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 TM5-4120-384-14
Table
4-2.
TROUBLESHOOTING-Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
5.
COMPRESSOR WILL NOT START.
Check that compressor or control circuit
breakers
Step
1.
or selector switch is properly set.
Reset
controls
properly.
Step
2.
Check if contacts of HIGH-or-LOW PRESSURE cut-out
switch are open.
Reset pressure switches.
Report
fault to direct
support maintenance if condition
continues.
Step
3.
Check for loose electrical connections
or
faulty
(See fig. 4-4 and para 4-20.)
wiring.
Tighten loose
connections.
Fix
wiring
if
necessary.
Step
4.
Make continuity check of control circuit
to
determine whether open circuit exists.
Fix
open
circuit
or
replace
wire.
Step
5.
Check continuity across primary and secondary
winding of control transformer for defective
(See para 4-31.)
windings.
Replace
bad
Step
6.
Check forward and reverse resistance
of
rectifier
(See para 4-31.)
assembly diodes.
Replace
bad
rectifier.
(See
Observe
operation
of
time
delay
Step
7.
Replace
bad
Substitute compressor relay known to
be
good,
and
Step
8.
(See para 4-28.)
check operation.
Replace
bad
4-33
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