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 TM 5-4120-393-14
5-11. Brazing/Debrazing Procedures (cont)
1.
Debrazing. Debraze joints for removal of refrigeration system components as follows:
a.
Determine which joints are to be debrazed. Due to the limited work space inside the air conditioner, it may be
more convenient to remove a part of the interconnecting tubing with the component rather than debrazing the joint
on the component itself.
b.
Before debrazing a joint on a valve, disassemble the valve to the extent possible, then wrap all but the joint with a
wet rag to act as a heat sink.
c.
Protect insulation, wiring harnesses, cabinet, and other surrounding components with appropriate shields.
d.
Be sure the work area is well ventilated and that dry nitrogen is flowing through the refrigeration system at a rate
3
of less than 1-2 cfm (0.028-0.057 m /minute).
e.
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.
2.
Cleaning Debrazed Joints. All filler alloy must be cleaned from debrazed joints before reassembly. Heat each piece
of the joint until the filler alloy is melted and then wipe it away with a damp cloth. Be sure no filler alloy or other debris
are left inside any tubing, fitting, or component.
3.
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.
4.
Brazing.
Braze joints within the air conditioner as follows:
a.
Position the component to be installed.
b.
To prepare a joint on a valve for brazing, disassemble the valve to the extent possible, then wr ap all but the joint
with a wet rag to act as a heat sink.
c.
Protect insulation, wiring harnesses, and surrounding components with appropriate shields.
d.
Be sure the work area is well ventilated and that dry nitrogen is flowing through the refrigerat ion system at a rate
3
of less than 1-2 cfm (0.028-0.057 m /minute).
e.
Apply sufficient heat uniformly around the joint to quickly raise it to a temperature that will melt the filler alloy.
Remove the heat as soon as brazing is completed.
5-23
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