Siemens Desigo RXB Technical Manual page 452

Functions
Function
Four-pipe fan coil with
damper control.
Fan control.
Temperature measurement. – Room temperature sensor or
Room operating modes.
Setpoint shift.
General functions.
Room units.
Compatible controllers.
Connection diagram
50/52
Siemens
Building Technologies
Application FNC20 includes the following functions
(refer to the description of functions CM110385 for detailed information):
Brief description)
– PI control.
– Two proportional control sequences, heating and cooling.
– Control of motorized damper actuators (AC 24 V, 3-position).
– 1 ... 3-speed, automatic, or
– Manual with room unit.
– Return air sensor.
– Comfort, Precomfort, Economy and Protection mode..
– Change of operating mode via
window contact or central command.
– Locally via room unit or centrally.
– Presence detector.
– Window switch.
– Master/slave operation.
– Boost heating, night cooling etc.
– Free inputs/outputs.
Available with temperature sensor, setpoint adjuster,
button for /Auto and fan speed control, and LCD display.
FNC20 is supplied with RXB21.1/FC-10.
2) 2)
B1 D1 D2 YM
T
1 2 3 4 5 6 7
19 19 21 21
AC 230 V
N
L
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).
RXB application library (KNX)
FNC20 – Four-pipe fan coil, controlled by one damper
/Auto switch on room unit, presence detector,
3)
R1
QAX...
M
8 9 10 11 12 13 14 15 16
25 26 27 28
Q1
FNC – Fancoil-Applikationen aus FC-10, FC-11, FC-12
KNX
N1
17 18
RXB21.1
CM110672en_03
30.11.2007