Hi, I have a fairly large model (of an existing building) which has an AFN for night-time cooling as well as a mechanical ventilation system and (of course) a heating system via 'LowTemperatureRadiant' surfaces (floor heating system, DistrictHeating:Water). Some of the rooms in the building are not directly connected to the ventilation system (they have openings to adjacent zones and are 'indirectly' ventilated by these - and are accordingly integrated into the AFN), so do not have ducts etc. But they do have floor heating. For the objects

ZoneHVAC:EquipmentConnections

I need to give 'Zone Return Air Node or NodeList Name'. However, for the zones not directly connected to the ZoneHVAC via ducts etc. I have not found a method to do this.

What I would likely need is a component ("equipment") for ZoneHVAC of the type "overflow opening" or "overflow orifice". However, none of the available components seems to match this simple type.

Any ideas appreciated.

Best Achim