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Page Title:
OPERATOR TROUBLESHOOTING PROCEDURES |
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 TM 9-4120-425-14&P
OPERATOR TROUBLESHOOTING PROCEDURES
THIS WORK PACKAGE COVERS:
Air Conditioner Fails To Operate, Insufficient Cooling, No Heat or Low Heat
INITIAL SETUP:
Maintenance Level
Operator
Table 1. Troubleshooting Procedures
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1.
AIR CONDITIONER FAILS TO
1.
Verify that power cable is
Connect power cable to receptacle.
OPERATE
connected to proper voltage and
See WP 0122-00 schematic diagram.
phase with receptacle J2 or J1
ALTERNATE.
See WP 0122-00 Schematic Diagram
2.
Verify that internal power
for proper power connection for
connections are for power
power receptacle being used.
receptacle being used (J2 or J1
ALTERNATE).
Reset circuit breaker.
3.
Check to be sure that
circuit breaker is ON.
Turn selector knob to desired
4.
Make sure that mode selector
operation.
switch is not in OFF position.
Reset pressure switch and wait for
5.
Check that high pressure switch
compressor to start.
has been reset.
Set switch to COOL.
2.
INSUFFICIENT COOLING
1.
Check to be sure that mode
selector switch is properly
positioned.
Adjust setting to COOLER.
2.
Make sure that temperature
switch is set correctly.
Open evaporator air intake louver
3.
Determine that sufficient air is
blades. Remove any obstructions from
passing across evaporator coil by
evaporator air intake and discharge
placing a piece of paper in front
louvers. Direct discharge air louvers
of the evaporator air intake
away from intake air. Refer to WP
louver. The paper should be held
against the louver blades by the
air.
Close or adjust fresh air damper door.
4.
Make sure that there is not too
much outside air entering unit.
If sight glass is not full and clean
5.
Check liquid sight indicator to
report to Direct Support Maintenance
see whether there is sufficient
Personnel.
refrigerant in the system.
0010-00-1
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