Siemens Desigo RXB Technical Manual page 439

Four-pipe fan coil with 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 Safety thermostat, outside
air.
Q1 Fan (1... 3-speed).
YH Heating valve.
YC 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.
YH Heating valve.
YC Cooling valve.
YM Outside air damper.
Q14 Fan speed 1.
Q24 Fan speed 2.
Q34 Fan speed 3.
Siemens
Building Technologies
• Heating and cooling with LTHW and cooling with CHW.
• Modulating control of heating and cooling valve.
• Outside air damper for outside air supply.
• Outside air temperature sensor via KNX bus.
• Automatic or manual fan control.
YC
YH
YM
D3
M
N1
K N X
R
Y [%]
H
100
YH
0
SpH SpC
Y
H
Q34
Q24
Q14
SpH SpC
RXB application library (KNX)
FNC12 – Four-pipe fan coil with outside air damper
Q1
T
B1
T
R1
Y [%]
C
100
YC
min
0
TR [°C]
C
TR [°C]
FNC – Fancoil-Applikationen aus FC-10, FC-11, FC-12
FNC12
K NX
B2
D1 D2
YM
SpFr
SpC
SpEcm
CM110672en_03
R
TO [°C]
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30.11.2007