Safety Considerations - Carrier 50PD05 Operating And Service Instructions

Variable Frequency Drive (VFD) ...................... 53
Integrated Gas Control (IGC) Board ................... 54
Low Voltage Terminal Strip (TBI) ..................... 55
Scrolling Marquee Display .......................... 56
Accessory Navigator
TM
Display ....................... 56
Carrier Comfort Network (CCN)® Interface ............. 56
Field-Installed Accessories .......................... 56
SERVICE ......................................... 59
Cleaning ........................................ 60
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 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. 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 iniury.
Understand the signal words DANGER, WARNING, and
CAUTION. These words are used with the safety-alert symbol.
DANGER identifies the most serious hazards which will result in
severe personal iniury or death. WARNING signifies a hazard
which could result in personal iniury or death. CAUTION is used
to identify unsafe practices which may result in minor personal
iniury or product and property damage. NOTE is used to highlight
suggestions which will result in enhanced installation, reliability, or
operation.
ELECTRICALSHOCK HAZARD
Failure to follow this warning could cause personal
iniury 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.
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.
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal
iniury, death and/or property damage.
Improper installation, adjustment, alteration, service, or
maintenance can cause property damage, personal
iniury, 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.