Operating Instructions

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Siemens RXB application library (KNX) RXB – Fan coil applications from FC-10, FC-11, FC-12, FC-13 CM110672en_05
Building Technologies 7BFNC12 – Four-pipe fan coil with outside air damper 2013-06-07
Four-pipe fan coil with outside air damper
FNC12
• 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.
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.
10385S20
M T
YM
B1
YC
YH
Q1
B2
N1
R1
D1 D2
T
D3
KNX
R
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.
100
0
TR [°C]
Y [%]
SpH SpC
YC
YH
H
C
10385D47
TO [°C]
Y [%]
SpC
100
0
SpEcm
SpFr
min
10385D48
YM
TR [°C]
Y
H
C
Q14
Q24
Q34
SpH SpC
10385D49