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Siemens
RXB21.1, RXB22.1 Room controllers
CM2N3873en_06
Building Technologies
02 Apr 2010
Connection diagrams
1
2
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
M
D1
GND
D2
Y1
G
Y2
CP –
CP +
B1
Y3
G
Y4
19
19
21
N
L
N
25
26
27
28
Q13
Q14
Q24
Q34
2
3
1
N
L
N
L
AC 230 V
KNX / EIB
1
N
L
Q1
Q1.1
B2
PPS2
KNX / EIB
Y3
Y4
Y1
Y2
D1
D2
T
B1
GL
Y3.1
M
GL
Y1.1
M
N1
3873A
11
Q43
Q44
23
22
24
L
N
Q2
21
L
CE –
CE +
CE –
CE +
N.C.
1
2
4
3
N1 RXB21.1,
RXB22.1
B1
LG-Ni 1000 temperature sensor
D1, D2
Volt-free contacts (window contact, occupancy sensor, etc.)
Y1...Y4
AC 24 V thermic valve actuators
Y1.1
Motorized AC 24 V, 3-position valve or damper actuator
Y3.1
Motorized AC 24 V, 3-position valve or damper actuator
B2
QAX… room unit
Q1 3-speed
fan
Q1.1 1-speed
fan
Q2
Electric heating coil
Twisted pair
Fans connected to relay outputs Q14 … Q34 must not be operated in
parallel. For parallel operation use cut-off relays or slave room controllers.
At Q2 (1.8 kW max. resistive load), use additional external fuses of max. 10 A
to protect the pcb tracks.
For information on the compatibility of field devices with the RXB21.1 and RXB22.1
room controller, refer to the various application descriptions (see the FNC description of
functions, document CA110385)
Connection of
field devices, room
unit, KNX / EIB bus
and power supply
Note
