3 882 DESIGO™ RXA Non-communicating room controllers RXA29.1 For fan-coil systems The RXA29.1 room controller are used for temperature control in individual rooms. For 2-pipe or 4-pipe fan-coil systems, with or without changeover Control of AC 24 V PWM 1) thermic valve actuators, 3-position AC 24 V valve and damper actuators PI control AC 230 V operating voltage 1) PWM = pulse-width modulated Use The RXA29.1 room controller is optimised for control of fan-coil systems in individual rooms.
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 Type RXA29.1/FC-04 AC 24 V triac outputs For two thermic valve actuators or two 3-position actuators RXZ20.1 Accessories: terminal covers Relay outputs None Ordering When ordering, please specify the quantity, product name and type code. The RXZ20.
Design The RXA29.1 room controller consists of a housing base, a housing cover and the printed circuit board. The printed circuit board incorporates the connection terminals and the DIP switches used for configuration. The controllers also have a potentiometer for setpoint adjustment and testing, and a Service LED with different flashing patterns to indicate operational status and test states.
Connection terminals STOP Caution To avoid incorrect wiring, terminals which can be connected to AC 230 V (supply and relay outputs) are physically separate from the other terminals. The cable restraints on the housing base must be used for the connections to terminals 19 … 28 (AC 230 V). The conductors must be secured with cable ties (see diagram).
Mounting instructions The room controllers can be mounted in any orientation using the following fixing options: 00609 00610 Rail mounting The housing base is designed for snapmounting on DIN rails, type EN50022-35x7.5 (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.
Technical data Power supply Operating data Inputs Outputs Interfaces Cable connections Single cable lengths Housing protection standard Protection class Ambient conditions Standards and directives Operaing voltage Rated voltage Frequency Power consumption with output field devices connected Internal fuse Control algorithm Signal inputs D1 … D3 (for volt-free contacts) Quantity Contact voltage Contact current Contact transfer resistance Contact insulation resistance Not suitable for pulse control Meas
Connection terminals and operator controls RXA29.1 00601 b 6 7 8 9 10 11 12 13 DIP ON Y4 G Y3 Y2 G Y1 1 2 3 4 5 6 7 8 9 10 11 12 D3 5 D2 4 GND B2 M T 3 D1 2 B1 1 S 1...
Connection diagrams Connecting the field devices, room units and supply voltage N1 00603 b B1 1 M 2 B2 3 D1 4 GND 5 T B1 B1.1 T B2 B2.1 D1 D2 6 D2 D3 7 D3 Y1 8 Y1 G 9 Y2 10 Y3 11 G 12 Y4 13 GL M Y1.1 GL M Y3.1 Y2 M/S– 14 14 M/S+ 15 15 N 19 N 19 N L L 21 21 L N1 N2...N4 B1, B2 B1.1, B2.1 D1, D2 D3 Y1, Y2 Y1.1, Y3.1 Y3.2 RXA M Y3.2 N2...N4 AC 230 V RXA29.1 Max.
Connecting a power amplifier Parallel connection of a number of thermic valve actuators to output Y1 using the UA1T power amplifier. The same principle applies to outputs Y2 … Y4. Note that the simultaneous load on outputs Y1 … Y4 must not exceed 9.5 VA (power consumption at input X1 of the UA1T: 0.5 VA) AC 24 V G0 G 70206 N1 Y1 6 G 7 Y1 N2 1 NS COM 8 2 LS Y1 7 3 COM COM 6 4 X1 Y1 5 1 NS COM 8 2 LS Y1 7 3 COM COM 6 4 X1 Y1 5 Y1.1 Y1.1 N2 N1 N2 Y1 Y1.1 Notes Y1.
Dimensions 00611 133,2 1,5 Dimensions in mm 3,3 35,3 Without terminal covers 3,9 1 62 With terminal covers 51,5 40,8 12 62 167 35,3 70210 3,9 1 112,4 107,8 00612 Drilling diagram 39 78 3,8 43,2 86,3 2001 - 2012 Siemens Building Technologies AG Subject to technical alterations 10/10 Siemens Building Technologies Non-communicating room controllers RXA29.
