10, 25 HT.2 Heat Stage 1 relay relay J10, 27
POINT DESCRIPTION SENSOR LOCATION TYPE OF I/O
INPUTS
IGC Fan Request or Humidistat switch input
Compressor B1 or A2 Current Sensor
Compressor C1or B1 Current Sensor
Space temperature offset (T56) or Return air temperature
Compressor C1 relay or Outdoor fan 2 relay
Crankcase heat relay or Outdoor fan 3 relay or Outdoor fan 1 relay
Outdoor fan 2 relay or Reheat 2 valve circuit B & C
Outdoor fan 1 relay or Reheat 2 valve circuit A
COMMUNICATION
Local Equipment Network (LEN) Carrier Comfort Network (CCN) communication J5, 5-7 Network device power 24 VAC J5, 9-10 Scrolling Marquee Display (LEN) communication J4, 1-3 Scrolling Marquee Display power 24 VAC J4, 5-6 Optional ECB (LEN) communication J3, 1-3 Optional ECB power 24 VAC J2, 1-2
gas section /
space
control box 0-5vdc digital input J9, 7-9
control box 0-5vdc digital input J9, 10-12
space or return 10k thermistor J8, 2-3
indoor fan housing, or
supply duct
OUTPUTS
relay J10, 6
relay J10, 13
relay J10, 16
relay J10, 19
switch input J6, 4
10k thermistor J8, 7-8
0-5 VDC pressure
transducer
0-5 VDC pressure
transducer
0-5 VDC pressure
transducer
communication J5, 1-3
CONNECTION
PIN NUMBER
J8, 18-20
J8, 21-23
J8, 24-26
72
Economizer Control Board (ECB)
The ECB controls the economizer actuator. (See Fig. 41 and Table
24.) The control signal from the ECB uses either the MFT (Multi-Function Technology) digital communication protocol or a 4 to 20 mA output signal as defined by the configuration Configuration→ECON→E.CTL. The ECB has inputs for Indoor Air Quality (IAQ), Outdoor Air Quality (OAQ), enthalpy and RH sensor. It also controls two power exhaust outputs.
By digitally communicating with the ECB, the economizer actuator is able to provide the damper position and diagnostic information to the ComfortLink controller. The damper position is displayed at Outputs→ECON→EC.AP. Diagnostic information is displayed via Alert T414. More information about these alarms is contained in the Alarms and Alerts section.
NOTE: The Economizer Control Board (ECB) has a 4-position DIP switch that is factory set to ‘0’ (ON, towards the center of the board). Do not change this setting.
48/50PG and PM
C07027
Fig. 41 − Economizer Control Board (ECB)
73
Table 24 – ECB Connections
DISPLAY
NAME
Input power from MBB control box 24 VAC J1, 1-2 RM.OC Remote occupancy switch field installed switch input J4, 2 ENTH or
IAQ.S IAQ Indoor air quality sensor return/space 0-20 mA J5, 2 OAQ or
SP.RH Sensor Common Ground J5, 3 Actuator Common Ground J7, 3
Output power to enthalpy switch 24 VAC J4, 3 Output power for loop power sensors 24 VDC J5, 1 Output power to economizer actuator 24 VAC J7, 2 PE.1 Power exhaust 1 relay relay J8, 3 PE.2 Power exhaust 2 relay relay J8, 6 EC.CP or
F.SPD
48/50PG and PM
Local Equipment Network (LEN) communication J2, 1-3 Carrier Comfort Network (CCN) communication J3 EC.CP &
EC.AP
POINT DESCRIPTION SENSOR
Outdoor enthalpy switch, or Indoor air quality switch
Outdoor air quality sensor, or Relative humidity sensor
Commanded Economizer position or Commanded Fan Speed
Economizer actuator position (digital control)
LOCATION
INPUTS
economizer, or
return/space
field installed 0-20 mA J5, 5
OUTPUTS
COMMUNICATION
TYPE OF I/O CONNECTION
switch input J4, 4
0-20 mA J9, 1
MFT
communication
PIN NUMBER
J7, 1
74
Integrated Gas Control (IGC) Board
The IGC is provided on gas heat units. (See Fig. 42 and Table 25.) The IGC controls the direct spark ignition system and monitors the rollout switch, limit switch, and induced-draft motor Hall Effect switch.
RED LED-STATUS
The IGC is equipped with an LED (light-emitting diode) for diagnostics. See the Troubleshooting section for more information.
48/50PG and PM
Fig. 42 − Integrated Gas Control (IGC) Board
Table 25 – IGC Connections
TERMINAL
LABEL
RT, C Input power from TRAN 1 control box 24 VAC SS Speed sensor gas section analog input J1, 1-3 FS, T1 Flame sensor gas section switch input W Heat stage 1 MBB 24 VAC J2, 2 RS Rollout switch gas section switch input J2, 5-6 LS Limit switch gas section switch input J2, 7-8 CS Centrifugal switch (not used) switch input J2, 9-10
L1, CM Induced draft combustion motor gas section line VAC IFO Indoor fan request control box relay J2, 1 GV (W1) Gas valve (heat stage 1) gas section relay J2, 12 GV (W2) Gas Valve (heat stage 2, from MBB) gas section Not on IGC
POINT DESCRIPTION SENSOR LOCATION TYPE OF I/O
INPUTS
OUTPUTS
CONNECTION
PIN NUMBER
C07028
75
Low Voltage Terminal Strip
(TB1 on PG03−16 size and TB2 on PG20−28 and PM16−28 size units)
This circuit board provides a connection point between the major control boards and a majority of the field-installed accessories. (See Fig. 43 and Table 26.)
17
J10
SEPARATION OF CIRCUITS TO EACH 24V TRANSFORMER MUST BE MAINTAINED
1 2 3 4 5 6 7 8 9 10 R Y1 Y2
14
J11
W2 G C X 1 2 1 2 3 1 2
W1
Fig. 43 − Low−Voltage Terminal Strip
The circuit breakers for the low voltage control transformers, interface connection for the Carrier Comfort Network (CCN) communication, and interface connection for the Local Equipment Network (LEN) communications are also located on the low voltage terminal strip.
J13
7
RUN TEST
FIRE SHUTDOWN
7
J12
T55
FAN STA TUS
8
(COM)
(+)
LEN
CCN
(-)
SHIELD
CCN
C07029
48HG500382
48/50PG and PM
TERMINAL LABEL
FIRE SHUTDOWN
HUMIDISTAT 1*
FIRE SHUTDOWN
HUMIDISTAT 2*
FAN STATUS
* Refer to Third Party Control section for more information
Table 26 – Field Connection Terminal Strip
DISPLAY
NAME
1 24 VDC Sensor Loop power 24 VDC output J10, 17 2 IAQ Indoor air quality sensor return/space 4-20 mA input J10, 16 3 Air quality & humidity sensor common Ground J10, 15
4
5 RM.OC Remote occupancy switch field installed 24 VAC input J10, 13 6 Switch power (ENTH, RM.OC, IAQ.S) 24 VAC output J10, 11-12
7
8* EC.CP
9 Economizer signal common Ground J10, 3-5
10* EC.AP
R 24 VAC power 24 VAC output J11, 11-14 Y1 Y1 Thermostat Y1 (1st stage cool) space 24 VAC input J11,10 Y2 Y2 Thermostat Y2 (2nd stage cool) space 24 VAC input J11, 9
W1 W1 Thermostat W1 (1st stage heat) space 24 VAC input J11, 7-8 W2 W2 Thermostat W2 (2nd stage heat) space 24 VAC input J11, 6
G G Thermostat G (Fan) space 24 VAC input J11, 5
C 24 VAC common 24 VAC output J11, 2-4
X ALRM Alarm output (normally open) 24 VAC output J11, 1
or
or
T55
1-2
T55
2-3
1-2 LEN Local Equipment Network (LEN) communication J13, 6-8, 4-5
CCN Carrier Comfort Network (CCN) communication J13, 1-3, 4-5
OAQ or SP.RH
ENTH or IAQ.S
FDWN or HUM
FDWN or HUM
SPT Space temperature (T55/56) space 10k thermistor J12, 4-5
SPTO or RAT
NOT USED J12, 1-2
POINT DESCRIPTION
Outdoor air quality sensor or Relative humidity sensor
Outdoor enthalpy switch, or Indoor air quality switch
Economizer commanded position actu ator (when in digital control)
Economizer position feedback (when in analog control)
Fire shutdown switch 24 VAC output or Humidistat switch input
Fire shutdown switch input or Humidistat switch 24 VAC output
Space temperature offset (T56) or Return air temperature
SENSOR
LOCATION
field installed 4-20 mA input J10, 14
economizer, or
return/space
economizer 2-10 VDC output J10, 6-8
economizer
supply/return/
space
supply/return/
space
space or return 10k thermistor J12, 3-4
TYPE OF I/O
24 VAC input J10, 9-10
communication
2-10 VDC output
switch input J12, 7
switch input J12, 6
CONNECTION
PIN NUMBER
J10, 1-2
76
Scrolling Marquee Display
This device is the keypad interface used to access rooftop information, read sensor values, and test the unit. (See Fig. 44.) The Scrolling Marquee display is a 4-key, 4-character, 16-segment LED (light-emitting diode) display. Eleven mode LEDs are located on the display as well as an Alarm Status LED. See Basic Control Usage section for further details.
Accessory Navigatort Display
The accessory hand-held Navigator display can be used with 48/50PG and PM units. (See Fig. 45.) The Navigator display operates the same way as the Scrolling Marquee device. The Navigator display plugs into the LEN port on either TB or the ECB board.
MODE
Run Status Service Test Temperature Pressures Setpoints Inputs Outputs Configuration Time Clock Operating Modes Alarms
Fig. 45 − Accessory Navigatort Display
Alarm Status
ESCAPE
ENTER
Fig. 44 − Scrolling Marquee
C
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m
N
A
T
IM
E
E
1
W
2
T
L
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5
4
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C06320
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Sta
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C06321
Carrier Comfort Network (CCN)R Interface
The units can be connected to the CCN if desired. The communication bus wiring is a shielded, 3-conductor cable with drain wire and is field supplied and installed. The system elements are connected to the communication bus in a daisy chain arrangement. (See Fig. 46.) The positive pin of each system element communication connector must be wired to the positive pins of the system elements on either side of it. This is also required for the negative and signal ground pins of each system element. Wiring connections for CCN should be made at TB. (See Fig. 18.) Consult the CCN Contractor’s Manual for further information.
NOTE: Conductors and drain wire must be 20 AWG (American Wire Gauge) minimum stranded, tinned copper. Individual conductors must be insulated with PVC, PVC/nylon, vinyl, Teflon, or polyethylene. An aluminum/polyester 100% foil shield and an outer jacket of PVC, PVC/nylon, chrome vinyl, or Teflon with a minimum operating temperature range of –20C to 60C is required. See Table below for acceptable wiring.
MANUFACTURER PART NO.
Alpha 2413 or 5463
Belden 8772
Carol C2528
West Penn 302
It is important when connecting to a CCN communication bus that a color-coding scheme be used for the entire network to simplify the installation. It is recommended that red be used for the signal positive, black for the signal negative and white for the signal ground. Use a similar scheme for cables containing different colored wires.
1. Turn off power to the control box.
2. Cut the CCN wire and strip the ends of the red (+), white (ground), and black (–) conductors. (Substitute appropriate colors for different colored cables.)
3. Connect the red wire to (+) terminal on TB1, the white wire to COM terminal, and the black wire to the (–) terminal.
4. The RJ14 CCN connector on TB1 can also be used, but is only intended for temporary connection (for example, a laptop computer running Carrier network software).
