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5.2.2 Dynamic setpoint from external air probe in cooling mode
The setpoint value entered in parameter "ST1" is "compensated" against the external air temperature.
The parameters concerned are shown in the table.
The values of the parameters are representative. In specific cases, different values can be set.
Parameter
Value
ST1
27.0
SD2
1
SD10
25.0
A graphical representation is shown below.
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 cooling
mode is as follows:
- if the external air temperature is lower than the setpoint in parameter "SD10", the value of the control setpoint is
the value stored in parameter "ST1";
- if the external air temperature is higher than the setpoint in parameter "SD10", plus the value in parameter
"SD11", the value of the control setpoint is given by the sum of the values stored in parameters "ST1" and "SD12";
- if the external air temperature is between the values of parameter "SD10" and the sum of the values stored in
parameters "SD10" and "SD11", the value of the control setpoint varies proportionally between the value stored
in parameter "ST1" and the sum of the values stored in parameters "ST1" and "SD12".
Parameter "SD12" can have positive or negative values. When the value is negative, parameter
"SD12" has to be subtracted from the value of parameter "ST1".
We reserve the right to make changes without any prior notice.
UATYA
4P645203-1
UM
Description
°C
Mechanical cooling - Temperature setpoint
-
States of the unit in which it is active
Mechanical cooling - External air temperature - Activation threshold for
°C
compensation
ST1 + SD12
ST1
ST1 - SD12
SD10
Fig. 1 Change in setpoint as the air temperature changes in cooling mode
SD12 > 0
SD12 < 0
Text °C
SD11
Translation from original instructions
Packaged Rooftop
19
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