Simulated OA flow not consistent with requested OA flow VAV system

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Hi all,

I am testing a model representing a laboratory building. I am wanting to test ventilation setbacks to understand its effect on energy savings.

I am getting large discrepancies between the requested level of OA ventilation and the actual airflow delivered to the zone during simulation.

I managed to get around this by using a multiplication factor however, when i include a zone ventilation schedule that requests half the flow rate in unoccupied hrs i get no change in the simulated delivery. is there something else that could be governing the airflow delivered to the zone?

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UPDATE: I have confirmed that the DesignSpecification:OutdoorAir object for the lab zones contains the correct schedule. @MingboPeng @chris is there something else that governs the airflow delivered to the terminal? and is the Zone air terminal outdoor air flow rate the right output to be measuring to investigate the amount of outdoor air being delivered to the zone?

I understand the Terminal sizing could have an effect but i have confirmed that they are being sized correctly and the requested airflow is within their minimum and maximum airflow rates.