User Manual

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Siemens Non-communicating room controllers CA2N3881en_02
Building Technologies RXA20.1, RXA21.1, RXA22.1 2012-08-28
Functions
The controller application and the configuration of connected field devices are defined
manually with DIP switches and a potentiometer.
For a detailed description of functions, refer to the DESIGO RXA applications library,
document CA2A3886.
Types
The RXA20.1, RXA21.1 and RXA22.1 room controllers differ only in the number of
outputs available:
Type AC 24 V triac outputs Relay outputs
RXA20.1/FC-01
For two thermic valve actuators For single-speed fan control
RXA21.1/FC-02
For two thermic valve actuators
or two 3-position actuators
For 3-speed fan control
RXA22.1/FC-03
For two thermic valve actuators For 3-speed fan control;
built-in relay for electric heating coil
RXZ20.1
Accessories: terminal covers
Ordering
When ordering, please specify the quantity, product name and type code. The RXZ20.1
terminal covers are supplied in packs of 10 pairs and must be ordered as a separate
item (see also “Mounting”).
Example:
30 Room controllers, type RXA20.1 RXA20.1/FC-01
30 Pairs of terminal covers RXZ20.1
Compatibility
The QAX… room units and the Siemens field devices are suitable for use with the
RXA20.1, RXA21.1 and RXA22.1 room controllers.
For details, refer to the Desigo Hardware overview, N3804.