T-362 6–6
Liquid slugging in
compressor
Failed suction pressure transducer (SPT) or
evaporator pressure transducer (EPT)
Replace
Failed EEV Replace
6.13 Autotransformer Malfunction
Unit will not start
Circuit breaker (CB-1 or CB-2) tripped Check
Autotransformer defective Section 7.26
Power source not turned ON Check
460 VAC power plug is not inserted into the receptacle Section 5.2.2
6.14 Water-Cooled Condenser or Water Pressure Switch
High discharge pressure
Dirty coil
Section 7.13
Non-condensibles
Condenser fan starts and
stops
Water pressure switch malfunction Check
Water supply interruption Check
6.15 Compressor Operating in Reverse
NOTE
The compressor may start in reverse for up to 10 seconds to determine correct phase rotation
if required for phase detection.
Allowing the scroll compressor to operate in reverse for more than two minutes will result in
internal compressor damage. Turn the start- stop switch OFF immediately.
Electrical
Incorrect wiring of compressor
CheckIncorrect wiring of compressor contactor(s)
Incorrect wiring of current sensor
6.16 Abnormal Temperatures
High discharge temperature
Condenser coil dirty Section 7.11.1
Condenser fan rotating backwards Section 7.12
Condenser fan inoperative Section 7.12.1
Refrigerant overcharge or non-condensibles Section 7.3
Discharge service valve partially closed Open
Electronic expansion valve (EEV) control malfunction Replace
Failed suction pressure transducer (SPT) or
evaporator pressure transducer (EPT)
Replace
Discharge temperature sensor drifting high Replace
Failed economizer expansion valve, economizer coil,
or economizer solenoid valve
Replace
Plugged economizer expansion valve, economizer
coil, or economizer solenoid valve
Replace
Loose or insufficiently clamped sensor Replace
6.17 Abnormal Currents
Unit reads abnormal currents Current sensor wiring Check
Condition Possible Cause Remedy / Reference
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