Carrier 48/50FC 04-07, 48/50GC 04-06 User Manual

48/50FC 04--- 07, 48/50GC 04--- 06 Single Package Rooftop Units with SystemVu™ Controls Version 1.X and Puronr (R---410A) R efrig er ant

Controls, Start-- Up, Operation

and Troubleshooti ng

IMPORTANT: This literature covers 48/50FC 04--07 and 48/50GC 04 --06 models with SystemVu controls version 1.X (factory--installed

option).

C150173

TABLE OF CONTENTS

Page

SAFETY CONSIDERATIONS 2.........................

GENERAL 3.........................................

Conventions Used in This Manual 3......................

BASIC CONTROL USAGE 3...........................

SystemVu Control (factory--installed option) 3..............

SystemVu Interface 3.................................

Accessory Navigatort Display 4........................

System Pilott andTouchPilott Devices 5................

CCN Tables and Display 5.............................

START--UP 6.........................................

Unit Preparation 6....................................

Refrigerant Service Ports 6.............................

Crankcase Heater 6...................................

Compressor Rotation 6................................

Power Supply 6.....................................

Internal Wiring 6.....................................

Evaporator Fan 6....................................

Condenser Fans and Motors 6...........................

Return--Air Filters 8..................................

Outdoor--Air Inlet Screens 8............................

Accessory Installation 8...............................

Gas Heat (48FC and 48GC) 8...........................

CONTROLS QUICK SET--UP 8.........................

Control Set Point and Confirmation Log 8.................

Initial Startup 8......................................

Thermostat Control 9.................................

Space Temperature Sensor Control -- Direct Wired

(T--55 or T--56 or T --59) 9.............................

Space Humidistat Control 9............................

Space Relative Humidity Sensor Control 9.................

CCN Communication 9...............................

CCN Linkage Control 9...............................

System Pilott -- Communication Space Sensor 9...........

Accessories 9.......................................

Programming Operating Schedules 10....................

SERVICE TEST 10....................................

Independent Outputs 10...............................

Fan Test 10.........................................

Cooling Test 11.....................................

Heating Test 11......................................

Automatic Test 11....................................

THIRD PARTY CONTROL 12..........................

Cooling/Heating Control 12............................

Dehumidification Control 12...........................

Remote Occupancy 12................................

Remote Shutdown 12.................................

Alarm Output 12.....................................

Economizer Damper Control 12.........................

CONTROLS OPERATION 12...........................

Display Configuration 12..............................

Unit Configuration 12.................................

General Operation 13.................................

Demand Determination 13.............................

Occupancy Determination 15...........................

Indoor Fan Operation 16...............................

Cooling Operation 16.................................

Optional Humidi--MiZer

Indoor Fan Based Dehumidification 21...................

Heating Operation 21.................................

Supply Air Tempering 22..............................

Two Position Damper Operation 22......................

Economizer Operation 22..............................

Power Exhaust 24....................................

Indoor Air Quality (IAQ) 25............................

Pre--occupancy Purge 26...............................

Temperature Compensated Start 26.......................

Linkage 26.........................................

Carrier Comfort Network

BACnet Network Operation 26.........................

Alarm Handling 27...................................

TROUBLESHOOTING 27..............................

Complete Unit Stoppage 27............................

Restart Procedure 27..................................

Faults and Alerts 27..................................

Control Module Communication 34......................

Communication Failures 34............................

Cooling Troubleshooting 35............................

Humidi--MiZer System Troubleshooting 36................

Economizer Troubleshooting 37.........................

Heating Troubleshooting 38............................

Phase Protection 41..................................

Thermistor Troubleshooting 41.........................

Sensor Trim 41......................................

Transducer Troubleshooting 41.........................

Dehumidification System 17......

(CCN) Operation 26............

MAJOR SYSTEM COMPONENTS 46....................

General 46.........................................

Main Base Board (MBB) 54............................

Integrated Gas Control (IGC) Board 56...................

Protective Devices 57.................................

Space Mounted Sensors 57.............................

Carrier Comfort Network

APPENDIX A: SystemVut Controller Display 61...........

APPENDIX B: SystemVu Controller Text Point Reference 83...

APPENDIX C: Navigatort Display 84....................

APPENDIX D: SystemVu Controller CCN Tables 95..........

APPENDIX E: BACnet Points List 119....................

CONTROL SET POINT AND CONFIGURATION L OG 132...

UNIT S TART--UP CHECKLIST 143......................

(CCN) Interface 59.............

SAFETY CONSIDERATIONS

Installation and servicing of air-conditioning equipment can be hazardous due to system pressure and electrical components. Only trained and qualified service personnel should install, repair, or service air-conditioning equipment. Untrained personnel can perform the basic maintenance functions of replacing filters. Trained service personnel should perform all other operations.

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. W ear safety glasses and work gloves. Use quenchi ng cloth for unbrazing operations. Have fire exti ngui shers availa ble 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.

Understa nd the signal words DANGER, WARNING, and CAUTION. These words are used with the safet y--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 resul t 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.

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 48/50FC and 48/50GC rooftop units equipped with the factory--installed optional SystemVut controls (version 1.X or higher) and use Puronr (R--410A) refrigerant. The specific base unit installation instructions, service manual 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 units in Table 1 are Staged Air Volume (SAVt) units that allow for stand--alone or network operation.

Table 1 – Rooftop Units

MODEL SIZE NOMINAL TONS

04 3

48/50FC

48/50GC

Conventions Used in This Manual

The following conventions for discussing configuration points for the local display (SystemVu controller or Navigatort accessory) will be used in this manual.

Menu paths will be written with the main menu name first, then any menus or sub menus, each separated by an arrow symbol () and will also be shown in bold and italics. As an example, the General sub menu which is located in the Setting main menu under Unit Configuration menu would be written as SETTINGS

UNIT CONFIGURATIONSGENERAL.

05 4 06 5 07 6 04 3 05 4 06 5

This path name will show the user how to navigate through the local display to reach the desired menu. The user scrolls through the Menus 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.

Point names are referenced in in parentheses and bold and italics as would be shown on the local display.

CCN point names are also referenced for users configuring the unit with C C N software instead of the lo cal display. S ee Appendix A at the end of this manual.

BASIC CONTROL USAGE

SystemVu Control (factory-- installed option)

The SystemVu control is a comprehensive unit-management system. The control system is easy to access, configure, diagnose and troubleshoot.

The SystemVu control system is fully communicating and cable-ready for connection to the Carrier Comfort Network (CCN), Carrier i--Vu, and Third Party BACnet* building management systems. The control provides high-speed communications for remote monitoring via the Internet. Multiple units can be linked together (and to other Direct Digital Control (DDC) equipped units) using a 3-wire communication bus.

The SystemVu control system is easy to access through the use of a integrated display module. A computer is not required for start-up. Access to control menus is simplified by the ability to quickly select from 7 main menu items. An expanded readout provides detailed explanations of control information. Only six buttons are required to maneuver through the entire controls menu. The display readout is designed to be visible even in bright sunlight.

System u

RUN ALERT FAULT

TESTTEST

SystemVu Interface

This integrated device is the keypad interface used to access the control information, read sensor values, and test the unit. The interface is located in the main control box and is standard on all units. The interface is a 6 --key, 4x30 character, LCD (liquid--crystal display) display module. The interface also contains Status LEDs. (See Fig. 1.) The interface is easy to operate using 6 buttons and themainmenustructuresshowninFig.2.

Through the SystemVu interface, the user can access all of the inputs and outputs to check on their values and status, configure operating parameters, and evaluate the current decision status for operating modes. The control also includes an alarm history which can be accessed from the display. The user can access a built--in test routine that can be used at start--up commissioning and troubleshooting.

* BACnet is a registered trademark of ASHRAE (American Society of

Heating, Refrigerating and Air --- Conditioning Engineers).

BACK ENTER MENU

C14319

Fig. 1 -- SystemVu Interface



Fig. 2 -- SystemVut -- Main Menu Structures

SystemVu Interface Operation

Units are shipped from the factory with the SystemVu interface FIOP, located in the main control box. (See Fig. 1.) In addition, the interface has up and down arrow keys, BACK, ENTER, MENU, and TEST keys. These keys are used to navigate through the different levels of the menu structure. All discussions and examples in this document will be based on the SystemVu display except in the Navigatort display section. See the Accessory Navigator Display section for further details and Table 2 for the Navigator menu structure and usage.

The six keys are used to navigate through the display structure, which is organized in a tiered menu structure. If the buttons have not been used for a period, the display will default to a standby screen intended to provide a quick overall look at the system. To show the top--level display, press any key first to turn the display backlight on, and then press the MENU key. Then use the up and down arrow keys to scroll through the top --level menus. These are showninFig.2andlistedinAppendixA.

When a specific menu or sub--menu is located, push the ENTER key to enter the menu. Depending on the menu, there may be additional tiers. Continue to use the up and down keys and the ENTER key until the desired display item is found. At any time, the user can move back a menu level by pressing the BACK 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). Pressing the TEST button at any time will jump the display to the test menu. Pressing the MENU button any time will jump the display to the main menu.

Items in the Configuration and Service Test menus are password protected. The display will prompt the enter password screen when required. Use the ENTER, BACK, and arrow keys to enter the four digits of the password. The default user password is 1111.

Pressing the BACK and ENTER keys simultaneously will show an expanded text description screen on the display indicating the full meaning of each display point. To put the screen in standby, hold down the BACK key for 5 seconds.

Some points can be force d from the System Vut interface. To force a variable, follow the same process as editing a configuration parameter. A forced variable, regardless where the force has come from will be displayed with a lower case “f” following its value. For example, if ECON CMD POSITION is forced, the display shows “80%f”, where the “f” is to signify a force on the point. Remove the force by selecting the point that is forced with the key ENTER and then pressing the up and down arrow keys simultaneously. Pressing ENTER and BACK on a forced item will display the expanded description for that item including the force level that is currently applied. Depending on the type of unit (48FC,GC or 50FC,GC), factory--installed options and field--installed accessories, some of the items in the various menus may not apply.

a48--- 10366

Accessory Navigatort Display

The accessory hand-held Navigator display can be used with the 48/50FG, GC units. (See Fig. 3.) The Navigator display is plugged into the LEN (local equipment network) port on either the SystemVu display or the Main Base Board (MBB).

Navigator Display Operation

The Navigator display has 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 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 C and will be indicated on the Navigator display by the LED next to each mode listed on the face of the display.

n Sta

ice

era

res

ure

tpo

utp

uts

fig

tion

e C

ating

Mod

Fig. 3 -- Accessory Navigator Display

When a specif i c mode or sub-mode is located, push the ENTER key to enter the mode. Dependi ng on the mode, there may be additional tier s. Continue to use the up and down keys and the ENTER keys until the desire d 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.

Ala

Sta

tus

ture

C06321

RUN

STAT US

Auto View of

Run Status

(VIEW)



Cooling

Status

(COOL)



Heating

Status

(HEAT)



Vent ilat ion

Status

(VENT)



Assigned I/O

Channels

(A.IO)



Vers io ns

(VERS)

SERVICE

TEST

Service T est

Mode

(TEST)



T es t Independent

Outputs

(INDP)



Te s t F a n s

(FANS)



Test Cooling

(COOL)



Te s t H e at i n g

(HEAT)

Table 2 – Navigator Mode and Menu Display Structure

TEMPERATURES PRESSURES

SET-

POINTS

INPUTS OUTPUTS CONFIGURATION TIMECLOCK

Thermostat

Inputs

(STAT)



Switch

Inputs

(SW)



Analog

Inputs

(AIS)



General

Inputs

(GEN)

General Outputs

(GEN)



Cooling Outputs (COOL)



Heating Outputs

(HEAT)

General Unit

Config

(GEN)



Indoor Fan

Config (I.FAN)



Economizer

Config

(ECON)



Building Net

Config (NET)



User Display

Config

(DISP)

Time o f Da y

(TIME)



Month, Date

Day and Year

(DATE)



Daylight Savings

Config

(DST)



Schedules

Adjust

(SCHD)



Holiday

Adjustment

(HLDY)

OPERATING

MODES

ALARMS

Curr Active

Alarm

(CURR)



History

(HIST)



Reset All

Current

Alarms

(R.CUR )



Alarm Reset

History (R.HIS)

Pressing the ESC and ENTER keys simultaneously will display 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 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 Navigator display. 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 “f” on a Navigator display following its value. For example, if economizer commanded position (EC.CP) is forced, the Navigatort display shows “80f”, where the “f” is blinking to signify a force on the point. Remove the force by selecting the point that is forced with the key ENTER and then pressing the up and down arrow keys simultaneously.

Depending on the type of unit (48FC,GC or 50FC,GC), factory-installed options and field-installed accessories, some of the items in the various Mode categories may not apply.

See Table 2 and Appendix C for full Navigator display menu layout.

System Pilott and Touch Pilott 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 SystemVut display and Navigator display, 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 3Vt zoning system, linkage compatible air source, universal controller, and all other devices operating o n the Carrier communicating network.

Additionally, the System Pilot device can serve as a wall-mounted temperature sensor for space temperature measurement. Occupants can use the System Pilot device to change set points. See Fig. 4 for System Pilot device details.

CCN Tables and Display

In addition to the unit--mounted SystemVut 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 SystemVu display menus may be different and more items may be displayed in the CCN tables. Details on the CCN tables are included in Appendix D.

NAVIGATE/ EXIT

SCROLL

PAGE

Fig. 4 -- System Pilott User Interface

Force Hierarchy

There is a hierarchy in SystemVu controls 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 SystemVu controller uses a Control Force at level 7. The Navigatort device writes a Service Force which is level 3. System Pilott and Touch Pilott devices write Supervisor Forces at level 4. Network programs can be set to write different level priority forces.

NOTE: In the case of a control power reset, any force in effect at the time of power reset will be cleared.

IMPORTANT: All further discussions and examples in this document will be based on the SystemVut controller.

MODIFY SELECT

C06322

START-UP

IMPORTANT: Do not attempt to start unit, even momentarily,

until all items on the Start--Up Checklist (see page 143) 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.

Refrigerant Service Ports

The 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.

Crankca se Heater

The compressor is equipped with a crankcase heater. There is a control function used to turn the crankcas e heaters on and off whe n the compre ssor is not running. This is a configurable value for which the factory default value is set to 65_F . If the ambie nt is above the select ed value the control will preve nt the crankca se heater from turning on.

IMPORTANT: Unit power must be on for 24 hours prior to start--up to allow the crankcase heater to run. Otherwise, damage to the compressor may result.

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 importa nt to be cert ain the compre ssors are rotating in the proper dire ction. To deter mine whether or not compre ssors are rotati ng in the proper direct ion, use a phase-rot ation mete r 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 compre ssor is rotati ng in the wrong direction, the controls will stop the compressor and display alarm for “Circ ui t A Reverse Rotati on”.

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 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

The Evaporator fan does not need to be checked for rotation as it only operates in one direction. Refer to the unit product data for full Fan Performance tables and physical data. The specific unit’s fan performance table is printed and adhered to the control box high voltage cover. See Fig. 5 for an example fan performance table.

Use the job specifications and unit fan performance table to determine the operating mode specific fan speeds. The following instructions are included in the unit i nstallation instructions. When adjusting the Heating Fan Speed and High Cooling Fan Speed, ensure that the CFM is not lower than the minimum CFM allowed in the product data.

1. Check the job specifications for the CFM (cubic feet per minute) and ESP (external static pressure) required.

2. Using the chart on the Fan Speed Set Up labels (see Fig. 5), calculate the RPM from the CFM and ESP for the base unit plus any field accessories (as listed on the label).

NOTE: The Fan Speed Set Up labels are located on the High Voltage cover in the Control Box.

3. Press any key on the SystemVu interface to activate the display backlight and then press the MENU key.

4. Using the UP and DOWN arrow keys highlight SETTINGS and then press ENTER.

5. Use the DOWN arrow key highlight the UNIT CONFIGURATIONS menu then press ENTER.

6. Highlight UNIT CONFIGURATIONS then press ENTER.

7. Highlight INDOOR FAN and then press ENTER.

8. Refer to the job specifications to set the following, determining the values per the RPM Calculator label (Figure 5). Use the UP and DOWN arrow keys and the BACK key to set the values. Press ENTER after setting each value to continue to the next selection.

S IDF VENT SPD

S IDF HEAT SPD S IDF LOW COOL SPD

S IDF HIGH SPD S IDF FREE COOL SPD

Service test mode can also be used to temporarily operate the Evaporator Fan with a percentage (0-- 100%) command. The fan test menu will show the converted RPM from the percentage being commanded. Refer to the Service test section for more details.

Adjust the IDF Maximum Fan Speed (IDF MAX SPEED) to restrict higher fan speeds as needed for sensitive applications.

