Connection diagrams
Connection variants for
valve actuators
Siemens
Building Technologies
YH.2
B1
D1
2)
D2
2)
T
1
2
3
4
5
6
19
19
21 21
AC 230 V
N
L
Heating surface (YH) / fan coil changeover (YHC)
Thermal / thermal
Motorized / motorized
Thermal / motorized
Motorized / thermal
Motorized/bus
Bus/motorized
Thermal/bus
Bus/thermal
Bus/bus
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).
RXB application library (KNX)
FNC18 – Two-pipe fan coil (changeover) and radiator
3)
YHC.2
3)
M
M
YH.1
3)
YHC.1
3)
R1
QAX...
7
8
9
10 11 12 13 14 15 16
25 26 27
28
Q1
FNC – Fancoil-Applikationen aus FC-10, FC-11, FC-12
YH.3
YHC.3
M
M
KNX
T
B2
N1
17 18
RXB21.1
4)
Y1
Y2
Y3
YH
YHC
X
YH
YH
YHC
YH
X
YHC
YH
YH
YHC
YH
YH
--
X
X
YHC
YH
X
--
X
YHC
X
X
X
--
X = Not freely available
CM110672en_03
T
D3
Y4
--
YHC
YHC
--
--
YHC
--
--
--
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30.11.2007