<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Hi Daric- did you get this resolved in your model file?</div><div><br></div><br id="lineBreakAtBeginningOfSignature"><div dir="ltr">Pasha<div>Ph: 308-763-1593</div></div><div dir="ltr"><br><blockquote type="cite">On May 8, 2025, at 12:00 PM, Daric Adair via Equest-users <equest-users@lists.onebuilding.org> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr">
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;mso-ligatures:none">Tanmay – thanks for the idea. I’ve played with that and have it set up at 90F to match the Max-Supply-Temp. It’s like eQuest is just ignoring the call for heating / not modulating
the fan increase.</span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:#000001">DARIC ADAIR</span></b><b><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:#000001;mso-ligatures:none"><o:p></o:p></span></b></p>
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<p class="MsoNormal"><b><span style="font-family:"Calibri",sans-serif;mso-ligatures:none">From:</span></b><span style="font-family:"Calibri",sans-serif;mso-ligatures:none"> Kulkarni, Tanmay @ Chicago <Tanmay.Kulkarni@cbre.com>
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<b>Sent:</b> Thursday, May 8, 2025 11:47 AM<br>
<b>To:</b> Daric Adair <Daric.Adair@hendersonengineers.com><br>
<b>Subject:</b> RE: PVVT Heating Airflow modulation<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hi Daric,<br>
<br>
Try resetting your hot deck leaving temps to 55 or higher. If this value is not specified, the terminal units will struggle to meet setpoints.<br>
<br>
Thanks!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span style="font-family:"Calibri",sans-serif;mso-ligatures:none">From:</span></b><span style="font-family:"Calibri",sans-serif;mso-ligatures:none"> Equest-users <<a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a>>
<b>On Behalf Of </b>Daric Adair via Equest-users<br>
<b>Sent:</b> Thursday, May 8, 2025 11:22 AM<br>
<b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> [Equest-users] PVVT Heating Airflow modulation<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p><strong><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:white;background:#065F3D">External</span></strong><o:p></o:p></p>
<p> <o:p></o:p></p>
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<p class="MsoNormal">Hoping someone can untangle my confusion.<o:p></o:p></p>
<p class="MsoNormal">Have an eQuest model where the PVVT systems will not increase the heating airflow up above the minimum flow ratio causing significant unmet hours (1,000s). This occurs with both auto-sized and hard sized airflows & capacities, so its not
a capacity issue. If the min-flow-ratio is set to 30% (as per design) and reverse acting t-stat the heating airflow does not increase. I can ‘force’ the heating airflow increase by specifying the heating-min-flow ratio, but that’s not really the design. Checking
with wizard, the default min-flow-ratio is 0.67. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I can’t see or think of anything that would prevent the system from increasing its airflow and heating output to increase to meet the load. Hourly report for the ‘amount of heating needed to hold setpoint’ show the need heating capacity
is less than the system capacity and that the model recognizes there is a heating need – but will not allow airflow & heating output to increase.<o:p></o:p></p>
<p class="MsoNormal">Initially thought this was a custom schedule or other ‘junk’ in the model, but this is occurring even with a dummy wizard model. The PVVT system(s) wont increase airflows from the min-flow-ratio in heating even with reverse acting t-stats.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">What could be causing the model to not increase airflow in heating when the capacities are sufficient?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
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