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 – Two-pipe fan coil with changeover and outside air damper 2013-06-07
Y1
G
Y2
YHC.2
3)
M
YHC.1
3)
KNX
D3
T
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)
Q23 Q24
2 1 3 4
QAX...
R1
10385A07
Y1
G
Y2
YM
3)
M
B2
T
D4
2)
T
CE–
CE+
CE–
CE+
N.C.
19 21
N L N
21
L
19
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
2)
.
D2
Presence detector
2)
.
D3
Changeover signal via KNX bus.
D4
Safety thermostat, outside air.
Q1
1-...3-speed fan
4)
.
YHC.1
Heating/cooling valve actuator, thermal, 2-position (PDM) control
3)
.
YHC.2
Heating/cooling valve actuator, motorized, 3-position control
3)
.
YM
Damper actuator for outside air AC 24 V, 3-position
3)
.
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).
Connection diagram
List of equipment
Note