COMPRESSOR SHORT CYCLES. - TM-5-4120-364-130057

TM 5-4120-364-13

Table 4-1. Troubleshooing (continued)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

COMPRESSOR SHORT CYCLES.

S t e p 1. Excessive refrigerant in systmm.

Purge refrigerant system of refrigerant until proper

c h a r g e is attained. (13 pounds 8 ounces of Type 12 refrigerant).

Step 2. Air or non-condensable gas in refrigerant system.

P u r g e the refrigerant system and recharge with refrigerant

(para 4-10).

AIR CONDITIONER OPERATES CONTINUOUSLY.

S t e p 1. Insufficient refrigerant in system.

Add refrigerant (para 4-8).

5. AIR CONDITIONER STOPS DUE TO HIGH PRESSURE SWITCH TRIPPING.

Step 1. Refrigerant overcharge.

P u r g e refrigerant system of refrigerant until proper charge

is attained. (13 pounds 8 ounces of Type 12 refrigerant).

Step 2. Condenser air flow restricted.

Clean conenser coil or remove restriction.

6. MOTOR COMPRESSOR KNOCKS OR DEVELOPS SUDDEN NOISE.

Step 1. Defective expansion valve.

Adjust or replace expansion valve (para 4-11 and figure 44).

S t e p 2 . I n t e r n a l f a i l u r e ( c o n n e c t i n g r o d , p i s t o n , b e a r i n g , etc) in compressor

Reme and replace rotor compressor (para 4-16 and figures

4-10, 4-11).

4-3