3 3873P01 873 RXB RXB21.1 RXB22.1 Room controllers For fan-coil applications FC-10, FC-11, FC12 with Konnex bus communications (S-mode and LTE mode) The RXB21.1 and RXB22.1 room controllers are used for temperature control in individual rooms.
Application The RXB21.1 and RXB22.1 room controllers are optimized for control of fan-coil systems in individual rooms. The following options are available with fan-coil systems: • RXB21.1: Single-speed to 3-speed automatic fan control • RXB22.1: Single-speed to 3-speed automatic fan control with integrated relay for electric re-heater The application of each controller is determined by the application software.
Applications The following applications are available for the RXB2… room controllers: Application group (type) Fan-coil applications FC-10 (with RXB21.
Compatibility The RXB2… room controller is compatible with field devices from Siemens Building Technologies and with KNX / EIB-compatible third-party devices. For details, refer to the DESIGO RX hardware overview, CA2N3804. Design The RXB2... controllers consist of a housing base, a housing cover and the printed circuit board with connection terminals. The controllers also have a tool socket, a service LED and a programming pin.
Terminal cover 3873J02 Terminal covers (RXZ20.1) are available as an option, to protect the connection terminals from physical contact and dirt. The programming LED remains visible when the terminal covers are in place, and the programming pin can be operated with a pointed implement. The cable is connected to the room controller by breaking out the perforated cable entry guide. Removing the terminal cover Identification number (unique serial number) 3873Z04 Label (example for RXB21.
Communication The RXB2… controllers communicate with other devices via the following interfaces: • PPS2 interface (proprietary) for the exchange of data with the room units • KNX / EIB bus (terminals CE+ and CE-) for communication with: − PX/KNX interface (to DESIGO INSIGHT) − Interface OCI700 / OCI702 (to Synco) − Other DESIGO RXB controllers − KNX / EIB compatible field devices (e.g. temperature sensor) The tool socket (RJ45) must be connected only by a qualified electrician.
Disposal The device is considered an electronics device for disposal in terms of European Directive 2012/19/EU and may not be disposed of as domestic garbage. • Dispose of the device through channels provided for this purpose. • Comply with all local and currently applicable laws and regulations.
Mounting instructions 3873J07 3873J06 The room controllers can be mounted in any orientation, and fixed as follows: Rail mounting The housing base is designed for snapmounting on DIN rails, type EN50022-35 x 7.5 (can be released with a screwdriver). Surface mounting There are two drill holes for screw-mounting (see “Dimensions” for drilling template). The housing base is fitted with raised supports. Screws: Max. diameter 3.5 mm, min. length 38 mm STOP Note! Tightening torque for fixing screws max. 1.
• In the event of a long-term short circuit (approx. 4 minutes) or overload, the thermal fuse in the transformer may trip. Subsequently, the device must be exchanged. • There is no protection against accidental connection on the AC 24 V side.
Ports/interfaces Interface to room unit KNX / EIB bus Cable connections Number of room units connectable Interface type for room unit for ETS Professional / ACS PPS2 baud rate Baud rate on KNX / EIB bus Interface type Transceiver Bus current Baud rate Bus topology: Refer to KNX / EIB manual 1 PPS2 KNX / EIB bus 4.8 kbit/s 9.6 kbit/s KNX / EIB (electrically isolated) TP-UART 5 mA 9.
Reference documentation Building Services Management Manual – Fundamental principles, and ... – Applications Zentralverband Elektrotechnik- und Elektronikindustrie e.V. (ZVEH) (Central association for the electrical and electronic engineering industry), Stresemannallee 19D-60596 Frankfurt a. M, Germany. D2 Y1 G Y2 3873A08 GND EIB / KNX T 2 Q34 Q24 Q13 L L Q14 AC 230V 5(4)A AC 230V N 1 4 3 QAX... M M N 17 18 CE – N.C.
D2 Y1 G Y2 3873A09 GND CE – D1 17 18 10 11 12 13 14 15 16 CE + 9 CE – 8 CE + 7 CP + 6 N.C. 5 CP – 4 N.C. 3 N.C. 2 N.C. 1 B1 RXB22.1 M Connection terminals EIB / KNX T 2 1 4 3 QAX... M 19 19 21 21 22 23 24 Q34 Q24 Q14 AC 230V 5(4)A Q13 Q44 Q43 N.C.
Connection diagrams Connection of field devices, room unit, KNX / EIB bus and power supply N1 1 M 2 D1 4 GND 5 D2 6 Y1 7 G 8 Y2 9 T B1 D1 D2 Y1 Y1.1 GL Y2 Y3 Y3 10 G 11 Y4 12 1 M 2 D1 4 GND 5 D2 6 Y1 7 G 8 Y2 9 T M M B1 D1 D2 Y1.2 Y1 Y1.1 Y1.2 M GL M M Y2 Y3.2 Y3.1 GL B1 3873A11_01 N2 B1 Y2.
Parallel connection of several thermic valve actuators Up to two thermic actuators per sequence may be connected directly to the room controller. With more than two thermic actuators, a UA1T power amplifier is required. The principle is the same for output Y2. Do not exceed the maximum simultaneous load on outputs Y1 and Y2 (max. 9.5 VA). Power consumption at input X1 of the UA1T: 0.5 VA. Mixed operation: It is not permissible to connect thermic actuators both to the controller and to the power amplifier.
Dimensions 4,4 Dimensions in mm 3,3 35,3 133,2 3873M14 Without terminal cover 3,9 1 62 51,5 5 62 3,9 1 167 35,3 3873M15 With terminal covers 112,4 107,8 15/16 Siemens Building Technologies RXB21.1, RXB22.
Drilling diagram (1:1) 3873M16 39 78 3,6 43,2 86,3 Published by: Siemens Switzerland Ltd. Building Technologies Division International Headquarters Gubelstrasse 22 6301 Zug Switzerland Tel. +41 41-724 24 24 www.siemens.com/buildingtechnologies © Siemens Switzerland Ltd 2006 Delivery and technical specifications subject to change 16/16 Siemens Building Technologies RXB21.1, RXB22.
