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
63/84
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 evaporator has
any damage due to this alarm.
6.3.7
External alarm
This alarm is generated to indicate that an external device whose operation is linked with this unit operation.
This external device could be a pump or an inverter.
Symptom
Cause
Solution
Unit status is Off.
All circuits are switched off with the normal
shutdown procedure.
Bell icon is moving on controller’s display.
String in the alarm list:
UnitOffExternalAlarm
String in the alarm log:
UnitOffExternalAlarm
String in the alarm snapshot
UnitOffExternalAlarm
There is an external event that has caused
the opening, for at least 5 seconds, of the
port on the controller board.
Check causes of the external event or
alarm.
Check electrical wiring from unit controller
to the external equipment in case of any
external events or alarms have been
occurred.
Reset
Notes
Local HMI
Network
Auto
NOTE: What above applies in case of configuration of the external fault digital input as Alarm.
6.3.8
Gas Leakage Alarm (W/C units only)
This alarm is generated when the external leak detector(s) detects a refrigerant concentration higher that a
threshold. To clear this alarm is required to clear the alarm either locally and, if needed, on the leak detector
itself.
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:
UnitOffGasLeakage
String in the alarm log:
UnitOffGasLeakage
String in the alarm snapshot
UnitOffGasLeakage
Refrigerant leakage
Locate the leakage with a sniffer and fix
the leakage
Leak detector is not properly powered
Check the power supply of the leak
detector.
Leak detector is not properly connected to
the controller.
Check the connection of the detector with
reference to the wiring diagram of the unit.
Leak detector is broken
Replace the leak detector.
Leak detector is not required/needed
Check the configuration on the unit
controller and disable this option.
Reset
Notes
Local HMI
Network
Auto
6.3.9
Heat Recovery Water Freeze Protect alarm (A/C units only)
This alarm is generated to indicate that the heat recovery 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:
UnitOff HRFreeze
String in the alarm log:
UnitOff HRFreeze
String in the alarm snapshot
UnitOff HRFreeze
Water flow too low.
Increase the water flow.
Inlet temperature to the heat recovery is
too low.
Increase the inlet water temperature.
Sensors readings (entering or leaving) are
not properly calibrated
Check the water temperatures with a
proper instrument and adjust the offsets