Trane SCWM Series Installation, Operation And Maintenance Manual page 80

Diagnostics
Table 22. Compressor alarming (continued)
HVAC Critical Alarm.
Diagnostic: Compressor (1-4) Frostat (In Alarm)
Notification Class
HVAC Critical Alarm.
Diagnostic: Compressor (1-4) High Superheat (In Alarm)
Notification Class
HVAC Critical Alarm.
Diagnostic: Compressor (1-4) Low Superheat (In Alarm)
Notification Class
80
The High Pressure cutout The temperature sensor is
switch is reading a closed reading either above is
condition which indicates. maximum value or below is
minimum value, resulting in
an Alarm Condition after 3
point updates.
Action
Compressor will be locked The Calculated Saturated
out and prevented from Suction Refrigerant
running until this diagnostic is Temperature is below 32
cleared. degrees for 5 minutes.
Action
Compressor will be locked The Calculated superheat is
out and prevented from above 25 degrees for 10
minutes.
running until this diagnostic is
cleared.
Action
• 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.
• Discharge Pressure is
too high and over the
cutout threshold of the
High Pressure Switch.
Verify Condenser
Pressure.
• Cutout Switch has
failed.
Typical Causes
Reason
• Low Airflow across the
Evaporator.
• Partially blocked
Evaporator.
• Dirty Air Filter.
• Dirty Evaporator Coil.
Typical Causes
Reason
• Low Charge on unit.
• Malfunctioning TXV.
• Too high of a heat load.
• Too much air across the
evaporator.
Typical Causes
Reason
None, alarm clears once
sensor is in a normal state.
Reset Required
Manual Reset required once
the issue is resolved. User
must toggle the Compressor
(1-4) Failure Reset.
Reset Required
Manual Reset required once
the issue is resolved. User
must toggle the Compressor
(1-4) Failure Reset.
Reset Required
PKG-SVX027D-EN