Chapter 5: GENERAL SUPPORT MAINTENANCE

TM 5-4120-356-14

CHAPTER 5

GENERAL SUPPORT MAINTENANCE

GENERAL MAINTENANCE PROCEDURES

5-1.

a . U s e a silver solder on all soldered connections. Silver solder with a 50

p e r c e n t silver capacity and a melting point of approximately 1300 (704C) is rec

amended.

b . C o n t i n u a l l y pass dry nitrogen through the tubing or connections being

s o l d e r e d or brazed to prevent the formation of harmful copper oxides.

R e p l a c e the casing assembly if damage is un

REPLACEMENT OF CASING ASSEMBLY

5-2.

repairable and would impair serviceability.

WARNING

Disconnect the air conditioner from

t h e electrical power source before

a t t e m p t i n g to perform general maint-

e n a n c e on the unit.

a . T u r n the selector switch to the "OFF" position and disconnect the air

conditioner from the electrical power source.

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

Remove all panels, grilles, filters and screens from the unit.

Remove all components and tubing from the casing assembly.

I n s t a l l all components and tubing in new casing assembly.

Install panels, grilles, filters and screens in new casing assembly.

Refer to paragraph 4-8 and purge the refrigerant system.

Refer to figure 4-4 and evacuate the refigerant system.

R e f e r to paragraph 4-10 and charge the system with refrigerant.

j. C o n n e c t the air conditioner to the electrical power source. Turn the

s e l e c t o r switch to the "COOL" position and turn the thermostat control knob counter-

clockwise to its limit.

k. Using available leak detector, check the entire unit for refrigerant leaks.

R e p a i r any leaks found.

l . I f air conditioner does not function properly, troubleshoot unit in accor-

d a n c e with table 41.

5-1 (5-2 Blank)