Hello, I would like to say first that so far the forum has been very
helpful!

I am trying to model a CV system as a base case and then a VAV as a change
case. In the DD Wizard I am using the Multi-zone system with HW heat. For
a CV system I set the minimum VAV to 100% and set the fans to vane-axial.
For the VAV system I am going back and setting the minimum to 30% and the
fans to VSD.

I feel the CV system is fairly close, but the VAV system is coming up with
too low of a gas consumption (A 70% difference).

1. Am I taking the proper approach?

2. What would cause this large of a change? (A decrease in OA
required?)

Thank you for any help you can give me,

Jordan Goldsmith, E.I.T.