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Page Title:
Table 1. Troubleshooting Procedures - Continued |
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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
3.
COMPRESSOR STARTS, BUT
1.
Leave the unit alone for one-
Wait.
STOPS AT ONCE OR AFTER
minute.
SHORT RUN PERIOD - Due To
Tripped Low Pressure Switch
2.
After one-minute see if
Wait and observe when low pressure
compressor comes on.
switch cuts out.
3.
Wait another one-minute.
If compressor does not come on,
perform continuity test on low
NOTE
pressure switch. Replace defective
switch (WP 0072-00).
Sequence of waiting and observ-
ing may occur several times
depending on temperature.
4.
COMPRESSOR STARTS, BUT
If overcharged, partially discharge the
1.
Perform pressure testing on
STOPS AT ONCE OR AFTER
system and retest. See WP 0049-00
system to determine if an
SHORT RUN PERIOD Due to
and WP 0055-00.
overcharge of refrigerant is
Tripped High Pressure Switch.
indicated. See WP 0055-00.
Replace bad motor or fan. (Refer to
2.
Check for proper operation of
condenser fan and motor.
Clean or remove obstruction or set
3.
Inspect condenser coil, intake
discharge louver to full open. See WP
grill and condenser discharge
louvers for dirt, obstructions or
closed discharge louver.
If operation of unit is satisfactory,
4.
Turn off power ; short-circuit
replace faulty high pressure switch.
("jumper") the high pressure
See WP 0072-00.
switch. Turn on power, wait one
minute for time delay to allow
compressor to start. Allow
compressor to run for a maximum
of 12 seconds to see whether
compressor operates normally.
CAUTION
Do not exceed 12- second operating
time for compressor as high
pressure may develop in the
refrigeration system that could
cause the pressure relief valve to
open or may result in damage to the
system.
5.
COMPRESSOR STARTS, BUT
1.
Check compressor current draw
If over specified current draw, replace
STOPS AT ONCE OR AFTER
at moment of trip.
faulty compressor. See WP 0076-00.
SHORT RUN PERIOD Due to
Tripping of Compressor Internal
2.
Check for proper operation of
If in excess of 25F (-3.88C) replace
Overload
refrigerant expansion valve
expansion valve. See WP 0074-00.
superheat at compressor suction.
0047-00-3
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