DIRECT SUPPORT TROUBLESHOOTING TABLE

TM 5-4120-374-13

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

3. INSUFFICIENT COOLING

Step 1. Inspect sight glass for proper amount of refrigerant.

Add refrigerant as required (para. 5-7).

Step 2. Check to see if dehydrator is clogged or defective.

Remove restriction or replace dehydrator (para. 5-12).

Step 3. Check for air in refrigerant system.

Purge refrigerant system (para. 5-7).

Step 4. Inspect expansion valve for proper operation and damage.

Replace defective expansion valve (para. 5-14).

4. LOW SUCTION PRESSURE

Step 1. Inspect expansion valve for proper operation.

Replace defective expansion valve (para. 5-14).

Step 2. Check to see if dehydrator is clogged or defective.

Remove restriction or replace dehydrator (para. 5-12).

5. LOW SUCTION AND DISCHARGE PRESSURE

Step 1. Inspect sight glass for proper amount of refrigerant.

Add refrigerant as required (para. 5-7).

Step 2. Inspect refrigerant piping for leaks.

Repair leaks or replace piping (para. 5-9).

Step 3. Inspect expansion valve for proper operation and damage.

Replace defective expansion valve (para. 5-14).

5-3