5. Restore power to unit.
IMPORTANT: A shorted CCN bus cable will prevent some routines from running and may prevent the unit from starting. If abnormal conditions occur, unplug the connector. If conditions return to normal, check the CCN connector and cable. Run new cable if necessary. A short in one section of the bus can cause problems with all system elements on the bus.
48/50PG and PM
77
CCN BUS
48/50PG and PM
REMOTE CCN SITE
BUILDING SUPERVISOR
NETWORK OPTIONS
AUTODIAL GATEWAY
TERMINAL SYSTEM MANAGER
CL
CL
ROOFTOP UNIT
ROOFTOP UNIT
CL
ROOFTOP UNIT
HEATING/COOLING UNITS
TCU
DAV AIR TERMINAL
TCU
DAV AIR TERMINAL
CL
CL
ROOFTOP UNIT
ROOFTOP UNIT
TCU
CCN -- Carrier Comfort Networkr
LEGEND
CL -- ComfortLinkt Controls DAV -- Digital Air Volume HVAC -- Heating, Ventilation, and Air Conditoning TCU -- Terminal Control Unit
TO ADDITIONAL TERMINALS
DAV FAN POWERED MIXING BOX
NON CARRIER HVAC EQUIPMENT
COMFORT
CONTROLLER
AIR DISTRIBUTION-DIGITAL AIR VOLUME CONTROL (DAV)
Fig. 46 − CCN System Architecture
EnergyX
Units equipped with Optional EnergyX have a factory installed energy recovery ventilator (ERV). The ERV is used to pre−condition outside air as it is brought into the rooftop unit. To do this it uses building air and an enthalpy wheel. It can also have a wheel bypass that acts as an economizer to allow free cooling. In Appendix A there are ERV points for display under Outside Air Unit (OAU) menus. These points and ERV specifics are explained in the EnergyXv2 Supplement Installation Instructions contained in the unit’s information packet.
C07030
78
Field-Installed Accessories
Space Temperature Sensor (T−55)
The T-55 space temperature sensor (part no. 33ZCT55SPT) is a field-installed accessory. The sensor is installed on a building interior wall to measure room air temperature. The T-55 sensor also includes an override button on the front cover to permit occupants to override the Unoccupied Schedule (if programmed). The jumper wire in the installer’s packet must be connected between R and W1 when using a T-55 device.
TB−T55−1 Sensor Input.......
TB−T55−2 Sensor Common.......
Space Temperature Sensor (T−56)
The T-56 space temperature sensor (part no. 33ZCT56SPT) is a field-installed accessory. This sensor includes a sliding scale on the front cover that permits an occupant to adjust the space temperature set point remotely. The T-56 sensor also includes an override button on the front cover to allow occupants to override the unoccupied schedule (if programmed). The jumper wire in the installer’s packet must be connected between R and W1 when using a T-56 device.
TB−T55−1 Sensor Input.......
TB−T55−2 Sensor Common.......
TB−T55−3 Setpoint Offset Input.......
Space Temperature Sensor (T−58)
The T-58 space temperature sensor (part no. 33ZCT58SPT) is a field-installed accessory. The T-58 sensor communicates with the ComfortLink controller, providing space temperature, heating and cooling set points, and mode operation information. The jumper wire in the installer’s packet must be connected between R and W1 when using a T-58 device.
Refer to the T-58 installation instructions for information on installing and configuring the T-58 sensor.
Each T-58 sensor must have a unique address on the CCN. Each T-58 sensor must also be configured with the address of the unit control it is communicating to.
Space Temperature Sensor Averaging
See Fig. 47 for space temperature averaging with T-55 sensors only. If the use of one T-56 sensor is required, refer to Fig. 48.
48/50PG and PM
79
RED
T
BLK
RED BLK
48/50PG and PM
LEGEND
B -- Terminal Block ______ -- Factory Wiring _ _ _ _ -- Field Wiring
TB1-T55
1
2
TO MAIN BASE BOARD
TB1-T55
1 2
TO MAIN BASE BOARD
RED
BLK
SENSOR 1 SENSOR 2 SENSOR 3 SENSOR 4
RED
BLK
RED BLK
SPACE TEMPERATURE AVERAGING --4 T-55 SENSOR APPLICATION
RED BLK
BLK
SENSOR 1
RED
RED BLK
SENSOR 2
RED BLK
RED BLK
RED
BLK
SENSOR 3
SENSOR 6SENSOR 5
BLK
SENSOR 4
RED
RED BLK
RED
BLK
SENSOR 8SENSOR 7 SENSOR 9
SPACE TEMPERATURE AVERAGING --9 T-55 SENSOR APPLICATION
C07032
Fig. 47 − Space Temperature Sensor Averaging
RED BLK
TB1-T55
1
2
TO MAIN
BASE
BOARD
RED BLK
RED BLK
RED
BLK
RED BLK
TB1-T55
3
TO MAIN
BASE
BOARD
T-55 SENSOR 1 T-55 SENSOR 2 T-55 SENSOR 3 T-56 SENSOR 4
Fig. 48 − Space Temperature Sensor Averaging with 3 T−55 Sensors and One T−56 Sensor
WHT
C07033
80
Carrier Accessory Kits
There are specific accessory kits sold for various field installed accessories. These kits vary based on model, size, voltage, manufacture date, and duct orientation. Some of these kits include Economizer, Power Exhaust, and Electric Heat. Refer to the Controls Quick Set−Up section for configuration and more information on these accessories.
Two−Position Damper
The two-position outdoor air damper accessory usage depends on model size and return duct orientation. This accessory wires directly into the low voltage circuit for the indoor fan control. No other control configuration is needed.
Indoor Air Quality
The indoor air quality (IAQ) sensor (part no. 33ZCSENCO2) is a field-installed accessory which measures CO When installing this sensor, an ECB board must be installed and the unit must be configured for IAQ use by setting Configuration→AIR.Q→IA.CF to a value of 1, 2, or 3. See the Indoor Air Quality section for more information.
TB−24−20mA Input..........
TB−3 Sensor Common..........
TB−R 24vac Output.........
TB−C Common (GND).........
levels in the air.
2
Outdoor Air Quality
The outdoor air quality (OAQ) sensor is a field-installed accessory that measures CO ECB board must be installed and the unit must be configured for OAQ use by setting Configuration→AIR.Q→OA.CF to a value of 1 or 2. See the Indoor Air Quality section for more information.
TB−24−20mA Input..........
TB−3 Sensor Common..........
TB−R 24vac Output.........
TB−C Common (GND).........
levels in the air. When installing this sensor, an
2
Smoke Detectors
TB−Fire Shutdown−1 Dry Contact Source.............
TB−Fire Shutdown−2 Discrete Input to Board...........
TB−R 24vac Output.........
TB−C Common (GND).........
NOTE: When a Humidi-Mizer system is installed, the inputs to the fire shutdown are moved to the control harness. See the Third Party Control section for more information.
Filter Status
The filter status accessory (part no. CRSTATUS002B00) is a field-installed accessory. This accessory detects plugged filters. When installing this accessory, the unit must be configured for filter status by setting Configuration→UNIT→FL.SW to normally open (1) or normally closed (2). Normally open (1) is the preferred configuration.
Filter status wires are pre−run in the unit harness and located near the switch installation location. Refer to the Filter Accessory installation instructions for more information.
Fan Status
The fan status accessory (part no. CRSTATUS003B00) is a field-installed accessory. This accessory detects when the indoor fan is blowing air. When installing this accessory, the unit must be configured for fan status by setting Configuration→UNIT→FN.SW to normally open (1) or normally closed (2). Normally open (1) is the preferred configuration.
Fan status wires are pre−run in the unit harness and located near the switch installation location. Refer to the Fan Accessory installation instructions for more information.
NOTE: The fan status terminals on TB1 are NOT to be used.
Enthalpy Sensors
The enthalpy accessories (part no. CRENTSNG002A00 and CRENTDIF002A00) are field-installed accessories. The first accessory (outdoor air only) determines when the enthalpy is low relative to a fixed reference. Adding the second accessory (return air) compares the enthalpy between the outdoor and return airstreams. In each case, the enthalpy 4 to 20 mA signals are converted to a switch output which is read by the ECB. When installing this accessory, the unit must be configured for enthalpy-based control by setting Configuration→ECON→EN.SW to normally open (1). See Fig. 26 and 27 for wiring details.
Normal status is an active switch which tells the control that enthalpy is LOW. The actual switch terminal LOW is normally closed. Refer to the Enthalpy Kit installation instructions for more information on the installation.
Return/Supply Air Temperature Sensor
The temperature sensor (part no. 33ZCSENSAT) is a field-installed accessory which may be installed on the common return air duct and/or the common supply air duct near the unit. The duct return air temperature (RAT) may be selected for display only if the space temperature offset (SPTO) is not used. When installing the sensor, the unit must be configured by setting Configuration→UNIT→RAT.S to YES. Using a RAT will allow differential dry bulb control of the economizer. The duct supply air temperature (SAT) may be used to replace the SAT sensor that is internal to the unit. A supply duct SAT measurement is valid for heating mode display while the factory-standard internal SAT is not valid for heating due to its location upstream of the heating section. When installing the supply duct SAT, the unit must be configured by setting Configuration→UNIT→SAT.H to ENBL. A SAT sensor in the supply duct is the preferred configuration for systems with Carrier variable volume and temperature (VVT) accessory controls.
Space Humidistat
The Space Humidistat (part no. −−HL−−38MG−029) is a wall mounted device with an adjustable setpoint to control humidity levels. The humidistat input is provided on the field connection terminal board. The Space Humidity Switch configuration, Configuration→UNIT→RH.SW, identifies the normally open or normally closed status of this input at LOW humidity.
TB−HUMIDISTAT1 Discrete Input to Board............
TB−HUMIDISTAT2 24 VAC Dry Contact Source.......
NOTE: The humidistat terminals are only in use when the unit is equipped with the Humidi−MiZer factory option.
48/50PG and PM
81
Space Humidity Sensor
The space relative humidity sensor (part no. 33ZCSENDRH−01 duct mount or 33ZCSENSRH−01 wall mount) is a field−installed accessory. The space relative humidity (RHS) may be selected for use if the outdoor air quality sensor (OAQ) is not used and an economizer board is installed. When installing the relative humidity sensor, the unit must be configured by setting Configuration→UNIT→RH.S to YES.
TB−1 24 VDC Loop Power..........
TB−44−20mA Input Signal..........
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal injury or death.
Before performing service or maintenance operations on unit, turn off main power switch to unit and install lockout tag. Ensure electrical service to rooftop unit
48/50PG and PM
agrees with voltage and amperage listed on the unit rating plate.
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could cause personal injury, death and/or equipment damage.
Puron (R−410A) refrigerant systems operate at higher pressures than standard R−22 systems. Do not use R−22 service equipment or components on Puron refrigerant equipment.
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal injury, death and/or property damage.
1. Improper installation, adjustment, alteration, service, or maintenance can cause property damage, personal injury, or loss of life. Refer to the User’s Information Manual provided with this unit for more details.
2. Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.
What to do if you smell gas:
1. DO NOT try to light any appliance.
2. DO NOT touch any electrical switch, or use any phone in your building.
3. IMMEDIATELY call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions.
4. If you cannot reach your gas supplier, call the fire department.
SERVICE
!
WARNING
!
WARNING
!
WARNING
!
WARNING
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal injury or death.
Disconnect gas piping from unit when pressure testing at pressure greater than 0.5 psig. Pressures greater than
0.5 psig will cause gas valve damage resulting in hazardous condition. If gas valve is subjected to pressure greater than
0.5 psig, it must be replaced before use. When pressure testing field-supplied gas piping at pressures of 0.5 psig or less, a unit connected to such piping must be isolated by closing the manual gas valve(s).
