Siemens Desigo RXC20.1 Manual page 2

Use
Use as an I/O module
Functions
Types
2/16
Siemens
Building Technologies
The RXC20, RXC21 and RXC22 room controllers are optimized for control of fan-coil
systems, chilled ceilings and radiators in individual rooms.
The following versions are available for fan-coil systems:
 RXC20:
1-speed automatic fan control
 RXC21:
1- to 3-speed automatic fan control
 RXC22:
1- to 3-speed automatic fan control
with integrated relay for electric re-heating
The controller application is determined by downloadable application software, also
referred to simply as the "application". The various applications and the associated
functions are described in detail in the RXC applications library. (V1: CA2A3810,
V2: CA110300).
The room controllers are delivered with the basic application 00020 (RXC20),00021
(RXC21) and 00022 (RXC22), respectively. The basic application, which contains only
I/O module functions, is overwritten with the definitive application in the commissioning
phase. The RXT10 commissioning and service tool is used for this purpose (see
"Commissioning").
In conjunction with a building automation system, the RXC20, RXC21 and RXC22 room
controllers can also be used as universal I/O modules, e.g. to register binary signals or
to control various equipment (ON/OFF or pulse control with AC 24 V or volt-free relay
contacts).
In this case, the room controllers are loaded with basic application 00020, 00021 and
00022, respectively. The inputs can then be read and the outputs overridden via the
building automation system.
The room controller functions are determined by the selected application and its pa-
rameters and by the input/output configuration.
For a detailed description of functions, refer to the Desigo RXC applications library (V1:
CA2A3810, V2:CA110300).
When Desigo RXC is integrated into a building automation system additional functions
become available such as time scheduling, central control of setpoints, etc. (refer to the
Desigo INSIGHT documentation for further information).
The RXC20, RXC21 and RXC22 room controllers differ only in the number of outputs
they provide:
Type SSN
RXC20.1
RXC20.5 S55373-C111
RXC21.1
RXC21.5 S55373-C112
RXC22.1
RXC22.5
S55373-C113
RXZ20.1 Accessories: Terminal covers
RXC20, RXC21, RXC22 – Room controllers
AC 24 V triac outputs
For two thermic valve actuators
or one 3-position actuator
For four thermic valve actuators
or two 3-position actuators
For two thermic valve actuators
or one 3-position actuator
Relay outputs
For 1-speed fan control
For 3-speed fan control
For 3-speed fan control
Internal relay for electric
heating coil
CA2N3834en_09
2013-06-16