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PROBLEM
"LOW SUCTION PRESSURE"
FAULT
"HIGH DISCHARGE
PRESSURE" FAULT
NOTE: If a mechanical high
pressure cut-out opens,
the system will shut down
on low motor current.
140
CAUSE
1. Improper suction pressure
cut-out adjustments.
2. Low refrigerant charge.
3. Fouled filter dryer.
4. EEV defective
5. Reduced flow of chilled
liquid through the cooler.
6. Defective suction pressure
transducer or faulty wiring.
1. Condenser fans not
operating or operating
backwards.
2. Too much refrigerant.
3. Air in refrigerant system.
4. Defective discharge
pressure transducer.
5. Assure outdoor ambient
sensor is reading correctly.
SOLUTION
1. Adjust per recommended
settings.
2. Repair leak if necessary
and add refrigerant.
3. Change dryer core.
4. Replace EEV.
5. Check GPM (See
OPERATION
LIMITATIONS)
Check operation of pump,
clean pump strainer, purge
chilled liquid system of air.
6. Replace transducer or
repair wiring.
1. Check fan motor, fuses,
and contactors.
Assure forward fan blow
air upward.
2. Remove refrigerant.
3. Evacuate and recharge
system.
4. Replace discharge
pressure transducer.
5. Verify displayed ambient
temperature is within
+ or - 15°F of
thermometer placed
next to sensor.
YORK INTERNATIONAL
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