Cleaning
Inspect unit interior at beginning of each heating and cooling season and as operating conditions require. Remove unit top panel and/or side panels for access to unit interior.
Coil Maintenance and Cleaning Recommendation
Routine cleaning of coil surfaces is essential to maintain proper operation of the unit. Elimination of contamination and removal of harmful residues will greatly increase the life of the coil and extend the life of the unit. The following maintenance and cleaning procedures are recommended as part of the routine maintenance activities to extend the life of the coil.
Remove Surface Loaded Fibers
Surface loaded fibers or dirt should be removed with a vacuum cleaner. If a vacuum cleaner is not available, a soft non-metallic bristle brush may be used. In either case, the tool should be applied in the direction of the fins. Coil surfaces can be easily damaged (fin edges can be easily bent over and damage to the coating of a protected coil) if the tool is applied across the fins.
NOTE: Use of a water stream, such as a garden hose, against a surface loaded coil will drive the fibers and dirt into the coil. This will make cleaning efforts more difficult. Surface loaded fibers must be completely removed prior to using low velocity clean water rinse.
Periodic Clean Water Rinse
A periodic clean water rinse is very beneficial for coils that are applied in coastal or industrial environments. However, it is very important that the water rinse is made with very low velocity water stream to avoid damaging the fin edges. Monthly cleaning as described below is recommended.
Routine Cleaning of NOVATION Heat Exchanger Coil Surfaces
To clean the NOVATION Heat Exchanger condenser coil, chemicals are NOT to be used; only water is approved as the cleaning solution. Only clean portable water is authorized for cleaning NOVATION Heat Exchanger condensers. Carefully remove any foreign objects or debris attached to the coil face or trapped within the mounting frame and brackets. Using a high pressure water sprayer, purge any soap or industrial cleaners from hose and/or dilution tank prior to wetting the coil.
Clean condenser face by spraying the coil core steadily and uniformly from top to bottom directing the spray straight into or toward the coil face. Do not exceed 900 psig or a 45 degree angle; nozzle must be at least 12” (30 cm) from the coil face. Reduce pressure and use caution to prevent damage to air centers (fins). Do not fracture the braze between air centers and refrigerant tubes. Allow water to drain from the coil core and check for refrigerant leaks prior to startup.
82
NOTE: Please see the NOVATION Heat Exchanger Condenser Service section for specific information on the NOVATION Heat Exchanger coil.
!
CAUTION
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in damage to equipment.
Chemical cleaner should NOT be used on the aluminum NOVATION condenser. Damage to the coil can occur. Only approved cleaner is recommended.
Routine Cleaning of Round−Tube Coil Surfaces
Monthly cleaning with Totaline environmentally sound coil cleaner is essential to extend the life of coils. This cleaner is available from Carrier Replacement parts division as part number P902-0301 for a one gallon container, and part number P902-0305 for a 5 gallon container. It is recommended that all round−tube coils, including standard aluminum, pre-coated, copper/copper or E-coated coils be cleaned with the Totaline environmentally sound coil cleaner as described below. Coil cleaning should be part of the unit’s regularly scheduled maintenance procedures to ensure long life of the coil. Failure to clean the coils may result in reduced durability in the environment.
Avoid the use of:
coil brightenersacid cleaning prior to paintinghigh pressure washerspoor quality water for cleaning
Totaline environmentally sound coil cleaner is non-flammable, hypoallergenic, non−bacterial, and a USDA accepted biodegradable agent that will not harm the coil or surrounding components such as electrical wiring, painted metal surfaces, or insulation. Use of non-recommended coil cleaners is strongly discouraged since coil and unit durability could be affected.
Totaline Environmentally Sound Coil Cleaner Application Equipment
1
/2 gallon garden sprayer
2water rinse with low velocity spray nozzle
!
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in corrosion and
damage to the unit.
Harsh chemicals, household bleach or acid or basic cleaners
should not be used to clean outdoor or indoor coils of any
kind. These cleaners can be very difficult to rinse out of the
coil and can accelerate corrosion at the fin/tube interface
where dissimilar materials are in contact. If there is dirt
below the surface of the coil, use the Totaline
environmentally sound coil cleaner as described above.
!
CAUTION
UNIT RELIABILITY HAZARD
Failure to follow this caution may result in reduced unit performance.
High velocity water from a pressure washer, garden hose, or compressed air should never be used to clean a coil. The force of the water or air jet will bend the fin edges and increase airside pressure drop.
Totaline Environmentally Sound Coil Cleaner Application Instructions
1. Proper eye protection such as safety glasses is recommended during mixing and application.
2. Remove all surface loaded fibers and dirt with a vacuum cleaner as described above.
3. Thoroughly wet finned surfaces with clean water and a low velocity garden hose, being careful not to bend fins.
4. Mix Totaline environmentally sound coil cleaner in a
1
2
/2 gallon garden sprayer according to the instructions
included with the cleaner. The optimum solution temperature is 100F.
NOTE: Do NOT USE water in excess of 130F, as the enzymatic activity will be destroyed.
5. Thoroughly apply Totaline environmentally sound coil cleaner solution to all coil surfaces including finned area, tube sheets and coil headers.
6. Hold garden sprayer nozzle close to finned areas and apply cleaner with a vertical, up-and-down motion. Avoid spraying in horizontal pattern to minimize potential for fin damage.
7. Ensure cleaner thoroughly penetrates deep into finned areas.
8. Interior and exterior finned areas must be thoroughly cleaned.
9. Finned surfaces should remain wet with cleaning solution for 10 minutes.
10. Ensure surfaces are not allowed to dry before rinsing. Reapplying cleaner as needed to ensure 10-minute saturation is achieved.
11. Thoroughly rinse all surfaces with low velocity clean water using downward rinsing motion of water spray nozzle. Protect fins from damage from the spray nozzle.
Condensate Drain Pan (48/50PG03−14 Units)
Check and clean each year at the start of the cooling season. In winter, keep drains and traps dry.
To clean the condensate pan:
1. Disconnect condensate drain system from side or bottom drain connection.
2. Remove and clean trap.
3. Remove 4 screws securing condensate pan access cover to unit. Save screws and panel.
4. Slide condensate pan out from unit and clean. Pan is made of non-corrosive plastic. Use a mild cleaner to remove heavy deposits of dirt and grime.
5. Replace pan in unit.
6. Replace condensate pan access cover with 4 screws saved from Step 3.
7. Re-attach and prime condensate trap.
8. Connect condensate drainage system.
48/50PG and PM
83
Condensate Drain Pan (48/50PM16−28 Units)
Check and clean each year at the start of the cooling season. An access panel is located above the condensate connection to allow easy clean out of the condensate pan. The first time the panel is removed, the insulation behind the access panel will need to be cut away. Carefully cut the insulation with a knife or blade on three sides so the insulation can be folded out of the way during cleaning. Be careful not to damage components behind the insulation while cutting. Once cleaning is completed, fold the insulation back into place and secure the access panel in the original position.
Filters
Clean or replace at start of each heating and cooling season, or more often if operating conditions require. Refer to unit Installation Instructions for type and size.
Outdoor−Air Inlet Screens
Clean screens with steam or hot water and a mild detergent. Do not use throwaway filters in place of screens. See unit installation instructions for quantity and size.
Main Burner (48PG and PM)
At the beginning of each heating season, inspect for deterioration
48/50PG and PM
or blockage due to corrosion or other causes. Observe the main burner flames. Refer to Main Burners section.
Flue Gas Passageways (48PG and PM)
The flue collector box and heat exchanger cells may be inspected by opening heat section access door (Fig. 5), flue box cover, and main burner assembly. (See Fig. 50.) Refer to Main Burners section for burner removal sequence. If cleaning is required, clean tubes with a wire brush. Use Caution with ceramic heat exchanger baffles. When installing retaining clip, be sure the center leg of the clip extends inward toward baffle. (See Fig. 49.)
CERAMIC BAFFLE
CLIP
NOTE: One baffle and clip will be in each upper tube of the heat exchanger.
Combustion−Air Blower
Clean periodically to assure proper airflow and heating efficiency. Inspect blower wheel every fall and periodically during heating season. For the first heating season, inspect blower wheel bi-monthly to determine proper cleaning frequency.
To inspect blower wheel, open heat section door. Using a flashlight, look into the flue exhaust duct to inspect. If cleaning is required, remove motor and wheel assembly by removing the screws holding the flue box cover to the flue box. (See Fig. 50 or
51.) Remove the screws holding the inducer housing to the inlet plate. The wheel can then be removed from the motor shaft and cleaned with a detergent or solvent. Replace the wheel onto the motor shaft in the correct position and reassemble the flue cover onto the flue box.
Fig. 49 − Removing Heat Exchanger Ceramic
Baffles and Clips
C07260
Lubrication
Compressors
Each compressor is charged with the correct amount of oil at the factory.
!
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in damage to unit components.
The compressor is in a Puron refrigerant system and uses a polyolester (POE) oil. This oil is extremely hygroscopic, meaning it absorbs water readily. POE oils can absorb 15 times as much water as other oils designed for HCFC and CFC refrigerants. Avoid exposure of the oil to the atmosphere.
Polyolester (POE) compressor lubricants are known to cause long term damage to some synthetic roofing materials. Exposure, even if immediately cleaned up, may cause roofing materials to become brittle (leading to cracking) within a year. When performing any service which may risk exposure of compressor oil to the roof, take appropriate precautions to protect roofing. Procedures which risk oil leakage include compressor replacement, repairing refrigerant leaks, and replacing refrigerant components. To prepare rooftop:
1. Cover extended roof work area with an impermeable plastic dropcloth or tarp. Make sure a 10 x 10 ft area around the work area is covered.
2. Cover area in front of the unit service panel with a terry cloth shop towel to absorb lubricant spills and prevent run-offs. Towel will also protect dropcloth from tears caused by tools or components.
3. Place terry cloth shop towel inside the unit directly under components to be serviced to prevent spills through the bottom of the unit.
4. Perform the required service.
5. Remove and dispose of any oil contaminated material per local codes.
Indoor Fan Shaft Bearings (Sizes 03−14)
The indoor fan has permanently sealed bearings. No field lubrication is necessary.
Indoor Fan Shaft Bearings (Sizes 16−28)
Lubricate bearings at least every 6 months with suitable bearing grease. Typical lubricants are given below:
MANUFACTURER LUBRICANT
Texaco
Mobil
Sunoco
Texaco
* Preferred lubricant because it contains rust and oxidation inhibitors.
Regal AFB‐2*
Mobilplex EP No. 1
Prestige 42
Multifak 2
84
ROLLOUT SWITCH
HEAT EXCHANGER SECTION
MAIN BURNER SECTION
Fig. 50 − 48PG03−14 Typical Gas Heating Section
(48PG03−07 Shown)
INDUCED DRAFT MOTOR
COMBUSTION FAN HOUSING
MAIN GAS VALVE
C07037
4. For 48/50PG03−14 units, disconnect the electrical wires connected to the slide−out fan deck (supply air thermistor and fan status switch if installed). Wires may be damaged if not disconnected. For 48/50PM16−28 units, disconnect the limit switch wires located on the right side of the fan deck (48 series only). Other wires do not need to be disconnected.
5. Fan deck can now be slid out to access serviceable components.
!
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in damage to the unit.
DO NOT SLIDE FAN DECK OUT PAST THE FAN DECK STOP. If further access is required, the fan deck must be supported. Make sure plugs and wiring are not pinched between fan housing and unit sheet metal post.
6. To replace fan deck to operating position, slide fan deck back into the unit. Secure with the two no. 10 screws removed in Step 3.
