Control Sequences; Fan Coils With Valve Control; Four-Pipe Fan Coils - With Valve Control - Siemens Desigo RXB Technical Manual

Actuator type
Siemens
Building Technologies
8

Control sequences

8.1

Fan coils with valve control

8.1.1

Four-pipe fan coils - With valve control

The applications for 4-pipe fan coils each have a proportional heating and proportional
cooling sequence. The controllers operate with a PI algorithm optimized for thermal or
motorized valve actuators. (For simplicity, the diagrams below only show the P-control
action).
YC
YH
The control sequences come into operation at the effective setpoints for heating and
cooling (see page 69).
Y [%]
H
100
YH YC
0
SpH SpC
Different applications support different valve actuators, and these do not all require the
same number of outputs on the controller. The tool displays the actuators suitable for
the selected application. Selection occurs at the engineering stage (see page 85).
RXB (KNX) application library
Control sequences
Q1
T
B1
Y
TR
C
SpH
SpC
H
C
YH
YC
B1
TR [°C]
Q1
FNC Description of functions for FC-10, FC-11, FC-12
Output signal
Room temperature
Effective heating setpoint
Effective cooling setpoint
Heating sequence
Cooling sequence
Heating valve
Cooling valve
Return air sensor
Fan
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28 Feb 2009