Siemens Desigo RXB Technical Manual page 433

Two-pipe fan coil with changeover and outside
air damper
Plant diagram
N1 Room controller.
R1 Room unit with temp.
sensor.
B1 Return air sensor.
B2 Outside air temperature
sensor via KNX bus.
D1 Window switch.
D2 Presence detector.
D3 Changeover signal via KNX
bus.
D4 Safety thermostat, outside
air.
Q1 Fan (1... 3-speed).
YHC Heating/cooling valve.
YM Outside air damper.
Operating diagrams
Y Output signal.
TR Room temperature.
TO Outside air temperature.
SpH Effective heating setpoint.
SpC Effective cooling setpoint.
SpEcm Economizer setpoint.
SpFr Risk of frost limit
H Heating sequence.
C Cooling sequence.
YHC Heating/cooling valve.
YM Outside air damper.
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 signal via KNX bus.
• Modulating control of heating/cooling valve.
• Outside air damper for outside air supply.
• Outside air temperature sensor via KNX bus.
• Automatic or manual fan control.
D3
YHC
YM D4
M
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)
FNC10 – Two-pipe fan coil with changeover and outside air damper
Q1
T
B1
T
R1 D1
Y [%]
C
100
min
0
TR [°C]
C
TR [°C]
FNC – Fancoil-Applikationen aus FC-10, FC-11, FC-12
FNC10
K NX
B2
D2
YM
TO [°C]
SpFr SpC
SpEcm
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