2
• REMOTE DISABLE
•ALARMS
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Jobsite Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
• CHECKS TO THE AREA
• WORK PROCEDURE
• GENERAL WORK AREA
• CHECKING FOR PRESENCE OF REFRIGERANT
• PRESENCE OF FIRE EXTINGUISHER
• NO IGNITION SOURCES
• VENTILATED AREA
Electrical Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Repairs to Sealed Components . . . . . . . . . . . . . . . . 53
Repair to Intrinsically Safe Components . . . . . . . . 53
Cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Condensate Drain Pans . . . . . . . . . . . . . . . . . . . . . . 54
Refrigerant System . . . . . . . . . . . . . . . . . . . . . . . . . . 54
• REFRIGERATING EQUIPMENT.
• DETECTION OF FLAMMABLE REFRIGERANTS
Compressor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Fan Motors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Condensate Drain Cleaning . . . . . . . . . . . . . . . . . . . 54
Air Coil Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Condenser Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . 54
• GRAVITY FLOW METHOD
• FORCED CIRCULATION METHOD
Removal and Evacuation . . . . . . . . . . . . . . . . . . . . . 55
Refrigerant Charging . . . . . . . . . . . . . . . . . . . . . . . . . 55
• CHARGING PROCEDURES
• RECOVERY
Blower Assembly Service and Removal . . . . . . . . . 56
Vertical Configuration Units . . . . . . . . . . . . . . . . . . . 56
Horizontal Configuration Units . . . . . . . . . . . . . . . . 58
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
• UNIT PROTECTION MODULE (UPM)
Thermostatic Expansion Valves . . . . . . . . . . . . . . . 59
• TXV FAILURE
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . CL-1
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 basic maintenance functions of
cleaning coils and filters and replacing filters. All other operations
should be performed by trained service personnel. 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.
Improper installation, adjustment, alteration, service,
maintenance, or use can cause explosion, fire, electrical shock or
other conditions which may cause personal injury or property
damage. Consult a qualified installer, service agency, or your
distributor or branch for information or assistance. The qualified
installer or agency must use factory-authorized kits or accessories
when servicing or repairing this product. Refer to the individual
instructions packaged with the kits or accessories when installing.
Follow all safety codes. Wear safety glasses and work gloves. Use
quenching cloth for brazing operations. Have fire extinguisher
available. Read these instructions thoroughly and follow all
warnings or cautions attached to the unit. Consult local building
codes and the National Electrical Code (NEC) for special
installation requirements.
Understand the signal words — DANGER, WARNING, and
CAUTION. DANGER identifies the most serious hazards which
will result in severe personal injury or death. WARNING signifies
hazards that could result in personal injury or death. CAUTION is
used to identify unsafe practices, which would result in minor
personal injury or product and property damage.
It is important to recognize safety information. These are the
safety alert symbols. When you see these symbols on the unit
and in instructions or manuals, be alert to the potential for
personal injury.
WARNING
WARNING: RISK OF FIRE
Flammable Refrigerant Used — To be repaired only by trained
service personnel. DO NOT puncture refrigerant tubing.
WARNING
Do not use means to accelerate the defrosting process or to
clean, unless recommended in these instructions.
WARNING
Do not pierce or burn refrigerant lines. Be aware that refriger-
ants may not contain an odor.
WARNING
WARNING: RISK OF FIRE
Flammable Refrigerant Used — Dispose of properly in
accordance with federal or local regulations.
WARNING
The appliance shall be stored in a room without continuously
operating ignition sources (for example: open flames, an oper-
ating gas appliance or an operating electric heater).
WARNING
Installation of auxiliary electric heaters in connecting
ductwork must adhere to Carrier-approved models exclu-
sively. Carrier bears no responsibility for the installation of
any alternative auxiliary devices installed in the field.
