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Siemens
RXB application library (KNX)
FNC – Fancoil-Applikationen aus FC-10, FC-11, FC-12 CM110672en_0
3
Building Technologies
FNC02 – Two-pipe fan coil with changeover
30.11.2007
FNC02
Two-pipe fan coil with changeover
KNX
R
•
Heating only (with LTHW), cooling only (with CHW) or changeover.
•
Changeover via KNX bus.
•
Modulating control of heating/cooling valve.
•
Automatic or manual fan control.
Plant diagram
N1 Room
controller.
R1
Room unit with temp.
sensor.
B1
Return air sensor.
D1 Window
switch.
D2 Presence
detector.
D3
Changeover signal via KNX
bus.
Q1
Fan (1 ... 3 speeds).
YHC Heating/cooling valve.
T
B1
Q1
N1
R1
D1
D2
T
YHC
D3
KNX
R
10
3
8
5S
10
Operating diagrams
100
0
TR [°C]
Y [%]
SpH
SpC
Change-over
YHC
YHC
H
C
10385D45
Y Output
signal.
TR Room
temperature.
SpH
Effective heating setpoint.
SpC Effective
cooling
setpoint.
H Heating
sequence.
C Cooling
sequence.
YHC Heating/cooling
valve.
Q14
Fan speed 1.
Q24
Fan speed 2.
Q34
Fan speed 3.
10385D34
Change-over
TR [°C]
Y
H
C
Q14
Q24
Q34
SpH
SpC