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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
73/84
Check for correct sensors wiring also
according electrical scheme.
Reset
Notes
Local HMI
Network
Auto
6.6.6
Economizer EXV Driver Error (A/C unit only)
This alarm indicates an abnormal condition of the Economizer EXV Driver.
Symptom
Cause
Solution
Circuit is stopped if the discharge
temperature reach the high limit value.
Bell icon is moving on controller’s display.
String in the alarm list:
Cx EcoEXVDrvError
String in the alarm log:
Cx OffEcoEXVDrvError
String in the alarm snapshot
Cx OffEcoEXVDrvError
Hardware Error
Contact your service organization to get
the problem solved.
Reset
Notes
Local HMI
Network
Auto
6.6.7
Economizer EXV Motor Not Connected (A/C unit only)
This alarm indicates an abnormal condition of the Economizer EXV Driver.
Symptom
Cause
Solution
Circuit is stopped if the discharge
temperature reach the high limit value.
Bell icon is moving on controller’s display.
String in the alarm list:
Cx EcoEXVMotor
String in the alarm log:
Cx EcoEXVMotor
String in the alarm snapshot
Cx EcoEXVMotor
Valve not connected.
Referring to the wiring diagram check if the
valve is correctly connected to the module.
Reset
Notes
Local HMI
Network
Auto
6.6.8
Evaporating Pressure sensor fault
This alarm indicates that the evaporating pressure transducer is not operating properly.
Symptom
Cause
Solution
Circuit status is Off.
The circuit is stopped.
Bell icon is moving on controller’s display.
String in the alarm list:
CxCmp1 EvapPressSen
String in the alarm log:
CxCmp1 EvapPressSen
String in the alarm snapshot
CxCmp1 EvapPressSen
Sensor is broken.
Check
for
sensor
integrity.
Check
correct
sensors
operation
according information about mVolt (mV)
range related to pressure values in kPa.
Sensor is shorted.
Check if sensor is shorted with a
resistance measurement.
Sensor is not properly connected (open).
Check for correct installation of the sensor
on refrigerant circuit pipe. The transducer
must be able to sense the pressure
through the
valve’s needle.