Notes
Siemens
Building Technologies
8.3
Fan coils with an electric heating coil
This function will be implemented later.
8.4
Fan coils with an electric reheater
In addition to controlling heating and/or cooling valves, some applications also provide
an output for the control of an electric heating coil. This is then operated as a reheater ,
i.e. it only comes into operation when the heating valve is fully open.
• With motorized actuators, the electric reheater is only enabled when the heating
valve is fully open.
• In the case of thermal actuators, the electric reheater is not enabled until the thermal
actuator has been operated at maximum flow (100%) for at least 2 minutes.
• The switching differential is fixed at 1.0 K.
8.4.1
4-pipe fan-coils with electric reheater
YR
YC
YH
1-step
YR
Y
1 K
H
100%
ON
0%
OFF
RXB (KNX) application library
Control sequences
D3
Q1
T
B1
YH
YC
TR [°C]
SpH
SpC
FNC Description of functions for FC-10, FC-11, FC-12
Y
Output signal
TR
Room temperature
SpC
Effective cooling setpoint
SpH
Effective heating setpoint
H
Heating sequence
C
Cooling sequence
YH
Heating valve
YC
Cooling valve
YR
Electric reheater
D3
Safety thermostat
B1
Return air sensor
Q1
Fan
Modulating
YR, Y
H
100%
YR
YH
0%
SpH
SpC
CM110385en_05
YC
TR [°C]
95/166
28 Feb 2009