Control Of Additional Heating Stage; Control Of Additional Heating Stage - Control Value Type; Control Of Additional Heating Stage - Additional Heating Type - Busch-Jaeger SD/U12.55.11-825 Manual

e.g. for operating floor heating. Even if the controller calculates the control value zero, a heating
medium will flow through the floor heating system to prevent the floor from cooling down. Under
"Settings of basic load", it is also possible to define whether this basic load will be permanently
active or whether it will be switched by the "Basic load" object.
Note
This parameter is only available when "Control value type" parameter is set
either on "PI continuous, 0 – 100%", "PI PWM, On/Off" or "Fan coil".
8.18.17

Control of additional heating stage

Notice
Only available when the "Control function" parameter is set either on "Heating
with additional stage," or "Heating and cooling with additional stages".
8.18.18 Control of additional heating stage — Control value type
Options:
The actuation of the control valve is determined by the selection of the controller type.
– 2-Point 1 Bit, Off/On: The 2-point control is the simplest type of control. The controller
switches on when the room temperature drops below a certain level (setpoint temperature
value minus hysteresis) and switches off when a particular value (setpoint temperature
value plus hysteresis) is exceeded. The switch-on and switch-off commands are transmitted
as 1-bit commands.
– 2-Point 1 Byte, 0/100%: This is another two-point control as described above. In this case,
however, the switch-on and switch-off commands are transmitted as 1-byte values (0% /
100%).
– PI continuous, 0-100%: The PI controller adjusts its output value between 0% and 100% to
match the difference between the actual value and the setpoint value and enables a precise
regulation of the room temperature to the setpoint value. It sends the control value to the
bus as a 1-byte value (0% - 100%). To reduce the bus load, the control value is only
transmitted if it has changed by a predefined percentage in relation to the previous sent
value. The control value can also be transmitted cyclically.
– PI PWM, On/Off: This also is a PI controller. Here, the output is a 1-bit command. For this to
occur, the calculated control value is converted into a pulse-interval signal.
– Fan coil: The fan coil controller operates like the PI continuous controller. In addition, it
allows the separate activation of the fan in the fan coil unit (e.g. fan speed levels 1 - 3).
8.18.19 Control of additional heating stage — Additional heating type
Options:
Product manual 2CKA001473B5472
Control elements and application parameter
2-point 1 bit, Off/On
2-point 1 byte, (0/100%)
PI continuous, 0-100%
PI PWM, On/Off
Fan coil
PI continuous, 0 – 100% and PI PWM, On/Off:
Application "Internal RTC"
│180