EWWQ090G ÷ EWWQ720L - R410A - Water-cooled scroll chillers
EWLQ090G ÷ EWLQ720L - R410A - Condenser less
EWHQ100G ÷ EWHQ400G - R410A - Heat pump scroll chillers
EWAQ-G 075
- R410A - Air-cooled scroll chillers
EWAQ-
- R410A - Air-cooled scroll chillers
EWYQ-
- R410A - Air-cooled scroll heat pumps
Air and Water cooled scroll chillers & heat pump
Operation
Manual
Operation Manual
68
EWWQ - EWLQ - EWHQ
EWAQ - EWYQ
Air or Water cooled scroll chiller &
heat pump
D-EOMHW00107-15EN
6.1.2.3 Condenser Entering Water Temperature (CEWT) sensor fault (W/C only)
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.
Led on the button 2 of External HMI is
blinking
String in the alarm list:
+UnitOff CndEntWTempSen
String in the alarm log:
UnitOff CndEntWTempSen
String in the alarm snapshot:
UnitOff CndEntWTemp Sen
Sensor is broken.
Check for sensor integrity.
Check correct sensors operation
according information about kOhm
kOhm (k
) range related to
temperature values.
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
according with wiring diagram.
6.1.2.4 Condenser Leaving Water Temperature (CLWT) sensor fault (W/C only)
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.
Led on the button 2 of External HMI is
blinking
String in the alarm list:
+UnitOff CndLvgWTempSen
String in the alarm log:
UnitOff CndLvgWTempSen
String in the alarm snapshot:
UnitOff CndLvgWTemp Sen
Sensor is broken.
Check for sensor integrity.
Check correct sensors operation
according information about kOhm
(k
) range related to temperature
values.
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
according with wiring diagram.
6.1.2.5 Outside Air Temperature (OAT) sensor fault (A/C only)
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.
Led on the button 2 of External HMI is
blinking
String in the alarm list:
+UnitOff AmbTempSen
String in the alarm log:
UnitOff AmbTempSen
String in the alarm snapshot:
UnitOff AmbTemp Sen
Sensor is broken.
Check for sensor integrity.
Check correct sensors operation
according information about kOhm
(k
) range related to temperature
values.
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
according with wiring diagram.
