Air and Water cooled inverter chillers and heat pump
D-EOMZC00105-17EN
Operation Manual
74/84
EWAD TZ - EWAD TZ B -EWWD VZ
Air and Water cooled inverter chillers and
heat pump
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 electrical scheme.
Reset
Notes
Local HMI
Network
Auto
6.6.9
EXV Driver Error (A/C units only)
This alarm indicates an abnormal condition of the EXV Driver.
Symptom
Cause
Solution
Circuit status is Off.
Circuit is immediately stopped.
Bell icon is moving on controller’s display.
String in the alarm list:
Cx OffEXVDrvError
String in the alarm log:
Cx OffEXVDrvError
String in the alarm snapshot
Cx OffEXVDrvError
Hardware Error
Contact your service organization to get
the problem solved.
Reset
Notes
Local HMI
Network
Auto
6.6.10 EXV Motor Not Connected (TZ B units only)
This alarm indicates an abnormal condition of the EXV Driver.
Symptom
Cause
Solution
Circuit status is Off.
Circuit is immediately stopped.
Bell icon is moving on controller’s display.
String in the alarm list:
Cx OffEXVMotor
String in the alarm log:
Cx OffEXVMotor
String in the alarm snapshot
Cx OffEXVMotor
Valve not connected.
Referring to the wiring diagram check if the
valve is correctly connected to the module.
Reset
Notes
Local HMI
Network
Auto
6.6.11 Fail Start Low Pressure
This alarm indicates that at the compressor start the evaporating pressure or condensing pressure is below a
minimum fixed limit at compressor start.
Symptom
Cause
Solution
Circuit status is Off.
The circuit is stopped.
Bell icon is moving on controller’s display.
String in the alarm list:
Ambient temperature is too low (A/C units)
or water temperature is too low (W/C units)
Check the operating envelope for this
machine.