<div>Dear All,</div><div> </div><div>A couple of labs in an educational building I'm modeling have 10 VAV terminal units connected to a 100% OA make-up air unit on the roof. The make-up air unit is DX cooling and Gas heating, providing preconditioned air to the VAV terminal units equipped with electrical heaters. The labs contain fumehood/snorkel exhausts. I'm still in the wizard mode trying to configure the system accurately to start with. I have a couple of questions:</div>
<div> </div><div>1. As one unit serving several VAV terminal units, the make-up air unit is neither a packaged or split single zone DX with furnace, nor a Packaged multizone with furnace. One workaround I can think of is to model both the labs with the 10 terminal units combined as one zone, but not sure if this is the best approach.<div>
2. Its a 100% OA system with no return but I can't seem to select a "no return" option, the only available options for return air path are direct/ducted/plenum. Can this only be dealt with in the detailed interface, and if so, how?</div>
<div> </div><div>Thanks for your help,</div><div> </div><div>Ramana Koti.</div></div>