Check the quality of the fluid that flows into
heat exchanger.
Check the glycol percentage and type
(ethilenic or propilenic)
Water flow into water heat exchanger is too
low.
Check that evaporator water pump is
operating correctly providing the required
water flow.
Evaporating pressure transducer is not
working properly.
Check the sensor for proper operation and
calibrate the readings with a gauge.
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.
Increase inlet water temperature.
Check the low pressure safeties settings.
5.5.6 CxOff RestartFault – Restart Fault
This alarm is generated when the compressor internal protection trips
Bell icon is moving on controller’s display.
String in the alarm list:
CxOff RestartFault
String in the alarm log:
CxOff RestartFault
String in the alarm snapshot
CxOff RestartFault
This alarm is generated after 165 seconds
from circuit start if the evaporating
pressure is lower than the Low Pressure
Unload Limit. If this alarm is triggered
means that the unit is working with too low
outside ambient temperature or refrigerant
charge is not properly set
Refer to the Low Pressure alarm.
5.5.7 CxOff MechHighPress - Mechanical High Pressure Alarm
This alarm is generated when the condenser pressure rises above the mechanical high pressure limit causing this device
to open the power supply to all the auxiliary relays. This causes an immediate shutdown of compressor and all the other
actuators in this circuit.
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