Air and Water cooled inverter chillers and heat pump
D-EOMZC00105-17EN
Operation Manual
70/84
EWAD TZ - EWAD TZ B -EWWD VZ
Air and Water cooled inverter chillers and
heat pump
6.5.6
Low Oil Level fault (W/C units only)
This alarm indicates that the oil level inside the oil separator has become too low to allow for a safe operation
of the compressor.
This switch may not be installed on the unit because in regular operations the oil separation is always granted.
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 OffOilLevelLo
String in the alarm log:
CxCmp1 OffOilLevelLo
String in the alarm snapshot
CxCmp1 OffOilLevelLo
Oil Level switch not operating correctly.
Check the cabling between switch and
controller feedback and power
Check if switch operates correctly.
Check if digital input of the controller
operates correctly.
Check the oil charge
Verify if there is enough oil inside the
circuit.
Reset
Notes
Local HMI
Network
Auto
6.5.7
Low Discharge Superheat fault
This alarm indicates that the unit has worked for too long with low discharge super heat.
Symptom
Cause
Solution
Circuit status is Off.
The circuit is switched off with the
shutdown procedure.
Bell icon is moving on controller’s display.
String in the alarm list:
CxCmp1 OffDishSHLo
String in the alarm log:
CxCmp1 OffDishSHLo
String in the alarm snapshot
CxCmp1 OffDishSHLo
EEXV is not working correctly.
It’s not opening enough or it’s moving in
the opposite direction.
Check if pump-down can be finished for
pressure limit reached;
Check expansion valve movements.
Check connection to the valve driver on the
wiring diagram.
Measure the resistance of each winding, it
has to be different from 0 Ohm.
Reset
Notes
Local HMI
Network
Auto
x 2 attempts (W/C only)
6.5.8
Oil Pressure 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 OffOilFeedPSen
String in the alarm log:
CxCmp1 OffOilFeedPSen
String in the alarm snapshot
CxCmp1 OffOilFeedPSen
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.
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