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<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>
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Ahmad abbasianzadeh</div>
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Solar energy Researcher</div>
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<b>Harrisburg, Pensylvania</b></div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> leen peeters <l.f.r.peeters@gmail.com><br>
<b>Sent:</b> Sunday, February 5, 2017 9:18:21 AM<br>
<b>To:</b> ahmad abbasian; TRNSYS users mailing list at OneBuilding.org<br>
<b>Subject:</b> Re: [TRNSYS-users] what is the upper dead band in controller ?</font>
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<div>Hi,<br>
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can you rephrase your question. The answer is probably easier than getting the point of your higher lower than-part
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leen<br>
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<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>
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<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>
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<p>Thank you</p>
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Ahmad abbasianzadeh</div>
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Solar energy Researcher</div>
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Pensylvania</div>
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