Overriding The Outside Air Damper; Room Supply Air Cascade Control (Fnc08) - Siemens Desigo RXB Technical Manual

K N X
CO
R
Note
Note!
STOP
108/166
Siemens
Building Technologies
8.6.4

Overriding the outside air damper

For test purposes, the outside air damper can be overridden via the following
communication objects:
Damper override (Input communication object)
Flags Type
R W K T U
0 1 1 0 0 8.010
DPT_Percent_V16
Before the outside air damper can be overridden, the test mode must be activated via
the communication object Application mode (see page 128).
8.7

Room supply air cascade control (FNC08)

Room supply air cascade control makes it possible to reach the required room
temperature very quickly. On the basis of the measured room temperature, the
controller calculates a setpoint for the temperature at the air outlet of the fan coil.
A limit value can be applied to this temperature to prevent the introduction of
uncomfortably cold / warm air into the room.
This function is not available for electric heaters, as these cannot be controlled well
enough with RXB controllers.
T
Room sensor
Room
Actual room temp.
Controller
H
room
Setpoints room
C
Setpoints disch. air (internal)
Room controller FNC08
This function is possible in conjunction with motorized valve actuators only .
RXB (KNX) application library
Control sequences
Receive timeout
no
Discharge air
T
sensor
C
H
Fancoil
Max. disch. air
Min. disch. air
Actual
Controller
disch. temp.
disch. air
Positioning
signals
FNC Description of functions for FC-10, FC-11, FC-12
Value
0...100% 0 = 0%
+100 = +100%
+32767 = invalid
CM110385en_05
28 Feb 2009