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Operation Manual
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10.4.7
Leaving Evaporator Water Temperature Sensor Fault
This alarm is generated any time that 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:
UnitOffLvgEntWTempSen
String in the alarm log:
UnitOffLvgEntWTempSen
String in the alarm snapshot
UnitOffEvpLvgWTempSen
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
10.4.8
External Alarm
This alarm is generated to indicate that an external device whose operation is linked with this unit operation. This
external device could be a pump or an inverter.
Symptom
Cause
Solution
Unit status is Off.
All circuits are switched off with the
normal shutdown procedure.
Bell icon is moving on controller’s
display. String in the alarm list:
UnitOffExternalAlarm
String in the alarm log:
UnitOffExternalAlarm
String in the alarm snapshot
UnitOffExternalAlarm
There is an external event that has
caused the opening, for at least 5
seconds, of the port on the controller
board.
Check causes of the external event or
alarm.
Check electrical wiring from unit
controller to the external equipment
in case of any external events or
alarms have been occurred.
Reset
Notes
Local HMI
Network
Auto
NOTE: What above applies in case of configuration of the external fault digital input as Alarm.
10.4.9
Gas Leakage alarm
This alarm is generated when the external leak detector(s) detects a refrigerant concentration higher that a threshold. To
clear this alarm is required to clear the alarm either locally and, if needed, on the leak detector itself.
Symptom
Cause
Solution
Unit status is Off.
All circuits are stopped immediately.
Bell icon is moving on controller’s
display. String in the alarm list:
UnitOffGasLeakage
String in the alarm log:
UnitOffGasLeakage
String in the alarm snapshot
UnitOffGasLeakage
Refrigerant leakage
Locate the leakage with a sniffer and
fix the leakage.
Leak detector is not properly powered
Check the power supply of the leak
detector.
Leak detector is not properly
connected to the controller.
Check the connection of the detector
with reference to the wiring diagram
of the unit.
Leak detector is broken
Replace the leak detector.
Leak detector is not required/needed
Check the configuration on the unit
controller and disable this option.
Reset
Notes
Local HMI
Network
Auto
