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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
61/84
Local HMI
Network
Auto
6.3 Unit Rapid Stop Alarms
6.3.1
Condenser Water Freeze alarm (W/C units only)
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:
UnitOffCondWaterTmpLo
String in the alarm log:
UnitOffCondWaterTmpLo
String in the alarm snapshot
UnitOffCondWaterTmpLo
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.
Refrigerant temperature become too low (<
-0.6°C).
Check the water flow and filter. No good
heat
exchange
condition
into
the
evaporator.
Sensors readings (entering or leaving) are
not properly calibrated
Check the water temperatures with a
proper instrument and adjust the offsets
Wrong freeze limit setpoint
The freeze limit has not been changed as
a function of glycol percentage.
Reset
Notes
Local HMI
Network
Auto
It’s required to check if the condenser has
any damage due to this alarm.
6.3.2
Condenser Water Flow Loss alarm (W/C units only)
This alarm is generated in case of flow loss to the chiller to protect the machine against Mechanical High
Pressure trips.
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:
UnitOffCondWaterFlow
String in the alarm log:
UnitOffCondWaterFlow
String in the alarm snapshot
UnitOffCondWaterFlow
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
6.3.3
Emergency Stop
This alarm is generated any time the Emergency Stop button is activated.
Before resetting the Emergency Stop button please verify that the harmful condition has been removed.
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:
UnitOffEmergencyStop
String in the alarm log:
UnitOffEmergencyStop
Emergency stop button has been pushed.
Turning counterclockwise the emergency
stop button, the alarm should be cleared.