TM 10-8145-222-23
0090
REPAIR CONTINUED
WARNING
breathing vapors or fumes from soldering operations. Perform operations only in well
and flux. Wear gloves and protective goggles or face shield to protect against burns.
Desolder
1. Recover refrigerant (WP 0014, Service).
2. Purge refrigerant system (WP 0014, Service).
3. Protect wiring harnesses and other components with appropriate heat shields.
NOTE
It may be easier to access a component by cutting or desoldering copper lines in
accessible areas and removing part of interconnecting tubing.
4. If desoldering a joint on a valve, disassemble valve as much as possible and wrap all but joint with wet rag to act
as heat sink.
WARNING
Never use a heating torch on any part that contains refrigerant. Heat may cause
refrigerant to decompose and release irritating, toxic, and corrosive gases. All
refrigerant must be removed and recovered from system and entire system must be
purged with dry nitrogen before beginning any brazing operation.
CAUTION
If heat is applied slowly, or only on one side, entire component or length of tubing will
be heated and filler alloy in adjacent joints may also be melted.
5. Check that system is being purged and apply sufficient heat uniformly around joint to quickly melt filler alloy.
6. Remove heat as soon as joint is separated.
Clean
1. Heat each piece of joint until filler has melted, then wipe it away with a wire brush.
2. Make sure no filler alloy or other debris remains inside any tubing, fitting, or component.
3. Use abrasive cloth as necessary to clean joints.
4. Apply flux to joints immediately after cleaning to avoid oxidation.
0090-2