Daikin EWWH455DZXSA2 [36/47] Circuit alerts

Daikin EWWH480DZXEA1 [36/47] Circuit alerts
D-EOMWC01405-18EN
36/47
EWWD_DZ EWWH_DZ
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:
Power Fault
String in the alarm log:
Power Fault
String in the alarm snapshot
Power Fault
Loss of one phase.
Check voltage level on each of the phases.
Not correct sequence connection of
L1,L2,L3.
Check sequence of L1, L2, L3 connections
according indication on chiller’s electrical
scheme.
Voltage level on the unit’s panel is not in the
allowed range (±10%).
Check that voltage level on each phases is
into the allowed range that is indicated on
the chiller label.
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
Notes
Local HMI
Network
Auto
6.3.10 PVM alarm (A/C units only)
This alarm is generated in case of problems with the power supply to the chiller.
Resolution of this fault requires a direct intervention on the power supply of this unit.
Direct intervention on the power supply can cause electrocution, burns or even death. This action must be
performed only by trained persons. In case of doubts contact your maintenance company.
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:
UnitOffPhaveVoltage
String in the alarm log:
UnitOffPhaveVoltage
String in the alarm snapshot
UnitOffPhaveVoltage
Loss of one phase.
Check voltage level on each of the phases.
Not correct sequence connection of
L1,L2,L3.
Check sequence of L1, L2, L3 connections
according indication on chiller’s electrical
scheme.
Voltage level on the unit’s panel is not in
the allowed range (±10%).
Check that voltage level on each phases is
into the allowed range that is indicated on
the chiller label.
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
Notes
Local HMI
Network
Auto
6.4 Circuit Alerts
6.4.1 Economizer Pressure 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.
Economizer is Off.
Sensor is broken.
Check for sensor integrity.
Check correct sensors operation according

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