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Siemens
RXB application library (KNX)
FNC – Fancoil-Applikationen aus FC-10, FC-11, FC-12 CM110672en_0
3
Building Technologies
FNC20 – Four-pipe fan coil, controlled by one damper
30.11.2007
Application FNC20 includes the following functions
(refer to the description of functions CM110385 for detailed information):
Function
Brief description
)
Four-pipe fan coil with
damper control.
– PI control.
– Two proportional control sequences, heating and cooling.
– Control of motorized damper actuators (AC 24 V, 3-position).
Fan control.
– 1 ... 3-speed, automatic, or
– Manual with room unit.
Temperature measurement. – Room temperature sensor or
– Return air sensor.
Room operating modes.
– Comfort, Precomfort, Economy and Protection mode..
– Change of operating mode via
/Auto switch on room unit, presence detector,
window contact or central command.
Setpoint shift.
– Locally via room unit or centrally.
General functions.
– Presence detector.
– Window switch.
– Master/slave operation.
– Boost heating, night cooling etc.
– Free inputs/outputs.
Room units.
Available with temperature sensor, setpoint adjuster,
button for
/Auto and fan speed control, and LCD display.
Compatible controllers.
FNC20 is supplied with RXB21.1/FC-10.
2
1
4
3
QAX...
R1
10385A10
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16
17 18
M
D1
GN
D
D2
Y1
G
Y2
CP–
CP+
B1
25 26 27
RXB21.1
Q1
3
Q1
4
Y3
G
Y4
Q2
4
Q3
4
28
19
21
N
L
N
21
L
CE–
CE+
19
KNX
Y1
G
Y2
YM
3)
M
M
B
B1
T
D1
2)
D2
1
2
3
Q1
N
L
AC 230 V
N1
CE–
CE+
N.
C.
2)
2)
Type of operation (N/O or N/C) can be selected.
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).
Functions
Connection diagram