Operating Instructions

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Siemens RXB application library (KNX) RXB – Fan coil applications from FC-10, FC-11, FC-12, FC-13 CM110672en_05
Building Technologies 8BFNC18 – Two-pipe fan coil (changeover) and radiator 2013-06-07
KNX
4)
1 2 3
Q1
N
L
AC 230 V
1 2 3 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
25 26 27
RXB21.1
Q13 Q14
Y3 G Y4
Q24 Q34
28
N1
M
B
B1
T
D1
2)
D2
2)
2 1 3 4
QAX...
R1
10385A09
YH.1
3)
Y1
G
Y2
YH.2
3)
M
T
D3
CE–
CE+
CE–
CE+ N.C.
YHC.1
3)
Y1
G
Y2
YHC.2
3)
M
19 21
N L N
21
L
19
M
M
YH.3 YHC.3
T
B2
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).
Heating surface (YH) / fan coil changeover (YHC)
Y1
Y2
Y3
Y4
Thermal / thermal
YH
YHC
X
--
Motorized / motorized
YH
YH
YHC
YHC
Thermal / motorized
YH
X
YHC
YHC
Motorized / thermal
YH
YH
YHC
--
Motorized/bus
YH
YH
--
--
Bus/motorized
X
X
YHC
YHC
Thermal/bus
YH
X
--
--
Bus/thermal
X
YHC
X
--
Bus/bus
X
X
--
--
X = Not freely available
Connection diagrams
Connection variants for
valve actuators