Table 4-1. Troubleshooting - TM-5-4120-364-130056

TM 5-4120-364-13

Table 4-1. Troubleshooting

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

INSUFFICIENT COOLING

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.

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