Siemens Desigo RXB Technical Manual page 405

Two-pipe fan coil with changeover
Plant diagram
N1 Room controller.
R1 Room unit with temp.
sensor.
B1 Return air sensor.
D1 Window switch.
D2 Presence detector.
D3 Changeover signal via KNX
bus.
Q1 Fan (1 ... 3 speeds).
YHC Heating/cooling valve.
Operating diagrams
Y Output signal.
TR Room temperature.
SpH Effective heating setpoint.
SpC Effective cooling setpoint.
H Heating sequence.
C Cooling sequence.
YHC Heating/cooling valve.
Q14 Fan speed 1.
Q24 Fan speed 2.
Q34 Fan speed 3.
Siemens
Building Technologies
• Heating only (with LTHW), cooling only (with CHW) or changeover.
• Changeover via KNX bus.
• Modulating control of heating/cooling valve.
• Automatic or manual fan control.
D3
YHC
N1
K N X
R
Y [%]
Change-over
H
100
YHC YHC
0
SpH SpC
Change-over
Y
H
Q34
Q24
Q14
SpH SpC
RXB application library (KNX)
FNC02 – Two-pipe fan coil with changeover
Q1
T
B1
T
R1 D1
10385D45
C
TR [°C]
10385D34
C
TR [°C]
FNC – Fancoil-Applikationen aus FC-10, FC-11, FC-12
FNC02
K NX
D2
CM110672en_03
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