[Equest-users] CW Loop reset

[Mike Hall]

Better yet, I'll tell you how...place the commands below just before the
equipment you want to disable the limits.
"   DIAGNOSTIC NO-LIMITS
    .."

MH

On Tue, Apr 6, 2010 at 11:29 AM, Jeremy McClanathan <
jmcclanathan at cdiengineers.com> wrote:

>   Mike,
>
>
>
> Sorry, I don’t have an answer to your question.  Instead, I have a
> request.   I’ve been looking for a way to disable the error caused by
> condenser water below 65 deg and can’t find the archives that discuss this
> topic.  Would you mind sending me a link to the discussions you found about
> this subject?
>
>
>
> Thank you,
>
>
>
> Jeremy
>
>
>
> *From:* Mike Hall [mailto:darby.hall.mike at gmail.com]
> *Sent:* Monday, April 05, 2010 4:12 PM
> *To:* equest-users at lists.onebuilding.org
> *Subject:* [Equest-users] CW Loop reset
>
>
>
> Hi All,
>
>
>
> I am modeling a VAV system using water cooled DX air handlers on four of
> five floors.  24/7 load spaces use CHW fan coil units and the entire fourth
> floor uses chilled water VAV air handler.  Each DX VAV has an economizer
> coil so hours in the winter when the CW temp is low enough the internal zone
> receives free cooling.  The entire chilled water loop also has a water-side
> economizer so all the chilled water equipment can recieve free cooling.
>
>
>
> As seen by the elec consumption graphs I'm having a problem with the CW
> loop control strategy.  Either the loop operates at the commanded setpoint
> of 85 deg.  Which means there is no free cooling.  Or when I try to use
> OA-Reset the cooling loads during the winter are met via free-cooling but
> during the summer the chiller barely runs and the cooling tower tries to
> meet the load of the CHW loop.
>
> I was able to find the way to disable the error caused by condenser water
> below 65 deg thanks to post from board veterans like Mike TIllou, Steve
> Gates, John Albach, and others).  I do not know what else to try.
>
> Thanks,
> MH
>
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