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To control the outdoor air through your VAV you can use the outdoor air controller object. In here there is the minimum limit type, if you put that at "fixedMinimum" and then the Minimum Outdoor Air Schedule Name to a Factional Schedule, 0 off 1 on, then during the times you have put 0 in your fractional schedule there will be no outdoor air flow through your system. See picture of input below:

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To make sure that your outdoor air flow is off you can report out the system node flow rates and check the flow rates through the supply node on your OAM object.