Control Of Additional Cooling Stage; Control Of Additional Cooling Stage - Control Value Type; Control Of Additional Cooling Stage - Cooling Type - ABB SmartTouch B/stainless Product Manual

10.24.47 Control of additional cooling stage

Notice
Only available when the "Control function" parameter is set either on "Cooling
with additional stage," or "Heating and cooling with additional stages".

10.24.48 Control of additional cooling 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 sent 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. In addition, the control value can be sent cyclically.
– PI PWM, On/Off: This also is a PI controller. The output is as a 1-bit command. For this, 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).
10.24.49 Control of additional cooling stage — Cooling type
Options:
Two cooling types (area or fan coil) with preset parameters are available to the user.
If the required cooling type is not available, individual parameters can be specified in free
Product manual 2CKA001473B5343
KNX control elements and application parameters
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:
Area (e.g. cooling ceiling) 5°C 240 min
■
Free configuration
■
Fan coil:
Fan coil 4°C 90 min
■
Free configuration
■
Application "Internal RTC"
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