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Air and Water cooled inverter chillers and heat pump
EWAD TZ - EWAD TZ B - EWWD VZ
Air and Water cooled inverter chillers
and heat pump
D-EOMZC00105-17EN
Operation Manual
59/84
Local HMI
Network
Auto
6.2 Unit Pumpdown Stop Alarms
6.2.1
Condenser Entering Water Temperature (EWT) 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
6.2.2
Condenser Leaving Water Temperature (LWT) 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:
UnitOffCndLvgWTempSen
String in the alarm log:
UnitOffCndLvgWTempSen
String in the alarm snapshot
UnitOffcndLvgWTempSen
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
6.2.3
Evaporator Entering Water Temperature (EWT) 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:
UnitOffEvpEntWTempSen
String in the alarm log:
UnitOffEvpEntWTempSen
String in the alarm snapshot
UnitOffEvpEntWTempSen
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.