AirMan PDS185S-6C1, Service Manual

Page: 67 / 79

4. Troubleshooting
4-11
4.3 Operation of emergency switch
4.3.1 Discharge air temperature warning lamp glows and engine stops.
Abnormal
More than
104°F (40
℃
)
Faulty controller
Lower than 104°F (40
℃
)
More than
248°F(120
℃
)
Exists
Normal
Check
indication of
discharge air
temperature
gauge.
4
Check resistance
of discharge air
temperature
sensor.
5
Check electric
conductance
between controller
and sensor.
6
Relocation
Replace it.
Repair wire
connection.
Repair it.
No
conduction
exists.
Unsuitable place of
installation.
Faulty by-pass valve.
Replace it.
Faulty compressor air
end.
Repair.
More than
176°F(80
℃
)
Lower than 176°F(80
℃
)
Shortage of oil.
Replenish or replace.
Check fan belt tension.
Tension not acceptable
or faulty belt.
Check compressor oil filter.
Filter clogging.
Replace it.
Proper
Faulty
Fin tubes much soled.
Soiled
Wash / clean
Normal
Normal
Normal
Faulty
Adjust or replace
Check oil temperature at
outlet of compressor oil filter.
Check compressor oil level.
Disconnection
between
controller and
sensor.
Lower than
248°F
(120
℃
)
Faulty sensor.
Check oil cooler fin tubes.
Check ambient temperature.
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