Table 5-l. Direct support troubleshooting-Continued.

TM 5-4120-386-14

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

4. COMPRESSOR RUNS BUT DOES NOT COOL

Step 1.

Check for excessively high temperature in conditioned area.

a. Close doors, windows or other openings.

b. Insulate areas of high heat gain.

Step 2. Check compressor for noisy operation, high suction pressure or

excessively low discharge pressure indicating leaky internal valves.

Replace compressor (Refer to paragraph 5-28.)

Step 3. Check liquid sight indicator for bubbles indicating low charge of

refrigerant.

a. Repair leaks or replace leaking component.

b. Purge and recharge system (Refer to paragraphs 5-11

and 5-15.)

Step 4. Check for high discharge pressure (Refer to table 5-2.)

Purge or bleed off excess refrigerant; check high-pressure

switch or pressure regulator valve.

5. COMPRESSOR EXCESSIVELY NOISY

Listen for knocking.

Step 1.

Check for high pressure indicating that liquid refrigerant is

returning to compressor (Refer to paragraph 5-16 and table

Step 2. Check for high discharge pressure, indicating overcharge of refrigerant

Purge or bleed off excess refrigerant; check high-pressure

switch or pressure regulator valve.

5-5