[Equest-users] OA damper barely modulating

[Patrick O'Donnell]

Hi all,
I had similar OA damper question last week which the OA damper was stuck
open with 100% OA (which was resolved thanks to the board!)  I have a
new issue...

The system is a: boiler + chiller + VAV with HW reheat and air-side
economizer.   The problem is the OA damper is open about the same %
(about .45 which is equal to the min dsn OA CFM) whenever the air-side
system is operating in my hourly reports all year.  I am thinking that
this should open up close to 100% at least some times of the year and
close back down to min OA during unoccupied modes, etc.  The as-designed
system is capable of it I am just don't think my model is set up to work
that way.

I am thinking with this as-designed system, I have gotten over zealous
with modifying defaults and have not entered or incorrectly entered some
values on cooling/heating controls, OA, economizer, or a combination of
a few things.  I have manipulated all of these things trying to figure
this out but without luck.

Could someone please take a quick look at the model attached and let me
know if they see anything suspect?  Your input and help is greatly
appreciated! Thanks,  


-Patrick

 <<Retail1.inp>>  <<Retail1.pd2>> 
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