AIR CONDITIONER STOPS DUE TO HIGH PRESSURE SWITCH TRIPPING

TM 5-4120-356-14

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

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

AIR CONDITIONER NOISY DURING OPERATION (continued)

I n s p e c t quench valve and check s u p e r h e a t in accordance with para-

Step 4.

g r a p h 4-14k.

R e p a i r or replace damaged o r d e f e c t i v e q u e n c h v a l v e . A d j u s t

q u e n c h valve superheat in a c c o r d a n c e with paragraph 4-14k.

AIR CONDITIONER STOPS DUE TO HIGH PRESSURE SWITCH TRIPPING

Step 1.

Check air conditioner operating pressures for excessive refrig-

erant 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 restriction in condenser air flow.

Clean condenser coil and/or remove restriction in accordance

7. AIR CONDITIONER OPERATES CONTINUOUSLY ON COOLING CYCLE

Step 1.

Check for insufficient refrigerant in the system indicated by

bubbles in the sight glass.

A d d refrigerant in accordance with the procedures given in

Step 2.

I f adding refrigerant to the system does not clear up bubbles in

the sight glass, there may be air in the system.

R e m o v e refrigerant from the system (see figure 4-2). Purge

t h e system in accordance with paragraph 4-8. Evacuate the

system (see figure 4-4) and recharge the system with refrig-

erant in accordance with paragraph 4-10.

SIGHT GLASS SHOWS YELLOW INSTEAD OF GREEN

Step 1.

Yellow in sight glass is caused by contamination in the refriger-

ant.

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

Remove dehydrator (drier) (see figure 4-16) and purge the

s y s t e m in accordance with the procedures given in paragraph

4-8. Install a new dehydrator (drier) (see figure 4-16),

4-5