Air and Water cooled inverter chillers and heat pump
D-EOMZC00105-17EN
Operation Manual
58/84
EWAD TZ - EWAD TZ B -EWWD VZ
Air and Water cooled inverter chillers and
heat pump
Local HMI
Network
Auto
6.1.13 Heat Recovery Water Temperatures inverted (A/C units only)
This alarm is generated any time that the heat recovery entering water temperature is lower than the leaving
by 1°C and at least one compressor is running.
Symptom
Cause
Solution
Bell icon is moving on controller’s display.
Bell icon is movin
g on controller’s display.
String in the alarm list:
Unit HRInvAl
String in the alarm log:
Unit HRInvAl
String in the alarm snapshot
Unit HRInvAl
Entering and leaving water temperature
sensors are inverted.
Check cabling of the sensors on the unit
controller.
Check offset of the two sensors with the
water pump running
Entering and leaving water pipes are
reversed
Check if the water flows in counter flow
respect to refrigerant.
Water pump operate reverse.
Check if the water flows in counter flow
respect to refrigerant.
Reset
Notes
Local HMI
Network
Auto
6.1.14 Rapid Recovery Module Communication Fail
This alarm is generated in case of communication problems with the RRC module.
Symptom
Cause
Solution
Bell icon is moving on controller’s display.
String in the alarm list:
RpdRcvryCommFail
String in the alarm log:
RpdRcvryCommFail
String in the alarm snapshot
RpdRcvryCommFail
Module has no power supply
Check the power supply from the
connector on the side of the module.
Check if LEDs are both green.
Check if the connector on the side is tightly
inserted in the module
Module address is not properly set
Check if module’s address is correct
referring to the wiring diagram.
Module is broken
Check if LED are on and both green. If
BSP LED is solid red replace the module
Check if power supply is ok but LEDs are
both off. In this case replace the module
Reset
Notes
Local HMI
Network
Auto
6.1.15 Switch Box Temperature sensor fault (A/C units only)
This alarm is generated any time that the input resistance is out of an acceptable range.
Symptom
Cause
Solution
Unit status is On
Bell icon is moving on controller’s display.
Bell icon is moving on controller’s display.
String in the alarm list:
SwitchBoxTempSen
String in the alarm log:
SwitchBoxTempSen
String in the alarm snapshot
SwitchBoxTempSen
Sensor is broken.
Check
for
sensor
integrity.
according table and allowed kOhm (k
)
range.
Check correct sensors operation
Sensor is shorted.
Check if sensor is shorted with a
resistance measurement.
Sensor is not properly connected (open).
Check for absence of water or humidity on
electrical contacts.
Check for correct plug-in of the electrical
connectors.
Check for correct sensors wiring also
according electrical scheme.
Reset
Notes