LEAK TESTING. - TM-5-4120-383-140199

TM5-4120-383-14

5-13.

BRAZING/DEBRAZING

PROCEDURES.-Continued

(5) Apply sufficient heat uniformly around the joint to

quickly raise it to a temperature that will melt the filler alloy.

Remove heat as soon as brazing is completed.

LEAK TESTING.

5-14.

Supplies:

Nitrogen cylinder (item 8, Appendix E)

Refrigerant-22 (item 4, Appendix E)

The entire refrigeration system should be thoroughly leak tested

after repair or replacement of any component before it is

recharged with Refrigerant-22. Leak testing is also the method for

troubleshooting when a system has lost all or part of its

refrigerant charge through an undetermined cause.

Disassembly.

NOTE

The following steps cover all the disassembly actions

necessary to prepare a system for complete leak

testing.

If the air conditioner has been partially

disassembled for repair, most of these actions will

already have been accomplished.

(1) Disconnect power at power source.

(2) Remove top covers. (See para 4-11.)

(3) Remove supply air louver. (See para 4-14.)

(4) Remove mist eliminator.

b. Testing Method.

There are two acceptable methods for leak

testing the refrigeration system.

(1) Refrigerant Gas Leak Detector. If an electronic

refrigerant gas leak detector is available it should be used in

accordance with the procedures contained in TM 9-4940-435-14, "Leak

Detector, Refrigerant Gas".

5-33