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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

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