Hi @milog ,
I’ll admit that I don’t really understand what you or the manufacturer mean when you say that it does “space heating/cooling via supply air” but I’m going to take this to mean that there’s no heating or cooling coil within this ventilation air stream and the unit is only doing MVHR with a fan and an enthalpy wheel. Here’s a sample of an IronBug HVAC that’s just doing MVHR:
shoe_box_mvhr_ironbug.gh (64.7 KB)
… and you can see that this translates to a single air loop with the constant volume fan, a heat exchanger representing the enthalpy wheel, and a setpoint manager that is targeting 21.1 C:
I can also see that this make things a bit more bearable in the room (albeit only by a small amount). Here are the temperatures when the Room has no MVHR unit:
And here is what they are like with the unit:
Hope that helps and just let me know if there’s something I am misunderstanding about this system.