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[EnergyPlus_Support] Multiple HVAC systems serving one zone

I am having some difficulty setting up multiple HVAC systems serving one zone.  The situation is that I am modeling a building with packaged rooftop units as well as exhaust fans.  However, I can't model the exhaust fans using the exhaust fan object because the exhaust fans are controlled based on enthalpy differential with outdoor air (as I understand it, exhaust fan availability managers only allow temperature differential).

So I thought I would set up another HVAC system in addition to the RTUs that would function like the exhaust fans (with a supply fan, rather than exhaust, no heating or cooling coils).  I could then use an outside air controller to specify the enthapy differential control. The issue I am having is setting up both systems to serve one zone.  Do I connect the second system (exhaust system)to the zone inlet node, or upstream of the zone splitter associated with the RTUs?  Where do I connect downstream of the zone?

Any help would be much appreciated.  Of course, if anyone has a way of getting the exhaust fan object to run on differential enthalpy, I would take suggestions there too!!



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