Operating Instructions
Table Of Contents
- RXB applications library (KNX)
- RXB – Fan coil applications from FC10, FC11, FC12, FC-13
- FNC02 - Two-pipe fan coil with changeover
- FNC03 - Two-pipe fan coil with changeover and electric reheater
- FNC04 - Four-pipe fan coil
- FNC05 - Four-pipe fan coil with electric reheater
- FNC08 - Four-pipe fan coil with room supply air cascade
- FNC10 - Two-pipe fan coil with changeover and outside air damper
- FNC12 - Four-pipe fan coil with outside air damper
- FNC18 - Two-pipe fan coil (changeover) and radiator
- FNC20 - Four-pipe fan coil, controlled by one damper
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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 3BFNC04 – Four-pipe fan coil 2013-06-07
Four-pipe fan coil
FNC04
• Heating with LTHW and cooling with CHW.
• Modulating control of heating and cooling valve.
• Automatic or manual fan control.
Plant diagram
N1 Room controller.
R1 Room unit with temp.
sensor.
B1 Return air sensor.
D1 Window switch.
D2 Presence detector.
Q1 Fan (1… 3-speed).
YH Heating valve.
YC Cooling valve.
10385S12
T
B1
YC
YH
Q1
N1
R1
D1 D2
T
KNX
R
Operating diagrams
Valves
100
0
TR [°C]
Y [%]
SpH SpC
YC
YH
H
C
10385D35
1-2-3 speed fan
Y Output signal.
TR Room temperature.
SpH Effective heating setpoint.
SpC Effective cooling setpoint.
H Heating sequence.
C Cooling sequence.
YH Heating valve.
YC Cooling valve.
Q14 Fan speed 1.
Q24 Fan speed 2.
Q34 Fan speed 3.
TR [°C]
Y
H
C
Q14
Q24
Q34
SpH SpC
10385D36