i have heard several different opinions when controlling oa dampers with a co2 sensor.
opinion 1: keep the oa dampers closed (no min position) until co2 sensor demands then modulate to min position.
this does not take into account other iaq concerns.
opinion 2: leave dampers at min 10% then open to 20% on co2 demand.
opinion 3: modulate the dampers up to 100% depending on co2 demand
i understand the type of equipment and oa conditions have a great influence on the control method but would be interested in hearing any opinions.
also bringing in outside air in a major city i.e. buses, traffic, delivery trucks idling, trains , homeless using the alleys for toilets etc. how fresh is fresh air !
i work in the north east.