Relative Humidity Control With Proportional Control - Daikin UATYA-B Operation Manual

The value set in parameter "HU11" identifies the reference humidity value, as follows:
- 0 = relative humidity;
- 1 = absolute humidity.
Normally, absolute humidity control helps obtain a higher level of precision in maintaining the desired humi-
dity setpoint, if compared to relative humidity control.
The value set in parameter "HU12" identifies the type of humidity control, as follows:
- 0 = proportional.
- 1 = PID.
The value set in parameter HU14" identifies the control probe type, as follows:
- 0 = relative humidity probe on air return line;
3.4.1

Relative humidity control with proportional control

If parameter "HU11" is set to "0", humidity control is performed according to the relative humidity value.
Relative humidity is managed according to parameter "HU14", which identifies the probe on which the controller must gua-
rantee maintenance of the entered setpoint, and on parameter "HU12" that determines the type of humidity control.
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
HU1 58.0
HU2 35.0
HU3 65.0
HU4 5.0
HU5 0.5
A graphical representation is shown below.
Daikin R32 Rooftops UATYA-B
ESIE21-02 – 2021.03
UM Description
% Relative humidity setpoint
% Min. relative humidity setpoint
% Max. relative humidity setpoint
% Relative humidity control differential
% Relative humidity control neutral area
HU4
Fig. 10 Relative humidity control
%
100
0
HU5 HU5
HU1
3 Software functions
SdR %
HU4
Service manual
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