Demand Control Ventilation
Demand Control Ventilation, or CO2 control, or IAQ control, is the most complicated control strategy in the BMS. It is important, even if you do not have CO2 sensors, IAQ sensors, or outside air volume controls.
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The main outside air damper should not open 100% on high CO2
Demand Control Ventilation does not work in older buildings
VAV AHU Return air fan tracking (major part of CO2 control)
A separate minimum outside air damper may not help?