Carrier PrimeLINE 69NT40-561-200 Operation And Service Manual page 86

AL65 DISCHARGE PRESSURE TRANSDUCER (DPT)
Cause: Compressor Discharge Pressure Transducer is out of range.
Component
AL66 (SPT) SUCTION PRESSURE TRANSDUCER, (EPT) EVAPORATOR PRESSURE TRANSDUCER
Cause: Suction Pressure Transducer (SPT) out of range.
Component
AL67 HUMIDITY SENSOR
Cause: Humidity Sensor (HS) reading out of range.
Component
AL69 EVAPORATOR TEMP SENSOR (ETS1)
Cause: Evaporator Temperature Sensor (ETS1) out of range.
Component
AL70 SECONDARY SUPPLY SENSOR (SRS)
Cause: Secondary Supply Sensor (SRS) is out of range.
Component
T-362
Discharge Pressure Transducer (DPT)
Troubleshooting Confirm accurate DPT pressure readings. Refer to Manifold Gauge
Set Section
Corrective Action Replace DPT if defective.
Suction Pressure Transducer (SPT)
Troubleshooting Confirm accurate EPT and SPT pressure readings. Refer to Manifold
Gauge Set
- Performing a pre-trip 5-9 test will also check the transducers.
Corrective Action Replace EPT/SPT if defective.
Troubleshooting Monitor
Corrective Action If the alarm persists, it may indicate a failing compressor. Refer to
Compressor Service
Humidity Sensor (HS)
Troubleshooting Make sure the humidity sensor is properly connected in the socket.
Make sure the humidity sensor wires have not been damaged.
Refer to
Corrective Action Monitor, replace HS if alarm persists.
Evaporator Temperature Sensor (ETS1)
Troubleshooting Test the ETS1. Refer to Sensor Checkout Procedure
Corrective Action Replace Evaporator Temperature Sensor (ETS1) if defective.
Secondary Supply Sensor (SRS)
Troubleshooting Perform pre-trip P5.
Corrective Action If P5 passes, no further action is required.
Corrective Action If P5 fails, replace the defective sensor as determined by P5. Refer
to Temperature Sensor Service
7.2.
Section 7.2.
Section 7.9.
Section 7.20 to test operation of Humidity Sensor.
Section
4–48
Section 7.28.1.
7.28.