Hi Demba,<br><br>What is the building type and operating schedule? Why the gas furnace as back up to cycle on only at night?<br><br>Carol<br><br><div class="gmail_quote">On Tue, May 18, 2010 at 12:21 AM, Demba Ndiaye <span dir="ltr"><<a href="mailto:Demba.Ndiaye@setty.com">Demba.Ndiaye@setty.com</a>></span> wrote:<br>
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<p class="MsoNormal">Folks, </p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">I have a ground-source heat pump that operates during the
day. At night, the pumps are shut off, and if the space needs heating to
maintain the setback temperature, a gas furnace kicks off. </p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Said otherwise, only the furnace operates to maintain
setback.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">How would you model that?</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">_______________</p>
<p class="MsoNormal">Demba NDIAYE</p>
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<br></blockquote></div><br><br clear="all"><br>-- <br>Carol Gardner PE<br>
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