Siemens Desigo RXC20.1, Desigo RXC21.1, Desigo RXC20.5, Desigo RXC21.5, Desigo RXC22.5 User Manual
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Desigo™ RXC
Room controllers
RXC20.1 / RXC20.5
RXC21.1 / RXC21.5
RXC22.1 / RXC22.5
For fan-coil systems, chilled ceilings and radiators
with L
ONMARK® compatible bus communications
The RXC20, RXC21 and RXC22 room controllers are used for temperature control
in individual rooms.
For 2-pipe or 4-pipe fan-coil systems, with or without change-over
For chilled ceilings and radiators
Control of AC 24 V PDM
and damper actuators, or electric heating coils
Volt-free relay contacts for fan control and electric heating coils
PI or PID control (depending on application)
Downloadable application software
L
ONMARK® compatible bus communications
For use in the Desigo building automation and control system
AC 230 V operating voltage
1) PDM = pulse/duration modulated
1)
thermic valve actuators, 3-position AC 24 V valve
CA2N3834en_09
2013-06-16
Building Technologies
Use
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”).
Use as an I/O module
Functions
Types
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 parameters 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 AC 24 V triac outputs Relay outputs
RXC20.1
RXC20.5
RXC21.1
RXC21.5
RXC22.1
RXC22.5
S55373-C111
S55373-C112
S55373-C113
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
For 1-speed fan control
For 3-speed fan control
For 3-speed fan control
Internal relay for electric
heating coil
RXZ20.1
Accessories: Terminal covers
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Ordering
Compatibility
Design
When ordering please specify the quantity, product name, type code and application.
The controllers are delivered with the basic application 00020, 00021 or 00022, respectively.
The RXZ20.1 terminal covers are supplied in packs of 1 pair and must be ordered separately.
Example:
30 RXC20.5 room controllers RXC20.5/00020
30 Pairs of terminal covers RXZ20.1
The QAX… room units and the Siemens field devices can be used with the RXC20,
RXC21 and RXC22 room controllers.
For details, refer to the RX hardware overview, CA2N3804.
The RXC20, RXC21 and RXC22 room controllers consist of a housing base, a housing
cover and the printed circuit board with connection terminals. The controller also has a
tool socket, a service LED and a service pin.
Plug-in Connection terminals
Housing cover
70198
Cable restraints
Plug-in
connection terminals
for L
ONWORKS® bus
Housing base
Service LED
Plug-in Connection terminals
Service pin
Tool socket
Terminal cover
Terminal covers (RXZ20.1) are available as an option, to protect the connection terminals from physical contact and dirt. The service LED remains visible when the terminal
covers are in place, and the service pin can be operated with a pointed implement. The
cable is connected to the room controller by breaking out the perforated cable entry
guide.
70200
Removing the terminal cover
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Label
(example RXC22.5)
Note
Connection terminals
STOP
Note!
Neuron ID
Bar code, Code 39
(ID number)
Protection standard
Temperature range
(0 … 50 °C)
Serial No.
Test date, series
(Z, A, B, C…)
Observe notes
in this document
Factory-loaded
application
Definitive
application
Location
Options for use of the labeling fields “Appl.” and “Loc.”:
Hand-written entry of the location and the loaded application ... or
Printed adhesive label (printed from the RXT10 commissioning and service tool)
All connection terminals are detachable plug-in terminals.
To avoid incorrect wiring, terminals which can be connected to AC 230 V (supply and
relay outputs) are physically separate from the other terminals.
Cable restraints must be used for the wires to termi-
3834J01
nals 19 … 28 (AC 230 V). The conductors must be
secured with cable ties (see diagram).
Warning!
Ensure that the power is off before inserting or removing plug-in terminals
connected to a mains voltage.
Communication
The RXC20, RXC21 and RXC22 room controllers communicate with other devices via
the following interfaces:
L
ONWORKS® bus (terminals CLA and CLB) for communication with:
PXX-Lxx, PXR system controller or NIDES.RX interface (to Desigo)
Other Desigo RXC devices
L
ONMARK® compatible 3
rd
party devices (e.g. presence detector)
PPS2 (terminals CP– and CP+):
Interface to the QAX… room units. (In addition to PPS2, the L
ONWORKS® bus is
also looped to the tool socket on the room unit.)
Tool socket (RJ45) on the room controller or room unit, for:
RXT10 commissioning and service tool (L
ONWORKS® bus)
RXT20.1 service terminal (PPS2)
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L
ONWORKS® bus
and PPS2
The diagram below shows the wiring of the LONWORKS® bus and PPS2 interface when
a QAX… room unit is connected. It also shows the options for connecting the RXT10
commissioning and service tool and the RXT20.1 service terminal.
Service LED
Service pin
Disposal
Engineering notes
The yellow service LED shows the current operational status of the room controller by
means of different flashing patterns (see the RXT10 user manual, CM110669).
The service pin is used to identify the room controller in the commissioning phase.
When the pin is pressed the room controller’s identification number is transmitted to the
RXT10 commissioning and service tool.
The devices are classified as waste electronic equipment in terms of the European
Directive 2002/96/EC (WEEE) and should not be disposed of as unsorted municipal
waste.
The relevant national legal rules are to be adhered to.
Regarding disposal, use the systems setup for collecting electronic waste.
Observe all local and applicable laws.
The Desigo RX installation guide, document CA110334, contains the relevant engineering information for the L
ONWORKS® bus (topology, bus repeaters, bus termination, etc.)
and for the selection and dimensions of connecting cables for the supply voltage and
field devices.
The room controllers have an AC 230 V mains supply voltage. The controlled devices
(valves and damper actuators) are supplied directly from the room controller.
This means that a separate AC 24 V supply is not necessary for the RXC20, RXC21
and RXC22 room controllers and the associated field devices.
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