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The unitary systems have control built into them, so you don't need any setpoint managers unless there are other components outside the unitary that require control. I suggest that you just remove all of the setpoint managers on this system. You do need to select the control zone in the unitary system settings.

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In the situations where you do need specify the mixed air setpoint manager, you can leave the fan inlet / outlet node settings blank and OpenStudio will fill in default values on export to idf format.