Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
If I understand correctly, which I'm not sure I am, I'd say use an AirLoopHVAC to model the AHU to serve your zone(s) that will provide the fresh air.
The VRF(s) will just condition the zone(s), palce it second in your ZoneHVAC:EquipmentList after the AHU terminal unit, and hardsize the outdoor air flow rate during Cooling/heating/noLoad to zero to ensure it doesn't also bring outside air.
