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Siemens
RXB application library (KNX)
FNC – Fancoil-Applikationen aus FC-10, FC-11, FC-12 CM110672en_0
3
Building Technologies
FNC05 – Four-pipe fan coil with electric reheater
30.11.2007
Operating diagrams
Application mode "Auto" (0).
Application mode " Heating" (1).
In "Heating" mode, the electric heating
coil operates as a reheater for LTHW
heating, i.e. only when the valve is fully
open.
Application mode "Cooling" (3).
In “Cooling” mode, the electric heating
coil is the only heating source once the
temperature falls below SpH.
1-stage
OFF
TR [°C]
Y
ON
YR
H
1 K
YH
SpH
YC
C
SpC
10
38
5D
6
1
OFF
TR [°C]
Y
ON
YR
H
10
38
5D37
1 K
YH
SpH
OFF
TR [°C]
ON
103
8
5
D38
SpH
YR
SpC
Y
C
YC
Mod.
OFF
TR [°C]
ON
H
YH
SpH
YR
Y
YC
C
SpC
10
38
5
D
6
2
OFF
TR [°C]
ON
H
1038
5D39
YH
SpH
YR
Y
0%
TR [°C]
100%
H
10
38
5D
4
0
SpH
YR
Y
SpC
YC
C
Y Output
signal.
TR Room
temperature.
SpH
Effective heating setpoint.
SpC Effective
cooling
setpoint.
H Heating
sequence.
C Cooling
sequence.
YH Heating/cooling
valve.
YR
Contactor or solid state relay for electric
heating coil.
Y Output
signal.
TR Room
temperature.
SpH
Effective heating setpoint.
SpC Effective
cooling
setpoint.
H Heating
sequence.
C Cooling
sequence.
Q14
Fan speed 1.
Q24
Fan speed 2.
Q34
Fan speed 3.
TR [°C]
Y
H
C
Q14
Q24
Q34
SpH
SpC
10
38
5D
4
1