TM 9-4120-395-14&P
5-7. BRAZING/DEBRAZING PROCEDURES.
This task covers:
Service
INITIAL SETUP:
Tools:
Tool kit, service, refrigeration unit
Safety goggles
Materials:
Rags (Appendix F, Item 7)
Nitrogen (Appendix F, Item 2)
Brazing alloy, silver, (Appendix F, Items 3 and 4)
Brazing flux (Appendix F, Item 5)
Abrasive cloth (Appendix F, Item 6)
Equipment Condition:
Power off at power source.
Refrigerant system discharged. See para 5-5.
Both front door assemblies removed. See para 4-17.
General Safety Instructions:
HIGH VOLTAGE is used in the operation of this equipment. DEATH ON CONTACT
or severe injury may result if personnel fail to observe safety precautions. Always
disconnect the air conditioner from power source before per- forming maintenance
on this equipment. If power must remain on for troubleshooting, exercise extreme
care to avoid contact with any electrical component, fan, fan motor, etc. Do not
operate the air conditioner without Louvers, top controls, and guards in place and
tightly secured.
All refrigerant-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.
5-9
