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Page Title:
Table 1. Unit Troubleshooting Procedures |
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 TM 9-4120-425-14&P
UNIT TROUBLESHOOTING - Continued
0014-00
Table 1. Unit Troubleshooting Procedures
MALFUNCTION
TEST OR INSPECT
CORRECTIVE ACTION
NOTE
Before using this table, be sure you have performed all applicable operating checks.
1.
AIR CONDITIONER FAILS TO
1.
Check to see that main power
Connect cable.
OPERATE
cable is connected to air
conditioner and power source.
2.
Make sure that you are using the
Check line voltage with multimeter
correct voltage and phase.
for 208 V ac, three-phase, 50/60 Hz
power.
3.
Inspect main power receptacle
Replace connector. (Refer to WP
connections for breaks.
Tighten connections.
4.
Check for loose electrical
connections.
Turn selector switch to COOL or
5.
Inspect rotary selector switch for
VENTILATE.
incorrect setting. (See Table Of
Operator Control Settings.)
1.
Reset circuit breaker
6.
Check to see whether CIRCUIT
BREAKER is in the OFF position
2.
Make continuity check with
or is defective.
multimeter. Refer to WP 0033-
If windings do not show continuity or
7.
Disconnect control circuit
if windings-to-case continuity exists,
transformer and make continuity
replace transformer. (Refer to WP
check of primary and secondary
windings, and from windings-to-
case, using ohmmeter
Turn selector switch to COOL.
2.
INSUFFICIENT COOLING
1.
Check to see that Mode Selector
switch is properly positioned.
Report condition to Direct Support
2.
Check liquid sight indicator level
Maintenance personnel.
to see that refrigerant is colorless
and clear. Yellow indicates
moisture in system. Milky or
bubbly refrigerant indicates low
level refrigerant charge.
3.
Inspect condenser coil for dirt.
Clean coil with 25-30 psi (1.76-2.11
kg/cm2) compressed air.
4.
Inspect evaporator air intake filter
Clean filter.
for dirt.
0014-00-3
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