Daikin EWAT_B User Manual

EWAT_B
Operating Manual
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UnitOff PVM
Is important to check the voltage level on
each phases not only with chiller not
running, but mainly with chiller running
from minimum capacity up to full load
capacity. That's because voltage drop can
occur from a certain unit cooling capacity
level, or because of certain working
condition (i.e. high values of OAT);
In these cases the issue can be related
with the sizing of power cables.
There is a short-circuit on the unit.
Check for correct electrical isolation
condition of each unit’s circuit with a
Megger tester.
Reset
Local HMI
Network
Auto



5.3.4 UnitOff EvapWaterFlow - Evaporator Water Flow Loss alarm
This alarm is generated in case of flow loss to the chiller to protect the machine against freezing.
Symptom
Cause
Solution
Unit status is Off.
All circuits are stopped immediately.
Bell icon is moving on controller’s display.
String in the alarm list:
UnitOff EvapWaterFlow
String in the alarm log:
 UnitOff EvapWaterFlow
String in the alarm snapshot
UnitOff EvapWaterFlow
No water flow sensed for 3 minutes
continuously or water flow too low.
Check the water pump filler and the water
circuit for obstructions.
Check the flow switch calibration and
adapt to minimum water flow.
Check if pump impeller can rotate freely
and has no damages.
Check pumps protection devices (circuit
breakers, fuses, inverters, etc.)
Check if water filter is clogged.
Check flow switch connections.
Reset
Local HMI
Network
Auto



5.3.5 UnitOff EXVDriverComm - EXV Driver Extension Communication Error
This alarm is generated in case of communication problems with the EEXV module.
Symptom
Cause
Solution
Unit status is Off.
All circuits are stopped immediately.
Bell icon is moving on controller’s display.
String in the alarm list:
UnitOff EXVDriverComm
String in the alarm log:
 UnitOff EXVDriverComm
String in the alarm snapshot
UnitOff EXVDriverComm
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
Local HMI
Network
Auto



5.4 Circuit Pumpdown Stop Alarms
All alarms reported in this section produce a circuit stop performed following normal pumpdown procedure.
5.4.1 Discharge Temperature Sensor fault
This alarm is generated to indicate that the sensor is not reading properly.
Symptom
Cause
Solution
Circuit status is Off.
The circuit is switched off with the normal
shutdown procedure.
Bell icon is moving on controller’s display.
Sensor is shorted.
Check for sensor integrity.
Check correct sensors operation
according information about kOhm (k)
range related to temperature values.

Daikin EWAT_B Specifications

General

Brand	Daikin
Model	EWAT_B
Category	Chiller
Language	English