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6–7
T-365
6.14 COMPRESSOR OPERATING IN REVERSE
Condition
Possible Cause
Remedy/Refer-
ence Section
NOTICE
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
6.15 ABNORMAL TEMPERATURES
Condition
Possible Cause
Remedy/Refer-
ence Section
High discharge temperature
Gas Cooler coil dirty
Gas Cooler fan rotating backwards
Gas Cooler fan inoperative
Refrigerant overcharge or non-condensibles
Discharge service valve partially closed
Open
Electronic expansion valve (EEV) control malfunction
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
6.16 ABNORMAL CURRENTS
Condition
Possible Cause
Remedy/Refer-
ence Section
Unit reads abnormal currents
Current sensor wiring
Check
Summary of Contents for 69NT40-561-300
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Page 164: ...T 365 8 2 Figure 8 2 Unit Wiring Diagram Based on Drawing 62ï11755 ...
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