Fan Coils With Damper Control; Four-Pipe Fan Coils With Damper Control (Fnc20) - Siemens Desigo RXB Technical Manual

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8.2

Fan coils with damper control

In FNC20, a single damper actuator is used for control of both heating and cooling.
8.2.1

Four-pipe fan coils with damper control (FNC20)

In application FNC20, which uses a damper instead of a valve for modulating control of
the room temperature, a constant volume of water flows through the two heat
exchangers. Depending on the demand, the air flow is guided either through the
heating coil or through the cooling coil, causing a change in the resulting mixed air
temperature.
Y [%]
H
N
100
0
SpH SpC
The heat-exchanger configuration may call for asymmetric runtimes for heating and
cooling; these can be set individually. At the mid-point where the air flow switches from
heating to cooling, the time period associated with the mechanical dead band can also
be preset.
Select Sequences .
RXB (KNX) application library
Control sequences
C
Y
Damper position
TR
Room temperature
SpH
Effective heating setpoint
YM
SpC
Effective cooling setpoint
H
Heating sequence
N
Dead band (recirculated air)
C
Cooling sequence
YM
Damper actuator
TR [°C]
FNC Description of functions for FC-10, FC-11, FC-12
CM110385en_05
28 Feb 2009

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