System Clean Up (flushing)

TM 5-4120-339-14

(2) Refer to figure 3-13 and partially remove the junction box.

(3) If the compressor is obviously burned out, proceed to step c.

(4) If the compressor is inoperative, but does not appear to be burned out, refer to figure 3-7 (wiring diagram)

and test the compressor wire bundle for continuity.

(5) Repair or replace any broken wires found and check for compressor operation. If compressor now

operates properly, no further maintenance action is required on the compressor.

(6) If no broken wires are found, or if the compressor fails to operate after broken wires are repaired or

replaced, refer to table 4-1 and troubleshoot the compressor.

(7) If troubleshooting fails to isolate and correct the problem, proceed to step c.

c. Replace. Replace the compressor if burned out or if the compressor has damage which would impair

serviceability. Refer to step d for removal of defective compressor, step e for system clean up (flushing), and step f for

installation of a new compressor.

d. Removal. (See figure 4-18.)

e. System Clean Up (flushing). When a hermetic motor burns out, the stator winding decomposes forming

carbon, water and acid which contaminates refrigerant systems. These contaminates must be thoroughly removed from

the system to prevent repeated motor failures. Motor burn out may also cause damage to the air conditioner electrical

system. The following clean up procedures must be followed in any case of compressor failure.

(1) Perform removal procedure (step d, above).

(2) Refer to figure 4-16 and remove the dehydrator. Do not replace with a new dehydrator at this time.

(3) Flush the refrigerant system with trichlorotrifluroethane refrigerant solvent R-114 (National Stock Number

6830-00-782-6512). Flushing should be done under a pressure of 8 to 12 psig (.56 to .84 ks/cm2), using a pump of

approximately 1/3 horse power. The R-114 my be recirculated if run through a 10 micron filter. Procedures for flushing

the system are as follows:

(a) Refer to figure 4-19 and connect the discharge line of the pump to the tubing at point 1. Connect the

recovery line to the tubing at point 2. Leave the suction pressure service valve (point 3) closed. Cap the tubing at points

4 and 5.

(b) Start the pump and flush the line for approximately 10 minutes then turn the pump off.

(d) Connect the recovery line to the valve at point 3 and open the suction pressure service valve.

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