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
Application FNC12 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 thermal valve actuators (AC 24 V, PDM).
– Control of motorized KNX bus actuator valves.
– Outside air damper.
– Valve exercising feature.
Fan control.
– 1...3-speed automatic.
– Manual with room unit.
Temperature measurement. – Room temperature sensor or
– Return air 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.
– Free inputs / outputs
Room units. Available with temperature sensor, setpoint adjuster,
button for /Auto and fan speed control, and LCD display.
Compatible controllers.
FNC12 is supplied with RXB21.1/FC-11.