Napoleon Condo Pack - Page 51

51
IOM
W415-2288 / 08.29.2019
AIR CONDITIONING TROUBLESHOOTING GUIDE
WARNING!
THIS TROUBLESHOOTING GUIDE IS INTENDED FOR USE BY
QUALIFIED SERVICE PERSONNEL ONLY!
FAULT CONDITION
POSSIBLE CAUSE
CORRECTION
Compressor Operates in
short cycles
Incorrect voltage
At compressor terminals, voltage must be
+/10% of nameplate marking when unit is
operating
Defective overload protector Replace - check for correct voltage
Refrigerant undercharge Add refrigerant
High head pressure;
Low suction pressure
Restriction in liquid line, expansion
device or filter drier
Remove or replace defective component
Lack of sufficient indoor airflow
Clean/Check filters, registers, or
evaporator coil that may cause a
restriction
High head pressure;
Normal suction pressure
Dirty outdoor coil Clean coil
Refrigerant overcharge Correct system charge
Outdoor fan not running Repair or replace
Air or non-condensables in system
Recover refrigerant, evacuate and
recharge
Low head pressure;
High suction pressure
Expansion device stuck in open position Replace expansion device
Defective compressor valves Replace compressor
Low suction pressure;
Compressor cool;
Ice on indoor coil
Low indoor airflow
Increase speed of blower or reduce
restriction - replace air filter
Operating below 65deg F outdoors
Add low ambient kit
Moisture in system
Recover refrigerant – evacuate and
recharge-replace filter drier
High suction pressure; or
fluctuating head and
suction pressures
Excessive Load
Recheck load calculation
Defective compressor
Replace
TXV hunting
Check TXV bulb clamp – check air
distribution on coil – replace TXV
Air or non-condensibles in system
Recover refrigerant, evacuate and
recharge
Pulsing noise at expansion
device or liquid line
Air or non-condensibles in system
Recover refrigerant, evacuate and
recharge
Registers sweat Low indoor airflow
Increase speed of blower or reduce
restriction
TABLE 8. CONT.