Daikin UATYA110BFC2Y1 [19/356] Dynamic setpoint from external air probe in heating mode

Translation from original instructions

Packaged Rooftop

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UATYA

4P645203-1

5.2.3 Dynamicsetpointfromexternalairprobeinheatingmode

The setpoint value entered in parameter “STH1” is “compensated” against the external air temperature.

The parameters concerned are shown in the table.

The values of the parameters are representative. In specic cases, di󰀨erent values can be set.

Parameter Value UM Description

STH1 40 °C Mechanical heating / Auxiliary heating in winter mode - Temperature setpoint

SD20 15.0 °C

Mechanical heating - External air temperature - Activation threshold for

compensation

SD21 10.0 °C Mechanical heating - External air temperature - Activation di󰀨erential

SD22 5.0 °C

Mechanical heating - External air temperature - Max increase / decrease of the

setpoint

A graphical representation is shown below.

Text °C

SD22 > 0

STH1

STH1 - SD22

SD21

SD20

SD22 < 0

STH1 + SD22

Fig. 2 Change in setpoint as the air temperature changes in heating mode

Where“Text”isthevalueoftheexternalairtemperature.

When this function is enabled, the setpoint value that the controller uses to manage the air temperature in heating

mode is as follows:

- if the external air temperature is higher than the setpoint in parameter “SD20”, the value of the control setpoint is

the value stored in parameter “STH1”;

- if the external air temperature is lower than the setpoint in parameter “SD20”, minus the value in parameter

“SD21”, the value of the control setpoint is given by the sum of the values stored in parameters “STH1” and

“SD22”;

- if the external air temperature is between the values of parameter “SD20” and the di󰀨erence of the values stored

in parameters “SD20” and “SD21”, the value of the control setpoint varies proportionally between the value stored

in parameter “STH1” and the sum of the values stored in parameters “STH1” and “SD22”.

Parameter “SD22” can have positive or negative values. When the value is negative, parameter

“SD22” has to be subtracted from the value of parameter “STH1”.