EWWQ090G ÷ EWWQ720L - R410a - Water-cooled scroll chillers
EWLQ090G ÷ EWLQ720L - R410a - Condenser less
EWHQ100G ÷ EWHQ400G - R410a - Heat pump scroll chillers
Water cooled scroll chillers & heat pump
Operation
Manual
Operation Manual
48
EWWQ - EWLQ - EWHQ
Water colled scroll chiller &heat pump
D-EOMWC01203-15EN
String in the alarm list:
+UnitOff EvpLvgWTempSen
String in the alarm log:
UnitOff EvpLvgWTempSen
String in the alarm snapshot:
UnitOff EvapLvgWTemp Sen
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 with electrical scheme.
6.1.2.3 Condenser Entering Water Temperature (CEWT) 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.
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 also
according with electrical scheme.
6.1.2.4 Condenser Leaving Water Temperature (CLWT) 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.
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
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 also
according with electrical scheme.
6.1.3 Unit Rapid Stop Alarms
6.1.3.1 Expansion module 1 (driver EXV circuit #1) communication fail alarm
This alarm is generated in case of communication problems with the EXV driver of circuit #1.
POL94E with address 3.
Symptom
Cause
Solution
Unit status is Off.
All circuits are stopped immediately.
Module has no power supply
Check the power supply from the
connector on the side of the module.