ARMY TM 9-4120-380-14
AIR FORCE TO 35E9-136-21
5.12. BRAZING/DEBRAZING PROCEDURES. Task covers service.
Tool kit, service, refrigeration unit (Item 1, Appendix B)
All refrigerant R-22 must be discharged from the system and the entire system must be
purged with dry nitrogen before beginning any debrazing operation.
The polyurethane foam used as insulation in the air conditioner will break down to form
toxic gases if exposed to the flame of a torch at brazing temperature.
Grade IV or Vl brazing alloy and Type B flux, as specified in MIL-B-7883, must be used
for all copper to brass joints. Grade m brazing alloy may be substituted for Grade IV or
VI for copper to coppery outs, flux is not required for copper to copper joints.
All tubing in the refrigeration system is seamless copper with a bright internal finish that
Rigid grade copper is used for straight sections and soft grade for sections that must be
bent. All interconnecting fittings, such as elbows, tees, etc. are also copper. The
bodies of all valves and all connections on other components are brass. All Joints,
except those provided with flare fittings are made by brazing in accordance with MJL-B-
7883, except that radiographic examination is not required.