oREFRIGERATION SYSTEM SERVICING -(BRAZING/DEBRAZING). - continued

TM 5-4120-386-14

5-12. REFRIGERATION SYSTEM SERVICING - (BRAZING/DEBRAZING) - Continued.

REMARKS

LOCATION/ITEM

ACTION

Reassembly. If tubing

sections or fittings were

removed with a component,

debraze them from the

component, clean the joints,

and braze them to the new

component before

reinstallation.

Brazing. Braze joints within

the air conditioner as follows:

( 1 ) Position the component

to be installed.

(2) To prepare a joint on a

valve for brazing,

disassemble the valve to

the extent possible.

Then wrap all but the

joint with a wet rag to

act as a heat sink.

( 3 ) Protect insulation,

wiring harnesses, and

surrounding components

with appropriate shields.

(4) Be sure the work area is

well ventilated and that

dry nitrogen is flowing

through the refrigeration

system at a rate of less

than 1-2 cfm

(0.3028-0.057

m /minute).

( 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.

5-41