IMPORTANT: The IDF Maximum Fan Speed (IDF MAX SPEED) RPM must not produce a supply CFM that is lower than the minimum CFM allowed in the product data for heating and cooling. The IDF Maximum Fan Speed (IDF MAX SPEED) must also be grea ter than or equal to the highest operating mode speed setting.

Condenser Fans and Motors

Condenser fans and motors are factory set.

RPM

Calculator

1500 1625 1750 1875 2000

CFM

2125 2250

UNIT MODEL NUMBER

Field Accessories:

1 Stage E Heat 2 Stage E Heat

2375 2500

Economizer

0.2

1301 1381 1463 1548 1633 1720 1808 1897 1987

66 80

107

ESP in. wg

0.4

1477 1544 1615 1688 1764 1842 1921 2003 2068

66 80 80 80 80 80 80 80

107 107 107 107 107 107 107

Fig. 5 -- Example of Fan Speed Set Up Labels

0.6

1639 1699 1763 1828 1897 1967 2040 2115 2191

0.8

1788 1843 1902 1962 2025 2090 2157 2227 2298

1.0

1925 1976 2031 2087 2146 2208 2271 2336

1.2

2054 2101 2152 2206 2262 2320 2380

1.4

2174 2220 2268 2318 2372

66 66

1.6 1.8 2.0

2289 2332 2378

a50--- 10219

INDOOR

BLOWER ACCESS PAN EL

CONTROL BOX AND GAS SECTION ACCESS PANEL

Fig. 6 -- Panel and Filter Locations

FILTER ACCESS PANEL

INDOOR COIL ACCESS PANEL

UNIT BACKUNIT FRONT

a48--- 9937

Return--Air Filters

Check that correct filters are installed in filter tracks (see Physical Data table in unit Product Data). Do not operate unit without return-air filters. Determine the filter change run time (DIRTY FILTER TIME) to be set in the quick setup configurations menu.

Outdoor--Air Inlet Screens

Outdoor-air inlet screens must be in place before operating unit.

Accessory Installation

Check to make sure that all accessories including space thermostats and sensors have been installed and wired as required by the instructions and unit wiring diagrams.

Gas Heat (48FC a nd 48GC)

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. Close the field-supplied manual gas shut off valve, located external to the unit.

2. Connect a pr essure gauge to the supply gas pressure tap, located on the fie ld-supplied manual gas shut off valve (see Fig. 7).

MANUAL GAS SHUT OFF VALVE

(FIELD SUPPLIED)

GAS

SUPPL

SUPPLY GAS PRESSURE TAP (1/8˝ NPT PLUG)

UNIT

UNION

Fig. 7 -- Field Gas Piping

SEDIMENT TRAP

a48--- 9382

3. Connect a pressure gauge to the manifold pressure tap on the burner assembly located inside the unit.

4. Open the field-supplied manual gas shut off valve. Enter Service Test mode by setting TEST MODE to “ON” using the SystemVut controller interface. Use the Service Test feature to set HEAT 1 TEST to ON (first stage of heat) using the SystemVu controller interface.

5. After the unit has run for several minutes, verify the supply gas pressure is adequate per the base unit installation instructions. If not, adjust accordingly.

NOTE: Supply gas pressure must not exceed 13.0--in. wg.

6. Set HEAT 1 TEST to OFF using the SystemVu controller interface.

7. Exit Service Test mode by setting TEST MODE to “OFF” using the SystemVu controller interface.

CONTROLS QUICK SET--UP

The following information will provide a quick guide to setting up and configuring the 48/50FC and 48/50GC series units with System Vu controls. Unit controls are pre-configured at the fac t ory for factory-installed options. Field-installed accessories will require configuration at start-up. Initial System Startup is recommended for initial start--up. Additionally, specific job requirements may require changes to default configuration values. See Appendix A and other sections of the se instructions for more details. Refer t o the Major System Components or accessory installation instructions for specific wiring detail.

Control Set Point and Configuration Log

During start up, accessory installation, and equipment service set points and/or configuration changes might have to be made. When setting set points or configuration settings, documentation is recommend. The Control Set Point and Configuration Log starting on page 132 should be filled out and left with the unit at all times, a copy should also be provided to the equipment owner. A USB jump drive can be used to back up the unit’s configurations. Refer to the USB Operation section for details.

Initial Startup

Initial Startup refers to the first time this particular unit has a startup performed. The SystemVu controller will continually display the Initial Startup prompt until it is completed. To complete the initial startup you must complete the Quick Setup, Network Setup, and the System Auto Test.

Quick Setup

This a list of common adjusted configurations set during startup. These are common accessories, and control means. Set the list in Table 3. After setting these per the specific unit set the QUICK SET CHKLIST point to done.

Table 3 – Quick Setup Menu Items

SystemVu™ Display Expanded Name Range Default

QUICK SETUP CONFIG QUICK SETUP

TIME Clock Hour and Minute HH:MM

DATE Current Date MM/DD/YYYY

STARTUP DELAY Unit Startup Delay 10 to 600 30

UNIT CONTR OL TYPE Unit Control Type 0=TSTAT,

THERMOSTAT TYPE Thermostat Hardware

DIRTY FILTER TIME Change Filter Timer 0to9999 600

HEATINGSTAGQTY Number of Heating

VENT METHOD V entilation Method 0=NONE

FREECOOL MAX OAT Free Cooling Max OAT 0to90 65

FIRE SHUTDOWN SW Fire Shutdown S wi tch 0=No Switch,

QUICK SET CHKLIST QUICK SETUP

* These defaults change based on the Unit model number.

CONFIG MENU

Type

Stages

CHECKLIST

1=SPACE SEN, 2=RAT SEN

0=CONV 2C2H, 1=DIGI 2C2H, 2=CONV 3C2H, 3=DIGI 3C2H

1to2 2*

1=ECON 2=2POS DMPR 3=ERV 4=ECON ERV

1=N/Open 2=N/Close

0=Undone, 1=View, 2=Done

Network Setup

This is a shortcut to the Network Settings submenu. In this sub menu are the specific network settings required to get the network piece up and running. After setting these per the specific unit set the NETWORK CHKLIST point to done.

System Auto Test

Turning this to Start will run enable test mode and execute the System Auto Test. After the auto test has completed, set this to done.

Thermostat Control

Wire accessory thermostat to the corresponding R, Y1, Y2, W1, W2, and G terminals on the Main Base board.

The Unit Control Type configuration, (UNIT CONTROL TYPE) default value is for thermostat (0) so there is no need to configure this item.

The Thermostat Hardware Type, (THERMOSTAT TYPE) selects the unit response to the thermostat inputs above.

NOTE: May not be compatible with heat anticipator thermostats.

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 Space Mounted Sensors section (page 57) for additional information.

The Unit Control Type configuration, (UNIT CONTROL TYPE) must be set to Space Sensor (1).

Space Humidistat Control

For units with factory installed Humidi--MiZerRsystem option, the humidistat input is defaulted for use on the Y3 thermostat input screw terminal as a normally open switch. This can be changed with the Humidistat Switch Channel configuration (HUMSTAT

CHANNEL) and the Humidistat switch type configuration (HUMSTAT SW TYPE).

Space Relative Humidity Sensor Control

For units with factory installed Humidi--MiZer system option, a Relative Humidity (RH) sensor input can be used in addition to or in place of the Humidistat switch. This can be done by wiring into one of the configurable analog inputs and setting the Space Relative Humidity sensor channel (SPRH SENSOR CHAN) to the input channel selected. The most field accessible input channel is AI06 located at TB5--5 on the MBB (Main Base board).

CCN Communication

First configure the building protocol SETTINGS  NETWORK SETTINGS  BAS PROTOCOL to CCN (default is 0 = NONE). Configure the following under the CCN menu (SETTINGS  NETWORK SETTINGS  CCN).

CCN ELEMENT # -- D e f a u l t i s 1 BUS NUMBER -- D e f a u l t i s 0 CCN BAUDRATE -- Default is 2 = 38400

CCN Linkage Control

The CCN communication must be properly configured for the units and all other devices. Linkage configuration is automatically done by the supervisory CCN Linkage device.

The unit control type configuration, (UNIT CONTROL TYPE) must be set to space sensor (1).

The factory location of the SAT sensor will read accurately for heating and cooling for proper operation with linkage applications, therefore the SAT heating mode sensing configuration (SAT DURING HEAT?) is enabled from the factory. If a more accurate SAT reading is need, the sensor can be re--located into the duct and no configuration adjustment needed.

System Pilott -- Communication Space Sensor

Install the System Pilot device and connect the CCN communication bus from it to the unit’s CCN connect ion on TB4 -- BAS connect or of the Main Ba s e Boa rd (MBB). Configure the unit’s CCN communic ation 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.

Accessories

Below are quick configuration settings for field--installed accessories. When factory--installed as options the points will already be configured. See the Space Mounted Sensors section (page 57), third party control, control connection tables, and CCN or Display parameter tables for any accessories not mentioned below and refer to installation manual of the accessory.

Economizer

When an economizer is field-- installed, the unit must be configured for it by setting SETTINGSUNIT CONFIGURATIONS  ECONOMIZER  VENT METHOD to ECON. 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

When power exhaust is field-- installed, the unit must be configu red for it by setting SETTINGSUNIT

CONFIGURATIONSECONOMIZER  POWER EXHAUST CONFIGS  PE1 RELAY CHANNEL to the channel the

accessory was wired into. 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

When electric heat is field--installed, the number of electric heat stages must be configured by setting SETTINGS  UNIT

CONFIGURATI ONS  HEATING  HEATING STAGE QTY

per the installed heater.

Fire Shutdown

When Fire Shutdown or Smoke Detector sensors are field--installed, the unit must be configured for it by setting

SETTINGS  UNIT CONFIGURATIONS  SWITCH INPUTS CONFIGS  FIRE SHUTDOWN SW to normally open (0) or

normally closed (1).

Outdoor Enthalpy

When an Outdoor Enthalpy sensor is field--installed, the unit must be configured for it by setting SETTINGS  UNIT

CONFIGURATI ONS  ANALOG INPUTS CONFIGS  OARH SENSOR CHAN to the channel number the sensor was wired into.

IAQ Sensor

When a CO2sensor is field--installed, the unit must be configu red for it by setting SETTINGS  UNIT

CONFIGURATIONS  ANALOG INPUT CONFIGS  IAQ SENSOR CHAN selects the unit response to this input. Default

conversion to 0 to 2000 ppm.

OAQ Sensor

When an Outdoor Air Quality sensor is field--installed, the unit must be configured for it by setting SETTINGS  UNIT

CONFIGURATIONS  ANALOG INPUT CONFIGS  OAQ SENSOR CHAN. Default conversion to 0 to 2000 ppm.

Filter Status

When a Filter Status Switch is field--installed, the unit must be configured by setting the input channel it is wired to and normal state.

SETTINGSUNIT CONFIGURATIONSSWITCH INPUT CONFIGS FILTER SW CHANNEL and FILTER SW TYPE.

Phase Monitor

When a phase monitor is field--installed, the unit must be configured by setting the input channel it is wired to and normal state SETTINGUNIT CONFIGURATIONSSWITCH INPUTS

CONFIGSPHASE MON CHANNEL and PHASE MON SW TYPE.

Two Position Damper

When a Two Position damper is field--installed, the unit must be configured by setting the output channel it is wired to.

SETTINGS  UNIT CONFIGURATI ON  GENERAL  2POS/ ERV CHANNEL.

Programming Operating Schedules

When the building automation system you have the SystemVut controller configured for (BAS Protocol Select) is None (0) or CCN (1) the SystemVu controller can follow a standard CCN occupancy table. The occupancy can be modified from any CCN tool or from the local display.

OCCUPANCY SCHEDULE — For flexibility of scheduling, the occupancy programming is broken into eight separate periods. For each period the schedule contains the following fields: Day of Week, Occupied From, and Occupied To.

DAY OF WEEK — The day of week configuration consists of eight fields corresponding to the seven days of the week and a holiday field in the following order: Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday, and Holiday. If a 1 is configured in the corresponding place for a certain day of the week, the related “Occupied from” and “Occupied to” times for that period will take effect on that day of the week. If a 1 is placed in the holiday field, the related times will take effect on a day configured as a holiday. A zero means the schedule period will not apply to that day.

Day of week: Range 0 or 1 Default Values 0 for all of the periods.

OCCUPIED FROM — This field is used to configure the hour and minute, in 24 hour clock, that the mode for the controller will switchtooccupied.

Occupied From: Units Hours:Minutes Range 00:00 to 24:00 (Minutes 00 to 59) Default Value 00:00

OCCUPIED TO — This field is used to configure the hour and minute, in 24 hour clock, that the mode for the controller switches from occupied to unoccupied.

Occupied To: Units Hours:Minutes Range 00:00 to 24:00 (Minutes 00 to 59) Default Value 00:00

When the building automation system configured to (BAS PROTOCOL) is BACnet, the occupancy and holiday information will be reset to defaults in preparation for receiving a BACnet occupancy object. While participating on a BACnet network these configurations cannot be changed at the local interface or with CCN tools. All scheduling is done from the BACnet interface designated to provide schedules.

SERVICE TEST

The Service Tes t function can be used to verify proper operation of compre ssors, heating sta ges, indoor f an, outdoor fa ns , Humidi--MiZer 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 deta i ls)

Service T est mode has the following changes from normal opera t ion:

S Outdoor air temperature limits for cooling circuits, economizer,

and heating are ignored.

S Normal compressor time guards and other staging delays are

reduced to one minute or less.

S Circuit stri ke out time is reduced to 1 minute instead of 15 minutes . S It may take up to 30 seconds to actually enter test mode after

activating the command.

Press the TEST button on the SystemVut interface anytime to access the Test menu. Service Test mode 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 mode on, change the value of TEST MODE to ON. To turn service test mode off, change the value of TEST MODE to OFF. Service Test mode will be automatically turned off based on keypad inactivity and the Service Mode Test Time out (TEST MODE TIMEOUT).

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 INDEPENDENTS submenu is used to change output status for the economizer, Humidi-- MiZer system valves, power exhaust stages, crankcase heaters, the alarm relay, as well as perform a compressor bump test. These independent outputs can operate simultaneously with other Service Test modes. All outputs return to normal operation when Service Test is turned off. The compressor bump tests cannot be run while running cooling tests and will automatically turn off after one minute.

Fan Test

The FA N T E S T S submenu is used to setup or test speeds for the indoor fan. Use the IDF SPEED TEST point to control the indoor fan speed in terms of %, and use the CONVERTED IDF RPM point as feedback to help set the fan speed settings in terms of RPM. The indoor fan transition type point inform the test routine how to handle the fans while running the cooling or heating tests. Automatic will automatically transition the fans as the cooling or heating tests change. While the Manual transition will only run the fans as set by the test points.

system operation, power exhaust fans, economizer,

Cooling Test

The COOL submenu is used to change output status for the individual compressors and Humidi--MiZer system operation. The HEAT submenu service test outputs are reset to OFF for the cooling service test. Indoor fans and outdoor fans are controlled normally to maintain proper unit operation when set for automatic transition. The IDF SPEED TEST and ALL ODFSPD TEST can be changed as needed for testing. These fans points show the requested speed not actual speed. All normal cooling faults and alerts are functional.

Heating Test

The HEAT submenu is used to change output status for the individual heat stages, gas or electric. The COOL service test outputs are reset to OFF for the heating service test. Indoor fan is controlled normally to maintain proper unit operation when set for automatic transition. The IDF S PEED TEST can be changed as needed for testing and shows the requested speed not actual speed. All normal heating faults and alerts are functional.

NOTE: When the IGC fan on command (IGC FAN REQUEST) is active the fan may run when not expected.

