variable volume flow controller

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I am trying to model a air handeling unit that always runs with 100% outside air.Also the volume flow in the room should be dependent on the CO2 concentration only, not room temperature or anything else. I have already tried it with a SetpointManager:Scheduled and a "ZoneControl:ContainmentController". That it always has 100% outside air works, but the dependency on the CO2 concentration does not. Has anyone of you ever done something like this and an example? Would like to upload a drawing with the scheme of the plant, but it does not work. Would be very grateful for your help.

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