Carrier 69NT40-561-399 Operation And Service Manual page 76

AL17 COMPRESSOR PRESSURE DELTA FAULT
Cause: Compressor has attempted to start in both directions and fails to generate sufficient pressure dif-
ferential between SPT and DPT.
Component
Component
Component
Component
T-365
N/A
Troubleshooting Controller will attempt restart every 20 minutes and deactivate the
alarm if successful.
Corrective Action Resume normal operation.
Discharge Pressure Transducer (DPT)
Troubleshooting Confirm accurate DPT pressure readings, refer to MANIFOLD
GAUGE SET
Corrective Action Replace DPT if defective.
Suction Pressure Transducer (SPT)
Troubleshooting Confirm accurate SPT pressure readings, refer to MANIFOLD
GAUGE SET
Corrective Action Replace SPT if defective.
Monitor unit
Troubleshooting Alarm is display only the alarm may clear itself during operation.
Corrective Action If alarm remains active or is repetitive replace compressor at next
available opportunity.
Section 7.2.
Section 7.2.
4–42