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Page Title:
Table 1. Troubleshooting Procedures |
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 TM 9-4120-425-14&P
DIRECT SUPPORT TROUBLESHOOTING PROCEDURES - Continued
0047-00
Table 1. Troubleshooting Procedures - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1.
COMPRESSOR WILL NOT
3.
Check continuity of compressor
Replace bad compressor or bad
START - Continued
motor, and the wiring to motor
wiring. (Refer to WP 0076-00.)
using multimeter. (Refer to WP
4.
Check continuity of HIGH and
1.
If continuity does not exist, press
LOW pressure switches at room
reset button and recheck.
temperature. Continuity should
exist. (Refer to WP 0072-00.)
2.
Replace faulty HIGH or LOW
pressure switch. (Refer to WP
5.
Check power input plugs (P2 or
Replace power input plug which does
P1 alternate) using multimeter at
not pass test. (Refer to WP 0043-00.)
TB1 as follows:
TB1
CONNECTOR
TERMINAL
PLUG PIN
(See Note)
A
1 or 4
B
2 or 5
C
3 or 6
E
GROUND
A to B should be 208 V ac
B to C should be 208 V ac
A to C should be 208 V ac
A to E should be 120 V ac
B to E should be 120 V ac
C to E should be 120 V ac
NOTE
When making test for voltage and
phase reading, TB1 terminals 4, 5
and 6 are used with P1 alternate
plug. Refer to WP 0122-00
schematic diagram.
2.
COMPRESSOR STARTS, BUT
1.
Check compressor for short to
Replace bad compressor or bad lead.
STOPS AT ONCE OR AFTER
ground.
(Refer to WP 0076-00.)
SHORT RUN PERIOD - Due To
Tripped Circuit Breaker
2.
Check circuit breaker by
Replace defective circuit breaker. See
observing amperes at moment of
trip.
0047-00-2
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