<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<meta name="Generator" content="Microsoft Word 14 (filtered medium)">
<!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style><![endif]--><style><!--
/* Font Definitions */
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
pre
{mso-style-priority:99;
mso-style-link:"HTML Preformatted Char";
margin:0in;
margin-bottom:.0001pt;
font-size:10.0pt;
font-family:"Courier New";}
p.MsoAcetate, li.MsoAcetate, div.MsoAcetate
{mso-style-priority:99;
mso-style-link:"Balloon Text Char";
margin:0in;
margin-bottom:.0001pt;
font-size:8.0pt;
font-family:"Tahoma","sans-serif";}
span.HTMLPreformattedChar
{mso-style-name:"HTML Preformatted Char";
mso-style-priority:99;
mso-style-link:"HTML Preformatted";
font-family:"Courier New";}
span.BalloonTextChar
{mso-style-name:"Balloon Text Char";
mso-style-priority:99;
mso-style-link:"Balloon Text";
font-family:"Tahoma","sans-serif";}
span.EmailStyle21
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:windowtext;}
span.EmailStyle22
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;
font-weight:normal;
font-style:normal;
text-decoration:none none;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="EN-US" link="blue" vlink="purple">
<div class="WordSection1">
<p class="MsoNormal"><span style="color:#1F497D">Not sure if this is the reason, but the three units you mentioned all have “no” as the value for lockout compressor in the economizer tab. Try turning these to yes and see if it solves the problem.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal" style="text-autospace:none"><b><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#DCAA2C"><o:p> </o:p></span></b></p>
<p class="MsoNormal" style="text-autospace:none"><b><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:gray">Vikram Sami</span></b><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:gray">, LEED AP BD+C<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:gray">Sustainable Design Analyst<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:gray">1315 Peachtree St. NE, Atlanta, GA 30309<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:gray">t: 404-443-7462 f:
</span><span lang="ES" style="font-size:9.0pt;font-family:"Arial","sans-serif";color:gray">404.892.5823 </span><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:gray"> e: vikram.sami@perkinswill.com
</span><span style="color:#1F497D"><a href="http://www.perkinswill.com/"><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:gray;text-decoration:none">www.perkinswill.com</span></a></span><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:gray"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:3.0pt;text-autospace:none"><b><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:gray">Perkins+Will.</span></b><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:gray">
</span><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:#ADD425">Ideas + buildings that honor the broader goals of society</span><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:green"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
</div>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>Jeremy N. Rapoza<br>
<b>Sent:</b> Wednesday, December 21, 2011 1:54 PM<br>
<b>To:</b> 'equest-users@lists.onebuilding.org'<br>
<b>Subject:</b> [Equest-users] Compressor usage with economizer<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">All,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am currently having a problem where the compressors on my DX units are still kicking on during the Winter months even though I have an OA economizer. This change in results happened after I added Demand Control Ventilation as a parametric
run. The overall savings were greater, but I was surprised how much cooling increased in the winter. My design is using Bridgeport, CT weather.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have attached the .pd2, .inp, and .prd files. My concern is only for units labled RTU-1, AHU-2, and AHU-3. Please ignore all the little PSZ’s.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have done a thorough search through the archives and have found this
<a href="http://lists.onebuilding.org/htdig.cgi/equest-users-onebuilding.org/2008-November/000614.html">
link</a> to be the most similar to my problem, but I don’t see any resolutions that fully fixed my problem.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Here are two of the screen shots of how I set up RTU-1, which is essentially the same as the 2 other units:<o:p></o:p></p>
<p class="MsoNormal"><img border="0" width="480" height="342" id="Picture_x0020_1" src="cid:image001.jpg@01CCBFF0.3A4EA2B0"><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><img border="0" width="539" height="314" id="Picture_x0020_2" src="cid:image002.jpg@01CCBFF0.3A4EA2B0"><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Other notes: I only have a few unmet hours. SS-A report will show that winter cooling is more of a problem with RTU-1 and AHU-3. AHU-2 happens to be a 100% OA unit for Kitchen makeup and it has much less winter cooling load (not surprising
since it is 100% OA so it is ‘economizing’ all the time. I also have modeled this project in Trace and the results in Trace have no winter cooling as expected (this project is a training exercise for me in eQuest.)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Any help is appreciated.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:8.5pt;font-family:"Arial","sans-serif";color:gray">Jeremy Rapoza, P.E., LEED AP, Design Engineer</span><b><span style="font-size:8.5pt;font-family:"Arial","sans-serif";color:#0000A0">I BVH Integrated Services I</span></b><b><span style="font-size:8.5pt;font-family:"Arial","sans-serif";color:black">
</span></b><span style="font-size:8.5pt;font-family:"Arial","sans-serif";color:gray">860.286.9171 tel
</span><b><span style="font-size:8.5pt;font-family:"Arial","sans-serif";color:#0000A0">I</span></b><b><span style="font-size:8.5pt;font-family:"Arial","sans-serif";color:gray">
</span></b><span style="font-size:8.5pt;font-family:"Arial","sans-serif";color:gray">860.242.0236 fax</span><span style="font-size:8.5pt;font-family:"Arial","sans-serif";color:#0000A0"> <b>I</b></span><b><span style="font-size:8.5pt;font-family:"Arial","sans-serif";color:gray">
</span></b><span style="font-size:8.5pt;font-family:"Arial","sans-serif";color:gray">50 Griffin Road South, Bloomfield CT 06002
</span><b><span style="font-size:8.5pt;font-family:"Arial","sans-serif";color:#0000A0">I
<a href="http://www.bvhis.com/" title="http://www.bvhis.com/"><span style="font-weight:normal">www.bvhis.com</span></a></span></b><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<br>
<font face="Arial" color="Gray" size="1">This email and any files transmitted with it are confidential and intended solely for the addressee. If you are not the named addressee you should not disseminate, distribute, copy, or alter this email.<br>
</font>
</body>
</html>