Coordinated Room Controllers - Siemens Desigo RXB Technical Manual

Coordinated room controllers

RXB21.1 and RXB22.1 compact room controllers for fan-coil units
The input/output configuration and mounting options of these room controller s makes
them ideal for fan coil applications. They can be installed in fan coil units, in control
panels or on ducting.
RXB24.1 compact room controller for chilled ceilings and radiators
This controller contains chilled ceiling and radiator applications, and is designed for
installation in ceiling voids or for underfloor or sill mounting.
Inputs and outputs
The functions of the inputs and outputs are determined by the particular application and
its parameters. So, for example, the AC 24 V outputs can be configured either for
thermic valve actuators or for 3-position actuators (depending on the application).
Connections / Functions
Power supply
KNX bus
PPS2 interface for standard room unit (PPS2)
1)
Digital inputs
Analog input for LG-Ni 1000 temperature sensor
2)
AC 24 V outputs
3)
Volt-free relay outputs
Relay for electric heating coil
1) For window switches, presence detectors and dew point sensors
2) For control of valve actuators (2-position, 3-position or both, depending on application)
3) For fan control
RXB 21.1 22.1
AC 230 AC 230
2 2
1 1
4 2
3 3
1
24.1
AC 230
2
1
4
7