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Page Title:
COMPRESSOR WILL NOT START. (Cont) |
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 TM5-4120-383-14
Table 4-2.
TROUBLESHOOTING-Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Check if contacts of HIGH-or-LOW PRESSURE cut-out
Step 2.
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.
Make continuity check of control circuit to
Step 4.
determine whether open circuit exists.
Fix open circuit or replace wire.
Check continuity across primary and secondary
Step 5.
winding of control transformer for defective
windings. (See para 4-32.)
Replace bad transformer.
Check forward and reverse resistance of rectifier
Step 6.
(See para 4-32.)
assembly diodes.
Replace bad rectifier.
(See para
Step 7.
Observe operation of time delay relay.
Replace bad relay.
Substitute compressor relay known to be good, and
Step 8.
(See para 4-29.)
check operation.
Replace bad relay.
Test compressor motor by checking continuity of the
Step 9.
following pins at the compressor electrical
(See fig. 4-4 for pin
receptacle.
identifications.)
(1) Pins A and B, B and C, and C and A.
Continuity should exist.
4-33
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