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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
Power source not turned ON
Check
460 VAC power plug is not inserted into the receptacle
6.14 Water-Cooled Condenser or Water Pressure Switch
High discharge pressure
Dirty coil
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.
CAUTION
!
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
Check
Incorrect wiring of compressor contactor(s)
Incorrect wiring of current sensor
6.16 Abnormal Temperatures
High discharge temperature
Condenser coil dirty
Condenser fan rotating backwards
Condenser fan inoperative
Refrigerant overcharge or non-condensibles
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
Summary of Contents for PrimeLINE 69NT40-561-200
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Page 184: ...T 362 8 2 ELECTRICAL WIRING SCHEMATIC AND DIAGRAMS Figure 8 2 Schematic Diagram ...