less outdoor air flow rate, increased gas consumption

asked 2016-07-05 17:36:52 -0500

elvin's avatar

updated 2021-05-07 09:40:57 -0500

hello, I have a 100% OA HVAC system. When I change the min OA flow rate to a small value and make maximum flow rate autosized in controller:outdoor air object, somehow I get increased gas consumptipn. I couldn't find a reason why its happening because with less OA, system should use more return air so there should be gas saving especially in winter months.

Thank you


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So you were hard sizing the maximum OA before?

Adam Hilton's avatar Adam Hilton  ( 2016-07-06 09:59:04 -0500 )edit

Before minimum and maximum outdoor air flow rate were hard sized.

elvin's avatar elvin  ( 2016-07-06 11:06:01 -0500 )edit

And you're certain it was above the ventilation requirement that you've specified?

Adam Hilton's avatar Adam Hilton  ( 2016-07-06 11:07:10 -0500 )edit

correct. Somehow the coils do not operate properly.

elvin's avatar elvin  ( 2016-07-06 13:38:21 -0500 )edit