7. Re-attach electrical wires.
8. Close fan section access door.
9. Restore power to unit.
48/50PG and PM
COMBUSTION
HEAT EXCHANGER SECTION
IGC BOARD (HIDDEN)
MAIN BURNER SECTION
FAN HOUSING INDUCED
DRAFT MOTOR
MAIN GAS VALVE
C07259
Fig. 51 − 48PM16−28
Typical Gas Heating Section
Condenser and Evaporator−Fan Motor Bearings
The condenser-fan and evaporator-fan motors have permanently sealed bearings, so no field lubrication is necessary.
Economizer or Manual Outside Air Damper
If blade adjustment is required, refer to unit or accessory installation instructions.
Evaporator Fan Service and Replacement
The units feature a slide-out fan deck for easy servicing of the indoor-fan motor, pulleys, belt, and bearings. To service components in this section, perform the following procedure:
1. Turn off unit power.
2. Open the fan section access door.
3. Remove two no. 10 screws at front of slide-out fan deck. Save screws. (See Fig. 52 or 53.)
MOUNTING BASE
SCREW (HIDDEN)
LIMIT SWITCH QUICK CONNECT (48PM ONLY)
MOTOR
SLIDE-OUT FAN DECK
SCREW
Fig. 52 − 48/50PG03−14
Evaporator−Fan Motor Adjustment
FAN PULLEY
Fig. 53 − 48/50PM16−28
Evaporator−Fan Motor Adjustment
MOTOR PULLEY
FAN DECK STOP
FAN PULLEY
C06177
MOTOR PULLEY (HIDDEN)
MOTOR
MOUNTING BASE
SLIDE-OUT FAN DECK
C08008
85
48PM VOLTAGE
16
20
24
28
50PM VOLTAGE
16
20
48/50PG and PM
24
28
Table 27 – Belt Tension Adjustment
BELT TENSION (lb)
Unit Model Number Position 10
A,J B,K C,L D,M E,N F, P G,Q H,R
230 4.8 5.1 5.6 4.5 NA 4.7 5.0 5.5 460 4.8 5.1 5.6 4.5 NA 4.7 5.0 5.5 575 5.3 5.1 5.6 4.5 NA 5.2 5.0 5.5 230 4.8 5.1 5.6 4.5 NA 4.7 5.0 5.5 460 4.8 5.1 5.6 4.5 NA 4.7 5.0 5.5 575 5.3 5.1 5.6 4.5 NA 5.2 5.0 5.5 230 4.8 5.1 5.6 4.5 NA 4.7 5.0 5.5 460 4.8 5.1 5.6 4.5 NA 4.7 5.0 5.5 575 5.3 5.1 5.6 4.5 NA 5.2 5.0 5.5 230 4.5 5.4 5.9 4.5 4.5 5.4 5.9 4.5 460 4.5 5.4 5.9 4.5 4.5 5.4 5.9 4.5 575 4.5 5.4 5.9 4.5 4.5 5.4 5.9 4.5
BELT TENSION (lb)
Unit Model Number Position 10
A,J B,K C,L D,M E,N F, P G,Q H,R
230 4.8 5.1 5.6 4.5 4.8 5.1 5.6 4.5 460 4.8 5.1 5.6 4.5 4.8 5.1 5.6 4.5 575 5.3 5.1 5.6 4.5 5.3 5.1 5.6 4.5 230 4.8 5.1 5.6 4.5 4.8 5.1 5.6 4.5 460 4.8 5.1 5.6 4.5 4.8 5.1 5.6 4.5 575 5.3 5.1 5.6 4.5 5.3 5.1 5.6 4.5 230 4.8 5.1 5.6 4.5 4.8 5.1 5.6 4.5 460 4.8 5.1 5.6 4.5 4.8 5.1 5.6 4.5 575 5.3 5.1 5.6 4.5 5.3 5.1 5.6 4.5 230 4.5 5.4 5.9 4.5 4.5 5.4 5.9 4.5 460 4.5 5.4 5.9 4.5 4.5 5.4 5.9 4.5 575 4.5 5.4 5.9 4.5 4.5 5.4 5.9 4.5
Evaporator Fan Performance Adjustment (Fig. 52−54)
Fan motor pulleys are factory set for speed shown in Appendix D.
To change fan speeds:
1. Shut off unit power supply.
2. Loosen nuts on the 4 carriage bolts in the mounting base. Using adjusting bolts and plate, slide motor and remove belt.
3. Loosen movable-pulley flange setscrew. (See Fig. 54.)
4. Screw movable flange toward fixed flange to increase speed and away from fixed flange to decrease speed. Increasing fan speed increases load on motor. Do not exceed maximum speed specified in Appendix D. See Appendix D for air quantity limits.
5. Set movable flange at nearest keyway of pulley hub and tighten setscrew. (See Appendix D for speed change for each full turn of pulley flange.)
6. Replace belts.
7. Realign fan and motor pulleys:
a. Loosen fan pulley setscrews.
b. Slide fan pulley along fan shaft.
c. Make angular alignment by loosening motor from
mounting plate.
8. Tighten belts.
9. Restore power to unit.
C06041
Fig. 54 − Evaporator−Fan Alignment and Adjustment
Evaporator Fan Belt Tension Adjustment
To adjust belt tension:
1. Turn off unit power.
2. Slide out fan deck to service position as shown in Evaporator Fan Service and Replacement section above.
3. Loosen motor mounting plate bolts.
4. Move motor mounting plate to adjust to proper belt tension. Motor adjuster bolts may be used to tighten belts. (See Fig. 52 or 53.) Do not overtighten belt. See Table 27 for 48/50PM16−28 size belt tension
5. Check for proper belt alignment. Adjust if necessary.
6. Tighten motor mounting plate bolts to lock motor in proper position.
7. Return fan deck back into operating position.
8. Restore power to unit.
86
Condenser-Fan Adjustment (Fig. 55)
T
1. Shut off unit power supply.
2. Remove condenser-fan assembly (grille, motor, motor cover, and fan) and loosen fan hub setscrews.
3. Adjust fan height as shown in Fig. 55.
4. Tighten setscrews and replace condenser-fan assembly.
5. Turn on power to unit.
C09292
Fig. 55 − Condenser−Fan Adjustment
NOVATION Heat Exchanger Condenser Service and Replacement
The condenser coil in this unit is a NOVATION heat exchanger surface. The NOVATION heat exchanger is an all−aluminum construction with fins over a single−depth crosstube. The crosstubes have multiple small passages through which the refrigerant passes from header to header on each end. (See Fig. 56.) The all−aluminum construction provides increased resistance to corrosion over aluminum fins on copper tubes in normal and mild marine applications.
!
CAUTION
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in damage to equipment.
Refer to product data manual for coil usage in coastal or industrial applications.
TUBES
FINS
MANIFOLD
a30-4457
Fig. 56 − NOVATION Heat Exchanger Coils
Repairing Tube Leaks
RCD offers service repair kits for repairing tube leaks in the crosstubes. These kits include approved braze materials and instructions specific to the aluminum NOVATION heat exchanger coil.
MICROCHANNELS
C07273
!
CAUTION
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in damage to equipment.
Use of other than approved repair procedures may affect the pressure rating or the corrosion resistance of the NOVATION heat exchanger condenser coil.
Replacing the NOVATION Heat Exchanger Coil
The service replacement coil is preformed and is equipped with transition joints with copper stub tubes. When brazing the connection joints to the unit tubing, use a wet cloth around the aluminum tube at the transition joint. Avoid applying torch flame directly onto the aluminum tubing.
Verify Sensor Performance
Verify that thermistor, transducer, and switch inputs are reading correctly. These values can be accessed through the Scrolling Marquee display in the Temperatures, Pressures, and Inputs menus. Some values will depend on configuration choices. Refer to the Control Set Up Checklist completed for the specific unit installation and to the configuration tables in Appendix A.
Economizer Operation During Power Failure
Dampers have a spring return. In event of power failure, dampers will return to fully closed position until power is restored. Do not
manually operate damper motor.
Evacuation
Proper evacuation of the system will remove noncondensables and ensure a tight, dry system before charging. Evacuate from both high and low side ports. Never use the system compressor as a vacuum pump. Refrigerant tubes and indoor coil should be evacuated to 500 microns. Always break a vacuum with dry nitrogen. The two possible methods are the deep vacuum method and the triple evacuation method.
Deep Vacuum Method
The deep vacuum method requires a vacuum pump capable of pulling a minimum vacuum of 500 microns and a vacuum gauge capable of accurately measuring this vacuum depth. The deep vacuum method is the most positive way of assuring a system is free of air and liquid water. (See Fig. 57.)
5000 4500 4000 3500
3000 2500
MICRONS
2000 1500
1000
500
0
2
1
MINUTES
4
3
Fig. 57 − Deep Vacuum Graph
LEAK IN SYSTEM
VACUUM TIGH TOO WET
TIGHT DRY SYSTEM
56
7
C06264
48/50PG and PM
87
Triple Evacuation Method
R410A
REFRIGERANTNT
OUTDOOR
FAN
MUSTBEBE
OPERATINGONON
HIGH
SPEED
20
40
60
80
100
120
140
160
150
200
250
300
350
400
450
500
550
600
Comp
ressor
Disch
arge
Pressu
re,[p[p
sig
Outdoor
Coil
eavin
Temp
eratu
re,
[Deg
rees
F]
Chargeifif
bove
the
Curve
Removeve
Chargeifif
Below
the
Curve
RANT
R F
N M
N H
H S
20
40
60
80
12
14
16
150
200
250
300
350
400
450
500
550
600
isc
sig
bov
the
Outdoor
Coil
eavin
Temp
eratu
re,
[Deg
rees
F]
The triple evacuation method should only be used when vacuum pump is capable of pumping down to 28−in. of mercury and system does not contain any liquid water. Proceed as follows:
1. Pump system down to 28−in. of mercury and allow pump to continue operating for an additional 15 minutes.
2. Close service valves and shut off vacuum pump.
3. Connect a nitrogen cylinder and regulator to system and open until system pressure is 2 psig.
4. Close service valve and allow system to stand for 1 hr. During this time, dry nitrogen will be able to diffuse throughout the system, absorbing moisture.
5. Repeat this procedure. System will then contain minimal amounts of contaminants and water vapor.
Refrigerant Charge
Amount of refrigerant charge is listed on unit nameplate. Refer to Carrier GTAC II; Module 5; Charging, Recovery, Recycling, and Reclamation section for charging methods and procedures. Unit panels must be in place when unit is operating during charging procedure.
Puron (R-410A) refrigerant systems should be charged with
48/50PG and PM
liquid refrigerant. Use a commercial type metering device in the manifold hose.
R410A
FAN
Above
Comp
MUST
the
300
ressor
REFRIGERA
OPERATING
Curve
Remo
350
Disch
arge
Pressu
Charge
400
160
140
F]
120
rees [Deg
re,
100
eratu
g Te m p
80
eavin
L Coil
60
Outdoor
40
20
150
OUTDOOR
AddddCharge
200
250
Fig. 58 − Charging Chart — 48/50PG03
HIGH
SPEED
Below
the
Curve
450
500
550
re,
sig
]
600
C07038
!
WARNING
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could cause personal injury, death and/or equipment damage.
OUTDOORF
16
0
14
0
R4R410A REREFRIRIGERANT
ANM
UST BE OPERATING ONH
IGHS
PEED
Puron (R−410A) refrigerant systems operate at higher pressures than standard R−22 systems. Do not use R−22 service equipment or components on Puron refrigerant equipment. Gauge set, hoses, and recovery system must be designed to handle Puron refrigerant. If unsure about equipment, consult the equipment manufacturer.
