2-Pipe Fan-Coils With Electric Reheater - Siemens Desigo RXB Technical Manual

Selection of the control
mode
Electric reheater with
cooling-only or
changeover applications
Heating only
or c/o = Heating
Cooling only
or c/o = Cooling
Changeover with
disabled electric
heater
(see page 97)
96/166
Siemens
Building Technologies
8.4.2

2-pipe fan-coils with electric reheater

YR
YHC
The control mode must be selected at the engineering stage:
heating only, cooling only or changeover
The electric reheater also operates with "Cooling only" and "Change-over" in cooling
mode. In this case, the heating setpoint (SpH) is used for control.
1-step
YR
Y
1 K
H
100% ON
0% OFF
YR
Y
H
100% ON
0% OFF
Y [%]
Change-over
H
100
YHC YHC
0
SpH SpC
Further details: see sections 8.1.3 through 8.1.7.
RXB (KNX) application library
Control sequences
D3
Q1
T
B1
YHC
TR [°C]
SpH
1 K
C
YHC
TR [°C]
SpH
SpC
C
TR [°C]
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
YHC Heating valve
YR Electric reheater
Modulating
YR, Y
H
100%
YR
YHC
0%
SpH
YR, Y
H
100%
YR
0%
SpH
CM110385en_05
TR [°C]
C
YHC
TR [°C]
SpC
28 Feb 2009