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Air and Water cooled inverter chillers and heat pump
D-EOMZC00105-17EN
Operation Manual
76/84
EWAD TZ - EWAD TZ B -EWWD VZ
Air and Water cooled inverter chillers and
heat pump
Circuit status is Off.
The compressor does not load anymore or
even unload, circuit is stopped.
Bell icon is moving on controller’s display.
String in the alarm list:
CxCmp1 OffMtrAmpsHi
String in the alarm log:
CxCmp1 OffMtrAmpsHi
String in the alarm snapshot
CxCmp1 OffMtrAmpsHi
The ambient temperature is too high (A/C
units) or condenser water temperature is
higher than the limit set on the unit
envelope (W/C units).
Check the unit selection to see if the unit
can operate at full load.
Check if all fans are operating properly and
are able to keep the condensing pressure
at the proper level (A/C units).
Clean condenser coils to allow a lower
condensing pressure (A/C units).
Check if condenser pump is operating
correctly, giving enough water flow (W/C
units).
Clean condenser water heat exchanger
(W/C units).
The wrong compressor model has been
selected.
Check the compressor model for this unit.
Reset
Notes
Local HMI
Network
Auto
6.6.15 High Motor Temperature Alarm
This alarm indicates that the motor temperature has exceeded the maximum temperature limit for safe
operations.
Symptom
Cause
Solution
Circuit status is Off.
The compressor does not load anymore or
even unload, circuit is stopped.
Bell icon is moving on controller’s display.
String in the alarm list:
CxCmp1 OffMotorTempHi
String in the alarm log:
CxCmp1 OffMotorTempHi
String in the alarm snapshot
CxCmp1 OffMotorTempHi
Insufficient motor cooling.
Check refrigerant charge.
Check if operational envelope of the unit is
respected.
Motor temperature sensor could not
operate properly.
Check the readings of the motor
temperature sensor and check the Ohmic
value. A correct reading should be around
hundreds of Ohm at ambient temperature.
Check the electrical connection of the
sensor with the electronic board.
Reset
Notes
Local HMI
Network
Auto
6.6.16 High Oil Pressure Differential Alarm
This alarm indicates that the oil filter is clogged and needs to be replaced.
Symptom
Cause
Solution
Circuit status is Off.
The circuit is stopped.
Bell icon is moving on
controller’s display.
String in the alarm list:
CxCmp1 OffOilPrDiffHi
String in the alarm log:
CxCmp1 OffOilPrDiffHi
String in the alarm snapshot
CxCmp1 OffOilPrDiffHi
Oil filter is clogged.
Replace oil filter.
Oil Pressure Transducer is reading
incorrectly.
Check Oil Pressure Transducer readings
with a gauge.
Condensing Pressure Transducer is
reading incorrectly.
Check Condensing Pressure Transducer
readings with a gauge.
Reset
Notes
Local HMI
Network
Auto
6.6.17 High Pressure alarm
This alarm is generated in case the Condensing saturated temperature rise above the Maximum condensing
saturated temperature and the control is not able to compensate to this condition. The maximum condenser
saturated temperature is 68.5°C but it can decrease when the evaporator saturated temperature become
negative.