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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.
a.
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

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