Daikin UATYA-B, Operation Manual

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Service manual Daikin R32 Rooftops UATYA-B
ESIE21-02 – 2021.03
4.2.3 Humidity alarm
When the humidity control function is featured, the controller checks that the humidity values are within the required ope -
rating range.
The parameters involved are shown in the table.
The values of the parameters are representative. In specific cases, different values can be set.
Parameter Value UM Description
PAL77 80.0 % Return air humidity - High humidity threshold
PAL78 0.5 % Return air humidity - High humidity differential
PAL79 10.0 % Return air humidity - Low humidity threshold
PAL80 0.5 % Return air humidity - Low humidity differential
PAL81 60 - Return air humidity - Max. number of alarms per hour
High return air humidity alarm
Alarm code AL12
Reason for activation
When the relative humidity value measured by the probe on the air return line is greater
than the setpoint in parameter “PAL77”
Reset
When the relative humidity value measured by the probe on the return line is lower than the
difference between “PAL77” and “PAL78”
Reset mode Automatic; switches to manual after the trip occurrences per hour set in “PAL78”
Alarm icon Flashing
AlarmLog Yes
Alarm relay Based on “alarm.conf” file
Devices Behaviour in the event of an alarm
All devices They follow their control
Low return air humidity alarm
Alarm code AL13
Reason for activation
When the relative humidity value measured by the probe on the air return line is lower than
the setpoint in parameter “PAL79”
Reset
When the relative humidity value measured by the probe on the return line is greater than
the sum of “PAL79” and “PAL80”
Reset mode Automatic; switches to manual after the trip occurrences per hour set in “PAL78”
Alarm icon Flashing
AlarmLog Yes
Alarm relay Based on “alarm.conf” file
Devices Behaviour in the event of an alarm
All devices They follow their control
4 Alarms