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Air and Water cooled inverter chillers and heat pump
D-EOMZC00105-17EN
Operation Manual
62/84
EWAD TZ - EWAD TZ B -EWWD VZ
Air and Water cooled inverter chillers and
heat pump
String in the alarm snapshot
UnitOffEmergencyStop
Reset
Notes
Local HMI
Network
Auto
Please see note on the top.
6.3.4
Evaporator Flow Loss alarm
This alarm is generated in case of flow loss to the chiller to protect the machine against freezing.
Symptom
Cause
Solution
Unit status is Off.
All circuits are stopped immediately.
Bell icon is moving on controller’s display.
String in the alarm list:
UnitOffEvapWaterFlow
String in the alarm log:
UnitOffEvapWaterFlow
String in the alarm snapshot
UnitOffEvapWaterFlow
No water flow sensed for 3 minutes
continuously or water flow too low.
Check the water pump filler and the water
circuit for obstructions.
Check the flow switch calibration and
adapt to minimum water flow.
Check if pump impeller can rotate freely
and has no damages.
Check pumps protection devices (circuit
breakers, fuses, inverters, etc.)
Check if water filter is clogged.
Check flow switch connections.
Reset
Notes
Local HMI
Network
Auto
6.3.5
Evaporator Leaving Water Temperature (LWT) sensor fault
This alarm is generated any time that the input resistance is out of an acceptable range.
Symptom
Cause
Solution
Unit status is Off.
All circuits are stopped with a normal
shutdown procedure.
Bell icon is moving on controller’s display.
String in the alarm list:
UnitOffLvgEntWTempSen
String in the alarm log:
UnitOffLvgEntWTempSen
String in the alarm snapshot
UnitOffEvpLvgWTempSen
Sensor is broken.
Check
for
sensor
integrity.
according table and allowed kOhm (k
)
range.
Check correct sensors operation
Sensor is shorted.
Check if sensor is shorted with a
resistance measurement.
Sensor is not properly connected (open).
Check for absence of water or humidity on
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
6.3.6
Evaporator Water Freeze alarm
This alarm is generated to indicate that the water temperature (entering or leaving) has dropped below a safety
limit. Control tries to protect the heat exchanger starting the pump and letting the water circulate.
Symptom
Cause
Solution
Unit status is Off.
All circuits are stopped immediately.
Bell icon is moving on controller’s display.
String in the alarm list:
UnitOffEvapWaterTmpLo
String in the alarm log:
UnitOffEvapWaterTmpLo
String in the alarm snapshot
UnitOffEvapWaterTmpLo
Water flow too low.
Increase the water flow.
Inlet temperature to the evaporator is too
low.
Increase the inlet water temperature.
Flow switch is not working or no water flow.
Check the flow switch and the water pump.
Sensors readings (entering or leaving) are
not properly calibrated.
Check the water temperatures with a
proper instrument and adjust the offsets