Carrier 69NT40-541-500 Operation And Service Manual page 75

AL63 CURRENT LIMIT
Component
Troubleshooting Check current limit setting Code Cd32.
Corrective Action The current limit can be raised (maximum of 23 amps) using Cd32.
AL64 DISCHARGE TEMPERATURE SENSOR (CPDS)
Cause: Discharge Temperature sensor out of range.
Component
Troubleshooting Test the CPDS. Refer to Temperature Sensor Service,
Corrective Action Replace the CPDS if defective. Refer to Temperature Sensor Service,
AL65 DISCHARGE PRESSURE TRANSDUCER (DPT)
Cause: Compressor Discharge Transducer is out of range.
Component
Troubleshooting Confirm accurate DPT pressure readings. Refer to Manifold Gauge Set,
Corrective Action Replace DPT if defective.
AL66 (SPT) SUCTION PRESSURE TRANSDUCER, (EPT) EVAPORATOR PRESSURE TRANSDUCER
Cause: Suction Pressure Transducer (SPT) out of range.
Component
Troubleshooting Confirm accurate EPT and SPT pressure readings. Refer to Manifold
Corrective Action Replace EPT/SPT if defective.
Component
Troubleshooting Monitor
Corrective Action If the alarm persists, it may indicate a failing compressor. Refer to Com-
AL67 HUMIDITY SENSOR
Cause: Humidity Sensor (HS) reading out of range.
Component
Troubleshooting Make sure the humidity sensor is properly connected in the socket and the
Corrective Action Monitor, replace HS if alarm persists.
Current limit set too low
Discharge temperature sensor (CPDS)
tion 7.21.
Compressor Discharge Transducer (DPT)
Section 7.2.
Suction Pressure Transducer (SPT)
Gauge Set, Section 7.2.
Performing a Pre-trip 5-9 test will also check the transducers.
Suction Pressure Transducer (SPT)
pressor Service, Section
Humidity Sensor (HS)
wires have not been dam aged.
4–43
7.8.
Section 7.21.
Sec-
T-363