Fan-Coils With Lthw Radiator (Fnc18); Configuration And Parameter Setting - Siemens Desigo RXB Technical Manual

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Siemens
Building Technologies
The power consumption is mapped to the following communication object:
Electric output (Output communication object)
Flags Type
R W K T U
1 0 1 1 0 9.024
DPT_Power
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
T
D3
YHC
T
YH
Y [%] Y [%]
Change-over Change-over
H H
100 100
YH
YHC
0 0
SpH SpH
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 8.1.4 .
RXB (KNX) application library
Control sequences
Send heartbeat
yes
Q1
B1
T
Y Output signal
C C
TR Room temperature
SpH Effective heating setpoint
H Heating sequence
YHC
YH Heating valve (radiator)
YHC Heating/cooling valve (fan coil)
B1 Return air sensor
Q1 Fan
TR [°C] TR [°C]
SpC SpC
FNC Description of functions for FC-10, FC-11, FC-12
Value
Floating point (kW)
CM110385en_05
28 Feb 2009