TM 9-4120-378-14
INITIAL SETUP
Materials/Parts:
Equipment Conditions:
Brazing alloy (silver) (Appendix E,
Refrigeration system discharged (paragraph 5.4)
Items 5 and 6)
Refrigeration system purged (paragraph 5.5)
Nitrogen cylinder (Appendix E, Item 4)
Main power source disconnected
Brazing flux (Appendix E, Item 7)
Abrasive cloth (Appendix E, Item 8)
Rags (Appendix E, Item 9)
Remarks
Action
Location/Item
Disconnect air conditioner power sup-
ply before doing maintenance work on
or near electrical system.
a.
General. All tubing in the refrigeration system is
copper with a finish that permits thorough cleaning.
All inter-connecting 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 MIL-B-7883,
except that radiographic examination is not re-
quired.
b.
Filler Alloy. Grade IV or VI brazing alloy and Type
B flux, as specified in MIL-B-7883, must be used for
all copper to brass joints. Grade III brazing alloy
may be substituted for Grade IV or VI for copper to
copper joints; flux is not required for copper to cop-
per joints.
c.
Debrazing. Debraze joints for removal of refrigera-
tion system components as follows:
All refrigerant-22 must be discharged
from the system and the entire system
must be purged with dry nitrogen be-
fore beginning any debrazing opera-
tion.
