SIGHT GLASS.

TM 5-4120-339-14

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

4-19.

SIGHT GLASS.

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 4-17 and inspect the sight glass for damage or defects which would impair serviceability.

(3) Refer to paragraph 4-4c and check the sight glass for refrigerant leaks. Refer to paragraph 4-4d and

repair any leaks found.

b. Replace. Replace the sight glass if evidence is found of defects or damage which would impair serviceability.

Refer to paragraphs c and d for removal of defective sight glass and the installation of a new sight glass.

Removal. (See figure 4-17.)

d. Installation.

(1) Refer to figure 4-2 and release refrigerant from the system.

(2) Refer to figure 4-17 and install a new sight glass.

(3) Perform any further maintenance of refrigeration components required.

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

refrigerant system.

(5) Refer to paragraph 4-4c and check the sight glass and the dehydrator for refrigerant leaks. Refer to

paragraph 4-4d and repair any leaks found.

(6) Refer to figure 4-4 and evacuate the refrigerant system.

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

4-20.

EVAPORATOR COIL.

a. Test.

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

source.

(2) Refer to paragraph 4-4 and check the evaporator coil for refrigerant leaks.

b. Repair. Refer to paragraph 4-4d and repair any leaks found.

c. Replace. Replace the evaporator coil if unrepairable or if defects or damage would impair serviceability.

Refer to paragraph d and e for removal of defective evaporator coil and the installation of a new evaporator coil.

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