Iaq Control (Rdg405Kn Only) - Siemens RDG400KN Basic Documentation

Note
General note
Parameter
P19
P20
Notes
14 / 87
Siemens
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functionality or any other KNX device if the corresponding communication object is
bound.
When engineering with the ETS tool, the time of day can only be displayed on the
RDG400KN when Synco group address 30/3/254 is loaded into the thermostat.
For further details, refer to Basic Documentation [6], "Communication via KNX-bus
for Synco 700", section "Engineering of big systems with ETS".
3.1.2

IAQ control (RDG405KN only)

The IAQ function is used for air quality control on VAV applications. The function is
achieved by controlling the air damper position according to the CO
indoor air as well as the temperature.
Note that the air damper position is also controlled according to the temperature. It
depends on which is higher, the temperature demand or the CO
signal.
The function shall improve the indoor air quality by increasing the volumetric air
flow or VAV output signal respectively.
∂
If the IAQ value of the room is below the preset CO
output signal is controlled in accordance with minimum flow
∂
If the IAQ value exceeds the CO
increased slowly until maximum flow is reached
∂
CO control is activated in Comfort mode only.
2
In Economy and Protection mode, this function is disabled
Vmax is reached, when the IAQ value exceeds the preset CO
CO proportional band (SP+Xp).
2
Object
CO (VOC) setpoint
2
CO (VOC) P-band Xp
2
RDG400KN,RGD405KN Basic documentation
setpoint, the VAV output signal is
2
Description
CO (VOC) setpoint
2
Proportional band between
Vmin and Vmax
level of the
2
level demand
2
setpoint, the VAV
2
setpoint plus the
2
CO
Sp: setpoint [P19]
2
CO proportional
Xp:
2
band
[P20]
Vmin: Minimum flow
Vmax: Maximum flow
Factory
Values
setting
OFF(0)...5000 ppm 1000
10...2000 ppm 400
CE1P3192en
2017-02-17