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Operation Manual
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10.5.2
Condenser Entering Water Temperature Sensor Fault
This alarm is generated any time the input resistance is out of an acceptable range.
Symptom
Cause
Solution
Unit status is Off.
All circuits are stopped with a normal
shutdown procedure.
Bell icon is moving on controller’s
display. String in the alarm list:
UnitOffCndEntWTempSen
String in the alarm log:
UnitOffCndEntWTempSen
String in the alarm snapshot
UnitOffcndEntWTempSen
Sensor is broken.
Check for sensor integrity. according
table and allowed kOhm (k ) range.
Check correct sensors operation.
Sensor is shorted.
Check if sensor is shorted with a
resistance measurement.
Sensor is not properly connected
(open).
Check for absence of water or
humidity on electrical contacts.
Check for correct plug-in of the
electrical connectors.
Check for correct sensors wiring also
according electrical scheme.
Reset
Notes
Local HMI
Network
Auto
10.5.3
Evaporator Water Temperatures inverted
This alarm is generated any time the entering water temperature is lower than the leaving by 1°C and at least one
compressor is running for 90 seconds.
Symptom
Cause
Solution
Unit status is Off.
All circuits are stopped with a normal
shutdown precedure.
Bell icon is moving on controller’s
display. String in the alarm list:
UnitOffEvpWTempInvrtd String in
the alarm log:
UnitOffEvpWTempInvrtd
String in the alarm snapshot
UnitOffEvpWTempInvrtd
Entering and leaving water
temperature sensors are inverted.
Check cabling of the sensors on the
unit controller.
Check offset of the two sensors with
the water pump running.
Entering and leaving water pipes are
reversed.
Check if the water flows in counter
flow respect to refrigerant.
Water pump operate reverse.
Check if the water flows in counter
flow respect to refrigerant.
Reset
Notes
Local HMI
Network
Auto
10.5.4
Condenser Water Temperatures inverted
This alarm is generated any time the entering water temperature is lower than the leaving by 1°C and at least one
compressor is running for 90 seconds.
Symptom
Cause
Solution
Unit status is Off.
All circuits are stopped with a normal
shutdown procedure.
Bell icon is moving on controller’s
display. String in the alarm list:
UnitOffCndWTempInvrtd
String in the alarm log:
UnitOfFCndWTempInvrtd
String in the alarm snapshot
UnitOffCndWTempInvrtd
Entering and leaving water
temperature sensors are inverted.
Check cabling of the sensors on the
unit controller.
Check offset of the two sensors with
the water pump running.
Entering and leaving water pipes are
reversed.
Check if the water flows in counter
flow respect to refrigerant.
Water pump operate reverse.
Check if the water flows in counter
flow respect to refrigerant.
Reset
Notes
Local HMI
Network
Auto
10.5.5
HP Module Communication Failure
This alarm is generated in case of communication problems with the HP module.