Table 4 – Test Mode Unit Test Directory

Display Menu/Sub menu/Name Expanded Name Values

UNIT TESTS Unit Tests Menu

TEST MODE ServiceTestModeEnable Off/On

SERVICE TEST Service Test Menu

INDEPENDENTS INDEPENDENT TEST MENU

ECON POS TEST Economizer Position Test 0 to 100

BUMP COMP A1 TEST Compressor Bump A1 Test Off/On

RH DIS VALVE TEST Rht Dischg Valve Rly Tst Off/On

RH LIQ VALVE TEST Reheat Liq Valv Rly Test Off/On

CL LIQ VALVE TEST Cooling Liq Valv Test Off/On

CCH RELAY 1 TEST Crankcase Heater 1 test Off/On

ALARM RELAY TEST Alarm Output Relay Test Off/On

PE1 RELAY TEST Power Exhaust 1 Test Off/On

PE2 RELAY TEST Power Exhaust 2 Test Off/On

2POS/ERV RLY TEST 2Position/ERV Relay Test Off/On

FAN TE STS Indoor and Outdoor Fan tests

IDF SPEED TEST Indoor Fan Speed Test 0 to 100

CONVERTED IDF RPM Converted IDF Speed XXXX

IDF MANUAL TRANS IDF Manual Transition Yes/ No

COOL Cooling Status Menu

COOL A1 TEST Cooling W/Comp.A1 Test Off/On

CIR A LOADER TEST Cooling W/Comp.ALD Test Off/On

IDF SPEED TEST Indoor Fan Speed Test 0 to 100

ODF RELAY TEST ODF Speed Relay Test Off/On

HUMIDIMIZER TEST Humidimizer Level Test 0=Off

HEAT Heating Status Menu

HEAT 1 TEST Heating Stage 1 Test Off/On

HEAT 2 TEST Heating Stage 2 Test Off/On

IDF SPEED TEST Indoor Fan Speed Test 0 to 100

AUTOMATIC TEST Automatic Test Menu

AUTO INDP TEST AUTO INDEPENDENT TEST Ye s/ N o

AUTO COOL TEST RUN AUTO COOLING TEST Ye s/N o

AUTO HEAT TEST RUN AUTO HEATING TEST Yes /N o

AUTO SYSTEM TEST RUN AUTO SYSTEM TEST Yes/N o

1 = SUBCOOL 2=REHEAT

Automatic Test

The AUTOMATIC TEST sub m en u is used to ex ecu te all the applicable tests to the sy stem au to m atically. Th ese in clu d e independent components, cooling, heating, and system. Table 5 shows the steps taken during the independent, cooling, and heating auto m atic tests. The Hold time rep resen ts the time at which that control waits before moving on to the next step.

The AUTO SYSTEM TEST will execute the independent auto test, then the cooling auto test, then the heating auto test. At the end of the system auto test a prompt will ask if you want to enter measured data and complete a service report.

Table 5 – Independent, Cooling, and Heating Automatic Tests

AUTO INDP TEST

Step Action Hold (Sec)

1 Turn on Crankcase Heater Relay 0

2 Set IDF speed to 100% 30

3 Turn on 2 position damper/ERV relay 30

4 Set Economizer Damper to 100% 60

5 Turn o n p o w e r e x h a u s t 1 10

6 Turn o n p o w e r e x h a u s t 2 10

7 SetEconomizerDamperto0% 60

8 Turn off power exhau st 2 10

9 Turn off power exhau st 1 10

10 Set IDF to the ventilation speed 30

11 Turn off 2 position damper/ERV relay 0

12 Turn on alarm relay 10

13 Turn off alarm relay 10

14 Set IDF to 0% speed 30

15 Turn off Crankcase Heater relay 0

AUTO COOL TEST

Step Action Hold (Sec)

1 Set IDF auto transition 0

2 Turn o n C o o l A1 te s t 60

3 Turn on Compressor Loader test 30

4 Turn o f f OD F R e l a y t e st 10

5 Turn off Compressor Loader test 60

6 Turn off Cool A1 test 30

7 Turn on Hot Gas Reheat Test 60

8 Switch to Subcooling Test 30

9 Turn off Subcooling Test 30

AUTO HEAT TEST

Step Action Hold (Sec)

1 Set IDF auto transition 0

2 Turn o n H e a t 1 te s t 60

3 Turn o n H e a t 2 te s t 60

4 TurnoffHeat1andHeat2tests 20

THIRD PARTY CONTROL

Third party controls may interface with the unit SystemVut controller 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 TB1 of the board. The Unit Control Type configuration, UNIT CONTROL TYPE, must be 0 (Tstat) to recognize the below inputs. Terminal R is the 24--VAC source for the following:

Y1 = first stage cooling Y2 = second stage cooling W1 = first stage heating

W2 = second stage heating G = Indoor fan

Dehumidification Control

CHANNEL) and the Humidistat switch type configuration (HUMSTAT SW TYPE).

Remote Occupancy

The remote occupancy input can be provided on one of the configurable inputs, most commonly TB3. The Remote Occupancy Switch configuration, REMOTE OCC TYPE, identifies the normally open or normally closed status of this input when unoccupied. The Remote Occupancy Channel configuration, REMOTE OCC CHAN, identifies the discrete input (DI) assigned for this function.

Remote Shutdown

The remote shutdown input is provided for unit shutdown in response to switch input configured most commonly on TB3. The Remote Shutdown Swi t ch configuration, REM. SHUTDOWN TYPE, identifies the normally open or normally closed status of this input when there is no shutdown command. The Remote Shutdown Channel configur ation, REM. SHUTDOWN CHAN, identifies the discrete input (DI) assi gned for this function.

Alarm Output

The alarm output is provided on as a configurable relay, most commonly on TB2, to indicate when a current alarm is active. The output will be 24 --VAC if a current alarm exists. The Alarm Relay Channel configuration, ALM RELY CHANNEL, identifies the discrete output (DO) assigned for this function.

Economizer Damper Control

For units with the economizer option or accessory, the damper position can be directly controlled through the IAQ sensor input. The IAQ Analog Input configuration, IAQ LEVEL CONTROL will have to set to 2 (CTL MINP). When IA.CF = 2, an external 4 to 20 mA source is used to move the damper 0% to 100% directly.

CONTROLS OPERATION

Display Configuration

The SETTINGSDISPLAY SETTINGS submenu is used to configure the local display settings.

METRIC DISPLAY

This variable is used to change the display from English units to Metric units.

LANGUAGE

This variable is used to change the language of the SystemVu display. At this time, only English is available.

CONTRAST ADJUST

This is used to adjust the contrast of the SystemVu display.

PASSWORD ENABLE?

This variable enables or di sables the use of a user password. The passw ord is used to rest r ict use of the control to change configurations.

VIEW USER PASSWORD

This menu allows the user to view the user password. The password must be entered or disabled to view it.

CHANGE USER PASSWORD

This menu allows the user to change the user password. The password must be entered or disabled to change it.

Unit Configuration

Many configurations that indicate what factory options and/or field accessories are installed and other common operation variables are included in SETTINGSUNIT CONFIGURATION submenu. Some of these configurations will be set in the factory for the factory--installed options (FIOPs). Field installed accessories and custom control functions will require configuration changes. The SETTINGSUNIT CONFIGURATIONGENERAL submenu contains the following control configurations. Refer to other specific sections for other configurations.

STARTUP DELAY

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

This configuration defines if temperature control is based on thermostat inputs or space temperature sensor input. TSTAT value is when then 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. SPACE SEN value is when the unit determines cooling and heating demand based on the space temperature and the appropriate set point. RAT SEN value is when the unit determines cooling and heating demand based on the return air temperature and the appropriate set point. SPACE SEN or RAT SEN are also used as Linkage configuration.

THERMOSTAT TYPE

This configuration applies only if Unit Control Type is Thermostat. The value determines how the inputs are interpreted. See the specific operation sections for more information. The following descriptions define what each value means.

0 = CONV 2C2H – Conventional Thermostat 2 stage cool and

2 stage heat.

1 = DIGI 2C2H – Digita l Thermos t at 2 stage cool and 2 stage heat. 2 = CONV 3C2H – Conventional Thermostat 3 stage cool and

2 stage heat. This is the default setting.

3 = DIGI 3C2H – Digital Thermostat 3 stage cool and 2 stage heat.

ADAPTIVE TSTAT

This configuration applies only if the Unit control type is Thermostat. When this is YES the control will use Adaptive Control for cooling and heating staging. When this is set to NO the control will use the Traditional Thermostat Control, however during integrated cooling Adaptive is always used.

DIRTY FILTER TIME

This configuration defines the life of the installed filter. A timer will count down from this number while the indoor fan is running. At the expiration of this timer, an alert will be activated to indicate a filter change is required.

TEST MODE TIMEOUT

This configuration defines the time at which a test mode test has not changed state will automatically disable test mode. This configuration will disable the timeout when set to 0 (Disabled).

CCH MAX TEMP

This configuration defines the temperature threshold for which the crankcase heater is no longer required to heat the compressor shell.

STD BARO PRESSURE

This conf i guration is used to speci fy the job location’s s tandard barometer pressure reading. This will feed the BAROMETRIC PRESS when a network is not writing to it. This should be used to account for job site eleva t ion if enthalpy calcula t ions are being used.

LINK STAGEUP TIME

This configuration sets the cooling and heating stage up time during linkage operation.

Configurable Switches and Analog sensors

The SystemVut controll er has optional configurable inputs. These consist of five physica l board switch inputs (disc r ete inputs) and three physical board analog inputs. There are more functions allowed for configuration than ther e are inputs. Each function will have a configuration for which input channel it is assigned to. Each switch function will als o have a switch type configuration which defines that switches normal stat e. Table 6 shows the configurabl e functions and what their normal and active states are. Ta ble 7 shows the configurable analog input functi ons. The switc h configurations can be found in the

SETTINGSUNIT CONFIGURATIONSSWITCH INPUT CONFIGS sub--menu. The analog input configura tions can be found in the SETTINGUNIT CONFIGURATIONSSWITCH INPUT CONFIGS sub--menu. The configurabl e input assignment can be viewed in the SERVICEHARDWAREASSIGNED INPUTS/OUTPUTS sub--menu.

Table 6 – Configurable Switch Input Functions

Function Description Normal State Active State

Humidistat OFF ON

Condensate Overflow LOW HIGH

Phase Monitor NORMAL ALARM

Filter Status Switch CLEAN DIRTY

Remote Occupancy UNOCC OCCUPIED

Remote Shutdown RUN SHUTDOWN

Fan Status OFF ON

General Status Switch NORMAL ALARM

IAQ Override OFF ON

Enthalpy Switch Input LOW HIGH

Table 7 – Configurable Analog Input Functions

Function Description Sensor Type Sensor Values

Space Relative Humidity Sensor 0--- 2 0m A %RH

Outside Air Relative Humidity Sensor 0 --- 20 m A %RH

Return Air Relative Humidity Sensor 0 --- 20 m A %RH

Indoor Air CO2Sensor 0 --- 20 m A PPM

Outside Air CO2Sensor 0 --- 20m A PPM

Outdoor CFM Sensor 0 --- 2 0 m A CFM

General Operation

48/50FC and 48/50GC units can provide cooling, dehumidification, heating, and ventilation. The operating mode (MODE) shows the highest level of operation of the unit at any given time. The operating sub--mode (SUB--MODE) shows the detail operation occurring while under a specific mode. Fig. 8 shows the MODE and SUB--MODE values.

Each unit will operate under one of three basic types of control, thermostat, space temperature sensor, or return air 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. The control will set the demand based on these types of control and conditions, which then drives the operating mode.

When thermostat control is enabled (UNIT CONTROL TYPE), 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 (THERMOSTAT TYPE) affects how cooling operates based on Y1 and Y2 commands and if cooling/heating stage time guards are applied.

When space temperature sensor control in enabled (UNIT CONTROL TYPE), the unit will try to maintain the Space Temperature (SPACE TEMPERATURE) between the effective cool and heat setpoints (EFF COOL SETPOINT and EFF HEAT SETPOINT). 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. Linkage operation overrides the mode changeover delay to 15 seconds. The cooling and heating Mode Select Time guards (COOL MODE T.GUARD and HEAT MODE T.GUARD) show the remaining time before allowing the respective mode to be entered.

Demand Determination

Based on the unit control type (UNIT CONTROL TYPE),alarm conditions, and user interaction, the control will determine an overall demand of the unit. Table 8 shows the possible system demands with their priority level and summary description.

Thermostat Demand

When the unit control type is configured for thermostat (UNIT CONTROL TYPE = TSTAT) the level 5 demand in Table 8 will be

determined by thermostat inputs and the Thermostat Type configuration (THERMOSTAT TYPE) as shown in the tables below. Table 9 shows the cooling thermostat inputs and how they map to the system demand. Table 10 shows the heating thermostat inputs and how they map to the system demand.

MODE OFF VENT COOL HEAT TEST

STARTING UP MODE TIMEGUARD ECON FREE COOLING HEATING MANUAL TEST

SUB-

MODE

IDLE - NO DEMAND

MODE TIMEGUARD MECH. COOLING

UNIT DISABLED ECON/MECH COOLING

URGENT SHUTDOWN DEHUMIDIFICATION

SAFETY CONTROL DEHUM/MECH COOL

SUPPLY FAN ON UNOCC. FREE COOL

DEHUM PREVENTED

COOLING PREVENTED

SHUTTING COOL OFF

OUTSIDE AIR TEMPERING

HEATING PREVENTED

SHUTTING HEAT OFF

AUTO TEST

SHUTTING TEST OFF

Fig. 8 -- Modes and Sub--Modes

a48--- 9374

Table 8 – Demand List and Priority

DEMAND Priority Description

EMERGENCY 1 An emergency condition occurs which requires a unit shutdown

SAFETY FAULT 2 A safety diagnostic requires the unit to run in safety mode.

SERVICE TEST 3 User request test mode

SHUTDOWN 4 A minor or user condition requires the unit to shutdown

NO DEMAND

FAN ONLY Only circulation or ventilation is requested form the building

DEHUM A dehumidification load is present in the building

LOW COOL A low cooling load is present in the building

HIGH COOL A high coolin g load is present in the building

LOW COOL & DEHUM A low cooling and dehumidification load is present in the building

HIGH COOL & DEHUM A high cooling and dehumidification load is present in the building

UFC LOW COOL A low cooling load is present in the building due to the unoccupied free cooling algorithm

UFC HIGH COOL A high cooling load is present in the building due to the unoccupied free cooling algorithm

LOW HEAT A low heating load is present in the building

HIGH HEAT A high heating load is present in the building

SUPPLY AIR TEMPERING Due to outside air, supply air is uncomfortably cool during ventilation

There is no comfort demand from the building

Table 9 – Thermostat Cooling System Demands

Thermostat Inputs THERMOSTAT TYPE

Y1 Y2 CONV 2C2H* CONV 3C2H DIGI 2C2H DIGI 3C2H

0 0 No C ool No Cool No Cool No Cool

0 1 Alert & Low Cool Alert & Low Cool High C o ol High Cool

1 0 Low C ool Low Cool Low Cool Low Cool

1 1 High Cool High Cool High Cool High Cool

*SettheLOW COOL COMP as needed.

Table 10 – Thermostat Heating System Demands

Thermostat Input THERMOSTAT TYPE

W1 W2

0 0 No Heat No Heat

0 1 Alert & Low Heat High Heat

1 0 Low Heat Low Heat

1 1 High Heat High Heat

CONV 2C2H CONV 3C2H

DIGI 2C2H DIGI 3C2H

Space Sensor Demand

When the unit control type is configured for space sensor (UNIT CONTROL TYPE = SPACE SEN) the level 5 demand in Table 8

will be determined by the space sensor inputs and setpoints as described below. The Effective Demand Temperature (DEMAND CTRL TEMP) represents the temperature which the control is using to control the space. This would come from the space sensor, building network, linkage, or the return air sensor.

Setpoint Determination

Setpoints are used to control the unit. The Cool Setpoint in Effect

(EFF COOL SETPOINT) and the Heat Setpoint in Effect (EFF HEAT SETPOINT) are the points in which the unit is controlling

to at a specific time. These points are read only points and change according to occupancy, the offset slider status, and network writes. The setpoint configurations are in the SETTINGSSPACE SET POINTS submenu.

If the building is in occupied mode, the Occupied Cool Setpoint

(OCC COOL SETPOINT) and the Occupied Heat Setpoint (OCC HEAT SETPOINT) are active. When the building is in unoccupied mode, the Unoccupied Cool Setpoint (UNOCC COOL SETPNT) and the Unoccupied Heat Setpoint (UNOCC HEAT SETPNT) are active. The heating and cooling set points are also

separated by a Heat-- Cool Set Point Gap (HEAT-COOL SP 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 (+/--) (SPT SLIDER RANGE) 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 (SLIDER OFFSET VAL).

Temperature Demand

Space sensor staging control is an adaptive anticipation control that weighs the actual space demand against the trend of that demand. The control tries to anticipate the change in the space because of its current stage status. This anticipation is based on the demand trends. These trends will show the control how the space is reacting to the current running conditions and help it decide when to change the actual demand of the system. The following points are in the RUN STATUSMODE submenu:

COOLING DEMAND — This is the difference between the Cool Setpoint in Effect (EFF COOL SETPOINT) and the Effective Demand Temperature (DEMAND CTRL TEMP) representing the demand of the space for cooling.

COOL DEMAND TREND — This is the rate of change of the cooling demand in degrees per minute, representing how the space is changing its demand for cooling.

HEATING DEMAND — This is the difference between the Heat Setpoint in Effect (EFF HEAT SETPOINT) and the Effective Demand Temperature (DEMAND CTRL TEMP) representing the demand of the space for cooling.

