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Access 5.x |
Fan start/stop |
When the function is activated with start/stop function and the CO2 value rises above settable start value, the fans will start at configured speed, if they are not already running.
The fans will stop when the CO2 value falls to a settable hysteresis (default: 160 ppm) below the start value and after the minimal time for CO2 control has passed.
Configuration example for air quality control (Fan start/stop CO2) |
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Variable |
Available options & Selection |
Note |
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Activate function |
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Configuration > Functions > Function activation |
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Air quality control |
| No | Fan start/stop function | | Mixing damper function | | Fan start/stop + Mixing damper | |
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Configuration of the air quality control function |
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Configuration > Functions > Air quality control |
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Run extract air fan during air quality control |
| Yes | No | |
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Setpoint supply air fan when air quality control |
| Low speed | Normal speed | High speed | |
Switch to the selected fan level |
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Setpoint extract air fan when air quality control |
| Low speed | Normal speed | High speed | |
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Control type |
| CO2 | RH | |
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Configure inputs |
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Configuration > I/O allocation settings > Analog inputs |
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CO2 room /extract air |
Any available I/O |
CO2/VOC sensor |
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Operational settings |
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Data & Settings > Demand control > Air quality control |
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CO2 room /extract air |
___ ppm |
Measured CO2 |
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Start limit fan start/stop |
[800] ppm |
Mode activates when CO2 level exceeds 800ppm Mode deactivates when CO2 level reduces below 800-160=640 ppm |
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Stop hysteresis fan start/stop CO2 |
[160] ppm |
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Min time for CO2 control |
[20] min |
Once activated, the air quality control will remain active for at least 20 min |
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Demand control |
Off | On |
Off - mode inactive | On - Mode active |
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The previously described principal applies if RH is chosen as a control type.
Configuration example for air quality control (Fan start/stop Relative humidity) |
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Variable |
Available options & Selection |
Note |
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Activate function |
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Configuration > Functions > Function activation |
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Air quality control |
| No | Fan start/stop function | | Mixing damper function | | Fan start/stop + Mixing damper | |
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Configuration of the air quality control function |
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Configuration > Functions > Air quality control |
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Run extract air fan during air quality control |
| Yes | No | |
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Setpoint supply air fan when air quality control |
| Low speed | Normal speed | High speed | |
Switch to the selected fan level |
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Setpoint extract air fan when air quality control |
| Low speed | Normal speed | High speed | |
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Control type |
| CO2 | RH | |
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Configure inputs |
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Configuration > I/O allocation settings > Analog inputs |
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Humidity room /extract air |
Any available I/O |
RH sensor |
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Operational settings |
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Data & Settings > Demand control > Air quality control |
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Humidity room /extract air |
___ % |
Measured RH % |
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Start limit fan start/stop RH |
[75] % |
Mode activates when RH level exceeds 75% Mode deactivates when RH level reduces below 75-8=67% |
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Stop hysteresis fan start/stop RH |
[8] % |
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Min time for RH control |
[20] min |
Once activated, the air quality control will remain active for at least 20 min |
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Demand control |
Off | On |
Off - mode inactive | On - Mode active |
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