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ABB i-bus® KNX
Heating, Ventilation and Air Conditioning

Valve Drive Controller, 4-fold, MDRC
For the control of heating and cooling applications in the room, such as radiator, floor heat-
ing or cooling ceiling. The device has 4 channels each for the independent control of a heat-
ing or cooling application. Each channel has an electronic valve output for the control of a
thermoelectric valve drive, as well as 3 inputs to detect and monitor the room status (use for
window contact, dew point sensor, level sensor or temperature sensor). Also it is possible to
connect one analog room control unit (SAR/A) to the inputs of each channel. Each channel
VC/S 4.1.1 has its own integrated room temperature controller for the control of the room temperature,
which can be used directly to control the outputs of the device. The VC/S 4.2.1 features an
easy to use manual operation.
Both devices support the ABB i-bus® Tool for advanced diagnosis and improved commis-
sioning.

Description Mod. Order details Price Weight Pack
width 1 piece 1 piece unit
Type code Order code kg pc.
8 VC/S 4.1.1 2CDG110216R0011 0.27 1
Manual operation 8 VC/S 4.2.1 2CDG110217R0011 0.275 1

Valve Drive Actuator, 230 V, MDRC
Controls thermoelectric valve drives (e.g. TSA/K) in heating or cooling systems. Each three
outputs are protected against short-circuit and overload. With manual operation and status
display.

Description Mod. Order details Price Weight Pack
width 1 piece 1 piece unit
VAA/S 6.230.2.1 Type code Order code kg pc.
6-fold 4 VAA/S 6.230.2.1 2CDG110116R0011 0.17 1
12-fold 8 VAA/S 12.230.2.1 2CDG110117R0011 0.3 1
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Floor heating Controller, 6-fold, SM
For the control of up to twelve thermoelectric 24 V DC or analog 0-10 V valve drives (two per
channel). With integrated power supply for the valve drives. The device has an integrated
relay output to switch the heating circuit pump in dependence of the control value of the
valve outputs. The valve outputs can be controlled by the internal or an external room tem-
VAA/A 6.24.2 perature controller. The device is suitable for the installation in the (floor) heating distribu-
tion system.

Description Mod. Order details Price Weight Pack
width 1 piece 1 piece unit
Type code Order code kg pc.
– VAA/A 6.24.2 2CDG120061R0011 0.5 1