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TM 9-4120-367-14
TM 07592B-14/1
6.9 COMPRESSOR. - Continued
Location/Item
Charging
- Continued
Diagnosing
Compressor
Motor Burnout
Action
a.
b.
c.
d.
e.
The electronic leak detector is sensitive
to the presence of refrigerant gas in the
atmosphere. When refrigerant gas is
present in the atmosphere of the work
area, false indications can result. Use in
a well-ventilated but draft-free area.
Simple failure, without motor burnout, does not
require extensive cleaning of entire refrigerant
system that burnout requires.
Motor burnout indicates other problems have
contributed to the failure.
These problems must be corrected or avoided to
prevent repetition of the burnout.
A compressor motor that fails to start maybe due
to improper voltage, a faulted motor thermal
switch (S8), a malfunction of the compressor
start relay, or a compressor mechanical fault.
Make certain that a burnout has occurred by do-
ing the following:
(1)
(2)
(3)
(4)
(5)
(6)
(7)
Check for proper voltage.
Remove power connector from unit.
Check S8 for full continuity between pins D
and E on motor plug P-4.
Check power at compressor connector by
jumping pins D and E.
Remove the compressor leads at the com-
pressor side of the start relay.
Close the disconnect switch to energize the
control circuit.
Check for voltage on all lines at both the line
and load side of the compressor relay K3.
Remarks
6-30
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