NOTE: Do not use recycled refrigerant as it may contain contaminants.
12
rees [Deg
re,
10100
eratu
g Te m p
Leavin Coil
Outdoor
80
60
Add Chahargegeif Abov
0
e the
Cururve
ReRemove Charge if BeBelow the Curve
F]
No Charge
Use standard evacuating techniques. After evacuating system, weigh in the specified amount of refrigerant (refer to unit nameplate).
NOTE: System charge for units with Humidi-MiZer system is greater than the system charge of the standard unit.
Low Charge Cooling
Using cooling charging chart (see Fig. 58−79), add or remove refrigerant until conditions of the chart are met. An accurate pressure gauge and temperature-sensing device is required. Charging is accomplished by ensuring the proper amount of liquid subcooling. Connect pressure gauge to the compressor discharge service valve. Connect temperature sensing device to the liquid line between the condenser and the TXV (thermostatic expansion valve), and insulate it so that ambient temperature does not affect reading.
To Use the Cooling Charging Chart, Standard Unit
NOTE: All circuits must be running in normal cooling mode.
Indoor airflow must be within specified air quantity limits for cooling. (See Appendix D.) All outdoor fans must be on and running at high speed. Use the Cooling Service Test Outdoor Fan Override function to start all outdoor fans.
Use the temperature and pressure readings, and find the intersection point on the cooling charging chart. If intersection point on chart is above line, add refrigerant. If intersection point on chart is below line, carefully recover some of the charge. Recheck suction pressure as charge is adjusted.
The TXV is set to maintain between 10 and 15 degrees of superheat at the compressors. The valves are factory set and cannot be adjusted. Do not use A TXV designed for use with R-22.
To Use the Cooling Charging Charts, Units With Humidi−Mizert Adaptive Dehumidification System
NOTE: All circuits must be running in normal cooling mode.
Indoor airflow must be within specified air quantity limits for cooling. (See Appendix D.) All outdoor fans must be on and running at high speed. Use the Cooling Service Test Outdoor Fan function (Service Test→COOL→OF.OV) to start all outdoor fans.
40
20
200
250
300
350
400
150
Compre ssssor Disc
ha rge P re ssssure , [psig
450
Fig. 59 − Charging Chart — 48/50PG04
500
550
]
600
C07039
88
If the outdoor temperature is low, the Motormaster outdoor fan
RANT
R F
N M
N H
H S
20
40
60
80
12
14
16
150
2002525
350
400
450
500
550
600
isc
sig
bov
the
ve
Outdoor
Coil
eavin
Temp
eratu
re,
[Deg
rees
F]
RANT
R F
N M
N H
H S
20
40
60
80
12
14
16
150
2002525
350
400
450
500
550
600
isc
sig
bov
the
ve
Outdoor
Coil
eavin
Temp
eratu
re,
[Deg
rees
F]
RANT
R F
N M
N H
H S
20
40
60
80
12
14
16
150
2002525
350
400
450
500
550
600
isc
sig
bov
the
ve
Outdoor
Coil
eavin
Temp
eratu
re,
[Deg
rees
F]
R
410A R R
GE R R A A
NT
AL L L O O
UTDO O O R R F F
ANS M M
US T T
BE
RUNNI
NG
20
40
60
80
10 0 0
12 0 0
14 0 0
16 0 0
100
150
20 0 0
250
300
35 0 0
400
450
500
550
600
ss o o r r D D
isc h h a a r r g g e e P P r r e e
ss u u r r e e , , [ [ p p
sig ] ]
dd C C
ha r r g g e e i i f f A A
bov e e
the C C
ur v v e e
ve
Ch
ar g g e e
if B B
e
lo w w t t h h e e
Cu r r
ve
Outdoor
Coil
L
eavin
g
Temp
eratu
re,
[Deg
rees
F]
control device may need to be temporarily bypassed by rewiring the power leads to obtain full speed.
R4R410A REREFRIRIGERANT
ANM
UST BE OPERATING ONH
e the
Cururve
RemoveveChChararge ififBelolow the CuCurve
IGHS
PEED
16
14
F]
12
rees [Deg
re, eratu
10100
g Te m p
Leavin Coil
Outdoor
80
60
0
0
AddddChaharge if Abov
0
OUTDOORF
16
14
F]
12
rees [Deg
re,
10100
eratu
g Te m p
Leavin Coil
Outdoor
0
0
0
80
60
40
OUTDOORF
ANM
AddddChaharge if Abov
R4R410A REREFRIRIGERANT
UST BE OPERATING ONH
e the
Cururve
RemoveveChChararge ififBelolow the CuCurve
IGHS
PEED
40
20
200
150
0 30000350
Compre ssssor Disc
400
ha rge Pressssure , [psig
Fig. 60 − Charging Chart — 48/50PG05
R4R410A REREFRIRIGERANT
ANM
UST BE OPERATING ONH
e the
Cururve
RemoveveChChararge ififBelolow the CuCurve
0 30000350
Compre ssssor Disc
400
ha rge Pressssure , [psig
16
14
F]
12
rees [Deg
re, eratu
10100
g Te m p
Leavin Coil
Outdoor
80
60
40
20
0
0
AddddChaharge if Abov
0
150
OUTDOORF
200
20
200
150
450
500
550
]
600
0 30000350
Compre ssssor Disc
400
ha rge P re ssssure , [psig
450
500
550
]
600
C07042
48/50PG and PM
Fig. 62 − Charging Chart — 48/50PG07
C07040
R
E E F F R R I I GE
410A
AL
UTDO
ANS
IGHS
PEED
16
14
F]
12
A A dd
ha
bov
the
rees [Deg
re,
10
eratu
Temp g
eavin
80
L Coil
60
Outdoor
ur
R R e e m m o o ve
40
20
100
150
20
250
450
500
550
]
600
C C o o m m p p r r e e ss
300
isc
NT
US
BE
RUNNI
NG
Ch
ar
if
lo
Cu
ve
e
35
400
450
500
550
ss
sig
600
Fig. 61 − Charging Chart — 48/50PG06
C07041
C06265
Fig. 63 − Charging Chart — 48/50PG08 and 09
89
R
410A R R
GE R R A A
NT
AL L L O O
UTDO O O R R F F
ANS M M
US T T
BE
RUNNI
NG
20
40
60
80
10 0 0
12 0 0
14 0 0
16
16 0 0
100
150
20 0 0
250
300
35 0 0
400
450
500
550
600
ss o o r r D D
isc h h a a r r g g e e P P r r e e
ss u u r r e e , , [ [ p p
sig ] ]
dd C C
ha r r g g e e i i f f A A
bov e e
the C C
ur v v e e
ve
Ch
ar g g e e
if B B e e
lo w w t t h h e e
Cu r r
ve
Outdoor
Coil
L
eavin
g
Temp
eratu
re,
[Deg
rees
F]
R4
10 A A
REF
RI G G E E
RANT
UT
DO O O R R F F
ANS M M
US T T B B E E R R
UNNI
NG
20
40
60
80
10 0 0
12 0 0
14 0 0
16 0 0
100
150
20 0 0
250
300
35 0 0
400
450
500
550
600
ss o o r r D D
isc h h a a r r g g e e P P r r e e
ss u u r r e e , , [ [ p p
sig ] ]
dd C C
ha r r g g e e i i f f A A
bov e e
the C C
ur v v e e
ve
Ch
ar g g e e
if B B e e
lo w w t t h h e e
Cu r r
ve
Outdoor
Coil
L
eavin
g
Temp
eratu
re,
[Deg
rees
F]
14
F]
12
rees [Deg
re,
10
eratu
T emp g
80
eavin L
Coil
60
Outdoor
40
20
100
A A dd
150
ha
AL
20
C C o o m m p p r r e e ss
bov
250
R
410A
UTDO
the
ur
R R e e m m o o ve
300
isc
E E F F R R I I GE
ANS
Ch
35
US
ar
400
ss
NT
BE
if
RUNNI
lo
450
sig
NG
500
PM16 and 20
Cu
ve
C09294
Fig. 66 − Charging Chart − 48/50PM16 and 20
550
600
48/50PG and PM
Fig. 64 − Charging Chart — 48/50PG12
R4
10
REF
RI
ur
ANS
35
RANT
US
Ch
ar
if
400
ss
A A L L L L O O UT
ha
20
C C o o m m p p r r e e ss
DO
bov
250
the
300
R R e e m m o o ve
isc
16
14
A A dd
12
F] rees
10
[Deg re,
eratu
80
Temp g
eavin L
Coil
60
Outdoor
40
20
100
150
Fig. 65 − Charging Chart — 48/50PG14
UNNI
lo
450
sig
NG
500
C06266
Cu
ve
C08048
Fig. 67 − Charging Chart − 48/50PM24
550
600
C06267
C08049
Fig. 68 − Charging Chart − 48/50PM28
90
Be sure unit is in normal cooling mode by checking that the RH2 solenoid coil(s) and the CRC relay are deenergized (control outputs off). Adjust charge per the charging charts as described in the To Use The Cooling Charging Charts, Standard Unit section. Switch system to run in the dehumidification mode for 5 minutes. Dehumidification mode is when the RH2 solenoid coil(s) and the CRC relay are energized. Switch back to cooling mode to recheck pressures and temperatures on the charging chart and adjust charge if necessary. If charge adjustment is necessary, then repeat the steps in this paragraph until no charge adjustment is necessary. When no more charge adjustment is necessary after switching from Dehumidification mode back to Cooling mode, then charge adjustment procedure is complete. Remove jumper from the outdoor motor speed controller.
PuronR Refrigerant
Puron refrigerant operates at 50 to 70 percent higher pressures than R-22. Be sure that servicing equipment and replacement components are designed to operate with Puron refrigerant. Do not mix with components that have been used with other refrigerants. Puron refrigerant, as with other HFCs, is only compatible with POE oils.
Recovery cylinder service pressure rating must be 400 psig. Puron systems should be charged with liquid refrigerant. Use a commercial-type metering device in the manifold hose. Manifold sets should be 750 psig high-side and 200 psig low-side with 520 psig low-side retard. Use hoses with 750 psig service pressure rating. Leak detectors should be designed to detect HFC refrigerant.
Table 28 – Altitude Compensation*
48PG03−07
ELEVATION
(ft)
0‐1,999
2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000 11,000 12,000 13,000 14,000
ELEVATION
(ft)
0‐1,999
2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000 11,000 12,000 13,000 14,000
NATURAL GAS
ORIFICE†
45 52 47 52 47 53 47 53 48 53 48 53 48 53 49 54 49 54 50 54 51 54 51 55 52 55 52 56
48PG08−14
NATURAL GAS
ORIFICE†
43 50 44 51 44 51 44 51 45 51 45 52 47 52 47 52 47 53 48 53 49 53 50 54 50 54 51 55
PROPANE
ORIFICE†
PROPANE
ORIFICE†
48PG08−14
ELEVATION
(ft)
0‐1,999
2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000 11,000 12,000 13,000 14,000
*As the height above sea level increases, there is less oxygen per cubic foot of air.
Therefore, heat input rate should be reduced at higher altitudes. Includes a 4% input reduction per each 1000 ft. †Orifices available through your Carrier dealer.
NATURAL GAS
ORIFICE†
30 38 30 40 31 40 31 41 31 41 31 42 32 42 32 43 32 43 35 44 36 44 37 45 38 46 39 47
PROPANE
ORIFICE†
Gas Valve Adjustment (48PG and PM)
The gas valve opens and closes in response to the thermostat or limit control.
When power is supplied to valve terminals W2 (High Fire) and C1, the main valve opens to its preset position.
The regular factory setting is stamped on the valve body.
To adjust regulator:
1. Set unit at setting for no call for heat.
2. Turn main gas valve to OFF position.
3. Remove connection. Install a suitable pressure-measuring device.
4. Set main gas valve to ON position.
5. Set thermostat at setting to call for heat.
6. Remove screw cap covering regulator adjustment screw. (See Fig. 69.)
7. Turn adjustment screw clockwise to increase pressure or counterclockwise to decrease pressure. The setting is 3.50 in. wg on sizes 03-14 and 3.00 on size 16−28.
8. Once desired pressure is established, set unit setting for no call for heat, turn off main gas valve, remove pressure-measuring device, and replace screw cap.
2 LEADS, #18 WIRE 1/32 INSULATION, 600V. MAX., 105°C
INLET PRESSURE TAP (PLUGGED) 1/8 - 27 N.P.T. THDS.
Fig. 69 − Typical Gas Valve (20−28 Sizes Shown)
1
/8-in. pipe plug from manifold pressure tap
1
/8-in. pipe plug and
REGULATOR ADJUSTMENT SCREW (REMOVE COVER)
OUTLET PRESSURE TAP (PLUGGED) 1/8-27 N.P.T. THDS.
ON
OFF
D-1
W-1
PILOT
ADJ.
RECEPTACLE TERMINAL
W-2
D-2
C1
C2
RECEPTACLE AND TAB COMBINATION TERMINAL
PILOT CONNECTION FOR 1/4” O.D. TUBING (PLUGGED)
C07262
48/50PG and PM
91
Table 29 – Altitude Compensation* − 48PM16−20
NATURAL GAS
ELEVATION
(ft)
0‐1,999
2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000
*As the height above sea level increases, there is less oxygen per cubic foot of air. Therefore, heat input rate should be reduced at higher altitudes. Includes a 4% input reduction per each 1000 ft.
†Orifices available through the local Carrier dealer.
Low Heat (D,L) Medium Heat (E,M) High Heat (F,N)
29 30 29 29 30 29 30 31 30 30 31 30 30 31 30 30 31 30 31 32 31 31 32 31 31 32 31 32 33 32
NATURAL GAS ORIFICE SIZE†
PROPANE GAS
48/50PG and PM
*As the height above sea level increases, there is less oxygen per cubic foot of air. Therefore, heat input rate should be reduced at higher altitudes. Includes a 4% input reduction per each 1000 ft.
†Orifices available through the local Carrier dealer.
High Altitude (48PG and PM)
For high altitude applications greater than 2,000 ft the heat input rate should be reduced. The higher the altitude is above sea level, the less oxygen is in the air. See Table 28 for orifice sizing. A high altitude kit is available to convert unit for altitudes up to 7,000 ft.
Main Burners (48PG and 48PM)
For all applications, main burners are factory set and should require no adjustment.
Main Burner Removal
1. Shut off (field-supplied) manual main gas valve.
2. Shut off power to unit.
3. Open gas section access door.
4. Disconnect gas piping from gas valve inlet.
5. Remove wires from gas valve.
6. Remove wires from rollout switch.
7. Remove sensor wire and ignitor cable from IGC board.
8. Remove 2 screws that hold the burner assembly to vestibule plate. For 48PM16−28 units, also remove the 2 screws se­curing the manifold bracket to the basepan.
9. Rotate the burner/manifold assembly to the right, away from the flue extension and lift burner/manifold assembly out of unit.
ELEVATION
(ft)
0‐1,999
2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000
PROPANE GAS ORIFICE SIZE†
Low Heat (D,L) Medium Heat (E,M) High Heat (F,N)
35 38 35 36 39 36 36 39 36 37 40 37 37 40 37 38 41 38 39 42 39 40 43 40 41 44 41 42 45 42
Cleaning and Adjustment
1. Remove burner rack from unit as described in Main Burner Removal section above.
2. Inspect burners, and if dirty, remove burners from rack. The two outer burners have the flame crossover closed off in order to prevent gas flow from exiting the sides of the burner assembly. To prevent ignition problems, make sure the outer burners are returned to their original position when done servicing.
3. Using a soft brush, clean burners and crossover port as required.
4. Adjust spark gap. (See Fig. 70.)
5. Reinstall burners on rack.
6. Reinstall burner rack as described above.
92
E
E
SPARK GAP
0.181” [4.6]
SECTION
C-C
AA
C
C
SECTION
A-A
SCALE 1:1
B
Fig. 70 − Spark Gap Adjustment
Filter Drier
Replace whenever refrigerant system is exposed to atmosphere. Only use factory specified liquid-line filter driers with working pressures no less than 650 psig. Do not install a suction-line filter drier in liquid line. A liquid-line filter drier designed for use with Puron refrigerant is required on every unit.
Protective Devices
Compressor Rotation
Overcurrent
Each compressor has internal line break motor protection.
Overtemperature
High−Pressure Switch
If the high-pressure switch trips, the compressor will shut down and the current sensor (3-phase units only) will not detect current. See the Current Sensor section below for more information.
Current Sensor (CS) (3−Phase Units Only)
The purpose of the CS is to detect losses in compressor power. After detecting a loss in compressor power, unit control locks out the compressor for 15 minutes. After 15 minutes, the alarm will automatically reset. If this alarm occurs 3 times consecutively, the compressor will remain locked out until an alarm reset is initiated via CCN or manually via the Scrolling Marquee display (see Alarms and Alerts section for more details).
Evaporator Fan Motor Protection
Indoor-fan motors less than 5 hp are equipped with internal overcurrent and overtemperature protection. Protection devices reset automatically. Disconnect and lock out power when servicing motor. Indoor-fan motors 5 hp and larger are equipped with a manual reset, calibrated trip, magnetic circuit breaker and overcurrent protection. Do not bypass connections or increase the size of the breaker to correct trouble. Determine the cause and correct it before resetting the breaker.
25.4
MAX. TYP .
B
SECTION
E-E
SCALE 2:1
SECTION
SCALE 1:1
D
D
B-B
SPARK GAP
0.120 TO 0.140” [3.05 TO 3.56]
SECTION
D-D
C06269
Condenser−Fan Motor Protection
Each condenser-fan motor is internally protected against overtemperature.
Fuses are located in the control box and feed power to the condenser fan motors. Always replace blown fuses with the correct size fuse as indicated on the unit fuse label.
Saturated Suction Pressure (SSP)
If the SSP for a particular circuit is reading below the alarm set point for an extended period of time, that circuit will be shut down. After 15 minutes, the alarm will automatically reset. If this alarm occurs 3 times consecutively, the circuit will remain locked out until an alarm reset is initiated via CCN or manually via the Scrolling Marquee display (see Alarms and Alerts section for more details).
Relief Devices
All units have relief devices to protect against damage from excessive pressures (i.e., fire). These devices protect the high and low side and are located at the suction line service port. Protect joint during brazing operations near joint.
Control Circuit, 24−V
Each control circuit is protected against overcurrent by a circuit breaker. Breaker can be reset. If it trips, determine cause of trouble before resetting.
Replacement Parts
A complete list of replacement parts may be obtained from any Carrier distributor upon request.
Diagnostic LEDs
The MBB, ECB, and IGC control boards have LED lights for diagnostic purposes. The meanings and error codes can be found in the troubleshooting section of this manual.
EnergyX
For units equipped with the EnergyX factory installed option, there will be an EnergyXv2 Supplement Installation Instructions in the unit’s information packet. Refer to this supplement for details on service and Maintenance.
93
48/50PG and PM
ITEM EXPANSION RANGE UNITS CCN TABLE/
RUN STATUS STATUS DISPLAY
VIEW Auto View of Run Status (VIEW = Display only)
HVAC HVAC Mode Status 1=Disabled
OCC Currently Occupied No/Yes OCCUPIED SAT Suppy Air Temperature xxx..x °F SAT_DISP ALRM Current Alarms & Alerts xx ALRMALRT TIME Time of Day xx.xx hh.mm TIMECOPY
VERS Software Version Numbers VERSIONS
MBB CESR131320xxxx (xxxx in table) MODEL_NUMBER_01 ECB CESR131249xxxx MODEL_NUMBER_02 MARQ CESR131171xxxx MODEL_NUMBER_03
MODE Control Modes MODEDISP
SYS Current System Mode 1=Disabled
HVAC Current HVAC Mode 1=Disabled
HV.DN Remote HVAC Mode Disable No/Yes HVACDOWN forcible
48/50PG and PM
EFF.C Cool Setpoint In Effect xx.x °F CSP_EFF EFF.H Heat Setpoint In Effect xx.x °F HSP_EFF OCC Currently Occupied No/Yes OCCUPIED forcible forcible T.OVR Timed Override in Effect No/Yes MODETOVR LINK Linkage Active No/Yes MODELINK D.LMT Demand Limit In Effect No/Yes MODEDMDL C.LOC Compressor OAT Lockout No/Yes COMPLOCK H.LOC Heat OAT Lockout No/Yes HEATLOCK OK.EC OK to Use Economizer? No/Yes ECONCOOL
