Pre-Heating Coil - Daikin UATYA-B Operation Manual

3.3.4

Pre-heating coil

The controller is designed to manage a pre-heating coil: the temperature is set up based on the temperature sensed by the
mixed air probe.
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
STH1 20.0
STH141 0.0
STH142 2.0
STH143 0
STH144 100
A graphical representation is shown below.
In addition to the parameters listed in the table, the abbreviations in the graph are:
- Sdr = mixed air probe;
- %Av= valve opening percentage.
If the temperature of the mixed air is lower than the setpoint in parameter "STH1", minus the "offset" value stored in para-
meter "STH141", the controller increases the valve opening percentage to the coil, within the differential set in parameter
"STH142".
Temperature control ranges between the min. value stored in parameter "STH143" and the max. value in parameter
"STH144".
Daikin R32 Rooftops UATYA-B
ESIE21-02 – 2021.03
UM Description
°C Mechanical heating / Auxiliary heating in winter mode - Temperature setpoint
°C Preheating - Temperature offset
°C Preheating - Activation differential
% Preheating - Minimum request
% Preheating - Maximum request
Fig. 8 Graphical representation of proportional heating demand
%
100
STH144
STH143
0
STH142 STH141
STH1
3 Software functions
SdR °C
Service manual
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