Operating Instructions

22/54
Siemens RXB application library (KNX) RXB – Fan coil applications from FC-10, FC-11, FC-12, FC-13 CM110672en_05
Building Technologies 4BFNC05 – Four-pipe fan coil with electric reheater 2013-06-07
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
10385D61
OFF
TR [°C]
Y
ON
YR
H
10385D37
1 K
YH
SpH
OFF
TR [°C]
ON
10385D38
SpH
YR
SpC
Y
C
YC
Mod.
OFF
TR [°C]
ON
H
YH
SpH
YR
Y
YC
C
SpC
10385D62
OFF
TR [°C]
ON
H
10385D39
YH
SpH
YR
Y
0%
TR [°C]
100%
H
10385D40
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
10385D41