HEAT DEMAND TREND — This is the rate of change of the heating demand in degrees per minute, representing how the space is changing its demand for cooling.

In general the system demand will increase based on the demand compared to the demand switch states in Fig. 9. The demand cannot increase until Time guard 1 (DEMAND TIMEGUARD1) expires. The LCON and LHON thresholds will also cause the

system demand to be reduced. When the demand hits the off switch stages the system demand will be set to NO DEMAND. These switch stages are in the SETTINGSSET POINTSTEMP DEMAND CONFIG submenu.

The cooling and heating demand level up configurations (COOL DMD LEVEL UP and HEAT DMD LEVEL UP) will restrict a system demand increase if the demand trend is less than the level up configuration. These level up configurations will also increase the system demand if the demand trend is greater than it for greater than the Time guard 2 (DEMAND TIMEGUARD2).

The system demand will increase if it has remained at the same state for greater than Time Guard 3 (DEMAND TIMEGUARD3).

HCON

Decrease

LCON

Cool Setpoint

Heat Setpoint

LHON

HHON

Demand

LCOF

LHOF

Decrease

Demand

SPACE TEMP

a48--- 10313

Fig. 9 -- Space Sensor System Demand Switch States

RA T Demand

When the unit control type is configured for return air sensor (UNIT CONTROL TYPE = RAT SEN) the level 5 demand in Table 8 will be determined the same as space sensor but using the return air temperature (RETURN AIR TEMP) instead of the space temperature (SPACE TEMPERATURE).

Humidity Demand

When the unit is configured for either a Humidistat input

(HUMSTAT CHANNEL) or Space Humidity Sensor (SPRH SENS CHANNEL) the level 5 demand in Table 8 will include a

determination of dehumidification demand.

Humidistat

When receiving an active input from the Humidistat (HUMIDISTAT), dehumidification will be demanded.

Space Relative Humidity

On units with a relative humidity sensor, when the received value of space relative humidity (SPRH LEVEL) has exceed the humidity set point (SPRH SET POINT), dehumidification will be demanded. This demand will remain until the space relative humidity has fallen below the humidity set point by more than the humidity set point deadband (SPRH DEADBAND). This would come from the space humidity sensor, or building network.

Occupancy Determination

The building’s occupancy is affected by a number of different factors. Occupancy affects the unit set points and the operation of the economizer. 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 two ways. Listed in order of priority: force on OCCUPIED, and a Linkage write. The CCN point OCCUPIED is forced via an external device such as a ComfortIDt 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 unit is being controlled by Linkage, the occupancy is communicated and mapped to OCCUPIED as an input. Linkage does not force the point only write to it, therefore a force applied to OCCUPIED will override it.

If OCCUPIED is not being forced or written to, proceed to the level 2 priority.

Level 2 Priority

Level 2 is considered occupant interaction, and consists of Timed Override and Remote Occupancy Switch. A timed override button press will override a remote occupancy switch if both are installed for operation.

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, or T--59 space temperature sensor. The length of the override period when pressing the override button is determined by the Override Time Limit (TIMED OVR LENGTH). The hours remaining in override is displayed as Timed Override Hours (TIMED OVR HOURS). This point can also be changed from the local display or network to set or change the override period length.

Remote Occupancy Switch (REMOTE OCC SWITCH) can be forced or configured for operation based on an actual switch. The physical 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 two possible configurations for the remote occupancy switch:

1. (REMOTE OCC TYPE = 0) Normally Open Switch

2. (REMOTE OCC TYPE = 1) Normally Closed Switch

If the switch is configured to No Switch (REMOTE OCC CHAN = None), the swit ch input value will be ignored and s oftware will proceed to level 3 priority. For each type of switch, the appropriate configuration and states are listed in the table below.

TYPE OF SWITCH

Occupied when

Closed or Unoccupied

when Open

Occupied when Open

or Unoccupied when

Closed

SWITCH

CONFIGURATION

Normal Open ( 0)

Normal Closed ( 1)

STATE OF SWITCH

AND STATE OF

OCCUP A NCY

Open and Unoccupied

Closed and Occupied

Open and Occupied

Closed and

Unoccupied

Level 3 Priority

The following occupancy options are determined by the state of Occupancy Schedule Number (SCHEDULE NUMBER) and the Global Schedule Broadcast (BROADCAST SCHEDL?).

1. (SCHEDULE NUMBER = 0) The unit is always considered occupied and the programmed schedule is ignored. This is the factory default.

2. (SCHEDULE NUMBER = 1 - 64) Follow the local programmed schedule. Schedules 1 to 64 are local within the controller. The unit can only store one local schedule and therefore changing this number only changes the title of the schedule table.

3. (SCHEDULE NUMBER = 65- 99) Follow the global programmed schedule. If the unit is configured as a Global Schedule Broadcaster (BROADCAST SCHEDL? = YES), the unit will follow the 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 (BROADCAST SCHEDL? = NO), the unit will receive broadcasted schedules from a unit programmed to broadcast this schedule number.

unit s programmed schedule and

Indoor Fan Operation

These units use the Staged Air V olume (SAV) method of controlling the supply fan for a typical constant volume rooftop unit. This control method employs an Electronic Commutated Motor (ECM) to operate the supply fan at different speeds in order to achieve energy savings through reduced fan power. This method is specif ically not concerned with controlling static pressure in the supply duct, but rather with setting different fan speeds for different operating condit i ons, such as ventilation mode or part-- load mechanical cooling.

The SAV function is NOT a Variable Air Volume (VAV) function. The fan adapts its speed to one of eight based on mode and current state to satisfy a demand. The eight speeds consist of off (0%) and seven configurable values. The seven configurable fan speeds are: Maximum Speed (MAXIMUM IDF SPEED), Ventilation (VENT

IDF SPEED), Heating (HEATING IDF SPD), Free Cool (FREE COOL IDF SPD), Mechanical Low Cooling (LOW COOL IDF SPD), Mechanical Medium Cooling (MED COOL IDF SPD),and

Mechanical High Cooling (HIGH COOL IDF SPD),TheECMis powered direct from the distribution block and is always on with power applied unless the CB is tripped. When the thermostat or space sensor control conditions require the fan on, the ECM will then be ramped to desired speed. Fan speed is always calculated by evaluating the current applicable conditions. Each fan speed condition is evaluated independently, and the highest fan speed is used. For example, if a cooling call occurs during V entilation mode, the unit mode will transition to cooling but the fan speed is set to the higher of the two (VENT IDF SPEED or LOW COOL IDF SPD). Refer to the speed configurations below for when the fan will run at them.

The Commanded Fan Speed (OUTPUTSGENERAL OUTPUTSCOMMANDED IDF RPM) represents the controls commanded speed for the fan at any given time. This commanded speed is dete rmined by the unit’s current HV AC mode and the unit control type. For gas hea ting units, the IGC f an request output (InputsGEN. II G C.F) is monitored by the control. This can result in additional modificat ion of fan del ays or other operation due to safety funct i ons of the IGC control. See the Gas Heating operat i on section for more details. If configure d 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 run under thermostat or spac e sensor control and will rema i n on if compressors or heat relays are ever stuck on. If Shut Down on IDF Failure is enabled (SHUTDOWN IDF FAIL = Ye s ) , the fa n a nd unit will be shutdown without delay on fan a larm conditions. Fan off delays are honored when exiting specific HV AC modes. The Fan--off Dela y delays are as follows: Cooling (COOL F ANOFF DELAY), and Heating (HEAT FANOFF DELAY).

Indoor (Supply) Fan Maximum Speed (MAXIMUM IDF SPEED)

Max speed is the highest fan speed allowed. This is typically set to deliver design CFM to the space per job requirement. Most safety conditions for the unit will override the fan speed to this to help protect the unit.

IMPORTANT: MAXIMUM IDF SPEED is used in the minimum position curves and therefor important to set properly.

Ventilation Indoor Fan Speed (VENT IDF SPEED)

This configuration defines the fan speed used in Ventilation (fan--only) mode. Ventilation mode is when the supply fan is running, but there is no demand for heating or cooling. In thermostat mode, this is with just a G call. In space sensor control, this is when the unit is Occupied mode and the indoor fan is configured to always run while occupied (OCCUPIED FAN?).If the indoor fan is configured for intermittent fan (OCCUPIED FAN? = No ) , the Mode will be off instead of Ve ntilation and the fan will not run unless a heating or cooling mode is needed. During the unoccupied period, the fan will always operate intermittently.

The economizer damper will adjust its position based on how far away this speed is from max speed for ventilation.

IMPORTANT: It is important that the ventilation rate is checked after setting this speed to verify that the unit can properly ventilate the space per requirements . Adj usting this conf i guration or the economizer minimum setting curve should be performed to meet job require m ents.

Heating Indoor Fan Speed (HEATING IDF SPD)

This configuration defines the fan speed used when in heating mode and running heat. On units equipped with Gas heat (UNIT TYPE OF HEAT), this heat speed will be delayed on based on the IGC’s fan on call (IGC FAN REQUEST). Once the IGC request the fan the fan will run what this heating speed configuration is set for until heating is ended. On units configured for Electric heat (UNIT TYPE OF HEAT) and configured for Preheat without the fan (PREHEAT W/O IDF), this heat speed will be delayed on based on the Preheat fan delay time (PREHEAT FAN DELAY). Once this preheat time has expired or not configured for preheat, the fan will run at this heat speed while heat is on.

Free Co oling Indoor Fan Speed (FREE COOL IDF SPD)

This configuration defines the initial fan speed used when in Free Cooling. Refer to the Economizer Controls Operation section for details on free cooling. The fan will stay at this configured speed whenever only the damper is being used for free cooling. If the damper is at 100% for 5 minutes the fan will ramp to the high cooling speed. It is locked there until the actual damper position falls below 75% at which time it will ramp back down to this configured speed.

Low Cooling Indoor Fan Speed (LOW COOL IDF SPD)

This configuration defines the fan speed used when the first stage of mechanical cooling is being performed.

High Cooling Indoor Fan Speed (HIGH COOL IDF SPD)

This configuration defines the fan speed used when all (full load) stages of mechanical cooling is being performed. When performing integrated cooling with the economizer this speed will be used. When only free cooling with a high cool demand, this spee d will be used.

Cooling Operation

The unit’s cooling operation consists of: demand and mode determination, staging request to satisfy the demand, and handling a request with the unit’s resources. These resources can include compressors, Humidi--MiZer speed based on options. This section covers mechanical cooling. For economizer free cooling, refer to the Economizer Operation section (starting on page 22).

For Humidi--MiZer system operation, refer to the Optional Humidi--MiZer Dehumidification System section (see page 17).

Cooling Mode Control

The cooling HVAC mode (OPERATING MODE) has 9 different operating sub modes (SUBMODE): ECON FREE COOLING, UNOCC. FREE COOL, MECH. COOLING, ECON/MECH COOLING, DEHUMIDI FICATION, DEHUM/MECH COOLING, DEHUM PREVENTED, COOLING PREVENTED, a nd SHUTTING COOL OFF . These are all part of a general cooling mode and rese mble the specific type of cool ing that is being performed at any given time. All types of cooling are still performed under the general cooling function, and the expande d text is for user reference only.

For the unit to enter cooling mode, three 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 cooling or dehumidifi cation demand (Y1, Y2, space cool demand, or humidity demand). The unit will rema in in cooling for at least one minute or until any of the above conditions turn false. The cooling mode does not off i cially end until the compress or is off and the fan off delay has expired.

system, an economizer, and fan

Cooling Staging Control

Once the unit is in a cooling mode, determine what the demand is and how to satisfy it. If an economizer is installed and can be used for cooling (OK TO USE FREE COOLING? = Yes), the unit will use it first (see economizer section for its operation). If the economizer cannot be used or additional cooling is needed, a mechanical cooling check is performed. OK to use Compressors? (OK TO USE COMPS?) will be set to yes when the outdoor temperature (OUTDOOR AIR TEMP) is above the Circuit A Lockout temperature (CIR.A LOCKOUT OAT) and the Circuit A is not locked out for diagnostic reasons (CIRCUIT A LOCKOUT). Based on the unit control configuration, requested cooling stages (REQ. COOL STAGES) will be determined then passed to compressor control to actually add the cooling stages.

There are two ways of requesting stages when thermostat control is enabled, Traditional thermostat control or adaptive control. Traditional thermostat control is used if set for non--adaptive thermostat (ADAPTIVE TSTAT = NO) and the unit cannot use the economizer for free cooling. If set for adaptive thermostat (ADAPTIVE TSTAT = YES) or any time the economizer is available for free cooling, the unit will use adaptive control for staging.

When configured for Space sensor or RAT control (UNIT CONTOL TYPE) the unit will use adaptive control for staging. With either staging method there are two supply air temperature limits that apply, one restricts more cooling stages and the other will remove cooling stages. If at any time the Supply-- Air Temperature (SUPPLY AIR TEMP) falls below the Minimum Supply Air Temperature Upper Level (UPPER MIN SAT),the requested stages will not be allowed to increase. If at any time the SAT falls below the Minimum Supply Air Temperature Lower Level (LOWER MIN SAT), the requested stages will be reduced by one. If these SAT limits are configured so that they are too close together, the last stage might cycle rapidly, slowed only by its minimum on and off--time requirements.

Adaptive Control

Stage timers and Supply air trend apply when determining the request for stages. The first request (REQ. COOL STAGES =1) comes immediately when starting the staging process. The Cool Stage Increase Time (COOL STAGEUP TIME) has to expire and the Supply--Air Trend (SUPPLY AIR TREND) has to be above the cooling supply air trend level (COOL SATTREND LEV) before another stage can be added. Requested stages will only be allowed to increase as the actual system demand allows (DEMAND). A “LOW COOL” demand will only allow one requested stage, and “HIGH COOL” all stages. The requested stages will be reduced if the cooling demand is lowered or dropped completely, or if the supply air falls below the lower level (LOWER MIN SAT).

Traditional Thermostat Control

Stage timers and Supply air trend do not apply when determini ng the request for stage s. Request staging will follow the ther mostat inputs directly. “LOW COOL” will request one stage.“HIGH COOL” will request two stages.

Compressor Control

The compres sor control works hand and hand with the staging control. As the stagi ng control request stages , the compressor control determines what is available or running and tries to provide stages for what is requested. The availability of the compressors depends on time guards, circ uit diagnost ics, and outdoor temperat ure.

There are time guards to protect the compressor, Compressor Min On Time (COMP MIN ON TIME) and Compressor Min Off Time (COMP MIN OFF TIME) apply before the compressor can be turned back on or turned off. Timeguard A1 (COMP A1

TIMEGUARD) and Timeguard loader (COMP LDR TIMEGUARD) display the time the compressor and loader have

before available for use.

Circui t diagnostic tests are perform ed during operation which may or may not allow the compressor to be used. The availability of the compre ssor is shown as Compressor A1 A vailable (COMP A1 A VAILABLE). The loc kout sta tus of the compressor is shown as Compres s or A1 Lockout (COMP A1 LOCKOUT). The actua l stages running at any given time is displayed as Actual Cooling St a ges (ACTIVE COOL STAGE). Individual c om pressor output state is shown as (COMPRESSOR A1) and (COMP A LOADER).

Any time the outdoor ambient fall s below the low cooling minimum outdoor te mperature (LOW COOL MIN OA T) , the low cooling lockout will be active (LOW COOL LOCKOUT) preventing compre ssor A1 from running by itself. This means the loader will be on with the compressor .

Outdoor Fan Control

The outdoor fan can be set for a single speed or 2 speed motor. The 3 to 5 ton 48/50FC units will have a single speed ODF. The 3 to 5 ton 48/50GC and the 6 ton 48/50FC will have a 2 speed ODF. The ODF Relay Enabled (ODF RELAY ENABLE) point will tell the control when a 2 speed motor is installed. The 2 speed relay state output is shown as Outdoor Fan Speed Relay (ODF SPEED RELAY). Units with a low ambient option or Humidi--MiZer option will also be equipped with a head pressure control device.

Normal Operation

On the single speed ODF system, the ODF will come on and off with the compressor. On the 2 speed ODF systems, the ODF will come on and off with the compre ssor at low speed. The High speed ODF will be acti ve when the compressor loader is on, and done by energiz ing the ODF SPEED RELAY.

Low Ambient Operation

When equipped with the head pressure device and the OAT is below approximately 40_F, the ODF speed will vary based on the condensing temperature. Regardless of active low or high speed the head pressure device will modulate the ODF speed to maintain approximately 95_F temperature at the coil sensor location. In low speed operation however the head pressure device cannot use high speed if needed until the control turns on the ODF SPEED RELAY.

