QUENCH VALVE.

TM 5-4120-339-14

Repair. If the expansion valve is leaking refrigerant, refer to figure 4-13 and repair the expansion valve.

d. Replace. If damage or defects are found which would impair serviceability and are beyond repair, replace the

expansion valve. Refer to paragraphs e and f for removal of defective valve and installation of a new valve.

e. Removal. (See figure 4-13.)

Installation.

(1) Refer to figures 4-12 and 4-13 and install the expansion valve.

(2) Perform any further maintenance of refrigeration components required at this time.

(3) If no further maintenance of refrigeration components is required, refer to paragraph 4-8 and purge the

refrigerant system.

(4) Refer to paragraph 4-4c and check the expansion valve and the dehydrator for refrigerant leaks. Refer to

paragraph 4-4d and repair any leaks found.

(5) Refer to paragraph 4-10 and charge the system with refrigerant.

(6) Re-perform inspection procedure (paragraph a) for the expansion valve to check of refrigerant leaks.

4-16.

QUENCH VALVE.

a. Inspection.

(1) Turn the selector switch to the "OFF" position and disconnect the air conditioner from the electrical power

source.

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

(3) Refer to figure 3-4 and remove the evaporator fan.

(4) Refer to figure 4-12 and inspect the quench valve, power bulb and tubing for obvious defects. If any

obvious defects are found replace the quench valve.

(5) Refer to paragraph 4-4c and check the quench valve for refrigerant leaks. If quench valve is leaking

refrigerant, refer to paragraph c for repair.

b. Adjust.

CAUTION

Never adjust the quench valve unless absolutely necessary. When adjusting the

quench valve, allow the unit to run on "COOL" for at least 20 minutes between

each adjustment. Make sure that all panels are in place during running period.

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