6.13 Autotransformer Malfunction; 6.14 Water-Cooled Condenser Or Water Pressure Switch; 6.15 Compressor Operating In Reverse - Carrier PrimeLINE 69NT40-561-200 Operation And Service Manual

CONDITION
High suction pressure with
low superheat
Liquid slugging in
compressor

6.13 AUTOTRANSFORMER MALFUNCTION

Unit will not start

6.14 WATER-COOLED CONDENSER OR WATER PRESSURE SWITCH

High discharge pressure
Condenser fan starts and
stops

6.15 COMPRESSOR OPERATING IN REVERSE

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
POSSIBLE CAUSE
Foreign material in valve
Failed suction pressure transducer (SPT) or evapora-
tor pressure transducer (EPT)
EEV control malfunction
Improperly seated powerhead
Failed suction pressure transducer (SPT) or evapora-
tor pressure transducer (EPT)
Failed EEV
Circuit breaker (CB-1 or CB-2) tripped
Autotransformer defective
Power source not turned ON
460 VAC power plug is not inserted into the receptacle
Dirty coil
Non-condensibles
Water pressure switch malfunction
Water supply interruption
NOTE
CAUTION
!
Incorrect wiring of compressor
Incorrect wiring of compressor contactor(s)
Incorrect wiring of current sensor
6–5
REMEDY/REFERENCE
SECTION
Section 7.19
Replace
Replace
Ensure powerhead is
locked and in place
Replace
Replace
Check
Section 7.26
Check
Section 5.2.2
Section 7.13
Check
Check
Check
T-362