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When modeling Built-up VAV systems that include Fan Powered Zone Terminal Boxes, it is a requirement of the DOE-2 engine that you must have at least two zones.
If you did not intend to include Fan Powered Terminal Boxes, navigate to the Zone level of the tree, and select the Mechanical tab. You can now click on the Zone Terminal and select a different terminal box from the library, or you can edit your terminal box and change the type of box.
If you did intend to include Fan Powered Terminal Boxes, you just add an additional Conditioned Zone to this HVAC system (unconditioned zones don’t count).
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