Humidi--MiZer

When equipped with the head pressure device and reheat is active, the ODF speed will vary based on the condensing temperat ure. Regardles s of acti ve low or high spee d the head pressure device will modulate the ODF speed to maintain approximately 95_F temperature at the coil sensor location. In low speed operation however the head pres sure device cannot use high speed if needed until the control turns on the ODF SPEED RELAY.

Operation

Optional Humidi--MiZer Dehumidification System

Units with the factory--installed Humidi--MiZer system option are capable of providing multiple modes of improved dehumidification as a variation of the normal cooling cycle. The Humidi--MiZer system option includes additional valves in the liquid line and discharge line of the refrigerant circuit and a reheat coil downstream of the evaporator. The Humidi--MiZer sys t em equipped configuration is factory set to Y es for Humidi--MiZer system equipped units (REHEAT EQUIPPED = YES). This enables Humidi--MiZer system operating modes and service test.

Humidi--MiZer system operation requires the install ation and configuration of a relative humidity switch input or a space relat ive humidity sensor. These provide the dehumidification demand to the control.

Dehumidification Demand

When using a humidistat or switch input, the demand for dehumidification is seen as Space Humidity Switch (INPUTSSWITCH INPUTSHUMIDIST AT) being Off or On. An Off value means humidity level is good and an On value means that dehumidification is needed.

When using an SPRH sensor, the demand is based on the Space Humidity Sensor (INPUTSANALOG INPUTSLEVEL) value compared to the Space RH Setpoint (SETTINGSSPACE SETPOINTSOCC SPRH SETPOINT or UNOCC SPRH SP).If the Space Humidity Sensor (SPRH) value is above the Space RH Setpoint , then dehumidification is needed. I f the Space Humi di ty Sensor (SPRH) value is below the Space RH Set point minus the Space RH Deadband (SETTINGSCOOLINGSPRH DEADBAND), then dehumidif ication is no longer needed.

NOTE: When there is a dehumidification demand, the economizer damper position is limited to its minimum damper position.

Humidi--MiZerRSystem Modes

With Humidi--MiZer system units there are two additional HVAC modes available for the user: Dehumidification and Dehum/Mech Cooling. Selection of the Dehum/Mech Cooling mode is determined by the dehumidification demand and the cooling demand. Table 11 shows the corresponding circuit mode and output status for the different demand combinations.

Normal Cooling

This mode is the standard rated cooling system performance, and occurs when there is cooling demand without dehumidification demand.

For 48/50FC 04--06 units, refrigerant flows through the outdoor condenser and is diverted away from the reheat coil with the open Cooling Liquid Valve (CLV) into the expansion device. Figure 10 shows the complete refrigerant flow.

For 48/50GC 04--06 and 48/50FC 07 units, refrigerant flows through the outdoor condenser and is diverted away from the reheat coil with the closed Reheat Liquid Valve (RLV) and open Cooling Liquid Valve (CLV) into the expansion device. Figure 11 shows the complete refrigerant flow.

Dehum/Mech Cooling (Subcooling) Mode

This mode increases the latent heat removal and decreases sensible cooling compared to normal cooling. This occurs when there is a cooling and dehumidification demands.

For 48/50FC 04--06 units, refrigerant flows through the outdoor condenser and is diverted through the reheat coil with the closed

Cooling Liquid Valve (CLV) into the expansion device. Figure 12 shows the complete refrigerant flow.

For 48/50GC 04--06 and 48/50FC 07 units, refrigerant flows through the outdoor condenser and is diverted through the reheat coil with the open Reheat Liquid Valve (RLV) and closed Cooling Liquid Valve (CLV) into the expansion device. Figure 13 shows the complete refrigerant flow.

Dehumidification (Hot Gas Reheat) Mode

This mode provides maximum latent cooling with little to no sensible capacity. This occurs when there is a dehumidification demand and no cooling demand.

For 48/50FC 04--06 units, refrigerant flows through the outdoor condenser and mixes with hot gas bypassing the condenser, then diverted through the reheat coil with the closed Cooling Liquid Valve (CLV) into the expansion device. Figure 14 shows the complete refrigerant flow.

For 48/50GC 04--06 and 48/50FC 07 units, refrigerant flows through the outdoor condenser and mixes with hot gas bypassing the condenser, then diverted through the reheat coil with the open Reheat Liquid Valve (RLV) and closed Cooling Liquid Valve (CLV) into the expansion device. Figure 15 shows the complete refrigerant flow.

Reheat Control

When there is only a cooling demand, the unit will operate in normal cooling mode. When there is only dehumidification demand, the unit will operate in Dehumidification mode (Hot Gas Reheat). When there is both cooling demand and dehumidification demand, the unit will operate in Dehum/Mech Cooling mode (Subcooling). During Dehumidification and Dehum/Mech cooling mode, the unit will run all cooling stages. The unit can be restricted from reheat operation by the outside temperature HUMZ

LOCKOUT OAT (SETTINGSUNIT CONFIGURATIONS COOLINGDEHUMIDIFICATIONREHEAT OAT LIMIT)

sets the lowest outside temperature the unit is allowed to run reheat control (Default = 40_F).

T abl e 11 – Humidi--MiZer System Control Modes -- Sizes 04--07

DEMAND AND MODE OUTPUTS

Dehumidification

Demand

No Power No Power No power Off

No No Off Off

No Yes COOL On

Ye s Yes

Yse No DEHUM On

Cooling Demand Mode Compressor RDV CLV

DEHUM/MECH

COOL

De---en er gized

(no flow)

De---en er gized

(no flow)

De---en er gized

(no flow)

De---en er gized

(no flow)

Energized

(flow)

D e --- e n e r gi z e d

(flow)

D e --- e n e r gi z e d

(flow)

D e --- e n e r gi z e d

(flow)

Energized

(no flow)

Energized

(no flow)

RLV

(48/50FC 07 and

48/50GC 04-- -06 only)

De---energized

(flow)

Energized

(no flow)

Energized

(no flow)

De---energized

(flow)

De---energized

(flow)

RDV

VALVE

INDOOR LEAVING

AIR

REHEAT MODE

METERING

DEVICE (TXV)

CONDENSER COIL

OUTDOOR AIR

VALVE

COMPRESSOR

= CLOSED VALVE

= OPEN VALVE

HUMIDI-MIZER COIL

CLV

EVAPORATOR COIL

INDOOR ENTERING

AIR

Fig. 10 -- Normal Cooling Mode – Humidi--MiZer System with Single Stage Cooling, 48/50FC 04--06

RDV

VALVE

COMPRESSOR

CONDENSER COIL

OUTDOOR AIR

RLV

VALVE

CLV

VALVE

INDOOR SUPPLY

AIR

HUMIDI-MIZER COIL

EXPANSION

VALVE

(TXV)

a48--- 9191

EVAPORATOR COIL

= CLOSED VALVE

= OPEN VALVE

INDOOR RETURN

AIR

Fig. 11 -- Normal Cooling Mode – Humidi--MiZer System with 2 Stage Cooling, 48/50GC 04--06 and 48/50FC 07

RDV

VALVE

CONDENSER COIL

OUTDOOR AIR

CLV

VALVE

COMPRESSOR

= CLOSED VA LVE

= OPEN VALVE

INDOOR LEAVING

AIR

HUMIDI-MIZER COIL

EVAPORATOR COIL

INDOOR ENTERING

AIR

REHEAT MODE

METERING

DEVICE (TXV)

a48--- 10188

Subcooling Mode (Reheat 1) − Humidi−MiZer System with Single Stage Cooling

Fig. 12 -- Subcooling Mode – Humidi--MiZer System with Single Stage Cooling, 48/50FC 04--06

a48--- 9192

RDV

VALVE

INDOOR SUPPLY

AIR

HUMIDI-MIZER COIL

EXPANSION

EVAPORATOR COIL

INDOOR RETURN

AIR

VALVE

(TXV)

COMPRESSOR

= CLOSED VALVE

= OPEN VALVE

CONDENSER COIL

OUTDOOR AIR

RLV

VALVE

CLV

VALVE

Fig. 13 -- Subcooling Mode – Humidi--MiZer System with 2 Stage Cooling, 48/50GC 04--06 and 48/50FC 07

RDV

VALVE

CONDENSER COIL

INDOOR LEAVING

AIR

REHEAT MODE

METERING

DEVICE (TXV)

HUMIDI-MIZER COIL

a48--- 10189

OUTDOOR AIR

COMPRESSOR

= CLOSED VALVE

= OPEN VALVE

CLV

VALVE

EVAPORATOR COIL

INDOOR ENTERING

AIR

Fig. 14 -- Hot Gas Reheat Mode – Humidi-- MiZer System with Single Stage Cooling, 48/50FC 04--06

RDV

VALVE

COMPRESSOR

CONDENSER COIL

OUTDOOR AIR

RLV

VALVE

CLV

VALVE

INDOOR SUPPLY

AIR

HUMIDI-MIZER COIL

EXPANSION

VALVE

(TXV)

a48--- 9193

EVAPORATOR COIL

= CLOSED VALVE

= OPEN VALVE

INDOOR RETURN

AIR

Fig. 15 -- Hot Gas Reheat Mode – Humidi-- MiZer System with 2 Stage Cooling, 48/50GC 04--06 and 48/50FC 07

a48--- 10190

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MODE menu. 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 RUN S TATUSCOOLDEHUMIDIFICATION.TheService Test mode may be used to force the system to operate Dehumidification mode (Hot Gas Reheat) and Dehum/Mech Cooling mode (Subcooling), or to independently operate the reheat valve control outputs.

The following forced operating states are available service test operations for a Humidi-- MiZer system equipped unit:

SERVICE TEST  COOL TEST  HUMIDIMIZER TEST

A value of “0” sets reheat control test to “Off.”

SERVICE TEST  COOL TEST  HUMIDIMIZER TEST

A value of “1=SUBCOOL” sets Humidi--MiZer control test to “Dehum/ M ech Cooling mode (Subcooling) .”

SERVICE TEST  COOL TEST  HUMIDIMIZER TEST

A value of “2=REHEAT” sets Humidi--MiZer tes t to “Dehumidification mode (Hot Gas Reheat).”

SERVICE TEST  INDEPENDENTS  RH LIQ VALVE TEST

A value of “On” will turn on the Reheat Liquid V alve (RLV) .

SERVICE TEST  INDEPENDENTS  RH DIS VALVE TEST

A value of “On” will turn on the Reheat Discharge Valve (RDV).

SERVICE TEST  INDEPENDENTS  CL LIQ VALVE TEST

A value of “On” will turn on the Cooling Liquid Valve (RDV).

Indoor Fan Based Dehumidification

Units that are not factory configured for Humidi--Mizer operation can be set for improved dehumidification operation through fan



based humidification (FBD), SETTINGS



CONFIGURATIONS



FBD CONTROL TYPE. Units are factory defaulted to FBD

CONTROL TYPE = 0 which means that any dehum demand is

ignored. There are two fan based dehumidification options, Max Comfort (FBD CONTROL TYPE = 1)andMax Dehumidification (FBD CONTROL TYPE = 2). Fan based dehumidification requires the installation and configuration of either a space relative humidity sensor or a relative humidity switch input.

COOLINGFAN BASED DEHUM

UNIT

Max Dehum

When the FBD Type is set to (2) Max Dehum, the control will try to satisfy the dehumidification demand. When the unit receives a dehum demand a PID control algori thm will modulate the indoor fan while the compressor is running to mainta in minimum suction tempe rature (FBDH_SST). The cooling stages will be contr olled as normal cooling demand requests, only the IDF will change for dehumidification demand.

Max Comfort

When the FBD Type is set to (1) Max Comfort, the control will try to satisfy the dehumidification demand and minimize cold air dump. When the unit receives a dehum demand a PID control algorithm will modulate the indoor fan while the compressor is running to maintain the minimum FBD supply air comfort set point (FBDH_SAT) while also maintaining the minimum suction temperature (FBDH_SST). The cooling stages will be controlled as normal cool ing demand requests, only the IDF will change for dehumidification demand.

Heating Operation

The unit’s heating operation consists of: demand and 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 (UNIT TYPE OF HEAT)

configuration will be factory set to 1 for gas units and 0 for electric heat units. 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 (OPERATING MODE) has 3 different operating sub modes (SUBMODE): HEATING, HEATING PREVENTED, and SHUTTING HEAT OFF. These are all part of a general heating mode and resemble the action heat mode is taking at any given time. All types of heating are still performed under the general heating function, and the expanded text is for user reference only.

For the unit to be allowed to enter the heat mode, three things must be true: the indoor fan must be ok t o use, the mode change over time guard must be expired, and there must be a heating demand. The unit will remain in heating for at least one minute and until the demand is dropped or if any of the above conditions are false. The heating mode does not officially end until all heat stages are off, the fan off delay has expired, and the IGC fan request is dropped.

Supply--Air Temperature Sensor (SA T) Heat Mode

The SAT Heat Mode Sensing (SAT DURING HEAT?) informs the unit that the supply air sensor is valid during heating in its current location. This configuration affects the Supply Air T emperat ure (SUPPLY AIR TEMP) value displayed as listed below.

When SAT DURING HEAT? is disabled, the Supply Air Temperature (SUPPLY AIR TEMP) value on the SystemVut display and the network will hold a zero when heat outputs come ON and for 5 minutes after.

When SAT DURING HEAT? is enabled, the Supply Air Te mperature (SUPPLY AIR TEMP) sensor reading is displayed at the SystemVu controller and network during heating mode.

Heating Staging Control

Once the unit is in a heating mode, it determines what the demand is and how to satisfy it. Requested Heating Stages (REQ. HEAT STAGES) will be determined then passed to heat control to actually add the heating stages. To request stages the number of heat stages (HEATING STAGE QTY) must be greater than zero. As a gas unit this will be set in the factory, however 50GC units may have heat installed as accessories. If the Outdoor Air Temperature (OUTDOOR AIR TEMP) is greater than the Heating Lockout Temp (HEAT LOCKOUT OAT), all the heat stages will be locked out (HEAT LOCKOUT).

There are two ways of requesting stages when thermostat control is enabled, traditional thermostat control or adaptive control. Traditional thermostat control is used if set for non--adaptive thermostat (ADAPTIVE TSTAT = NO). If set for adaptive thermostat (ADAPTIVE TSTAT = YES), the unit will use adaptive control for staging. When configured for space sensor or RAT control (UNIT CONTOL TYPE) the unit will use adaptive control for staging. With either staging method there are then two supply air temperature limits, the Maximum SAT Lower Level (LOWER MAX SAT) the Maximum SAT Upper Level (UPPER MAX SAT). Any time the supply air temperature rises above lower level the heat staging will be limited to what is currently on and no additional stages will be added until the supply air temperature falls back below the lower level. If the supply air temperature rises above the upper level, then heating will be reduced by removing one stage. That stage will not be added again until the Supply Air Temperature falls below the lower level. If the supply air temperature stays above the upper level, then another stage will be removed. If the upper and lower levels 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.

Adaptive Control

Stage timers and Supply air trend apply when determining the request for stages. The first request (REQ. HEAT STAGES =1) comes immediately when starting the staging process. The Heat

Stage Increase Time (HEAT STAGEUP TIME) has to expire and the Supply--Air Trend (SUPPLY AIR TREND) has to be above the Heating supply air trend level (HEAT SATTREND LEV) before another stage can be added. Requested stages will only be allowed to increase as the actual system demand allows (DEMAND). A “LOW HEAT” will only allow one requested stage and “HIGH HEAT” 2 stages. The requested stages will be reduced if the heating demand is lowered or dropped completely, or if the supply air falls below the lower level (LOWER MIN SAT).

Traditional Thermostat Control

Stage timers and Supply air trend do not apply when determining the request for stages. Request staging will follow the thermostat inputs directly. “LOW HEAT” will request one stage. “HIGH HEAT” will request 2 stages.

