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TM 5-4120-364-13
Table 4-1. Troubleshooting
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
INSUFFICIENT COOLING
1.
S t e p 1. Insufficient refrigerant in system.
Add refrigerant (para. 4-8).
Step 2. Defective expansion valve,
Replace expansion valve (figure 4-4).
S t e p 3. Discharge service, d i s c h a r g e s h u t o f f , r e c e i v e r o u t l e t , s u c t i o n
line shutoff, or suction line service valve(s) closed.
Open valve(s) (figure 4-3).
S t e p 4. Air in refrigerant system.
E v a c u a t e refrigerant system (para 4-9) and charge with
refrigerant (para 4-10).
Step 5. Clogged filter drier.
Replace filter drier ( para. 4-13).
Step 6. Restriction in liquid line.
O p e n system and remove restriction.
Step 7. Refrigerant overcharge,
P u r g e the refrigerant system until proper charge for system
i s attained. (13 pounds 8 ounces of Type 12 refrigerant).
AIR CONDITIONER NOISY DURING OPERATION.
2.
Step 1. Compressor oil level low.
A d d oil to compressor until level shows up to one-half of
the oil sight glass on the rotor compressor.
S t e p 2. Compressor sluggish due to overcharge.
P u r g e refrigerant system of refrigerant until proper charge
i s attained. (13 pounds 8 ounces of Type 12 refrigerant).
4-2

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