Daikin UATYA-BBAY1 Mode D'emploi page 22

"cascade" temperature control.
If parameter "ST11" is set to "1", "Cascade" control is enabled.
This function fulfils 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 specific cases, different values can be set.
Parameter Value
ST42 24.0
ST43 0.5
ST44 4.0
ST45 15.0
The graph below illustrates cascade control.
Spd °C
ST42
ST45
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.
Translation from original instructions
Packaged Rooftop
22
UM Description
°C Cascade control - Unit setpoint
°C Mechanical cooling - Cascade control - Mode switching offset
°C Mechanical cooling - Cascade control - Operating differential
°C Mechanical cooling - Cascade control - Min. delivery setpoint
AOC ST42
Fig. 5 Change of air delivery setpoint with "cascade" control in cooling mode
ST43 ST44
Tra °C
We reserve the right to make changes without any prior notice.
4P645203-1
UATYA