Heat Relay Control

The heat relay control is responsible for energizing or de--energizing the heat s tage r elays and works hand a nd hand with the sta gi ng control. As the staging control requests stage s, 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 heat relays depends on the heat instal led, how many stages, and time guards. The Number of Heat Stages (HEA TI NG STAGE QTY) configuration tells the control how many heat relays can be used. Heat Stage 1Timeguar d

(HEAT 1 TIMEGUARD) and Heat Stage 2 Timeguard (HEAT 2 TIMEGUARD) display the time a respective heat relay has before it

can change state. The available stages at any given time are displaye d as heat 1 availabl e and heat 2 avai lable (HEAT 1 AVAILABLE and HEAT 2 AVAILABLE). The actual heat relays on at any given time are displayed as Actual Heating Stages (ACTVE HEAT STAGE). Heat Stage 1 Relay (HEA T 1 RELA Y) and Heat Stage 2 Relay (HEA T 2 RELAY) are displayed on when the respective relay is energized. There are time guards to prote ct from short cycling, Heat Minimum On Time (HEAT MIN ON) and Heat Minimum Off Time (HEAT MIN OFF) 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 (HEAT MIN ON) 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 (HEAT FANOFF DELAY) unless power is reset to the control. A light emitting diode (LED) is provided on t he IGC t o indicat e stat us. Duri ng normal operation the LED is continuously on. See the Trouble shooting 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 (HEAT 1 RELAY), 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 Flue Gas Pressure switch, the ignition activation period begins. The burners will ignite within 5 seconds . If the burners do not light, there is a 22--second delay befor e 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 rese t when the reques t for heat is temporarily removed. When ignition occurs the IGC board will continue to monitor the condition of the rollout switch, limit switches, the Flue Gas Pressure switch, as well as the flame sensor. If the unit is controlled through a room thermos tat or space sensor set for auto--fan, 45 seconds after ignition occurs the indoor--fan motor will be energized (and the outdoor--air dampers will open to thei r minimum position). If for some reason the over temper ature limit opens prior to the star t of the indoor fan blower, on the next attempt, the 45--second

delay will be shorte ned 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 heat ing will continue . Once modified, the fan on delay will not change ba ck to 45 se conds unless power is res et to the control. When the control energizes Heat Stage 2 Relay (HEAT 2 RELAY), 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.

Supply Air Tempering

Supply Air Tempering control operates the gas or electric heat to maintain a minimum supply air temperature during conditions where very cold outdoor air causes the supply air temperature to fall below the configured Supply Air Tempering Setpoint. This occurs during periods where DCV is active and increasing the amount of outdoor air or in cases where the system is operating at very low airflow and the calculated economizer position has increased to maintain a constant ventilation rate.

The user can enable/disable Supply Air Tempering. The following conditions must be true for the supply air tempering

algorithm to operate:

S The SA Tempe ring is set to Ye s (OKTOSATEMPER=YES) S The indoor fan is on S The System Mode is in Vent (Ventilation or Supply Fan Only) or

IAQ Override.

S The Outdoor Air Temperature < Minimum Cooling SAT 48_F. S Heat type is gas or electric and Number Of Heat Stages > 0

If all the above are true, the SystemVut controller will monitor the SAT sensor value and operate the first stage of heat to temper the supply air as required in order to maintain the configured SA Tempering Setpoint.

Two Position Damper Operation

The Two Position damper is used for ventilation. If the indoor fan is not on the two position damper will not open. If the two position damper is installed then ventilation method will be set to two position damper (VENT METHOD = 2POS DMPER (2)), and two position damper channel will be configured (2POS/ERV CHANNEL). When the unit is occupied and the indoor fan is running, the two position damper configured relay will energized. This then activated the motor at the damper to open to the mechanical stop position enforced at the actuator. This will provide the customer set ventilation rate determine for the space.

NOTE: If two position damper is installed with a multiple speed system, the ventilation rate will be high or low depending on the specific speed running during set up and the current speed being run for normal operation.

Economizer Operation

The Economizer is used for ventilation, and cooling. If the Indoor fan is not on, the economizer will not operate. If an economizer is installed, then Vent Method (VENT METHOD = ECON) should be set to economizer. The unit produces a 4--20mA signal which is then changed to a 2--10V signal with a 500 ohm resistor, which can control the economizer actuator. The economizer output signal is displayed by the Economizer Commanded Position (ECON CMD POSITION). The actuator’s built--in 2 to 10VDC feedback signal is read in as an analog input to know the actual position which is displayed as Economizer Actual Position (ECON ACT POSITION).

Minimum Ventilation

The economizer will open to allow ventilation when the indoor fan is turned on and the unit is in the occupied state. The economizer damper position at any given time for ventilation is displayed as the Min Position in Effect (EFFECTIVE MIN POS).This minimum position can be effected by the indoor fan speed (F.SPD) and indoor air quality. To maintain a constant airflow through the economizer, as the indoor fan speed decreases or increases the

damper minimum position will increase or decrease, respectively. This relationship curve is shown in Fig. 16.

NOTE: The software point names are used in Fig. 16 as to not clutter the graph. These points are not individually set and therefore only visible from a network for troubleshooting.

These units can also be equipped with optional CO

sensors for

additional indoor air quality control. When unit is equipped with a return duct CO

sensor the Economizer minimum position vs. fan speed curve

will be recalculated based on the CO

sensor or return duct CO2sensor and outside air

level of the return and/or

outside air as shown in Fig. 16. When performing Demand Controlled Ventilation, the damper’s Min Position in Effect (EFFECTIVE MIN POS) will operate in the shaded area of Fig. 16 based on the IAQ Level (IAQ) and the Commanded Fan Speed (IDF SPEED OUTPUT). See the Indoor Air Quality (IAQ) section for more details on Demand Controlled Ventilation (DCV).

The damper position curve can be field adjusted per application if needed.

1. Activate test mode to control the fan and dampers to achieve the correct numbers.

2. Set the fan speed for the maximum amount needed for design CFM requirements. This should also be the IDF maximum Fan speed (IDF MAXSPEED).

3. Open the damper to the position which satisfies the highest ventilation requirement running maximum fan speed, and then set the Economizer minimum at maximum fan speed (MIN POS @ MAX FAN) to this damper position.

4. Set the fan speed to a realistic operating speed in the upper range, and then set the User Minimum Position Speed 1 (MIN POS SPEED 1) equal to that speed. This should be somewhere in the 80% range.

5. Open the damper to the position which satisfies the highest ventilation requirement running speed 1 fan speed, and then set the User Minimum Position Damper Position 1 (MIN POS DAMP 1) to this damper position.

6. Set the fan speed to a realistic operating speed in the mid-range, and then set the User Minimum Position Speed 2 (MIN POS SPEED 2) equal to that speed. This should be somewhere in the 60% range.

7. Open the damper to the position which satisfies the highest ventilation requirement running speed 2 fan speed, and then set the User Minimum Position Damper Position 2 (MIN POS DAMP 2) to this damper position.

8. Set the fan speed to a realistic operating speed in the low-range, and then set the User Minimum Position Speed 3 (MIN POS SPEED 3) equal to that speed. This should be lowest fan speed in planned operating range.

9. Open the damper to the position which satisfies the highest ventilation requirement running speed 3 fan speed, and then set the User Minimum Position Damper Position 3 (MIN POS DAMP 3) to this damper position.

The shape of the curves in Fig. 16 are determined by the configuration parameters: User Minimum Position Speed 1 (MIN

POS SPEED 1), User Minimum Position Damper Position 1 (MIN POS DAMP 1), User Minimum Position Speed 2 (MIN POS SPEED 2), User Minimum Position Damper Position 2 (MIN POS DAMP 2), User Minimum Position Speed 3 (MIN POS SPEED 3), User Minimum Position Damper Position 3 (MIN POS DAMP 3), and Economizer minimum at maximum fan

speed (MIN POS @ MAX FAN). These configurations are preset at the factory of default purposes. The Economizer minimum at maximum fan speed (MIN POS @ MAX FAN) should be changed based on the air balance of the unit for proper ventilation.

The user adjustable points discussed above are defaulted to zero from the factory which forces the control to use a set of default points. The default points should not be left for permanent operation, as it may cause inadequate ventilation. Economizer minimum at maximum fan speed (MIN POS @ MAX FAN) and at least one set of user points User Minimum Position Speed 1 (MIN

POS SPEED 1) and User Minimum Position Damper Position 1 (MIN POS DAMP 1) should be used to create a linear curve to

cover the broad scope of fan operation.

Econo Max

Position

(DAMPMAX)

Damper Position

Key

(AQP_SPD3, AQP_POS3)

(AQP_SPD2, AQP_POS2)

(MP_SPD3, MP_POS3)

10%

(AQ_SPD3, AQ_POS3)

(AQ_SPD2, AQ_POS2)

Indoor Fan Speed

(MP_SPD2, MP_POS2)

(AQ_SPD1, AQ_POS1)

Fig. 16 -- Minimum Damper Position Curves

Minimum Position Curve IAQ Minimum Position Curve IAQ Purge Position Curve

(AQP_SPD1, AQP-POS1)

(MP_SPD1, MP_POS1)

Maximum Speed

(SPEEDMAX)

IAQPMAX

MINP_

IAQMINP

MAX

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Free Cooling

The economizer will be enable d for cooling (OK TO FREE COOL? =Yes)if the supply air tempe rature sensor reading is valid, there are

no applied lockouts, and economize r is operational. Ec onomizer Operational (ECON OPERATIONAL?) indicates if an economize r is installed (VENT METHOD = ECON) and feedback indicates it is operational. The three economizer lockouts tha t determi ne if free cooling should be used to help with cooling are: Dry Bulb Lockout

(DRY BULB LOCKOUT), Enthalpy Lockout (ENTHALPY LOCKOUT), and Unoccupied Free Cooling Lockout (UFC LOCKOUT?). Any one of these lockouts will disable economizer free

cooling. See below for how each lockout occurs .

When the economi zer is avail able for free cooling (OK TO FREE COOL? = Yes ) and the compres sion is not on, the damper will start opening from the damper’s minimum Position in Effect

(EFFECTIVE MIN POS) based on the supply air tem perature (SUPPLY AIR TEMP) to provide free cooling. A low cooli ng

demand (DEMAND = LOW COOL) will utilize the Low Free Cooling SAT Setpoi nt (LOW COOL SAT SP) as the Free Cooling Setpoint (FREECOOL SA T SP) to control the economizer. A medium or high cooling demand (DEMAND = HIGH COOL) will utilize the High Free Cooling SA T Setpoint (HIGH COOL SAT SP) as the Free Cooling Setpoint (FREECOOL SAT SP) to control the economi zer .

During free cooling the fan will start at the dedicated free cooling speed (FREE COOL IDF SPD). After the economizer (ECON CMD POSITION) reaches 100% (or Max) for 5 minutes, the fan will be changed to the High Cool Speed (HIGH COOL IDF SPD). When a high cooling demand (DEMAND = HIGH COOL) is active the control will use the High Cool Speed (HIGH COOL IDF SPD). The compressor will be allowed for use after the fan and economizer are 100% (or Max) for 5 minutes. Once compression is turned on the economizer and fan will remain at 100% until the call for cooling is removed or until the unit is no longer allowed to free cool (OK TO FREE COOL = No).

Dry Bulb Lockout

Dry Bulb Lockout (DRY BULB LOCKOUT) occurs when any of the following are true:

S The Outdoor Air Tempe rature (OUTDOOR AIR TEMP) is invalid. S When Differential Dry Bulb Control is disabled (DIFF DRY

BULB CTL = Disable) and the Outdoor Air Temperature (OUTDOOR AIR TEMP) is greater than the configured Free Cooling Maximum Temperature (FREE COOL MAX OAT) or less than the configured Free Cooling Minimum Temperature (FREE COOL MIN OAT).

S When Differential Dry Bulb Control is enabled (DIFF DRY

BULB CTL = Enable) and the return air temperature (RETURN AIR TEMP) plus the Differential Dry Bulb deadband (DIFF DB DEADBAND) is lower than the outdoor air temperature (OUTDOOR AIR TEMP).

Enthalpy Lockout

The control uses the Outdoor Air Temperature (OUTDOOR AIR TEMP), Outdoor Relative Humidity (OARH LEVEL),and

Barometric Pressure (BAROMETRIC PRESS) to calculate the Outdoor Enthalpy (OUTDOOR ENTHALPY). The control uses the Return Air Temperature (RETURN AIR TEMP),Return Relative Humidity (RARH LEVEL), and Barometric Pressure

(BAROMETRIC PRESS) to calculate the Return Enthalpy (RETURN ENTHALPY). Enthalpy Lockout (ENTHALPY LOCKOUT) occurs when any of the following are true:

S When Differential Enthalpy Control is disabled (DIFF

ENTHALPY CTL = Disable) and the outdoor enthalpy (OUTDOOR ENTHALPY) is greater than the Maximum Outdoor Enthalpy limit (ENTHALPY HI LIMIT).

S When Differential Dry Bulb Control is enabled (DIFF DRY BULB

CTL = Enable) and the outdoor enthal py (OUTDOOR

ENTHALPY) is greater than the return enthalpy (RETURN ENTHALPY). The Differential Enthalpy deadband (ENTHALPY DEADBAND) is use in the case of unlocking the Enthalpy lockout (ENTHALPY LOCKOUT).

S The Enthalpy switch input (ENTHALPY SWITCH) is reading

high.

Unoccupied Free Cooling Lockout

Unoccupied Free Cooling lockout (UFC LOCKOUT?) occurs when the unit is in the unoccupie d period (OCCUPIED NOW? = No) and the Outdoor Air Tem perature (OUTDOOR AIR TEMP) is less than the Unoccupied Free Cooling low tempe r ature (UFC LOW TEMP).

Unoccupied Free Cooling

The unoccupied free cooling algorithm attempts to maintain the building space half way betwee n the Occupied Cool Set Point (OCC

COOL SETPOINT) and Occupied Heat Set Point (OCC HEAT SETPOINT) using only the economizer when the conditions in the

building and the outdoors are suitable , during unoc cupied periods. Three different points define this algorit hm : Unoccupied Free Cooling configuration (WHEN TO UNOCC FC), Free Cooling Preoccupancy Time configur a tion (UFC PREOCC TIME), and Free cooling allowed

(OK TO FREE COOL?).

WHEN TO UNOCC FC = 0(Disabled)

Free Cooling will only occur if the space exceeds the unoccupied setpoints.

WHEN TO UNOCC FC = 1 (Preoccupancy)

Unoccupied free cooling can only occur when the time until the next occupied period is less than the Unoccupied Free Cool Pre--Occupancy Time (UFC PREOCC TIME) in minutes.

WHEN TO UNOCC FC = 2 (Unoccupied)

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.

Power Exhaust

Power Exhaust is a function used to assist in the building exhaust air if the barometric relief damper is not enough. It can be one or two motors which can be controlled independently to provide 2 stages of exhaust. These two power exhaust stages are controlled by relays on the Main Base board, and therefore need to be configured on relay channels. To assign the channels set the PE1 RELAY CHANNEL and PE2 RELAY CHANNEL as needed.

NOTE: Factory installed power exhaust is only one channel and is on Relay 06.

When a power exhaust 1 relay channel is configured, the control will create a PE1 curve, example shown in Fig. 17. This curve is created by applying the difference of the power exhaust stage 1 at maximum fan speed (PE1 POS @ MAX SPD) and the Economizer minimum at maximum fan speed (MIN POS @ MAX FAN) in relationship to the minimum position curve. When a power exhaust 2 relay channel is configured, the control will create a PE2 curve, example shown in Fig. 17. This curve is created by applying the difference of the power exhaust stage 2 at maximum fan speed (PE2 POS @ MAX SPD) and the Economizer minimum at maximum fan speed (MIN POS @ MAX FAN) in relationship to the minimum position curve.

Power exhaust 1 (PE1 RELAY) and power exhaust 2 (PE2 RELAY) are controlled using their respective curves as a threshold. When the operating point of the Commanded Fan Speed (IDF

SPEED OUTPUT) and Economizer Commanded Position (ECON CMD POSITION) is above the power exhaust 1 curve,

the Power exhaust 1 (PE1 RELAY) will be turned on. When the operating point falls below the curve minus the power exhaust turn off deadband (PE OFF DEADBAND) the Power exhaust 1 (PE1 RELAY) will be turned off. Power exhaust 2 operates the same as Power exhaust 1 except using the PE2 curve.

Econo Max

Position

(DAMPMAX)

(PE2_SPD3, PE2_POS3)

Key:

Minimum Position Curve Power Exhaust 1Curve Power Exhaust 2 Curve

Damper Position

10%

2(PE2_SPD2,

(PE1_SPD3, PE1_POS3)

(MP_SPD3, MP_POS3)

PE2_POS2)

(PE1_SPD2, PE1_POS2)

(MP_SPD2, MP_POS2)

Indoor Fan Speed

Fig. 17 -- Power Exhaust Operation Curves

(PE2_SPD1, PE2_POS1)

PE2PMAX

(PE1_SPD1, PE1_POS1)

PE1PMAX

(MP_SPD1, MP_POS1)

MINP_MAX

Maximum Speed

(SPEEDMAX)

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Indoor Air Quality (IAQ)

Indoor air quality is typically measured using a CO2sensor whose measurements are displayed in parts per million (ppm). Outdoor air quality may be measured with a CO differential demand ventilation control. The factory--installed indoor air quality CO

sensor is mounted in the return section. A

field--installed indoor air quality CO the return or in the occupied space. The indoor air quality modes of operation can be affected by the IAQ Analog Input Config (ANALOG IAQ CTRL) and other related and limit configurations as described below.

