Trane SCWM Series Installation, Operation And Maintenance Manual page 78

Diagnostics
Table 22. Compressor alarming (continued)
HVAC Critical Alarm.
Diagnostic: Compressor (1-4) Suction Pressure Sensor Failure (In Fault)
Notification Class
HVAC Critical Alarm.
Diagnostic: Compressor (1-4) Suction Temperature Sensor Failure (In Alarm)
Notification Class
HVAC Critical Alarm.
78
Compressor will be locked The Pressure sensor is
out and prevented from calculated to be in fault and
running until this diagnostic is the unit has locked out the
cleared. compressor from operation.
Action
Compressor will be locked The Pressure sensor is
out and prevented from reading either above is
running until this sensor is in maximum value or below is
a normal state. minimum value, resulting in a
Fault Condition after 3 point
updates.
Action
Compressor will be locked The Temperature sensor is
out and prevented from calculated to be in fault and
running until this diagnostic is the unit has locked out the
cleared. compressor from operation.
• Sensor has lost its 5 Vdc
Source Signal. Verify
that the sensor has 5
Vdc.
• Sensor is not wired
properly: Verify wiring to
the XM Module.
• XM Module is not
communicating. Ensure
that the XM Module is
up and talking to the
UC600.
• System has no charge:
Verify that the system
has a refrigerant charge.
• Sensor has failed.
Typical Causes
Reason
• Sensor has lost its 5 Vdc
Source Signal. Verify
that the sensor has 5
Vdc.
• Sensor is not wired
properly: Verify wiring to
the XM Module.
• XM Module is not
communicating. Ensure
that the XM Module is
up and talking to the
UC600.
System has no
charge: Verify that
the system has a
refrigerant charge.
• Sensor has failed.
Typical Causes
Reason
• Sensor is not wired
properly: Verify wiring to
the XM Module.
• XM Module is not
communicating. Ensure
that the XM Module is
up and talking to the
UC600.
• Sensor has failed. Verify
if sensor has any
resistance on it, should
be 8-12k of resistance
on the thermistor.
Manual Reset required once
the sensor is in a Normal
State. User must toggle the
Compressor (1-4) Failure
Reset.
Reset Required
None, alarm clears once
sensor is in a normal state.
Reset Required
Manual Reset required once
the sensor is in a Normal
State. User must toggle the
Compressor (1-4) Failure
Reset.
PKG-SVX027D-EN