EWWQ090G ÷ EWWQ720L - R410A - Water-cooled scroll chillers
EWLQ090G ÷ EWLQ720L - R410A - Condenser less
EWHQ100G ÷ EWHQ400G - R410A - Heat pump scroll chillers
EWAQ-
- 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
EWWQ - EWLQ - EWHQ
EWAQ - EWYQ
Air or Water cooled scroll chiller &
heat pump
D-EOMHW00107-15EN
Operation Manual
75
Cx FailedPumpdownHiPr
String in the alarm snapshot:
Cx FailedPumpdownHiPr
6.1.6 Circuit Pumpdown Stop Alarms
The circuit is stopped with the normal pumpdown procedure. It will not be allowed to start again
until the root-cause of the alarm is fixed.
6.1.6.1 Suction Temperature Sensor fault
This alarm is generated to indicate that the sensor is not reading properly.
Symptom
Cause
Solution
Circuit status is Off.
The circuit is switched off with the
normal shutdown procedure.
Bell icon is moving on
controller’s
display.
String in the alarm list:
+CxOff SuctTempSen
String in the alarm log:
CxOff SuctTempSen
String in the alarm snapshot:
CxOff SuctTemp Sen
Sensor is shorted.
Check for sensor integrity.
Check correct sensors operation
according information about kOhm
(k
) range related to temperature
values.
Sensor is broken.
Check if sensor is shorted with a
resistance measurement.
Sensor is not good connected (open).
Check for correct installation of the
sensor on refrigerant circuit pipe.
Check for absence of water or
humidity on sensor electrical contacts.
Check for correct plug-in of the
electrical connectors.
Check for correct sensors wiring also
according with electrical scheme.
6.1.6.2 Discharge Temperature Sensor fault (A/C only)
This alarm is generated to indicate that the sensor is not reading properly.
Symptom
Cause
Solution
Circuit status is Off.
The circuit is switched off with the
normal shutdown procedure.
Bell icon is moving
on controller’s
display.
String in the alarm list:
+CxOff DischTempSen
String in the alarm log:
CxOff DischTempSen
String in the alarm snapshot:
CxOff DischTemp Sen
Sensor is shorted.
Check for sensor integrity.
Check correct sensors operation
according information about kOhm
(k
) range related to temperature
values.
Sensor is broken.
Check if sensor is shorted with a
resistance measurement.
Sensor is not good connected (open).
Check for correct installation of the
sensor on refrigerant circuit pipe.
Check for absence of water or
humidity on sensor electrical contacts.
Check for correct plug-in of the
electrical connectors.
Check for correct sensors wiring also
according with electrical scheme.
6.1.7 Circuit Rapid Stop Alarms
The circuit is immediately stopped to prevent damages to the components. The circuit will not be
allowed to run again until the root-cause of the alarm is fixed.
6.1.7.1 EXV drive circuit #1/#2 communication fail alarm (A/C only)
This alarm is generated in case of communication problems with the EXV driver of circuit #1 or
circuit #2 identified respectively with labels EEXV-1 and EEXV-2.