IAQ (Analog Input)

When IAQ assigned channel (IAQ SENSOR CHAN) is set for an analog input that input channel will be mapped to the Indoor Air Quality (IAQ LEVEL). The control is configured for indoor air quality sensors which provide 4 to 20 mA signal for 0 to 2000 ppm

. If the sensor being used has a different range, the ppm

display range must be reconfigured by entering new values for the IAQ Sensor Value at 4mA (IAQ PPM @ 4MA) and IAQ Sensor Value at 20mA (IAQ PPM @ 20MA).

ANALOG IAQ CTRL =0(NoIAQ)

This signifies that there is no IAQ sensor installed. The economizer damper will operate based on the minimum position curve.

ANALOG IAQ CTRL = 1 (DCV)

During Demand Controlled Ventilation (DCV), the damper modulates on or between two ventilation curves depending upon the difference between the Indoor Air Quality (IAQ LEVEL) and the Outdoor Air Quality (OAQ LEVEL). The lower of these two curves is referred to as the IAQ Minimum Position Curve, and the higher curve is the Minimum Position curve discussed in the Minimum Ventilation section under Economizer Operation. Refer

sensor for indoor--outdoor

sensor may be mounted in

to that section on how the minimum Position curve is created. See Example Curves in Fig 16.

The IAQ Minimum Position curve is created by applying the difference of the IAQ position at maximum fan speed (IAQ POS @

MAX SPD) and the Economizer minimum at maximum fan speed (MIN POS @ MAX FAN) in relationship to the minimum position curve. The IAQ position at maximum fan speed (IAQ POS @ MAX SPD) should be set to an economizer position that brings in

enough fresh air to remove contaminates and CO

generated by

sources other than people. The Economizer minimum at maximum fan speed (MIN POS @ MAX FAN) should be set to an economizer position that brings in fresh air to remove contaminates and CO

generated by all sources including people when the

indoor fan is operating at the IDF Maximum Fan Speed (MAXIMUM IDF SPEED). The Economizer minimum at maximum fan speed (MIN POS @ MAX FAN) value is the design value for maximum occupancy.

The economizer Min Position in Effect (EFFECTIVE MIN POS) will follow the IAQ Minimum Position curve while the Indoor Air Quality level (IAQ LEVEL) is less than the Outdoor Air Quality Level (OAQ LEVEL). The control will begin to open the damper more than the IAQ Minimum Position curve when the IAQ level begins to exceed the OAQ level by a configurable amount. This amount is referred to as AQ Differential Low (LOW AIR.Q DIFF). When the differential between IAQ and OAQ reaches AQ Differential High (HIGH AIR.Q DIFF), the economizer Min Position in Effect (EFFECTIVE MIN POS) will follow the Minimum Position Curve. When the IAQ/OAQ differential is between AQ Differential Low (LOW AIR.Q DIFF) and AQ Differential High (HIGH AIR.Q DIFF), the control will modulate the damper between the IAQ Minimum Position Curve and the Minimum Position Curve in a linear manner as shown as the shaded area in Fig. 16. As a simple example Fig. 18 shows the Min

Position in Effect (EFFECTIVE MIN POS) relationship while the Commanded Fan Speed (ECON CMD POSITION) is held at the maximum speed.

ANALOG IAQ CTRL = 2 (Override IAQ)

Override IAQ is reserved for a future release.

ANALOG IAQ CTRL = 3 (Control Minimum Position)

An external 4 to 20 mA source is used to set the Min Position in Effect (EFFECTIVE MIN POS). The 4mA signal corresponds to 0% and the 20 mA signal corresponds to 100%. In this mode, configuration such as Economizer minimum at maximum fan speed (MIN POS @ MAX FAN), IAQ position at maximum fan speed (IAQ POS @ MAX SPD) and the economizer minimum position and DCV minimum position curves in Fig. 16 and Fig. 18 are not used. If the indoor fan is not operating, the economizer position will be zero. The actual damper position may exceed the economizer Min Position in Effect (EFFECTIVE MIN POS) to provide economizer cooling.

MIN POS @

MAX FAN

VENTILATION FOR PEOPLE

IAQ POS @

MAX FAN

INCREASING VENTILATION

VENTILATION FOR SOURCES

100 700 INSIDE/OUTSIDE CO

LOW AIR.Q DIFF HIGH AIR.Q FIFF

DIFFERENTIAL

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Fig. 18 -- Example

Outdoor Air Quality (Analog Input)

The default for the Outdoor Air Quality (OAQ LEVEL) is 400 ppm CO

when the OAQ sensor is not assigned an input channel.

When OAQ Assigned channel (OAQ SENSOR CHAN) is set for an analog input that input channel will be mapped to the Outdoor Air Quality (OAQ LEVEL). The outdoor air quality sensor provides a 4 to 20 mA signal corresponding to 0 to 2000 ppm

. If a field supplied sensor has a different range, the ppm

display range must be reconfigured by entering new values for the OAQ Sensor Value at 4mA (OAQ PPM @ 4MA) and OAQ Sensor Value at 20mA (OAQ PPM @ 20MA).

Pre--occupancy Purge

The control has the option for a pre--occupancy purge to refresh the air in the space prior to occupancy. This feature is enabled by setting PREOCC PURGE ENBL to Yes. This function is also referred to as the IAQ purge function.

The IAQ Purge will operate under the following conditions:

S Purge is enabled S the unit is in the unoccupied state S Current Time is valid S Next Occupied Time is valid S time is one hour prior to next occupied period S the OAT is greater than the lockout (PREOCC LOW LIMIT)

The IAQ Purge Position curve is created by applying the difference of the IAQ purge position at maximum fan speed (PURGE POS @

MAX) and the Economizer minimum at maximum fan speed (MIN POS @ MAX FAN) in relationship to the minimum position curve. The IAQ purge position at maximum fan speed (PURGE POS @ MAX) should be set to an economizer position that brings in

enough fresh air over an hour period to remove contaminates and

during the unoccupied period. When the preoccupancy purge

function is active (IN PREOCC PURGE?), the economizer Min Position in Effect (EFFECTIVE MIN POS) will follow the IAQ Purge Position curve.

Temperature Compensated Start

Space control set points are usually set to 2 different levels for unoccupied period and occupied period. Unoccupied set points saves energy, while occupied set points provide occupant comfort. The time period it takes for the RTU to bring the space from its current condition in unoccupied mode to its occupied set point is referred to as start bias time, or bias time. The algorithm to calculate this bias time is called Temperature Compensated Start. This is required for ASHRAE 90.1 compliance. When temperature compensated start is running (TCS ACTIVE?) the control uses the occupied set points to control the space.

When Temperature compensated start is enabled (ADAPTIVE TCS?), no other configuration parameters are needed for this algorithm, because the algorithm will automatically adjust the Bias Time based on the data collected during the period of last time optimal start. The inputs to the calculation algorithm includes space temperature, unoccupied set points, occupied set points, outdoor air temperature, and supply air temperature. Bias time is changed dynamically per RTU operation.

When Temperature compensated start is disabled (ADAPTIVE TCS?), the control will use the User Temperature compensated Start bias time (USER TCS BIASTIME) in determining when to start controlling to the occupied set points. If the User Temperature compensated Start bias time (USER TCS BIASTIME) is set to zero, the control will switch to the occupied setpoints at the time of occupancy.

Linkage

The SystemVut controller will support 3Vt, VAV an d V V T zoning system on a CCN system or Open VVT and VAV systems on a BACnet MS/TP System. All that is required is to configure the Open or 3V Master zone to use the SystemVu rooftop unit as its airsource. The SystemVu control will need to be configured for the proper network protocol (BAS PROTOCOL) and set for Space Sensor Control (UNIT CTRL TYPE). The SystemVu controller will reply to the zoning system and change its operating parameters to meet the demand of the zoning system. Status of this process can be viewed in the airside linkage tab of the property pages in the

application or by viewing the linkage maintenance table

i-- Vu with a CCN tool.

Carrier Comfort NetworkR(CCN) Operation

The SystemVu controller can be configured to connect to a CCN system. The SystemVu controller h as one RS --485 BMS port that can be configured from the local display for BACnet or CCN. The BMS configuration parameters can be found in the SETTINGSNETWORK SETTINGS submenu. The first configuration is the BMS system for CCN systems change this configuration from BACnet to CCN then set the CCN BAUD rate, the bus and element number and you will be able to find the controller with any CCN tool then upload the CCN tables in the controller for use by the tool.

BACnet Network Operation

The SystemVut controller is ready to connect to BACnet. The SystemVu control l er has one RS--485 BMS port that can be configur ed from the local display for BACnet or CCN. The defa ult setting is BACnet and the Default BACnet Baud rate is 76800. These settings are found on the SETTINGSNETWORK SETTINGS sub menu of the local displ ay. There are four other settings for i--Vu

compatibility and for setting the device ID and MAC address of the control ler . See the table below for assistance.

Before connecting to the BACnet system determine the system requirements and use the following guide to configure the BACnet settings. Then power the controller down, connect to the BACnet MS/TP network and you are ready to discover your controller.

For i--Vu

systems with auto addressing desired the controller is already set with the defaults from the factory ready to connect to this type of system; just set the MAC address of the controller from 0 to 99 and then power down and connect to the network. The router will find and send the network number to the controller and the controller will set it device ID with the network base appended by the Mac address.

For i--Vu and other BACnet systems when it is required to send the device ID to the controller change the ALC/i--Vu auto ID scheme to no and set the MAC address from 0 to 99 like before. Then connect to the network and write the device ID to the controller at the MAC address you set. The controller will accept and retain the device ID written to the device Id property of the object ID.

T o manuall y set the device ID from the local displa y set the BACnet auto/manual to manual. This allows use of the full range of 1 to 127 for t he MAC address and s et the device ID in the BACnet ID selection of the local display. It can only be set from the local display and will not accept a write to the device ID property in the object ID.

BACnet ID Auto/Manual

Manual ON or OFF

Auto OFF

Auto ON

i --- V u A u t o

Scheme

How Device is derived

Local display BACnet Id -- -BACNet Writes not allowed

Device Id Prefix + Mac --- BACnet writes allowed

Device Id Prefix + MAC (prefix updated by color cache) --- BACnet writes not allowed

MAC range

0 --- 1 2 7

0 --- 9 9

Alarm Handling

There are a variety of different alerts and faults in the system, the term alarm is used to reference alerts and faults. Alerts are indicated by AXXX (where XXX is the alert number) on the display and generally signify a warning of some sort or the improperly functioning circuit can resta rt without human interaction. If an fault occurs, indicated by FXXX (where XXX is the fault number), a major functi on of the unit is inoperable or the damaged circuit will generally not restart without an alarm reset via the display or CCN.

The response of the control system to various alerts and faults depends on the seriousness of the particular alert or fault. In the mildest case, an alert does not affect the opera t ion of the unit in any manner. An alert can also cause a “strike.” A “striking” alert will cause the circuit to shut down for 15 minutes. This feat ur e reduce s the likelihood of false alarms caus i ng a properly working system to be shut down incorr ectly. If three stri kes occur before the circuit has an opportunit y to show that it can function properly, the circuit will strike out, causing the shutdown fault for that particular circ uit. Once activated, the shutdown fault can only be cleared via an alarm reset.

However, circuits with strike s will be given an opportunity to rese t their str ike counter to ze ro. As discussed above, a strike typically causes the circuit to shut down. Fifteen minutes later, that circuit will once again be allowe d to run. If the “troubl ed” circuit runs continuously for a user defined time (SETTINGSUNIT CONFIGURATI ONSCOOLINGSTRI KE CLEAR TIME) with no detect able problems the strike counter will be reset to zero. Default value is 5 minutes.

Alarm Relay Output

The alarm relay output is a configurable normally open 24--VAC output defaulted to relay 11 on the Main Base Board (MBB) TB2 connector. Selection of which alerts and faults will result in closing of the alarm relay may be set in the Alarm Relay Configuration (SETTINGSUNIT CONFIGURATIONSALARM RELAY).

Setting a configuration to YES will result in the alarm output relay to energize when that particular condition is in an alarm state. Setting a configuration to NO will result in no action by the alarm output relay for that particular condition.

NOTE: An accessory filter switch can be used along with the alarm relay output function to indicate dirty filter service need. See the Troubleshooting section for more information on viewing, diagnosing, and clearing alerts and alarms.

TROUBLESHOOTING

The SystemVut display shows actual operat ing conditions of the unit while it is running. If there are alarms or there have been alarms, they will be displayed in either the active faults, active alerts, or the history alarm list (see Table 12 starting on page 32 ). Service Test mode allows proper operation of the compres sors, fans, and other components to be checked while the unit is not opera t ing. See Service Test (on page 10).

Complete Unit Stoppage

There are several conditions that can cause a complete unit stoppage, including:

S A fault is active which causes the unit to shut down. S Cooling and heating loads are satisfied. S Programmed occupancy schedule. S General power failure. S Tripped 24-volt transformer circuit breakers. S Blown fuse or circuit breakers S Unit is turned off through the network.

Restart Procedure

Before attempting to restart the machine, check the faults and alerts list to determine the cause of the shut down. If the shutdown fault for a particular control function has occurred, determine and correct the cause before allowing the unit to run under its own control again. When there is problem, the unit should be diagnosed in Service Test mode. The faults must be reset before the control function can operate in either Normal mode or Service Test mode.

Faults and Alerts

Viewing and Clearing Unit Alarms

Presence of active alarms will be indicated on the SystemVu display by the Alarm Status lights. When alerts are active the yellow “ALERT” light will be lit. When faults are active the red “FAUL T” light will be lit. When the unit is operational, then green “RUN” light will be lit. The SystemVu controller standby screen will be updated with the active alarms for easy access. Presence of active alarms may also be signaled on the Alarm Output terminals. Each alarm may also be broadcast on the CCN network. Active ala rms and past ala rm history can be reviewed and cleared via the local display or a network device. The following menu locations are used for the local display:

ACTIVE FAULTS -- Displays the list of active faults in order of occurrence.

ACTIVE ALERTS -- Displays the list of active alerts in order of occurrence.

HISTORY -- Displays the list of active and previously active faults and alerts in order of occurrence with time and date.

RESET FAULTS/ALERTS --User command to manually reset faults and alerts.

Each alarm can have up to 3 data points stamped along with date and time to assist in troubleshooting. Pressing ENTER on the alarm or expanded screen will provide these data points.

Diagnostic Alarm Codes and Possible Causes

Fault F010 – MBB LOW VOLTAGE

This fault occurs when the MBB supply voltages falls below 17 volts AC. When this occurs the control will shut down the unit. This will automatically clear when the supply voltage rises above 19 volts AC. The cause of this fault is usually a brownout condition, low supply voltage, or supply power missing a phase.

Fault F011 – MBB REFERENCE VOLTAGE

This fault occurs when the MBB internal microprocessor’s DC reference voltages is out of range. When this occurs the control will shut down the unit. This will automatically clear when the DC reference voltage goes back in range. The cause of this fault is usually a MBB failure or supply voltage out of range.

Alert A012 – MBB ZERO CROSSING

This fault occurs when the MBB supply voltage frequency is out of range. When this occurs the control will issue an alert. This will automatically clear when the supply voltage goes back in range. The cause of this fault is usually a MBB failure or supply voltage frequencytohighortolow.

Fault F013 – MBB FUSE 2 OPEN

This fault occurs when the MBB’s internal fuse number 2 exceeds threshold temperature. When this occurs the control will shut down the unit. This will automatically clear when the fuse temperature gets back in range. The cause of this fault is usually a switch input has a wiring error (short) or the switch pulled too much current. Discrete input number 2, Fire Shutdown input, and the IGC fan request are connected to fuse 2.

Fault F014 – MBB FUSE 3 OPEN

This fault occurs when the MBB’s internal fuse number 3 exceeds threshold temperature. When this occurs the control will shut down the unit. This will automatically clear when the fuse temperature gets back in range. The cause of this fault is usually a switch input has a wiring error (short) or the switch pulled too much current. Configurable discrete input numbers 12, 13, and 14 are connected to fuse 3.

Alert A015 – MBB RNET VOLTAGE RANGE

This fault occurs when the MBB’s Rnet 12 volt output is out of range. When this occurs the control will issue an alert, and any accessory connected to the Rnet plug may not operate properly. This will automatically clear when the voltage goes back in range. The cause of this fault is usually a MBB failure or supply voltage out of range.

Alert A016 – MBB 24VDC RANGE

This fault occurs when the MBB’s 24vdc output falls below 17 volts DC. When this occurs the control will put the Analog Input number’s 6, 7, and 8 into error state. This will automatically clear when the voltage rises above 19 volts DC. The cause of this fault is usually a MBB failure or supply voltage out of range.

