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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
6.
INSUFFICIENT COOLING
1.
Feel filter-drier to see whether it
If so, replace filter-drier. (Refer to WP
is cold to the touch, or is frosted
or sweating.
2.
Check evaporator coil for overall
If part of coil is relatively warm and
temperature.
evaporator inlet is sweaty or frosty,
expansion valve or distributor may be
obstructed or damaged. (Refer to WP
3.
Check liquid sight indicator for
Recharge system after checking for
bubbles or cloudiness, which
and repairing leaks. (Refer to WP
indicates insufficient refrigerant.
4.
Check for high suction and low
Replace faulty compressor. (Refer to
discharge pressure to see whether
compressor is pumping. (Refer to
Table 1, WP 0055-00.)
5.
Check for high discharge
Bleed off excess refrigerant.
pressure. (Refer to Table 1, WP
7.
COMPRESSOR RUNS BUT
1.
Check for continuity of
Replace defective switch (Refer to
DOES NOT COOL
temperature selector switch and
thermostat (in "COOL" mode).
2.
Check electrical rotation of
Refer to schematic diagram (WP
power supply- must be A-B-C for
proper compressor rotation.
3.
Check for excessively high
1.
Close doors, windows or other
temperature in conditioned area.
openings.
2.
Insulate areas of high heat gain.
4.
Check compressor for noisy
Replace compressor. (Refer to WP
operation, high suction pressure
or excessively low discharge
pressure indicating leaky internal
valves. (Refer to WP 0055-00
and Table 1, WP 0055-00.)
5.
Check liquid sight indicator for
1.
Repair leaks or replace leaking
bubbles indicating low charge of
component.
refrigerant.
2.
Recharge system. (Refer to WP
0047-00-4
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