Air Conditioning Troubleshooting - Wolf Steel Condo Pack Installation And Operating Instructions Manual

52
7.2

AIR CONDITIONING TROUBLESHOOTING

WARNING!
IOM
IOM
FAULT CONDITION
Unit will not operate
Outdoor fan on;
Compressor off
Too little cooling
Compressor
operates in short
cycles
High head pressure;
Low suction
pressure
High head pressure;
Normal suction
pressure
W415-1307 / B / 03.31.2017
Low head pressure;
High suction
THIS TROUBLESHOOTING GUIDE IS INTENDED FOR USE BY
QUALIFIED SERVICE PERSONNEL ONLY!
POSSIBLE CAUSE
Power disconnected or loose connection
Blown fuse / breaker tripped
Thermostat out of calibration is set too high
Contactor defective
Transformer defective
High pressure control open (if provided)
Run or start capacitor defective
Start relay defective
Loose wire
Compressor stuck, grounded or open motor
winding, open internal overload
Low voltage condition
Improperly sized unit
Improper indoor airflow
Incorrect refrigerant charge
Air, non-condensables or moisture in
system
Incorrect voltage
Defective overload protector
Refrigerant undercharge
Restriction in liquid line, expansion device
or filter drier
Lack of sufficient indoor airflow
Dirty outdoor coil
Refrigerant overcharge
Outdoor fan not running
Air or non-condensables in system
Expansion device stuck in open position
CORRECTION
Check voltage at contactor in condensing unit
Replace fuses / reset breaker
Reset
Check for 24VAC at contactor coil, replace if open
Check wiring – replace transformer
Reset – see high pressure correction (high pressure
control opens at 600 psig)
Replace
Replace
Check for correct voltage at compressor – check
and tighten all connections
Wait at least 2 hours for overload to reset; if still
open, replace the compressor
Add start kit components
Recalculate load
Check-should be approximately 400 CFM per ton
Charge per procedure in installation manual
Recover refrigerant
At compressor terminals, voltage must be +/10% of
nameplate marking when unit is operating
Replace – check for correct voltage
Add refrigerant
Remove or replace defective component
Clean/check filters, registers, or evaporator coil
that may cause a restriction.
Clean coil
Correct system charge
Repair or replace
Recover refrigerant, evacuate and recharge
Replace expansion device
TABLE 6.