How should I set the system to ensure CO2 control?

For demand controlled ventilation systems, change the CO2 setpoint to lower, 400 ppm value, in order to assure the operation at nominal speed. Keep the ventilation on 24 hours a day, 7 days a week, as recommended in BESA VG002 V4 https://www.thebesa.com/media/837990/besa-guidance-vg002-v4.pdf