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Air and Water cooled inverter chillers and heat pump
D-EOMZC00105-17EN
Operation Manual
68/84
EWAD TZ - EWAD TZ B -EWWD VZ
Air and Water cooled inverter chillers and
heat pump
Circuit status is On.
The controller brings the compressor to
the minimum speed and then normal
operation is recovered (default 1200rmp)
Bell icon is moving on controller’s display.
String in the alarm list:
Cx FanAlm
String in the alarm log:
Cx FanAlm
String in the alarm snapshot
Cx FanAlm
Chiller main power supply had a down
peak which caused the trip.
Check if main power supply is within the
acceptable tolerance for this chiller
Reset
Notes
Local HMI
Network
Auto
6.5 Circuit Pumpdown Stop Alarms
6.5.1
Discharge 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:
CxCmp1 OffDischTmpSen
String in the alarm log:
CxCmp1 OffDischTmpSen
String in the alarm snapshot
CxCmp1 OffDischTmpSen
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 properly 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.
Reset
Notes
Local HMI
Network
Auto
6.5.2
Gas Leakage fault (A/C units only)
This alarm indicates a gas leakage in the compressor box.
Symptom
Cause
Solution
Circuit status is Off.
The circuit is switched off with the
shutdown procedure performing a deep
pumpdown of the circuit.
Bell icon is moving
on controller’s display.
String in the alarm list:
Cx OffGasLeakage
String in the alarm log:
Cx OffGasLeakage
String in the alarm snapshot
Cx OffGasLeakage
Gas leakage in the compressors box (A/C
units).
Switch off the unit and perform a gas
leakage test.
Gas Leakage in the plant room.
Check if there are leakage on the unit with
a detector eventually starting suction fans
to change the air in the room.
Gas leakage sensor fault.
Put the sensor in open air and check that
the alarm can be cleared. In case replace
the sensor or disable the option before
getting a new part.
Reset
Notes
Local HMI
Network
Auto