Daikin UATYA180BFC2Y1 [24/356] Parameter value um description

Daikin UATYA180BFC2Y1 [24/356] Parameter value um description
Translation from original instructions
Packaged Rooftop
24
We reserve the right to make changes without any prior notice.
UATYA
4P645203-1
Temperature monitoring with Cascade control
If parameter “ST11” is set to “1”, “Cascade” control is enabled.
This function fulls the system demand and keeps the air temperature in the delivery line within comfort values.
For this purpose, a virtual setpoint is calculated from the stored setpoint, as corrected with the air temperature in the
return line.
The setpoint is corrected dynamically as the air temperature changes in the delivery line.
The parameters involved in cascade temperature control 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
ST42 24.0 °C Cascade control - Unit setpoint
STH46 0.5 °C Mechanical heating - Cascade control - Mode switching o󰀨set
STH47 4.0 °C Mechanical heating - Cascade control - Operating di󰀨erential
STH49 30.0 °C Mechanical heating - Cascade control - Max. air setpoint in delivery line
The graph below illustrates cascade control.
Spd °C
STH49
STH46
Tra °C
STH47
ST42
ST42
AOC
Fig. 7 Change of air setpoint in delivery line with “cascade” control in heating mode
In addition to the parameters listed in the table, the abbreviations in the graph are:
- Spd = air setpoint in delivery line;
- Tra = air temperature in return line;
- AOC = automatic mode switching.
If the air temperature in the return line is lower than the di󰀨erence between the setpoints in parameters “ST42” -
“STH46”, the value of the air setpoint in the delivery line is increased gradually from the value in parameter “ST42” to
the value in parameter “STH49”, within the di󰀨erential set in parameter “STH47”.

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