User Manual

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Siemens Non-communicating room controllers CA2N3881en_02
Building Technologies RXA20.1, RXA21.1, RXA22.1 2012-08-28
Connection diagrams
1
2
4
5
6
11
12
13
15
16
M
D1
GND
D2
CP–
CP+
B1
Y3
G
Y4
19
21
N
L
N
25
26
27
28
Q13
Q14
Q24
Q34
2
3
1
N
N
L
AC 230 V
1
N
L
Q2
Q1
B3
PPS2
Y1
Y2
D1
D2
T
B1
GL
Y3.1
M
GL
Y1.1
M
N1
3881Z03
N.C.
Q44
23
22
24
L
N
Q4
Y3.2
3X2
B2
T
8
9
10
Y1
G
Y2
D3
7
D3
B2.1
X2.2
14M/S
RXA
N2...N4
0...10 V
B1.1
14
15
M
21
L
19
F1
Q43
N1 RXA20.1, RXA21.1, RXA22.1
N2...N4 Max. 3 slave controllers
B1, B2 LG-Ni 1000 temperature sensor
B1.1, B2.1 Setpoint adjuster
X2.2 0…10 V signal (summer/winter compensation)
B3 QAX… room unit
D1, D2 Volt-free contacts (window contact, occupancy sensor, central time switch etc.)
D3 Changeover signal
Y1, Y2 AC 24 V thermic valve actuators
Y1.1, Y3.1 Valve actuator, AC 24 V, 3-position (RXA21.1 only)
Y3.2 Damper actuator with spring return
Q1 Single-speed fan
Q2 3-speed fan
Q4 Electric heating coil
F1 External fuse
Twisted pair
Connecting the field
devices, room units and
supply voltage