<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>There's a great description and picture in the documentation. The pump will turn on when Th-Tl rises above the upper deadband and stay on until Th-Tl falls below the lower deadband. <br><br>Jeff / TESS</div><div id="AppleMailSignature"><br>Sent from my iPhone</div><div><br>On Feb 5, 2017, at 11:02 PM, ahmad abbasian via TRNSYS-users <<a href="mailto:trnsys-users@lists.onebuilding.org">trnsys-users@lists.onebuilding.org</a>> wrote:<br><br></div><blockquote type="cite"><div>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<div id="divtagdefaultwrapper" style="font-size:12pt;color:#000000;font-family:Calibri,Arial,Helvetica,sans-serif;" dir="ltr">
<p>Dear Ieen</p>
<p>I know than when the difference of Th and Tl is lower than "Lower dead band" controller sends a control signal. For example, in the following picture which is a differential controller, if the difference of Th and Tl is lower than 2 , the controller will
send the control signal to turn off pump. But when the difference is higher than 5 (Upper dead band dT) and also when the difference is lower than 5 , in both cases , the pump is on. So what is the Upper dead band dT ? </p>
<p><pastedImage.png> </p>
<p><br>
</p>
<div id="Signature">
<div id="divtagdefaultwrapper" dir="ltr" style="font-size:12pt; color:#000000; font-family:Calibri,Arial,Helvetica,sans-serif">
<div id="divtagdefaultwrapper" style="font-size:12pt; color:#000000; background-color:#ffffff; font-family:Calibri,Arial,Helvetica,sans-serif">
..............................................................................................</div>
<div id="divtagdefaultwrapper" style="font-size:12pt; color:#000000; background-color:#ffffff; font-family:Calibri,Arial,Helvetica,sans-serif">
Ahmad abbasianzadeh</div>
<div style="font-size:12pt; color:#000000; background-color:#ffffff; font-family:Calibri,Arial,Helvetica,sans-serif">
Solar energy Researcher</div>
<div style="font-size:12pt; color:#000000; background-color:#ffffff; font-family:Calibri,Arial,Helvetica,sans-serif">
<b>Harrisburg, Pensylvania</b></div>
<div style="font-size:12pt; color:#000000; background-color:#ffffff; font-family:Calibri,Arial,Helvetica,sans-serif">
<br>
</div>
<div style="font-size:12pt; color:#000000; background-color:#ffffff; font-family:Calibri,Arial,Helvetica,sans-serif">
<br>
</div>
<div style="font-size:12pt; color:#000000; background-color:#ffffff; font-family:Calibri,Arial,Helvetica,sans-serif">
</div>
</div>
</div>
</div>
<hr style="display:inline-block;width:98%" tabindex="-1">
<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> leen peeters <<a href="mailto:l.f.r.peeters@gmail.com">l.f.r.peeters@gmail.com</a>><br>
<b>Sent:</b> Sunday, February 5, 2017 9:18:21 AM<br>
<b>To:</b> ahmad abbasian; TRNSYS users mailing list at <a href="http://OneBuilding.org">OneBuilding.org</a><br>
<b>Subject:</b> Re: [TRNSYS-users] what is the upper dead band in controller ?</font>
<div> </div>
</div>
<div>
<div dir="ltr">
<div>
<div>Hi,<br>
<br>
</div>
can you rephrase your question. The answer is probably easier than getting the point of your higher lower than-part
<br>
<br>
</div>
leen<br>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On 5 February 2017 at 20:33, ahmad abbasian via TRNSYS-users
<span dir="ltr"><<a href="mailto:trnsys-users@lists.onebuilding.org" target="_blank">trnsys-users@lists.onebuilding.org</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">
<div id="m_-2931401621899611415divtagdefaultwrapper" style="font-size:12pt;color:#000000;font-family:Calibri,Arial,Helvetica,sans-serif" dir="ltr">
<p>Dear All</p>
<p>in a differential controller what is the upper dead band? I know that when the difference of Th and Tl is lower than "lower dead band temperature" the controller will actand , for example , the pump will be turned off. but for the difference higher lower
than "upper dead band" and also higher than it, the pump is turned on !</p>
<p><br>
</p>
<p>Thank you</p>
<p><br>
</p>
<div id="m_-2931401621899611415Signature">
<div id="m_-2931401621899611415divtagdefaultwrapper" dir="ltr" style="font-size:12pt;color:#000000;font-family:Calibri,Arial,Helvetica,sans-serif">
<div id="m_-2931401621899611415divtagdefaultwrapper" style="font-size:12pt;color:#000000;background-color:#ffffff;font-family:Calibri,Arial,Helvetica,sans-serif">
..............................<wbr>..............................<wbr>..............................<wbr>....</div>
<div id="m_-2931401621899611415divtagdefaultwrapper" style="font-size:12pt;color:#000000;background-color:#ffffff;font-family:Calibri,Arial,Helvetica,sans-serif">
Ahmad abbasianzadeh</div>
<div style="font-size:12pt;color:#000000;background-color:#ffffff;font-family:Calibri,Arial,Helvetica,sans-serif">
Solar energy Researcher</div>
<div style="font-size:12pt;color:#000000;background-color:#ffffff;font-family:Calibri,Arial,Helvetica,sans-serif">
Pensylvania</div>
<div style="font-size:12pt;color:#000000;background-color:#ffffff;font-family:Calibri,Arial,Helvetica,sans-serif">
<OutlookEmoji-x0yyutg5hv1.png.png></div>
<div style="font-size:12pt;color:#000000;background-color:#ffffff;font-family:Calibri,Arial,Helvetica,sans-serif">
</div>
</div>
</div>
</div>
</div>
<br>
______________________________<wbr>_________________<br>
TRNSYS-users mailing list<br>
<a href="mailto:TRNSYS-users@lists.onebuilding.org">TRNSYS-users@lists.<wbr>onebuilding.org</a><br>
<a href="http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org" rel="noreferrer" target="_blank">http://lists.onebuilding.org/<wbr>listinfo.cgi/trnsys-users-<wbr>onebuilding.org</a><br>
<br>
</blockquote>
</div>
<br>
</div>
</div>
</div></blockquote><blockquote type="cite"><div><span>_______________________________________________</span><br><span>TRNSYS-users mailing list</span><br><span><a href="mailto:TRNSYS-users@lists.onebuilding.org">TRNSYS-users@lists.onebuilding.org</a></span><br><span><a href="http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org">http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org</a></span><br></div></blockquote></body></html>