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 5BFNC08 – Four-pipe fan coil with room supply air cascade 2013-06-07
DC 0...10 V fan
YC... Output signal (fan / valve)
TR Room temperature
Sp Effective setpoint (H/C)
0% / 4% Hysteresis for fan start
with min. speed
Smin Min. fan speed (H/C)
Smax Max. fan speed (H/C)
OfsFan Offset for fan start
XpFan P-band for fan operation
FanStartDmd Valve position for
fan start
Fan in sequence
Fan in parallel
Application FNC08 includes the following functions
(refer to the description of functions CM110385 for detailed information):
Function Brief description)
Four-pipe fan coil. – PI control.
– Two proportional control sequences, heating and cooling.
– Control of motorized or analog valve actuators (AC 24 V, 3-position / CD 0...10 V).
– Control of motorized KNX bus actuator valves.
– Room supply air cascade.
– Valve exercising feature.
Fan control. – Automatic (1...3-speed / analog)
– Manual with room unit.
Temperature measurement. – Room temperature sensor and
– Supply air temperature sensor.
Room operating modes. – Comfort, Precomfort, Economy and Protection mode..
– Change of operating mode via
/Auto switch on room unit, presence detector,
window contact or central command.
Setpoint shift.
– Locally via room unit or centrally.
General functions. – Presence detector.
– Window switch.
– Master/slave operation.
– Boost heating, night cooling etc.
– Free inputs/outputs.
Room units. Available with temperature sensor, setpoint adjuster,
button for /Auto and fan speed control, and LCD display.
Compatible controllers.
FNC08 is supplied with RXB21.1/FC-10 and RXB39.1/FC-13.
Functions
100%
0%
Fan
Valve
S
maxH
S
minH
Sp
CC
mf
Sp
HCmf
S
max
C
TR
S
min
C
YC...
4%
0%
FanStartDmd
Heat
FanStartDmd
Cool
100%
0%
Fan
Valve
S
maxH
S
minH
Sp
CC
mf
Sp
HCmf
S
max
C
TR
S
min
C
X
PFanH
Ofs
FanH
X
PFanC
Ofs
FanC
YC...
4%
0%