Operating Instructions

3/54
Siemens RXB application library (KNX) RXB – Fan coil applications from FC-10, FC-11, FC-12, FC-13 CM110672en_05
Building Technologies 1BFNC02 – Two-pipe fan coil with changeover 2013-06-07
Two-pipe fan coil with changeover
FNC02
• 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.
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.
T
B1
Q1
N1
R1
D1 D2
T
YHC
D3
KNX
R
10385S10
Operating diagrams
Valves
100
0
TR [°C]
Y [%]
SpH SpC
Change-over
YHCYHC
H
C
10385D45
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.
YHC Heating/cooling valve.
Q14 Fan speed 1.
Q24 Fan speed 2.
Q34 Fan speed 3.
10385D34
Change-over
TR [°C]
Y
H
C
Q14
Q24
Q34
SpH SpC