Daikin EWAT_B User Manual

EWAT_B
Operating Manual
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String in the alarm log:
 Option2BoardComm
String in the alarm snapshot
Option2BoardComm
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
Local HMI
Network
Auto



5.2 Unit Pumpdown Alarms
All alarms reported in this section produce a unit stop performed following normal pumpdown procedure.
5.2.1 UnitOff EvpEntWTempSen - Evaporator Entering Water Temperature (EWT) sensor fault
This alarm is generated any time the input resistance is out of an acceptable range.
Symptom
Cause
Solution
Unit status is Off.
All circuits are stopped with a normal
shutdown procedure.
Bell icon is moving on controller’s display.
String in the alarm list:
UnitOff EvpEntWTempSen
String in the alarm log:
 UnitOff EvpEntWTempSen
String in the alarm snapshot
UnitOff EvpEntWTempSen
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
Local HMI
Network
Auto



5.2.2 UnitOffLvgEntWTempSen - Evaporator Leaving Water Temperature (LWT) sensor fault
This alarm is generated any time that the input resistance is out of an acceptable range.
Symptom
Cause
Solution
Unit status is Off.
All circuits are stopped with a normal
shutdown procedure.
Bell icon is moving on controller’s display.
String in the alarm list:
UnitOffLvgEntWTempSen
String in the alarm log:
 UnitOffLvgEntWTempSen
String in the alarm snapshot
UnitOffEvpLvgWTempSen
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
Local HMI
Network
Auto



5.2.3 UnitOffAmbTempSen - Outside Air Temperature sensor fault (A/C units only)
This alarm is generated any time the input resistance is out of an acceptable range.
Symptom
Cause
Solution
Unit status is Off.
All circuits are stopped with a normal
shutdown precedure.
Bell icon is moving on controller’s display.
String in the alarm list:
UnitOffAmbTempSen
String in the alarm log:
 UnitOffAmbTempSen
String in the alarm snapshot
Sensor is broken.
Check for sensor integrity.
Check correct sensors operation
according table and allowed kOhm (k)
range.
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.

Daikin EWAT_B Specifications

General

Brand	Daikin
Model	EWAT_B
Category	Chiller
Language	English