Seasonal Ventilation in OpenStudio: Outdoor Air Flow Rate Fraction Schedule has no effect

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Hello,

I want to model ventilation that only occurs in the non-heating season in OpenStudio for ideal airloads. For that I have implemented a Design Specification Outdoor Air Object in the Spaces Properties Tab as I assume this to be modeling ideal ventilation (the name is not very self-explanatory). To model the seasonal dependency of the ventilation I have set a schedule (called Ventilation, Non-Heating Season) but no matter what I do the schedule doesnt have any effects on the simulated volume flow associated with the ventilation. The ventilation should be turned off from October to May. What am I missing here?

Best Moritz