TM 9-4120-378-14
COMPRESSOR-TEST/REPAIR/REPLACE. This task covers test, removal, repair and installation.
INITIAL SETUP
Equipment Conditions:
Materials/Parts:
Rear and center top covers removed (paragraph 4.17)
Nitrogen (Appendix E, Item 4)
Refrigerant R-22 (Appendix E, Item 10)
Refrigerant system discharged (paragraph 5.4)
Refrigerant R-n (Appendix E, Item 12)
Condenser coil removed (paragraph 5.24)
Brazing solder (Appendix E, Items 5 and 6)
Brazing flux (Appendix E, Item 7)
Special Tool:
Clean glass container
Action
Location/Item
Remarks
Disconnect air conditioner power sup-
ply before doing maintenance work on
the electrical system.
Disconnect the compressor electrical connector See wiring diagram,
Test
plug (P10) (15).
Using a multimeter, test for continuity between pins
A and B, B and C, and C and A of the compressor
electrical receptacle (15). Continuity should exist.
If not, replace compressor.
Check for continuity between pins A, B and C and
the compressor housing. No continuity should ex-
ist. if continuity exists, replace compressor.
Check for continuity between pins D and E. Conti-
nuity should exist. If the high temperature thermo-
stat is open, let the compressor cool, then recheck
for continuity. If continuity does not exist after al-
lowing the compressor to cool, replace compres-
sor.
If compressor windings are bad, check for com-
pressor burn-out prior to installing new compres-
sor.
With dry nitrogen flowing through refrigerant sys-
Removal
See paragraph 5.6.
tem, debraze tubing from connections (X).
