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Siemens
RDG400KN,RGD405KN Basic documentation
CE1P3192en
Building Technologies
2017-02-17
∂
P19 can be set up to 5000 ppm but the external analog sensor is limited to
2000 ppm. If there is a need to measure above 2000 ppm, a KNX sensor is
required to send the value with the respective object
∂
P19 = OFF switches the IAQ function off
∂
The IAQ value is acquired either via a locally connected CO
2
or VOC
sensor or a CO
2
value via bus (e.g. KNX)
Important note for KNX LTE:
IAQ control does not influence in any way the energy demand air, heating or
cooling (in LTE-Mode).
IAQ control – priority CO
2
control
∂
If the local CO
2
sensor input is configured, the thermostat uses the CO
2
value from the locally connected sensor. Otherwise, the CO
2
value
available on KNX is used for CO
2
control
∂
In case the local CO
2
sensor is configured, but the value is not valid (value
<100 ppm), the thermostat uses the CO
2
value via KNX bus.
If both CO
2
sources do not deliver a valid value, the CO
2
function is
disabled
∂
S-Mode has a higher priority than LTE-Mode
∂
If the CO
2
value comes from the bus, the local (DC 0…10 V) value is not
sent on the bus
∂
Receiving and sending the same S-Mode object is not allowed
∂
The thermostat receives the CO
2
LTE object when the corresponding
geographical zone is selected
The "Fresh air" symbol appears on the screen as soon as the actual CO
2
value exceeds the CO
2
setpoint
.
The IAQ level can be shown on the LCD.
3 choices are available:
∂
P07 = 0 No display
∂
P07
=
6 CO
2
concentration shown as ppm
∂
P07 = 7 CO
2
concentration shown in the form of symbols
Selection P07 = 6: CO
2
concentration in ppm
The CO
2
concentration is shown on the second line with the ppm symbol.
Minimum display: 100 ppm
Maximum display: 5000 ppm
Display: IAQ function
Parameter
Name
Factory setting
Range
P07
Additional display
information
0 (RDG405KN only)
0 = --- (no display)
1 = °C and °F
2 = outside temperature (via bus)
3 = time of day (12 h) (via bus)
4 = time of day (24 h) (via bus)
6 = CO
2
concentration [ppm]
7 = CO
2
symbols
