Cycling Fans At night

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I have been using eQuest v3.63 for several energy models in the Design
Development Wizard Mode. I noticed something strange when testing the
effect of the "Cycle Fans at Night" pull down menu that happens across
all the models I'm working on. It seems that the "No Fan Cycling" option
causes the whole HVAC system to shut down when the building is
unoccupied regardless of unoccupied thermostat settings. I saw this in
the hourly report generated in excel by the detailed output report. This
causes the building to use less energy than if the fans are set to
cycle. Can anyone confirm or deny this problem or give any guidance on
it's cause?

Also, when "Cycle Fans (no OA at night)" is selected the hourly report
indicates the system behaves as expected.

Jacob Goodman , LEED AP, Green Building Specialist

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Joined: 2011-01-13
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