Compressor Operating In Reverse; Abnormal Temperatures; Abnormal Currents - Carrier 69NT40-551-500 Operation And Service

5.14 COMPRESSOR OPERATING IN REVERSE

It is normal for the compressor to run in reverse for 15 seconds when the compressor has been off
for 6 hours or more.
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

5.15 ABNORMAL TEMPERATURES

High discharge temperature
Low suction temperature

5.16 ABNORMAL CURRENTS

Unit reads abnormal currents
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CONDITION
Incorrect wiring of compressor
Incorrect wiring of compressor contactor(s)
Incorrect wiring of current sensor
Discharge temperature sensor drifting high
Failed economizer, TXV or solenoid valve
Plugged economizer, TXV or solenoid valve
Loose or insufficiently clamped sensor
Discharge temperature sensor drifting low
Loose or insufficiently clamped sensor
Liquid injection valve failure
Current sensor wiring
search engine
POSSIBLE CAUSE
NOTE
CAUTION
5--5
REMEDY/
REFERENCE
SECTION
Check
Replace
Replace
Replace
Replace
Replace
Replace
Replace
Check
T-334