Daikin EWAT_B User Manual

EWAT_B
Operating Manual
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String in the alarm log:
 EvapPump1Fault
String in the alarm snapshot
EvapPump1Fault
Check for problem in wiring connection
between pump starter and unit controller.
Check the water pump filter and the water
circuit for obstructions.
Flow Switch doesn’t operate properly
Check flow switch connection and
calibration.
Reset
Local HMI
Network
Auto



5.1.4 EvapPump2Fault - Evaporator Pump #2 Failure
This alarm is generated if the pump is started but the flow switch is not able to close within the recirculate time. This can
be a temporary condition or may be due to a broken flowswitch, the activation of circuit breakers, fuses or to a pump
breakdown.
Symptom
Cause
Solution
Unit could be ON.
Bell icon is moving on controller’s display.
Backup pump is used or stop of all circuits
in case of pump #1 failure.
String in the alarm list:
EvapPump2Fault
String in the alarm log:
 EvapPump2Fault
String in the alarm snapshot
EvapPump2Fault
Pump #2 may not be operating.
Check for problem in electrical wiring of
the pump #2.
Check that electrical breaker of pump #2
is tripped.
If fuses are used to protect the pump,
check the integrity of fuses.
Check for problem in wiring connection
between pump starter and unit controller.
Check the water pump filter and the
water circuit for obstructions.
Flow Switch doesn’t operate properly
Check flow switch connection and
calibration.
Reset
Local HMI
Network
Auto - Reset



5.1.5 ExternalEvent - External Event
This alarm indicates that a device, whose operation is linked with this machine, is reporting a problem on the dedicated
input.
Symptom
Cause
Solution
Unit status is Run.
Bell icon is moving on controller’s display.
String in the alarm list:
External Event
String in the alarm log:
ExternalEvent
String in the alarm snapshot
ExternalEvent
There is an external event that has caused
the opening, for at least 5 seconds, of the
digital input on the controller board.
Check for reasons of external event and
if it can be a potential problem for a
correct chiller operation.
Reset
Local HMI
Network
Auto



5.1.6 HeatRec EntWTempSen - Heat Recovery Entering Water 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
Heat Recovery is Off
Bell icon is moving on controller’s display.
String in the alarm list:
HeatRec EntWTempSen
String in the alarm log:
 HeatRec EntWTempSen
String in the alarm snapshot
HeatRec EntWTempSen
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

Daikin EWAT_B Specifications

General

Brand	Daikin
Model	EWAT_B
Category	Chiller
Language	English