Alert A017 – MBB 5VDC RANGE

This fault occurs when the MBB’s 5vdc output falls below 4.5 volts DC. When this occurs the control will put the Transducer inputs into error state. This will automatically clear when the voltage rises above 4.5 volts DC. The cause of this fault is usually a MBB failure or supply voltage out of range.

Fault F018 – MBB EEPROM FAILURE

The unit will completely shut down. The serial EEPROM chip on the MBB which stores the unit’s configuration is not responding. Recovery is automatic but MBB board replacement may be necessary. Cycling the power to the control should be tried before board replacement.

Alert A019 – MBB CLOCK FAILURE

The alert occurs when the RTC clock chip on the MBB is not responding. Time and date functions will not operate, such as local occupancy schedules. The unit will default to 24/7 unoccupied mode. Recovery is automatic but MBB board replacement may be necessary. Cycling power to the control and reconfiguring the time and date should be tried before board replacement.

Fault F020 – SOFTWARE ERROR

The unit will completely shut down. The software on the MBB is not responding. Recovery is automatic if the software is able to reset the board but software change may be necessary. Cycling the power to the control should be tried before board replacement.

Alert A100 – SAT SENSOR FAILURE

This alert occurs when the fan supply temperature sensor is in an error state. Economizer cooling cannot occur while this alert is active. The unit will not be able to honor SAT limits. This alert resets automatically. The cause of the alert is usually a faulty thermistor, a shorted or open thermistor caused by a wiring error, or a loose connection.

Alert A101 – FST SENSOR RANGE

This alert occurs when the fan supply temperature sensor is outside the range –40_F to 245_F (–40_Cto116_C). This alert resets automatically. The cause of the alert is usually a faulty thermistor, a shorted or open thermistor caused by a wiring error, or a loose connection.

Alert A102 – FST OPEN SENSOR

This alert occurs when the fan supply temperature sensor reads as an open circuit. This alert resets automatically. The cause of the alert is usually a faulty thermistor or an open thermistor caused by a wiring error, or a loose connection.

Alert A103 – FST SHORTED SENSOR

This alert occurs when the fan supply temperature sensor reads as a short circuit. This alert resets automatically. The cause of the alert is usually a faulty thermistor or a shorted thermistor caused by a wiring error, or a loose connection.

Alert A104 – OAT SENSOR RANGE

This alert occurs when the outdoor air temperature is outside the range –40_F to 245_F (–40

_Cto116_C). All ambient temperature

lockout limits for cooling and heating are ignored. All cooling control logic will assume OAT is high. For economizer equipped units, the economizer will not operate to provide cooling. The economizer will still operate for ventilation. The control will use normal operation for outdoor fan control. For units with CCH crankcase heat relay control, the crankcase heat relay will be turned on if any compressor is off. This alert resets automatically. The cause of the alert is usually a faulty thermistor, a shorted or open thermistor caused by a wiring error, or a loose connection.

Alert A105 – OAT OPEN SENSOR

See Alert A104

Alert A106 – OAT SHORTED SENSOR

See Alert A104

Alert A107 -- RAT SENSOR RANGE

This alert occurs when the return air temperature is outside the range –40_F to 245_F (–40_Cto116_C). Differential dry bulb crossover control can not occur. Free cooling can only be controlled by the OAT and enthalpy switch. The economizer mechanically disconnected alert will not be diagnosed. This alert resets automatically. The cause of the alert is usually a faulty thermistor, a shorted or open thermistor caused by a wiring error, or a loose connection.

Alert A108 – RAT OPEN SENSOR

See Alert A107

Alert A109 – RAT SHORTED SENSOR

See Alert A107

Alert A110 – SPT SENSOR RANGE

This alert occurs when the temperature is outside the range –40_F to 245_F (–40_Cto116_C). Cooling and heating will not operate. For economizer equipped units, the economizer will still operate for ventilation. This alert resets automatically. The cause of the alert is usually a faulty thermistor in the T--55, T--56, or T--58 device, a shorted or open thermistor caused by a wiring error, or a loose connection.

Alert A111 – SPT OPEN SENSOR

See Alert A110

Alert A112 – SPT SHORTED SENSOR

See Alert A110

Alert A130 – CIR.A SSP SENSOR RANGE

This alert occurs when the pressure is outside the range --6.7 to 420 psig. A circuit cannot run when this alert is active. The cause of the alert is usually a faulty transducer, faulty 5--v power supply, or a loose connection. Use the transducer voltage drop table to determine where the error is introduced.

Alert A131 – CIR.A SSP OPEN SENSOR

See Alert A130

Alert A132 – CIR.A SSP SHORT SENSOR

See Alert A130

Alert A133 – CIR.A SDP SENSOR RANGE

This alert occurs when the pressure is outside the range 14.5 to 667 psig. A circuit cannot run when this alert is active. The cause of the alert is usually a faulty transducer, faulty 5--v power supply, or a loose connection. Use the transducer voltage drop table to determine where the error is introduced.

Alert A134 – CIR.A SDP OPEN SENSOR

See Alert A133

Alert A135 – CIR.A SDP SHORT SENSOR

See Alert A133

Alert 150 -- OACFM OPEN SENSOR

This alert occurs when the Outdoor Air CFM sensor input is 0 mA and the sensor is configured and installed. Check sensor and wiring. This alert clears automatically.

Alert 151 -- OACFM SHORTED SENSOR

This alert occurs when the Outdoor Air CFM sensor input shorted and the sensor is configured as installed. Check sensor and wiring. This alert clears automatically.

Alert A160 – OARH OPEN SENSOR

This alert occurs when the Outdoor Air Relative Humidity sensor input is 0 mA and the sensor is configured as installed. Outside Air Enthalpy cannot be calculated therefore no enthalpy crossover can be used and only dry bulb will be used in determining free cooling. Check sensor and wiring. This alert clears automatically.

Alert A161 – OARH SHORTED SENSOR

This alert occurs when the Outdoor Air Relative Humidity sensor input shorted and the sensor is configured as installed. Outside Air Enthalpy cannot be calculated therefore no enthalpy crossover can be used and only dry bulb will be used in determining free cooling. Check sensor and wiring. This alert clears automatically.

Alert A162 – RARH OPEN SENSOR

This alert occurs when the Return Air Relative Humidity sensor input is 0 mA and the sensor is configured as installed. Return Air Enthalpy cannot be calculated therefore no differential enthalpy crossover can be used. Dry bulb and single enthalpy will be used in determining free cooling. Check sensor and wiring. This alert clears automatically.

Alert A163 – RARH SHORTED SENSOR

This alert occurs when the Return Air Relative Humidity sensor input shorted and the sensor is configured as installed. Return Air Enthalpy cannot be calculated therefore no differential enthalpy crossover can be used. Dry bulb and single enthalpy will be used in determining free cooling. Check sensor and wiring. This alert clears automatically.

Alert A164 -- IAQ OPEN SENSOR

This alert occurs when the IAQ input is 0 mA and the sensor is configured as installed. IAQ operation will be disabled. Check sensor and wiring. This alert clears automatically.

Alert A165 -- IAQ SHORTED SENSOR

This alert occurs when the IAQ input is shorted and the sensor is configured as installed. IAQ operation will be disabled. Check sensor and wiring. This alert clears automatically.

Alert A166 -- OAQ OPEN SENSOR

This alert occurs when the OAQ input is 0 mA and the sensor is configured as installed. OAQ operation will be disabled. Check sensor and wiring. This alert clears automatically.

Alert A167 -- OAQ SHORTED SENSOR

This alert occurs when the OAQ input is shorted and the sensor is configured as installed. OAQ operation will be disabled. Check sensor and wiring. This alert clears automatically.

Alert A168 -- SPACE RELATI VE HUMIDITY OPEN SENSOR

This alert occurs when the SPRH input is 0 mA and the sensor is configured as installed. Check sensor and wiring. This alert clears automatically.

Alert A169 -- SPACE HUMIDITY SHORTED SENSOR

This alert occurs when the SPRH input is shorted and the sensor is configured as installed. Check sensor and wiring. This alert clears automatically.

Alert A170 – ECON FEEDBACK RANGE

This alert occurs when the Economizer analog feedback signal is outside the range of 1.3vdc to 10.3vdc and the feedback is configured to use. A short is 10.5vdc and an open circuit is less than 0.1vdc. Economizer diagnostics operation will be disabled. This is usually caused by a wiring problem, actuator failure, or the wrong actuator. Investigate using the Low Voltage Schematic; make sure the feedback signal from the actuator is correct. This alert clears automatically.

Alert A171 – ECON FEEDBACK OPEN

See Alert A170

Alert A172 – ECON FEEDBACK SHORTED

See Alert A170

Alert A190 – TSTAT HEAT/COOL CALLS

This alert occurs in Thermostat mode when Y1 or Y2 is energized simultaneously with W1 or W2. Verify thermostat and thermostat wiring. The software will enter either the cooling or heating mode depending upon which input turned on first. This alert resets automatically when Y1 and Y2 are not on simultaneously with W1 and W2.

Alert A191 – TSTAT IMPROPER COOL

This alert occurs in Thermostat mode when Y2 or Y3 is energized and Y1 is not. Verify thermostat and thermostat wiring. When this occurs the control will treat the inputs as a number instead of specific input. Example a Y2 and Y3 would mean 2 cooling inputs so the control would treat that as is a Y1 and Y2 was active. This alert resets automatically when Y1 is turned On.

Alert A192 – TSTAT IMPROPER HEAT

This alert occurs in Thermostat mode when W2 is energized and W1 is not. Verify thermostat and thermostat wiring. When W2 turns On, the software will behave as if W1 and W2 are both On. When W2 turns Off, the software will behave as if W1 and W2 are both Off. This alert resets automatically when W1 is turned On.

Fault F200 – FIRE SHUTDOWN

This fault occurs when the fire shutdown input is either open or closed depending upon its configuration. This fault is usually caused by an auxiliary device that is trying to shut down the unit, e.g., smoke detector. This will cause a unit shutdown condition. Verify that the configuration is set correct, verify the wiring and auxiliary device. This fault resets automatically.

Fault F201 – CONDENSATE OVERFLOW

This fault occurs when the COFS input is either open or closed depending upon its configuration. This fault is usually caused by water reaching a high level in the drain pan. This will cause a cooling lockout. Verify that the configuration is set correct, verify the wiring and auxiliary device. This fault resets automatically.

Alert A203 – DIRTY FILTER

This alert occurs when the Filter Status switch senses a plugged filter for 5 continuous seconds after the indoor fan has been running for 10 seconds or if the fan has run for longer than the change filter time. Because the Dirty Air Filter switch can be configured normally opened or closed, the switch might be open or closed. Verify that the configurations are set correct, verify the wiring and filter status switch. The hose should be connected to the low side of the switch. The alert resets automatically if it was tripped due to the filter switch. If the alert is tripped because of the timer, it will need to be reset after the filter has been replaced or inspected. Rest the time with the RESET FILTER TIME point is located under RUN STATUS  GENERAL or INPUTS  GENERAL INPUTS.

Fault F204 – REMOTE SHUTDOWN

This fault occurs when the remote shutdown input is either open or closed depending upon its configuration and configured to set a fault. This fault is usually caused by an auxiliary emergency device that is trying to shut down the unit. This will cause a unit shutdown condition. Verify that the configuration is set correct, verify the wiring and auxiliary device. This fault resets automatically.

Fault F205 – IDF MANUAL LIMIT TRIP

This fault occurs when the indoor fan limit switch input is lost. The switch is a manual rest limit that is normally closed. This fault is usually caused by excess heat seen at the indoor fan. This fault will cause a unit shutdown condition. Since the switch is manual reset the button on the switch will have to be reset before reseting this fault in the software.

Fault F206 – PHASE MONITOR TRIP

This fault occurs when the phase monitor input is either open or closed depending upon its configuration. This fault is usually caused by loss of phase or improper phasing of a 3 phase power supply. This will cause a unit shutdown condition. Verify that the configuration is set correct, verify the wiring and supply power. This fault resets automatically.

Alert A210 – GENERAL STATUS

This alert occurs when the general status input is either open or closed depending upon its configuration and configured to set a alert. This alert is usually caused by an auxiliary switch device that is trying to send a warning about the unit. Verify that the configuration is set correct, verify the wiring and auxiliary device. This alert resets automatically.

Fault F211 – GENERAL STATUS

This fault occurs when the general status input is either open or closed depending upon its configuration and configured to set a fault. This fault is usually caused by an auxiliary switch device that is trying to shut down the unit. This will cause a unit shutdown condition. Verify that the configuration is set correct, verify the wiring and auxiliary device. This fault resets automatically.

Fault F310 – CIRA DOWN DUE TO FAIL

This fault occurs when both compressors on circuit A have 3 strikes. Investigate the alerts that caused the strikes to occur, and correct or test as needed. Manual alarm reset or power cycle is required to rest this fault.

Fault F311 – CIRA LOW CHARGE

This alert occurs when the compressors are off and both the discharge and suction pressure are less than the low charge level (LOW CHARGE LEVEL) and OAT is greater than the low charge limit (NO LOW CHARGE OAT). The cause of the alert is usually low refrigerant pressure or faulty pressure transducers. This alert only occurs when the compressor is OFF because the low refrigerant pressure alert will handle this situation when the compressor is operating. Manual alarm reset or power cycle is required to rest this fault.

Alert A312 – CIR.A UNEXPECTED OFF

These alerts occur when the suction pressure raises the configured amount and the pressure ratio drop the configured amount both in a 10 second window during compressor operation. When this occurs, the control turns off the compressors and logs a strike for which compressor that was on. This alerts reset automatically. The possible causes are: high --pressure switch (HPS) open (the HPS is wired in series with compressor relays on the MBB), compressor internal protection is open, or a wiring error (a wiring error might not allow the compressor to start).

Alert A313 – CIR.A HIGH DISCHARGE

This alert occurs when the discharge pressure is greater than the configured CIR.A SDP LIMIT amount. This alert resets automatically when the pressure falls 20 psig below the threshold. When running both compressors the control will remove A1 and add a strike to it. The control will also set the ODFs to the high cool speed. The cause of the alert is usually an overcharged system, high outdoor ambient temperature coupled with dirty outdoor coil, plugged filter drier, or ODF speeds being set too low.

Alert A314 – CIR.A HPS TRIP

This alert occurs when the discharge high pressure switch opens. This alert resets automatically when the pressure falls below the switch threshold and the switch closes for 3 minutes. The control will add a strike for which ever compressors were on. The control will also set the ODFs to the high cool speed. The cause of the alert is usually an overcharged system, high outdoor ambient temperature coupled with dirty outdoor coil, plugged f

ilter drier, or

ODF speeds being set too low.

Alert A315 – CIR.A LOW DISCHARGE

This alert occurs when the discharge temperature is less than the OAT plus the configured LOW DISCHARGE LEV amount. This alert resets automatically. The control will add a strike for which ever compressors were on. The cause of the alert is usually an undercharged system, low outdoor ambient temperature coupled with dirty outdoor coil, plugged filter drier, or ODF speeds being set too high.

Alert A316 – CIR.A LOW SUCTION

This alert occurs when the compressor is operating and the evaporating temperature (converted from the suction pressure) is less than configured low suction control levels, LOW SUC LEVEL 1, LOW SUC LEVEL2,orLOW SUC LEVEL3.The circuit SST value must be less than LOW SUC LEVEL 1 (for 5 minutes), LOW S UC LEVEL 2 (for 4 minutes), or LOW SUC LEVEL 3 (for 3 minutes when using the economizer and 1.5 minutes when not using the economizer) for the alert to occur. When the outdoor temperature is less than 40_F, the above values are reduced 1_F for every 2_F OAT is below 40_F. All the above timers will reset if the suction temperature rises above LOW SUC OK TEMP for 1 minute. This alert causes a strike for the respective circuit. This alert will activate when the coil becomes frosted. However, during the 15--minute reset period, the coils will thaw and strike should clear and restart if there is nothing else wrong with the circuit. The alert resets automatically. The cause of the alert is usually low refrigerant charge, dirty filters, evaporator fan operating backwards, loose or broken belt, plugged filter drier, faulty transducer, excessively cold return air, or stuck open economizer when the ambient temperature is low.

Alert A317 – CIR.A PRESSURE RATIO

This alert occurs when the Circuit A pressure ratio is less than the configured MIN PRESSURE RATIO amount. This alert resets automatically. The control will add a strike for which ever compressors were on. The cause of the alert is usually an undercharged system, low outdoor ambient temperature coupled with dirty outdoor coil, plugged filter drier, or ODF speeds being set too high.

+ 114 hidden pages

Carrier 48/50FC 04-07, 48/50GC 04-06 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual