Modelling an Air-to-air Split System

Hi, I am trying to use Ironbug to simulate a mechanical ventilation unit with heat recovery (no heating/cooling), as well as a separate air-to-air split system that provides the space conditioning.

However, I appearing to be encountering issues when modelling the air-to-air split system. I’ve scoured the similar topics on the forum, such as those here and here. Though I still get the same issue, where the OSM simulation fails due to Coil:Cooling:DX:SingleSpeed missing required property “air_inlet_node_name” and “air_outlet_node_name”.

Can anyone please give me a pointer. I’ve attached a simplified grasshopper model which highlights the issue. Any assistance would be amazing!
Split system in (43.0 KB)