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Variable Frequency Drive (VFD) 53......................
Integrated Gas Control (IGC) Board 54...................
Low Voltage Terminal Strip (TB1) 55.....................
Scrolling Marquee Display 56..........................
Accessory Navigatort Display 56.......................
Carrier Comfort Network (CCN)R Interface 56.............
Field--Installed Accessories 56..........................
SERVICE 59.........................................
Cleaning 6 0........................................
Lubrication 62......................................
Evaporator Fan Service and Replacement 62...............
Evaporator Fan Performance Adjustment 62...............
Evaporator Fan Belt Tension Adjustment 63...............
Variable Frequency Drive (VFD) Replacement 63...........
Condenser--Fan Adjustment 63..........................
Verify Sensor Performance 64..........................
Economizer Operation During Power Failure 64............
Evacuation 64.......................................
Refrigerant Charge 64.................................
Gas Valve Adjustment (48PD Units Only) 65...............
High Altitude (48PD Units Only) 66.....................
Main Burners ( 48PD Units Only) 66.....................
Filter Drier 66.......................................
Protective Devices 66.................................
Relief Devices 67....................................
Compressor Sound Shield 67...........................
Control Circuit, 24--V 67..............................
Replacement Parts 67.................................
Diagnostic LEDs 67..................................
APPENDIX A -- LOCAL DISPLAY AND
CCN TABLES 68.....................................
APPENDIX B -- STARTUP DATA 81.....................
APPENDIX C -- ADDITIONAL STARTUP DATA 91.........
APPENDIX D -- ADDITIONAL STARTUP DATA 100.......
UNIT START-- UP CHECKLIST 105......................
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 m aintenance functions o f 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. Wear
safety glasses and work gloves. Use quenching cloth for unbrazing
operations. Have fire extinguishers available for all brazing
operations.
Follow all safety codes. Wear safety glasses and work gloves.
Have fire extinguisher available. Read these instructions
thoroughly and follow all warnings or cautions attached to the unit.
Consult local building codes and National Electrical Code (NEC)
for special requirements.
Recognize safety information. This is the safety--alert symbol
.
When you see this symbol on the unit and in instructions or
manuals, be alert to the potential for personal injury.
Understand the signal words DANGER, WARNING, and
CAUTION. These words are used with the safety--alert symbol.
DANGER id entifies the most serious h azards which will result in
severe personal injury or death. WARNING signifies a hazard
which could result in personal injury or death. CAUTION is used
to identify unsafe practices which may result in minor personal
injury or product and property damage. NOTE is used to highlight
suggestions which will result in enhanced installation, reliability, or
operation.
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.
!
WARNING
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.
CAUTION
!
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.
!
WARNING
48/50PD