INSUFFICIENT COOLING - TM-9-4120-428-140068

TM 9-4120-428-14

0012 00

The quench valve is defective.

CORRECTIVE ACTION

Check the quench valve and replace if defective.

The internal overload switch on the compressor motor is defective.

CORRECTIVE ACTION

If the internal overload switch is defective, replace the compressor motor.

Solenoid valves L1 and L2 are defective.

CORRECTIVE ACTION

Check and repair solenoid valves L1 and L2 or replace defective valves if necessary.

TROUBLESHOOTING PROCEDURE

INSUFFICIENT COOLING

SYMPTOM

The air conditioner is not putting out enough cool air.

NOTE

Frost on the evaporator coil is usually caused by either an obstruction to airflow or dirty

coils, filters, or mist eliminators.

MALFUNCTION

The condenser air discharge louvers are closed.

CORRECTIVE ACTION

Check the actuating cylinder to ensure that the condenser discharge louvers are

open and replace if defective. (WP 0082 00).

The sight glass window displays a bubbly, green refrigerant charge.

CORRECTIVE ACTION

Operate air conditioner for at least 15 minutes with the TEMPERATURE

SELECTOR switch in the maximum COOLER position. Check the sight glass

window; the center should be bubble-free and green. Add refrigerant if the

charge is low.

NOTE

A clogged dehydrator may cause bubbles in the refrigerant. (WP 0075 00).

Refrigerant is leaking from the air conditioner.

CORRECTIVE ACTION

Repair or change defective parts as necessary. (WP 0000 00).

Solenoid Valves L1 and L2 are defective.

CORRECTIVE ACTION

Check solenoid valves L1 and L2 and repair or replace if defective. (WP 0079

0012 00-2