COOL Cooling Status COOLDISP
DMD.C Cooling Demand xxx.x ^F COOL_DMD AVL.C Available Cooling Stages x AVLCSTGS REQ.C Requested Cooling Stages x REQCSTGS MAX.C Max Allowed Cool Stages x MAXCSTGS forcible LMT.C Max Cool Stage In Effect x CSTGLIMT IDF Indoor Fan State Off/On IDFSTATE F.SPD Commanded Fan Speed xxx % FANSPEED OFC.1 Outdoor Fan 1 Relay Off/On OFC_1 OFC.2 Outdoor Fan 2 Relay Off/On OFC_2 OFC.3 Outdoor Fan 3 Relay Off/On OFC_3 CRC Cool>Reheat1 Control Off/On CRC CIR.A Refrigerant Circuit A CIRCUIT A
CIR.B Refrigerant Circuit B CIRCUIT B
CIR.C Refrigerant Circuit C CIRCUIT C
APPENDIX A — LOCAL DISPLAY AND CCN TABLES
MODE — RUN STATUS
SUBTABLE
2=Ventilation 3=Cool 4=Heat
2=Run Enabled 3=Service Test
2=Ventilation 3=Cool 4=Heat
CMP.A Circuit A Compressor(s) Off/On COMP_A TG.A Timeguard A xxx sec TIMGD_A RH2.A Reheat2 Valve A Off/On RH2_A SST.A Sat. Suction Temp A xxx.x °F SST_A SSP.A Suction Pressure A xxx.x psig SSP_A SCT.A Sat. Condenser Temp A xxx.x °F SCT_A SCP.A Condenser Pressure A xxx.x psig SCP_A
CMP.B Circuit B Compressor Off/On COMP_B TG.B Timeguard B xxx sec TIMGD_B RH2.B Reheat2 Valve B,C Off/On RH2_B SST.B Sat. Suction Temp B xxx.x °F SST_B SSP.B Suction Pressure B xxx.x psig SSP_B SCT.B Sat. Condenser Temp B xxx.x °F SCT_B SCP.B Condenser Pressure B xxx.x psig SCP_B
CMP.C Circuit C Compressor Off/On COMP_C TG.C Timeguard C xxx sec TIMGD_C RH2.C Reheat2 Valve B,C Off/On RH2_B SST.C Sat. Suction Temp C xxx.x °F SST_C SSP.C Suction Pressure C xxx.x psig SSP_C SCT.C Sat. Condenser Temp C xxx.x °F SCT_C SCP.C Condenser Pressure C xxx.x psig SCP_C
HVACMODE
SYS_MODE
HVACMODE
CCN POINT CCN
WRITE
STATUS
MENU WRITE
STATUS
94
APPENDIX A — LOCAL DISPLAY AND CCN TABLES (CONT)
MODE — RUN STATUS (cont)
ITEM EXPANSION RANGE UNITS CCN TABLE/
HEAT Heating Status HEATDISP
DMD.H Heating Demand xxx.x ^F HEAT_DMD AVL.H Available Heating Stages x AVLHSTGS REQ.H Requested Heating Stages x REQHSTGS MAX.H Max Allowed Heat Stages x MAXHSTGS forcible LMT.H Max Heat Stage In Effect x HSTGLIMT IDF Indoor Fan State Off/On IDFSTATE F.SPD Commanded Fan Speed xxx % FANSPEED HT.1 Heat Stage 1 Relay Off/On HEAT_1 TG.H1 Heat Stage 1 Timeguard xxx sec TIMGD_H1 HT.2 Heat Stage 2 Relay Off/On HEAT_2 TG.H2 Heat Stage 2 Timeguard xxx sec TIMGD_H2
ECON Economizer Status ECONDISP
EC.CP Econo Commanded Position xxx % ECONOCMD EC.AP Econo Actual Position xxx % ECONOPOS EC.MP Min Position in Effect xxx % MIN_POS forcible IAQ.S IAQ Level (switch) Low/High IAQIN IAQ IAQ Level (sensor) xxxx IAQ OAT Outdoor Air Temperature xxx.x °F OA_TEMP ENTH Outdoor Enthalpy Switch Low/High ENTHALPY OAQ OAQ Level (sensor) xxxx OAQ PE.1 Power Exhaust 1 Relay Off/On PE_1 PE.2 Power Exhaust 2 Relay Off/On PE_2
OAU Outside Air Unit Status OAUDISP
OA.RN OAU System Run State 1=AUTO
OA.OP OAU Operating Mode 0=Off
UPC UPC Software Version xxxx UPC_VER OAU OA Unit Software Version xxxx OAU_VER 2P.DM OAU 2position Damper Close/Open OAUDMPR WHL OAU Wheel Speed xxx % OAUWHEEL LAT OAU Leaving Air Temp xxx.x °F OAU_LAT EXAT OAU Exhaust Air Temp xxx.x °F OAU_EXAT OA.MN Minimum Outside Air CFM xxxxx CFM MINOACFM DCV.M Min DCV Outside Air CFM xxxxx CFM MINDCVSP OA.FS OAU OA Fan Speed xxx % OAFANSPD A.OA Actual Outside Air CFM xxxxx CFM ACTOACFM C.OA Command Outside Air CFM xxxxx CFM CMDOACFM PE.OF Power Exhaust CFM Offset xxxxx CFM EXOFFSET EX.FS OAU Exhaust Fan Speed xxx % OAUPESPD A.EX Actual Exhaust Air CFM xxxxx CFM ACTEXCFM C.EX Command Exhaust Air CFM xxxxx CFM CMDEXCFM BP.SP Building Pressure Setpnt x.xx in H2O OAU_BPSP BP Building Pressure x.xx in H2O OAU_BP TM.LO OA Tempring Lockout Temp xx °F OATMPLOC TM.SP OA Tempring SAT Setpoint xx °F OATMPSPT OA.HT OAU Tempering Heater xxx % OAHEATER
HRS Component Run Hours STRTHOUR
A1 Compressor A1 Run Hours xxxxx.xx hours HR_A1 forcible A2 Compressor A2 Run Hours xxxxx.xx hours HR_A2 forcible B1 Compressor B1 Run Hours xxxxx.xx hours HR_B1 forcible C1 Compressor C1 Run Hours xxxxx.xx hours HR_C1 forcible CCH Crankcase Heat Run Hours xxxxx.xx hours HR_CCH forcible IDF Indoor Fan Run Hours xxxxx.xx hours HR_IDF forcible OFC.1 Outdoor Fan 1 Run Hours xxxxx.xx hours HR_OFC_1 forcible OFC.2 Outdoor Fan 2 Run Hours xxxxx.xx hours HR_OFC_2 forcible OFC.3 Outdoor Fan 3 Run Hours xxxxx.xx hours HR_OFC_3 forcible HT.1 Heat Stage 1 Run Hours xxxxx.xx hours HR_HTR_1 forcible HT.2 Heat Stage 2 Run Hours xxxxx.xx hours HR_HTR_2 forcible PE.1 Power Exhaust1 Run Hours xxxxx.xx hours HR_PE_1 forcible PE.2 Power Exhaust2 Run Hours xxxxx.xx hours HR_PE_2 forcible ALRM Alarm Relay Run Hours xxxxx.xx hours HR_ALM forcible CRC Reheat1 Valve Run Hours xxxxx.xx hours HR_CRC forcible RH2.A Reheat2 Valve A Run Hrs xxxxx.xx hours HR_RH2_A forcible RH2.B Reheat2 Valve BC Run Hrs xxxxx.xx hours HR_RH2_B forcible
2=OFF 3=TEST
1=ERV (DCV) 2=Free Cooling 3=OA Tempering 4=Defrost 5=Test 6=Ext. Mode 1 7=Ext. Mode 2 8=Ext. Mode 3
OAU_RUN
OAU_MODE
SUBTABLE
CCN POINT CCN
WRITE
STATUS
MENU WRITE
STATUS
48/50PG and PM
95
ITEM EXPANSION RANGE UNITS CCN TABLE/
STRT Component Starts
A1 Compressor A1 Starts xxxxxx ST_A1 forcible A2 Compressor A2 Starts xxxxxx ST_A2 forcible B1 Compressor B1 Starts xxxxxx ST_B1 forcible C1 Compressor C1 Starts xxxxxx ST_C1 forcible CCH Crankcase Heat Starts xxxxxx ST_CCH forcible IDF Indoor Fan Starts xxxxxx ST_IDF forcible OFC.1 Outdoor Fan 1 Starts xxxxxx ST_OFC_1 forcible OFC.2 Outdoor Fan 2 Starts xxxxxx ST_OFC_2 forcible OFC.3 Outdoor Fan 3 Starts xxxxxx ST_OFC_3 forcible HT.1 Heat Stage 1 Starts xxxxxx ST_HTR_1 forcible HT.2 Heat Stage 2 Starts xxxxxx ST_HTR_2 forcible PE.1 Power Exhaust 1 Starts xxxxxx ST_PE_1 forcible PE.2 Power Exhaust 2 Starts xxxxxx ST_PE_2 forcible ALRM Alarm Relay Starts xxxxxx ST_ALM forcible CRC Reheat1 Valve Starts xxxxxx ST_CRC forcible RH2.A Reheat2 Valve A Starts xxxxxx ST_RH2_A forcible RH2.B Reheat2 Valve BC Starts xxxxxx ST_RH2_B forcible
(ALRMDISP) =
CCN only)
48/50PG and PM
Active Alarm 1 Code xxx ALMCODE1 Active Alarm 2 Code xxx ALMCODE2 Active Alarm 3 Code xxx ALMCODE3 Active Alarm 4 Code xxx ALMCODE4 Active Alarm 5 Code xxx ALMCODE5 Reset All Current Alarms No/Yes ALRESET forcible Reset Alarm History No/Yes ALHISCLR forcible
(GENERIC =
CCN only)
up to 20 points (LON_DATA =
CCN only)
nviSpaceTemp xxx.x °F NVI_SPT Forcible nviSetPoint xxx.x °F NVI_SP forcible nvoSpaceTemp xxx.x °F NVO_SPT nvoUnitStatus.mode xxxx NVO_MODE nvoUnitStatus.heat_out_p xxx.x % NVO_HPRI nvoUnitStatus.heat_out_s xxx.x % NVO_HSEC nvoUnitStatus.cool_out xxx.x % NVO_COOL nvoUnitStatus.econ_out xxx.x % NVO_ECON nvoUnitStatus.fan_out xxx % NVO_FAN nvoUnitStatus.in_alarm xxx NVO_ALRM nviSetPtOffset xxx.x ^F NVI_SPTO forcible nviOutsideTemp xxx.x °F NVI_OAT forcible nviOutsideRH xxxx.x % NVI_OARH forcible nvoEffectSetPt xxx.x °F NVO_EFSP nvoOutsideTemp xxxx.x °F NVO_OAT nvoOutsideRH xxx.x % NVO_OARH nviSpaceRH xxx.x % NVI_SPRH forcible nviCO2 xxxxx NVI_CO2 forcible nvoCO2 xxxxx NVO_CO2 nvoTEMP1 xxx.x °F NVO_SAT nvoTEMP2 xxx.x °F NVO_RAT nviPCT1 xxx.x % NVI_RHSP forcible nvoPCT1 xxx.x % NVO_SPRH nviDISCRETE1 Off/On NVI_FSD forcible nviDISCRETE2 No/Yes NVI_OCC forcible nviDISCRETE3 Off/On NVI_IAQD forcible nvoDISCRETE1 Off/On NVO_FSD nvoDISCRETE2 No/Yes NVO_OCC nvoDISCRETE3 Off/On NVO_IAQD nciCO2Limit xxxxx NCI_CO2 forcible nciSetPnts.occupied_cool xxx.x °F NCI_OCSP forcible nciSetPnts.standby_cool xxx.x °F NCI_SCSP forcible nciSetPnts.unoccupd_cool xxx.x °F NCI_UCSP forcible nciSetPnts.occupied_heat xxx.x °F NCI_OHSP forcible nciSetPnts.standby_heat xxx.x °F NCI_SHSP forcible nciSetPnts.unoccupd_heat xxx.x °F NCI_UHSP forcible
APPENDIX A — LOCAL DISPLAY AND CCN TABLES (CONT)
MODE — RUN STATUS (cont)
SUBTABLE
ALRMDISP
GENERIC
LON_DATA
CCN POINT CCN
WRITE
STATUS
MENU WRITE
STATUS
96
APPENDIX A — LOCAL DISPLAY AND CCN TABLES (CONT)
MODE — SERVICE TEST
ITEM EXPANSION RANGE UNITS DEFAULT
SERVICE TEST
TEST Field Service Test Mode Off/On Off (TEST = display only) MAN_CTRL forcible forcible INDP Test Independent Outputs TESTINDP
ECON Economizer Position Test 0 to 100 % 0 S_ECONO forcible forcible E.CAL Calibrate Economizer Off/On Off S_ECOCAL forcible forcible PE.1 Power Exhaust 1 Test Off/On Off S_PE_1 forcible forcible PE.2 Power Exhaust 2 Test Off/On Off S_PE_2 forcible forcible ALRM Alarm Relay Test Off/On Off S_ALMOUT forcible forcible CCH Crankcase Heat Test Off/On Off S_CCH forcible forcible OA.DM OAU 2position Damper Close/
