
100/166
Siemens
RXB (KNX) application library
FNC Description of functions for FC-10, FC-11, FC-12
CM110385en_05
Building Technologies
Control sequences
28 Feb 2009
The power consumption is mapped to the following communication object:
Electric output (Output communication object)
Flags
R W K T U
Type Send
heartbeat
Value
1 0 1 1 0 9.024
DPT_Power
yes
Floating point (kW)
8.5
Fan-coils with LTHW radiator (FNC18)
LTHW radiator applications have a proportional control sequence. The controllers
operate with a PI algorithm optimized for thermal or motorized valve actuators. (For
simplicity, the diagram below shows only the P-control action.)
The radiator sequence can also be used for other heating types, e.g. floor heating.
However, the control parameters are not optimized for this.
The heater battery of the fan-coil operates in a cascade with the radiator.
The control sequences come into operation at the effective heating setpoint.
B1
YHC
Q1
YH
T
D3
B1
T
T
10
3
85S
08
100
0
TR [°C]
Y [%]
SpH
SpC
Change-over
YH
H
C
100
0
TR [°C]
Y [%]
SpH
SpC
Change-over
YHC
H
C
10
38
5D
16
YHC
Y Output
signal
TR Room
temperature
SpH
Effective heating setpoint
H Heating
sequence
YH
Heating valve (radiator)
YHC
Heating/cooling valve (fan coil)
B1
Return air sensor
Q1 Fan
8.5.1
Configuration and parameter setting
The radiator as an additional heating sequence has its own settings for the valve
actuator and runtime. The principles are described in section
KNX
R
CO