Function; Functional Overview - ABB i-bus KNX Product Manual

®
ABB i-bus KNX

Function

4 Function
4.1

Functional overview

Cooling ceilings, floor heating and radiators are used to cool or heat the room. The required room
temperature is achieved via these devices using a control.
The valve drive controller controls the flow valve and reduces or increases the quantity of hot or cold water
to suit the demand for heat/cold in the room.
The valve is opened and closed during this process by an electrothermal valve drive. This drive is in turn
connected to the valve drive controller.
For each of its four channels, the device has an output for the actuation of a thermoelectric valve drive
(e.g. TSA/K)
In addition, three inputs are available per channel. These inputs can be used for the connection of
temperature sensors as well as for monitoring a window, the formation of condensation or a collection tray.
Additionally, one of the inputs can be used to connect a local analog room control unit (SAR/A).
Such a device can be used for local adjustment of the setpoint temperature for the room. When another
input is used, the room temperature additionally can be measured directly via the analog room control unit.
The scanning voltage for the inputs is provided by the valve drive controller.
In addition to actuation via the integrated valve output, other devices for room temperature control can be
actuated via group objects. For this purpose the control also includes a basic stage and an additional
stage for heating and cooling.
The four channels of the device operate completely independently of each other such that it is possible
to control four different rooms.
The variant VC/S 4.2.1 also has manual operation directly at the device.
Function/device
Integrated temperature controller for room
temperature control
Number of channels
Type of valve actuation
Inputs for sensors per channel
Inputs for temperature measurement per
channel
Input for the connection of an analog room
control unit per channel
Manual operation
Table 9: Functional overview
VC/S 4.1.1
x
4
PWM
Off/On
3
2
1
-
VC/S 4.x.1 | 2CDC508220D0211 Rev. A 27
VC/S 4.2.1
x
4
PWM
Off/On
3
2
1
x