WHL OAU Wheel Test 0 to 100 % 0 S_WHEEL forcible forcible OA.OF OAU OA Fan Speed Test 0 to100 % 0 S_OAFAN forcible forcible OA.XF OAU PE Fan Speed Test 0 to100 % 0 S_EXFAN forcible forcible OA.HT OAU Tempring Heater Test 0 to 100 % 0 S_OAHEAT forcible forcible
FANS Test Fans TESTFANS
IDF Indoor Fan Power Test Off/On Off S_IDF forcible forcible F.SPD Indoor Fan Speed Test 0 to 100 % 0 S_FANSPD forcible forcible OFC.1 Outdoor Fan 1 Test Off/On Off S_OFC_1 forcible forcible OFC.2 Outdoor Fan 2 Test Off/On Off S_OFC_2 forcible forcible OFC.3 Outdoor Fan 3 Test Off/On Off S_OFC_3 forcible forcible
COOL Test Cooling TESTCOOL
CMP.A Cool A Test Off/On Off S_COMP_A forcible forcible CMP.B Cool B Test Off/On Off S_COMP_B forcible forcible CMP.C Cool C Test Off/On Off S_COMP_C forcible forcible F.SPD Reduced Cool Fan Speed 60 to 100 % 0 S_FSPDCL forcible forcible OF.OV Outdoor Fan Override Off/On Off S_OFC_OV forcible forcible
HMZR Test Humidimizer TESTHMZR
RH1.A Reheat1 A Test Off/On Off S_RH1_A forcible forcible RH1.B Reheat1 B Test Off/On Off S_RH1_B forcible forcible RH1.C Reheat1 C Test Off/On Off S_RH1_C forcible forcible RH2.A Reheat2 A Test Off/On Off S2_RH2_A forcible forcible RH2.B Reheat2 B Test Off/On Off S2_RH2_B forcible forcible RH2.C Reheat2 C Test Off/On Off S2_RH2_C forcible forcible F.SPD Reheat2 Fan Speed 65 to 100 % 0 S_FSPDRH forcible forcible CRC Cool>Reheat1 Valve Test Off/On Off S_CRC forcible forcible RHV.A Reheat2 Valve A Test Off/On Off S_RH2_A forcible forcible RHV.B Reheat2 Valve B,C Test Off/On Off S_RH2_B forcible forcible
HEAT Test Heating TESTHEAT
HT.1 Heat Stage 1 Test Off/On Off S_HEAT_1 forcible forcible HT.2 Heat Stage 2 Test Off/On Off S_HEAT_2 forcible forcible F.SPD Reduced Heat Fan Speed 65 to 100 % 0 S_FSPDHT forcible forcible
Open
Close S_OADMPR forcible forcible
CCN TABLE/ SUB-TABLE
MAINTENANCE DISPLAY
CCN POINT
CCN
WRITE
STATUS
DISPLAY
WRITE
STATUS
48/50PG and PM
MODE — TEMPERATURES
ITEM EXPANSION RANGE UNITS
STATUS DISPLAY
TEMPERATURES UINPUT
AIR.T Air Temperatures
SAT Supply Air Temperature xxx.x dF SAT_DISP OAT Outdoor Air Temperature xxx.x dF OA_TEMP forcible forcible SPT Space Temperature xxx.x dF SPACE_T forcible forcible SPTO Space Temperature Offset xxx.x dF SPTO forcible forcible RAT Return Air Temperature xxx.x dF RETURN_T forcible
REF.T Refrigerant Temperatures
SST.A Sat. Suction Temp A xxx.x dF SST_A SCT.A Sat. Condenser Temp A xxx.x dF SCT_A SST.B Sat. Suction Temp B xxx.x dF SST_B SCT.B Sat. Condenser Temp B xxx.x dF SCT_B SST.C Sat. Suction Temp C xxx.x dF SST_C SCT.C Sat. Condenser Temp C xxx.x dF SCT_C
CCN TABLE/ SUB-TABLE
CCN POINT
CCN
WRITE
STATUS
DISPLAY
WRITE
STATUS
MODE — PRESSURES
ITEM EXPANSION RANGE UNITS CCN TABLE/SUB-TABLE CCN POINT
STATUS DISPLAY
PRESSURES UINPUT
SSP.A Suction Pressure A xxx.x psig SSP_A SCP.A Condenser Pressure A xxx.x psig SCP_A SSP.B Suction Pressure B xxx.x psig SSP_B SCP.B Condenser Pressure B xxx.x psig SCP_B SSP.C Suction Pressure C xxx.x psig SSP_C SCP.C Condenser Pressure C xxx.x psig SCP_C
CCN WRITE
STATUS
97
ITEM EXPANSION RANGE UNITS DEFAULT
SETPOINT CONFIGURATION SETPOINTS SET_PNT
OCSP Occupied Cool Setpoint 55 to 80 °F 78 OCSP UCSP Unoccupied Cool Setpoint 65 to 95 °F 85 UCSP OHSP Occupied Heat Setpoint 55 to 80 °F 68 OHSP UHSP Unoccupied Heat Setpoint 40 to 80 °F 60 UHSP GAP HeatCool Setpoint Gap 2 to 10 ^F 5 HCSP_GAP STO.R SPT Offset Range (+/) 0 to 5 ^F 5 SPTO_RNG RH.SP Space RH Occupied SP 30 to 100 % 50 SPRH_SP RH.UN Space RH Unoccupied SP 30 to 100 % 50 SPRH_USP RH.DB Space RH Deadband 2 to 20 % 8 SPRH_DB RH.HB Reheat Heat SP Deadband 5 to 5 ^F 2 RH_HSPDB CA.LO Circuit A Lockout Temp 0 to 100 °F 0 OATLCMPA CB.LO Circuit B Lockout Temp 0 to 100 °F 0: no HumidiMiZer FIOP
CC.LO Circuit C Lockout Temp 0 to 100 °F 0 OATLCMPC HT.LO Heating Lockout Temp 40 to 125 °F 75 OATLHEAT EH.LO Econo Cool Hi Temp Limit 40 to 100 °F 65 OATLECLH EL.LO Econo Cool Lo Temp Limit  30 to 50 °F 0 OATLECLL FC.LO Free Cool Low Temp Limit  30 to 70 °F 50 OATLUEFC LCSP Low Cool SAT Setpoint 55 to 75 °F 55 (0307)
48/50PG and PM
HCSP High Cool SAT Setpoint 50 to 70 °F 55 HCSASP
ITEM EXPANSION RANGE UNITS
INPUTS UINPUT
STAT Thermostat Inputs
Y1 Thermostat Y1 Input On/Off Y1 forcible Y2 Thermostat Y2 Input On/Off Y2 forcible W1 Thermostat W1 Input On/Off W1 forcible W2 Thermostat W2 Input On/Off W2 forcible G Thermostat G Input On/Off G forcible
GEN.I General Inputs
FIL.S Filter Status Switch Dirty/Clean FILTSTAT forcible FAN.S Fan Status Switch On/Off FAN_STAT forcible FDWN Fire Shutdown Switch On/Off FIREDOWN forcible ENTH Outdoor Enthalpy Switch High/Low ENTHALPY forcible RM.OC Remote Occupancy Switch On/Off REM_OCC forcible HUM Space Humidity Switch High/Low HUM_STAT forcible
CS.IN Current Sensor Inputs
CS.A1 Compressor A1 Feedback On/Off CS_A1 CS.A2 Compressor A2 Feedback On/Off CS_A2 CS.B1 Compressor B1 Feedback On/Off CS_B1 CS.C1 Compressor C1 Feedback On/Off CS_C1
AIR.Q Air Quality Inputs
IAQ.S IAQ Level (switch) High/Low IAQIN forcible forcible IAQ IAQ Level (sensor) xxxx ppm IAQ forcible forcible OAQ OAQ Level (sensor) xxxx ppm OAQ forcible forcible SP.RH Space Humidity Sensor xxx.x % SPRH forcible forcible
APPENDIX A — LOCAL DISPLAY AND CCN TABLES (CONT)
MODE — SET POINTS
CCN TABLE/
SUB-TABLE
HumidiMiZer FIOP: 40 (PG0816) 0 (2028, PM16)(0307)
65 (0828)
OATLCMPB
LCSASP
MODE — INPUTS
CCN TABLE/
SUB-TABLE
STATUS DISPLAY
CCN POINT
CCN
WRITE
STATUS
CCN POINT
DISPLAY
WRITE
STATUS
98
APPENDIX A — LOCAL DISPLAY AND CCN TABLES (CONT)
MODE — OUTPUTS
ITEM EXPANSION RANGE UNITS
STATUS DISPLAY
OUTPUTS UOUTPUT
FANS Fan Outputs
IDF Indoor Fan State On/Off IDFSTATE F.SPD Commanded Fan Speed xxx FANSPEED OFC.1 Outdoor Fan 1 Relay On/Off OFC_1 OFC.2 Outdoor Fan 2 Relay On/Off OFC_2 OFC.3 Outdoor Fan 3 Relay On/Off OFC_3
COOL Cool Outputs
CMP.A Circuit A Compressor(s) On/Off COMP_A CMP.B Compressors B On/Off COMP_B CMP.C Compressors C On/Off COMP_C CCH Crankcase Heat Relay On/Off CCH CRC Cool>Reheat1 Control On/Off CRC RH2.A Reheat2 Valve A On/Off RH2_A RH2.B Reheat2 Valve BC On/Off RH2_B
HEAT Heat Outputs
HT.1 Heat Stage 1 Relay On/Off HEAT_1 HT.2 Heat Stage 2 Relay On/Off HEAT_2
ECON Economizer Outputs
EC.CP Econo Commanded Position 0 to 100 % ECONOCMD forcible forcible EC.AP Econo Actual Position 0 to 100 % ECONOPOS PE.1 Power Exhaust 1 Relay On/Off PE_1 forcible PE.2 Power Exhaust 2 Relay On/Off PE_2 forcible
ALRM Alarm Relay On/Off ALMOUT forcible
CCN TABLE/ SUB-TABLE
CCN POINT
CCN
WRITE
STATUS
DISPLAY
WRITE
STATUS
48/50PG and PM
99
CONFIGURATION
DISP Display Configuration DISPLAY 14
METR Metric Display Off/On Off DISPUNIT 14 LANG Language Selection 0=English
PROT Password Enable Disable/Enable Enable PASS_EBL 14 PSWD Service Password 0000 to 9999 1111 PASSWORD 14 TEST Test Display LEDs Off/On Off (display
UNIT Unit Configuration UNIT 14
S.DLY Startup Delay 10 to 600 sec 30 STARTDLY 14 U.CTL Unit Control Type 2=Thermostat
T.CTL Thermostat Control Type 0=Adaptive
OC.FN Fan On When Occupied No/Yes Yes OCC_FAN 15 IDF.F Shut Down on IDF Failure No/Yes Ye s FATALFAN 15 FN.SW Fan Status Switch 0=No Switch
48/50PG and PM
FL.SW Filter Status Switch 0=No Switch
FS.SW Fire Shutdown Switch 0=No Switch
RM.SW Remote Occupancy
SAT.T SAT Settling Time 10 to 900 sec 240 SAT_SET 15 RAT.S RAT Sensor on SPTO In
RH.S RH Sensor on OAQ Input No/Yes No RH_OAQ 15 RH.SW Space Humidity Switch 0=No Switch
TCS.C Temp Cmp Strt Cool
TCS.H Temp Cmp Strt Heat
APPENDIX A — LOCAL DISPLAY AND CCN TABLES (CONT)
MODE — CONFIGURATION
ITEM EXPANSION RANGE UNITS DEFAULT
0 LANGUAGE 14
2 CTL_TYPE 14
0 STATTYPE 15
0: no FIOP
0: no FIOP
0: no FIOP
0 REMOCCFG 15
0: no HumidiMiZer
1: FIOP
1: FIOP
1: FIOP
FIOP 1: HumidiMiZer FIOP
Switch
put
Factr
Factr
1=Spanish 2=French 3=Portuguese
3=Space Sensor
1=1 Stage Y1 2=2 Stage Y1 3=Digital
1=Normal Open 2=Normal Closed
1=Normal Open 2=Normal Closed
1=Normal Open 2=Normal Closed 0=No Switch 1=Normal Open 2=Normal Closed
No/Yes No RAT_SPTO 15
1=Normal Open 2=Normal Closed 0 to 60 mins 0 TCSTCOOL 15
0 to 60 mins 0 TCSTHEAT 15
CCN TABLE/
SUB-TABLE
SERVICE CONFIGURATION
only, not in table)
FANSTCFG 15
FILSTCFG 15
SHTDNCFG 15
HUMSTCFG 15
CCN POINT PAGE NO.
14
DISPTEST 14
100
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