User Manual

13/16

Siemens RXC20, RXC21, RXC22 – Room controllers CA2N3834en_12

Building Technologies 2015-12-23

Connection diagrams

LonWorks® Bus

N1 RXC20, RXC21, RXC22

B1 Temperature sensor LG-Ni 1000

D1, D2 Volt-free contacts (window contact, occupancy sensor, etc.)

Y1...Y4 AC 24 V thermic valve actuators

Y1.1 AC 24 V, 3-position valve or damper actuator

Y1.2, Y2.2, AC 24 V contactors for electric heating coil

Y3.1 AC 24 V, 3-position valve or damper actuator

Y3.2, Y4.2 AC 24 V contactors for electric heating coil

B2 QAX… room unit

Q1 3-speed fan

Q1.1 1-speed fan

Q2 Electric heating coil

Twisted pair

• Parallel operation of fans at relay outputs Q14 … Q34 is not permitted. For

parallel operation use cut-off relays or slave room controllers.

• At Q2 (1.8 kW max. ohmic load), use additional external fuses of max. 10 A to

protect the conductor tracks.

For information on the compatibility of the various field devices with the RXC20, RXC21

and RXC22 room controller, refer to the various application descriptions.

See Applications library, document V1: CA2A3810, V2: CA110300).

Connection of

field devices, room unit,

ONWORKS® bus and

power supply

STOP

Note!

Note