Daikin UATYA-B, Operation Manual

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Service manual Daikin R32 Rooftops UATYA-B
ESIE21-02 – 2021.03
A graphical representation is shown below.
HU9
100
0
%
HU9 HU10
HU6
SdR g/kg
HU10
Fig. 11 Absolute humidity control
3.4.4 Absolute humidity control with PID control
If parameter “HU11” is set to “1”, humidity control is performed according to the absolute humidity value.
The controller calculates the absolute humidity value based on the relative humidity and temperature readings.
Absolute humidity is managed according to parameter “HU14”, which identifies the probe on which the controller must gua
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rantee maintenance of the entered setpoint, and on parameter “HU12” that determines the type of humidity control.
If the value in parameter “HU12” is set to “1”, the controller calculates the demand and checks the value measured by the
probe against the setpoint value and according to its variation over time using the parameters set in the PID.
The parameters relating to absolute humidity PID control are shown in the table.
The values of the parameters are representative. In specific cases, different values can be set.
Parameter Value UM Description
PID24 500 - Humidity control for humidification - Kp
PID25 75 - Humidity control for humidification - Ki
PID26 2000 - Humidity control for humidification - Kd
PID30 1.0 g/kg Humidity control for humidification - Dead band
PID39 1 - Humidity control for humidification - Moving average
PID41 0 - Humidity control for humidification - Manual override (0 = Disabled)
PID44 0 - Humidity control for humidification - Min. output
PID45 100 - Humidity control for humidification - Max. output
3 Software functions