Chapter 5. GENERAL SUPPORT MAINTENANCE

TM 5-4120-339-14

CHAPTER 5

GENERAL SUPPORT MAINTENANCE

5-1.

GENERAL MAINTENANCE PROCEDURES.

a. Use a silver solder on all soldered connections. Silver solder with a 50 percent silver capacity and a melting

point of approximately 1300F (704C) is recommended.

b. Continually pass dry nitrogen through the tubing or connections being soldered or brazed to prevent the

formation of harmful copper oxides.

5-2.

REPLACEMENT OF CASING ASSEMBLY.

Replace casing assembly if damage is unrepairable and would impair serviceability.

WARNING

Disconnect the air conditioner from the electrical power source before performing

general maintenance procedures on the unit.

a. Turn the selector switch to the "OFF" position and disconnect the air conditioner from the electrical power

source.

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

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

d. Remove all components and tubing from the casing assembly.

e. Install all components and tubing in new casing assembly.

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

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

h. Refer to figure 4-4 and evacuate the refrigerant system.

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

j. Connect the air conditioner to the electrical power, turn the selector 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.

Repair any leaks found in

accordance with paragraph 4-4d.

If unit does not function properly, troubleshoot according to table 4-1.

5-1/(5-2 blank)