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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
75/84
Cx OffStartFailEvpPrLo
String in the alarm log:
Cx OffStartFailEvpPrLo
String in the alarm snapshot
Cx OffStartFailEvpPrLo
Circuit refrigerant charge is too low
Check refrigerant charge.
Check for gas leakage with a sniffer.
Reset
Notes
Local HMI
Network
Auto
6.6.12 Fan VFD Over Current (A/C units only)
This alarm indicates that the Inverter current has exceeded a safety limits and the inverter has to be stopped
in order to avoid damages to components.
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 OffVfdOverCurr
String in the alarm log:
CxCmp1 OffVfdOverCurr
String in the alarm snapshot
CxCmp1 OffVfdOverCurr
The ambient temperature is too high.
Check the unit selection to see if the unit
can operate at full load.
Check if all fans are operating properly and
are able to keep the condensing pressure
at the proper level.
Clean condenser coils to allow a lower
condensing pressure.
Reset
Notes
Local HMI
Network
Auto
6.6.13 High Discharge Temperature Alarm
This alarm indicates that the temperature at the discharge port of the compressor exceeded a maximum limit
which may cause damages to the mechanical parts of the compressor.
When this alarm occurs compressor’s crankcase and discharge pipes may become very hot.
Be careful when getting in contact with the compressor and discharge pipes in this condition.
Symptom
Cause
Solution
Circuit status is Off.
The compressor does not load anymore or
even unload, circuit is stopped.
Bell icon is moving on controller’s display.
String in the alarm list:
CxCmp1 OffDischTmpHi
String in the alarm log:
CxCmp1 OffDischTmpHi
String in the alarm snapshot
CxCmp1 OffDischTmpHi
Liquid Injection solenoid valve is not
operating properly.
Check the electrical connection between
the controller and the liquid injection
solenoid valve.
Check if the solenoid coil operates
properly
Check if the digital output operates
correctly.
Liquid injection orifice is small.
Check if when the liquid injection solenoid
is activated the temperature can be
controlled between the limits.
Check that the liquid injection line is not
obstructed by observing the discharge
temperature when it is activated.
Discharge temperature sensor could not
operate properly.
Check for proper operation of the
discharge temperature
Reset
Notes
Local HMI
Network
Auto
6.6.14 High Motor Current Alarm
This alarm indicates that the compressor absorbed current is exceeding a predefined limit.
Symptom
Cause
Solution