Table 5-l. Direct support troubleshooting-Continued.

TM 5-4120-386-14

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

2. COMPRESSOR STARTS, BUT STOPS AT ONCE - "SHORT CYCLES"

Inspect evaporator coil for dirt or icing, and check for obstructions at

Step 1.

outlet louver.

Clean dirty evaporator coil; defrost in heat mode, or remove

obstructions from outlet louver.

Step 2.

Check for proper operation of condenser fan and motor.

a. Repair faulty condenser fan/motor.

b. Replace bad motor. (Refer to paragraphs 4-34 and

4-35.)

Do not exceed 12 second operating time for compressor, or vacuum may

be formed in suction side of refrigeration system and damage it.

Turn off power; short-circuit ("jumper") the high pressure switch. Turn

Step 3.

on power. For maximum of 12 seconds cycle compressor to see whether

compressor operates normally.

Replace faulty high pressure switch. (Refer to paragraph 5-23.)

Step 4.

Check dehydrator to see that it is not sweating, frosting or cold to the

touch.

If so, replace obstructed dehydrator. (Refer to paragraph 5-17.)

Step 5.

Check refrigerant system for leaks, using a halogen or electronic leak

detector. Refrigerant charge may be low, as indicated by bubbles in

liquid sight indicator, or non-condensable gas may have entered system.

If refrigerant charge is low, but no leaks are found, discharge

and purge system, repair or replace leaking component, and

recharge. (Refer to paragraphs 5-9 through 5-16.)

5-3