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Connection diagram
List of equipment
Note
Siemens
Building Technologies
D3
2)
T
3)
B1
D1
2)
D2
2)
YH
T
1
2
3
4
5
6
7
19
19
21 21
AC 230 V
N
L
Ref.
Description
N1
Room controller.
R1
Room unit
B1
Return air temperature sensor,
room temperature sensor.
B2
Outside air temperature sensor via KNX bus.
D1
Window contact
D2
Presence detector
D3
Safety thermostat, outside air.
Q1
1- ... 3-speed fan
YH.1
Heating valve, thermal, 2-position (PWM) control
YC.1
Cooling valve, thermal, 2-position (PWM) control
YM
Damper actuator for outside air AC 24 V, 3-position
2) Type of operation and allocation to inputs D1 and D2 can be selected. Identical devices must not be
connected to both inputs.
3) Do not exceed the max. simultaneous load on outputs Y1 ... Y4: 9.5 VA (see data sheet 3873).
4) Do not connect the fans in parallel (or use cut-off relays).
A current list of compatible devices is available in the DESIGO RX hardware overview
(N3804).
RXB application library (KNX)
FNC12 – Four-pipe fan coil with outside air damper
3)
YC
R1
YM
3)
QAX...
M
8
9
10 11 12 13 14 15 16
25 26 27
28
4)
Q1
2)
.
2)
.
4)
.
FNC – Fancoil-Applikationen aus FC-10, FC-11, FC-12
KNX
T
B2
N1
17 18
RXB21.1
3)
.
3)
.
3)
.
CM110672en_03
30.11.2007
39/52
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