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Siemens
RXB application library (KNX)
FNC – Fancoil-Applikationen aus FC-10, FC-11, FC-12 CM110672en_0
3
Building Technologies
FNC10 – Two-pipe fan coil with changeover and outside air damper
30.11.2007
Two-pipe fan coil with changeover and outside
air damper
FNC10
KNX
R
•
Heating only (with LTHW), cooling only (with CHW) or changeover.
•
Changeover signal via KNX bus.
•
Modulating control of heating/cooling valve.
•
Outside air damper for outside air supply.
•
Outside air temperature sensor via KNX bus.
•
Automatic or manual fan control.
Plant diagram
N1 Room
controller.
R1
Room unit with temp.
sensor.
B1
Return air sensor.
B2
Outside air temperature
sensor via KNX bus.
D1 Window
switch.
D2 Presence
detector.
D3
Changeover signal via KNX
bus.
D4
Safety thermostat, outside
air.
Q1
Fan (1… 3-speed).
YHC Heating/cooling valve.
YM Outside air damper.
1038
5S19
M
T
YM
B1
Q1
B2
N1
R1
D1
D2
T
YHC
D3
D4
KNX
R
Operating diagrams
100
0
TR [°C]
Y [%]
SpH
SpC
Change-over
YHC
YHC
H
C
10
38
5D
4
5
TO [°C]
Y [%]
SpC
100
0
SpEcm
SpFr
min
10
38
5D
4
4
YM
Y Output
signal.
TR Room
temperature.
TO
Outside air temperature.
SpH
Effective heating setpoint.
SpC Effective
cooling
setpoint.
SpEcm Economizer setpoint.
SpFr
Risk of frost limit
H Heating
sequence.
C Cooling
sequence.
YHC Heating/cooling
valve.
YM
Outside air damper.
Q14
Fan speed 1.
Q24
Fan speed 2.
Q34
Fan speed 3.
10
38
5D
4
6
Change-over
TR [°C]
Y
H
C
Q14
Q24
Q34
SpH
SpC