[Equest-users] OA ratio stuck at 1

[B. Fountain]

I had a quick look at your files.  I believe the issue is in that in the
system - fans tab you have deg_F set rather than static pressure for both
supply & return fans.  Clearing these entries give more normal operation
of the OA dampers.

Hope this helps.

> Hi all,
> I have modeled a simple PSZ with one system per zone.  Problem is that
> my OA damper is "stuck" open (just like the real world hehe or closed
> sometimes!). i.e. no matter what I do I cannot bring in less than 100%
> OA at the system level.  My "Outside Air Ratio" is shown as 1 in the
> detailed report for each zone and I don't know why and I cannot change
> it.
>
> I have tried messing with OA ratio, restoring the defaults, eliminating
> the economizer all together, setting OA to zero at system and zone level
> but nothing seems to change the Outside Air Ratio of 1 or the hourly
> reports showing 100% OA.
>
> With this scenario, one system per zone, my system and zone level are
> essentially the same.  I can adjust my zone-level OA down but for
> example the hourly reports show SA CFM at 1500 and Ratio of OA to SA is
> .9999 for a particular zone and that zone's SA is 1500 CFM which has be
> all OA then, right?
>
> Has anyone encountered this issue?? I have attached .pd2 and input file
> for viewing.  If anyone can tell me how I can turn off 100% OA I would
> be glad to know.   Any other assistance or ideas are appreciated.
> Thanks,
>
> -Patrick
>
>  <<Base1.inp>>  <<Base1.pd2>>
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