![background image](http://html1.mh-extra.com/html/daikin/ewad-tz-b/ewad-tz-b_operation-manual_4001229060.webp)
Air and Water cooled inverter chillers and heat pump
D-EOMZC00105-17EN
Operation Manual
60/84
EWAD TZ - EWAD TZ B -EWWD VZ
Air and Water cooled inverter chillers and
heat pump
Reset
Notes
Local HMI
Network
6.2.4
Evaporator Water Temperatures inverted
This alarm is generated any time the entering water temperature is lower than the leaving by 1°C and at least
one compressor is running since 90 seconds.
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:
UnitOffEvpWTempInvrtd
String in the alarm log:
UnitOffEvpWTempInvrtd
String in the alarm snapshot
UnitOffEvpWTempInvrtd
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
6.2.5
Outside Air Temperature (OAT) Lockout (A/C units only)
This alarm prevents the unit to start if the outside air temperature is too low. Purpose is to prevent low pressure
trips at startup. The limit depends on the fan regulation that is installed on the unit. By default this value is set
to 10°C.
Symptom
Cause
Solution
Unit Status is OAT Lockout.
All circuits are stopped with a normal
shutdown procedure.
Bell icon is moving on controller’s display.
String in the alarm list:
StartInhbtAmbTempLo
String in the alarm log:
StartInhbtAmbTempLo
String in the alarm snapshot
StartInhbtAmbTempLo
Outside ambient temperature is lower than
value set into unit’s controller.
Check the minimum outside ambient
temperature value set into the unit’s
controller.
Check if this value is in accordance with
chiller application, therefore check about
the proper application and utilization of the
chiller.
Improper operation of Outside Ambient
Temperature sensor.
Check for proper operation of OAT sensor
according information about kOhm (k
)
range related to temperature values.
Reset
Notes
Local HMI
Network
Auto
It clears automatically with a 2.5°C of
hysteresis.
6.2.6
Outside Air Temperature sensor fault alarm (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
UnitOffAmbTempSen
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.
Check for correct plug-in of the electrical
connectors.
Check for correct sensors wiring also
according electrical scheme.
Reset
Notes