BRAZING/DEBRAZING PROCEDURES.-Continued

TM5-4120-384-14

5-13.

BRAZING/DEBRAZING PROCEDURES.-Continued

(3) Protect insulation,

wiring harnesses,

and

other

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

1 - 2 c f m ( 0 . 0 2 8 - 0 . 0 5 7 m3 / m i n u t e ) .

(5) Apply sufficient heat uniformly around the joint to

quickly melt the filler alloy.

If heat is applied slowly, or only

on one side, the entire component or length of tubing will be

heated and filler alloy in adjacent joints may also be melted.

Remove heat as soon as the joint separates.

Cleaning Debrazed Joints.

All filler alloy must be cleaned

Heat each piece of the

from debrazed joints before reassembly.

joint until the filler alloy is melted and then wipe it away with a

Be sure no filler alloy or other debris is left inside

damp cloth.

any tubing, fitting, or component.

If tubing sections or fittings were removed

Reassembly.

with a component debraze them from the component, clean the

joints and braze them to the new components before reinstallation.

Brazing.

Braze

joints

within

the

air

conditioner

follows:

(1)

Position

component

installed.

(2) To prepare for brazing a joint on

a valve, disassemble

valve to the extent possible, then wrap all

but the joint with a

wet cloth to act as a heat sink.

(3) Protect

insulation,

wiring harnesses,

and

surrounding

components with

appropriate

shields.

(4) Be sure work area is well ventilated and that

dry

nitrogen is flowing through

the refrigeration system at

a rate

1 - 2 cfm (0.028 - 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.

5-29