Siemens Desigo RXB Technical Manual page 53

Connection diagrams
Connection of
field devices, room
unit, KNX / EIB bus
and power supply
Note
Siemens
Building Technologies
N1
B1
1
T
M
2
4
D1
GND 5
D2 6
Y1
7
G 8
Y2
9
Y3 10
11
G
Y4 12
2
CP – 13
PPS2
1
14
CP +
4
CE + 15
KNX / EIB
CE –
16 3
CE + 17
KNX / EIB
CE –
18
N 19
N
N 19
AC 230 V
L 21 L
L
21
N.C.
22
Q43 23
Q44 24
Q13 25
26 1
Q14
2
27
Q24
3
Q34 28
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)
RXB21.1, RXB22.1 Room controllers
B1
D1
D2
Y1
Y1.1
GL M
Y2
Y3
M Y3.1
GL
Y4
B2
L
Q2
N
L
1
N
Q1
L
N
Q1.1
CM2N3873en_06
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02 Apr 2010