Daikin UATYA-B, Operation Manual

Page: 112 / 126

112
Service manual Daikin R32 Rooftops UATYA-B
ESIE21-02 – 2021.03
4.6 Probe error alarms
The temperature, pressure and humidity values affecting unit management are measured through the analogue inputs of
the controller.
The software application manages the signals detected by the analogue inputs and checks that they fall within the set ope -
rating range. If the detected signal is outside the operating range, the controller indicates the error and acts accordingly.
The alarms generated by the controller as a result of incorrect reading of the analogue inputs are shown below.
4.6.1 Temperature probes
Return and delivery air temperature
Alarm code AL65 (return air), AL70 (delivery air)
Reason for activation When the value measured by the analogue input is outside the set operating range
Reset When the value measured by the analogue input falls within the set operating range
Reset mode Automatic
Alarm icon Flashing
AlarmLog Yes
Alarm relay Based on “alarm.conf” file
Devices Behaviour in the event of an alarm
If probe is involved in tem -
perature control
If the unit has been running for the past thirty minutes, the controller uses the temperature
value calculated as the average of the measured values for the control, otherwise the unit
stops.
If probe is not involved in
temperature control
If the unit has been running for the past thirty minutes, the controller uses the temperature
value calculated as the average of the measured values for the control, otherwise it stops
the functions referencing the values read by the probe.
The other devices
They follow their own setup parameters if the unit stays operational and they do not depend
on the probe reading.
Mixing air temperature
Alarm code AL91
Reason for activation When the value measured by the analogue input is outside the set operating range
Reset When the value measured by the analogue input falls within the set operating range
Reset mode Automatic
Alarm icon Flashing
AlarmLog Yes
Alarm relay Based on “alarm.conf” file
Devices Behaviour in the event of an alarm
Functions involved Management of air pre-heating and adaptive damper control are inhibited.
The other devices They follow their control
External air temperature
Alarm code AL80
Reason for activation When the value measured by the analogue input is outside the set operating range
Reset When the value measured by the analogue input falls within the set operating range
Reset mode Automatic
Alarm icon Flashing
AlarmLog Yes
Alarm relay Based on “alarm.conf” file
Devices Behaviour in the event of an alarm
Air-induced free cooling
If the unit has been running for the past thirty minutes, the controller uses the temperatu -
re value calculated as the average of the measured values for the control, otherwise free
cooling stops.
Water-induced free cooling
If the unit has been running for the past thirty minutes, the controller uses the temperature
value calculated as the average of the measured values for the control, otherwise the venti -
lation unit in the dry cooler stops.
The other devices They follow their own setup parameters if the fan stays operational, otherwise they stop.
4 Alarms