Air and Water cooled inverter chillers and heat pump
D-EOMZC00105-17EN
Operation Manual
66/84
EWAD TZ - EWAD TZ B -EWWD VZ
Air and Water cooled inverter chillers and
heat pump
String in the alarm snapshot
Cx EcoTempSen
Sensor is not good connected (open).
Check for correct installation of the sensor
on refrigerant circuit pipe.
Check for absence of water or humidity on
sensor electrical contacts.
Check for correct plug-in of the electrical
connectors.
Check for correct sensors wiring also
according with electrical scheme.
Reset
Notes
Local HMI
Network
Auto
6.4.3
Failed Pumpdown
This alarm is generated to indicate that the circuit hadn’t been able to remove all the refrigerant from the
evaporator. It automatically clear as soon as the compressor stops just to be logged in the alarm history. It
may not be recognized from BMS because the communication latency can give enough time for the reset. It
may not even be seen on the local HMI.
Symptom
Cause
Solution
Circuit status is Off.
No indications on the screen
String in the alarm list:
--
String in the alarm log:
Cx Failed Pumpdown
String in the alarm snapshot
Cx Failed Pumpdown
EEXV is not closing completely, therefore
there’s
“short-circuit”
between
high
pressure side with low pressure side of the
circuit.
Check for proper operation and full closing
position of EEXV. Sight glass should not
show refrigerant flow after the valve is
closed.
Check LED on the top of the valve, C LED
should be solid green. If both LED are
blinking alternately the valve motor is not
properly connected.
Evaporating pressure sensor is not
working properly.
Check for proper operation of evaporating
pressure sensor.
Compressor
on circuit
is
internally
damaged with a mechanical problems for
example on internal check-valve, or on
internal spirals or vanes.
Check compressors on circuits.
Reset
Notes
Local HMI
Network
Auto
6.4.4
Fan Fault (A/C units only)
This alarm indicates that at least one of the fans could has some problems
Symptom
Cause
Solution
Circuit status is On.
The compressor keep operating as
normal.
Bell icon
is moving on controller’s display.
String in the alarm list:
Cx FanAlm
String in the alarm log:
Cx FanAlm
String in the alarm snapshot
Cx FanAlm
At least one of the fan has some problems
In case of on/off fan check the
thermal
magnetic
circuit breaker of each
fan. The fan could absorbs too much
current
In case of fan with VFD check the alarm
output of the and message error provided
by each fan VFD
Reset
Notes
Local HMI
Network
Auto
6.4.5
Gas Leakage Sensor fault (A/C units only)
This alarm is generated to indicate that the sensor is not reading properly.
Symptom
Cause
Solution
Circuit status is On.
Bell icon is moving on controller’s display.
Sensor is broken.
Check
for
sensor
integrity.
Check correct sensors operation according