T-362 4–40
AL65 Discharge Pressure Transducer (DPT)
Cause: Compressor Discharge Pressure Transducer (DPT) is out of range.
Component Compressor Discharge Pressure Transducer (DPT)
Troubleshooting Confirm accurate DPT pressure readings. See Manifold Gauge Set Section 7.2.
Corrective Action Replace DPT if defective.
AL66 Suction Pressure Transducer (SPT), Evaporator Pressure Transducer (EPT)
Cause: Suction Pressure Transducer (SPT) out of range.
Component Suction Pressure Transducer (SPT)
Troubleshooting Confirm accurate EPT and SPT pressure readings. See Manifold Gauge Set
Section 7.2.
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. See Compressor
Service Section 7.9.
AL67 Humidity Sensor
Cause: Humidity Sensor (HS) reading out of range.
Component Humidity Sensor (HS)
Troubleshooting Make sure the HS is properly connected in the socket.
Make sure the HS wires have not been damaged.
See Section 7.20 to test operation of Humidity Sensor.
Corrective Action Monitor, replace HS if alarm persists.
AL69 Evaporator Temp Sensor (ETS1)
Cause: Evaporator Temperature Sensor (ETS1) out of range.
Component Evaporator Temperature Sensor (ETS1)
Troubleshooting Test the ETS1. See Sensor Checkout Procedure Section 7.29.2.
Corrective Action Replace Evaporator Temperature Sensor (ETS1) if defective.
AL70 Secondary Supply Sensor (SRS)
Cause: Secondary Supply Sensor (SRS) is out of range.
Component 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. See Temperature
Sensor Service Section 7.29.
AL71 Secondary Return Sensor (RRS)
Cause: Secondary Return Sensor (RRS) is out of range.
Component Secondary Return Sensor (RRS)
Table 4–5 Alarm Indications and Descriptions
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