Service Manual

ManualsBrandsGOODMAN ManualsAir Conditioners4 Ton 14 SEER R-410A Multi-Position Package Air Conditioner Heat Pump

SERVICING

S-17D OPERATION TEST

If the voltage, capacitor, overload and motor winding test fail to

show the cause for failure:

WARNING

1. Remove unit wiring from disconnect switch and wire a test

cord to the disconnect switch.

NOTE: The wire size of the test cord must equal the line wire

size and the fuse must be of the proper size and type.

2. With the protective terminal cover in place, use the three

leads to the compressor terminals that were disconnected

at the nearest point to the compressor and connect the

common, start and run clips to the respective leads.

3. Connect good capacitors of the right MFD and voltage rat-

ing into the circuit.

4. With power ON, close the switch.

WARNING

LINE VOLTAGE NOW PRESENT.

A. If the compressor starts and continues to run, the

cause for failure is somewhere else in the system.

B. If the compressor fails to start - replace.

S-18 TESTING CRANKCASE HEATER

Note: Not all compressors use crankcase heaters.

The crankcase heater must be energized a minimum of twenty-

four (24) hours before the compressor is operated.

Crankcase heaters are used to prevent migration or accumula-

tion of refrigerant in the compressor crankcase during the off

cycles and prevents liquid slugging or oil pumping on start up.

On some models, the crankcase heater is controlled by a crank-

case heater thermostat that is wired in series with the crank-

case heater.

A crankcase heater will not prevent compressor damage due

to a floodback or over charge condition.

WARNING

DISCONNECT POWER SUPPLY BEFORE SERVICING.

1. Disconnect the heater lead wires.

2. Using an ohmmeter, check heater continuity - should test

continuous, if not, replace.

S-18A CHECKING CRANKCASE HEATER

THERMOSTAT

Note: Not all models with crankcase heaters will have a

crankcase heater thermostat.

1. Install a thermocouple type temperature test lead on the

discharge line adjacent to the crankcase heater thermo-

stat.

2. Check the temperature at which the control closes its con-

tacts by lowering the temperature of the control. The crank-

case heater thermostat should close at 67°F ± 5°F.

3. Check the temperature at which the control opens its con-

tacts by raising the temperature of the control. The crank-

case heater thermostat should open at 85°F ± 5°F.

4. If not as above, replace control.