REFRIGERANT SYSTEM CONTINUOUSLY LOSING REFRIGERANT

TM 5-4120-356-14

T a b l e 4-1. Troubleshooting (continued)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

INSUFFICIENT COOLING (continued)

Clogged dehydrator (drier)

Step 9.

R e p l a c e dehydrator in accordance with paragraph 4-14d.

Step 10. Restriction in liquid line.

Open system and remove refrigerant (figure 4-2). Purge system

in accordance with paragraph 4-8. Evacuate system (figure 4-4)

a n d recharge the system with refrigerant in accordance with

REFRIGERANT SYSTEM CONTINUOUSLY LOSING REFRIGERANT

Step 1.

Check refrigerant tubing and components for leaks in accordance

Repair leaks if possible in accordance with paragraph 4-4d.

Replace unrepairable tubing or components.

Step 2.

Check for defective relief valve in accordance with paragraph 4-14g.

Replace defective pressure relief valve.

5. AIR CONDITIONER NOISY DURING OPERATION

Step 1.

Check air conditioner operating pressures for excessive refriger-

ant in the system in accordance with paragraph 4-12f.

R e l e a s e excess refrigerant from the system until the proper

charge is attained (see figure 4-2).

Step 2.

Check for noisy compressor, indicating worn bearings or insuffic-

ient clearance between rotating parts.

R e p l a c e compressor in accordance with procedures given in

Step 3.

I n s p e c t expansion valve and check superheat in accordance with

Repair or replace damaged or defective expansion valve. Adjust

expansion valve if superheat is not correct in accordance with

4-4