CO2 air quality override on fan speed
If the user connects a CO2 sensor to the input CO2_Sensor, the air quality P control will enabled automatically. The CO2 setpoint is defined by the parameter CO2-01 and the P-band by CO2-02.
Both parameters have the unit parts per million (ppm).
The total proportional band is shifted below the setpoint, as shown in next figure.
The 0...100% control signal will be applied to the fan speed as shown in the following picture. The sequence can be set with parameters CO2-05...CO2-06.
Note: The end-point parameters must always have a higher value then the start- point parameters. If both start- and end-point parameters of a sequence are set to “0”, then that particular sequence function will be inactive.
The strategy applies the maximum signal of the temperature and CO2 control to the fan outputs.
Description |
Default value |
CO2-01: air quality setpoint; 0 = disable internal controller |
1000 ppm |
CO2-02: air quality P-band |
200 ppm |
CO2-05: sequence start point air quality override fan speed |
50 % |
CO2-06: sequence end point air quality override fan speed |
100 % |