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48-50PM C16-28
User Manual
188 pgs9.71 Mb0

Carrier 48-50PM C16-28, 48-50PG C03-14 User Manual

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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rv
ice
T
em
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res
s
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in
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per
ating
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4
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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.
C08057
48/50PM16−28
sensor may be mounted in the return or directly in the
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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
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