[Equest-users] Heating is not on for System Type Pkgd Va

[Jing Hong]

Thank you Daric and John!!!!!
Choosing Package VAV is the trigger for the error. I changed it to PVVVT
and it worked! With minimal unmet hours. You guys saved my life. LOL. I
have tried everything I googled out these days.

Thank you!!!

Jing

On Tue, Nov 13, 2018 at 4:06 PM Daric Adair <
Daric.Adair at hendersonengineers.com> wrote:

> Jing;
>
>
>
> John Aulbach is right on.
>
> This may be an issue of modeling vs reality then. With a ‘Packaged VAV’
> eQuest believes that there are VAV boxes downstream, so it will put out
> cold air to provide cooling and depend on the VAV Boxes to reheat and
> prevent over-cooling.
>
>
>
> You may want to try a PVVVT system since that requires specifying a
> control zone, and that will allow the System to provide hot/cold air based
> on the control zone. The other 2 zones will be slaved along to them,
> providing either heating or cooling – whatever the control zone dictates it
> needs. But it doesn’t require VAV boxes (as your system doesn’t have them)
>
>
>
> The Thermostat Control should not enable/disable/prevent heat. A Single
> Max VAV system uses ‘Proportional’ and a Dual Max VAV System needs ‘Reverse
> Acting’. Proportional just allows eQuest to provide CFM up to the max
> durring cooling and turn down to the minimim ratio as coolng load ecrease
> and then jump to the minimum heating ratio (if a dual min box. If single
> min box, then the min ratio and min-heatig-ratio will be the same). Reverse
> acting just means that as the heating load increases, the box can allow
> more airflow up to the Heating Maximum Airflow (making it a dual max box.)
>
>
>
> The main issue may be the incorrect system type in eQuest vs the actual
> system type that is attempting to be modeled.
>
>
>
>
>
>
>
> Thanks,
>
> *DARIC R ADAIR* PE, CEM, BEMP
> Mechanical Engineer, Energy Analyst
>
> *Henderson Engineers*
>
> daric.adair at hendersonengineers.com
>
> *Licensed in* KS
>
>
>
> *From:* John Aulbach <jra_sac at yahoo.com>
> *Sent:* Tuesday, November 13, 2018 4:01 PM
> *To:* Jing Hong <hongjing.shirley at gmail.com>; Jing Hong via Equest-users <
> equest-users at lists.onebuilding.org>; mbusman04 at gmail.com
> *Cc:* equest-users at lists.onebuilding.org; Daric Adair <
> daric.Adair at hendersonengineers.com>; equest-users at onebuilding.org
> *Subject:* Re: [Equest-users] Heating is not on for System Type Pkgd Va
>
>
>
> reheat You need a reheat coil for VAV !!!
>
> Sent from Yahoo Mail on Android
> <https://go.onelink.me/107872968?pid=InProduct&c=Global_Internal_YGrowth_AndroidEmailSig__AndroidUsers&af_wl=ym&af_sub1=Internal&af_sub2=Global_YGrowth&af_sub3=EmailSignature>
>
>
>
> On Tue, Nov 13, 2018 at 1:59 PM, Jing Hong via Equest-users
>
> <equest-users at lists.onebuilding.org> wrote:
>
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