Varkie,<div><br></div><div>Your leaving supply air temperature off the coil must be 6 degress higher than your chilled water supply temperature.  If your unit fan is in the draw through configuration, the leaving temperature off of your coil will need to be your design supply air temperature minus the fan motor heat gain.</div>
<div><br></div><div>For example, if you have a leaving air temperature of 55 deg F out of the unit and a fan motor heat gain of 3 deg F, then in a draw through configuration, your leaving coil temperature would be 52 deg F which means a maximum chilled water supply temperature of 46 deg F.  If you switched the fan to blow through, then the maximum chilled water supply temperature would be 49 deg F.</div>
<div><br></div><div>Does that answer your question?</div><div><br></div><div>-Robby<br><br><div class="gmail_quote">On Thu, Dec 15, 2011 at 1:27 PM, Varkie C Thomas <span dir="ltr"><<a href="mailto:thomasv@iit.edu">thomasv@iit.edu</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div><p>What causes the error below? The CHW input used all eQUEST defaults.  The bldg is high-rise residential. The systems used defaults also (4-pipe FCU). Varkie Thomas</p>
<p style="MARGIN:0in 0in 0pt"><span style="FONT-FAMILY:'Courier New';FONT-SIZE:8pt">pro Maslak sim<span>                                                                  </span>DOE-2.2-47h2<span>  </span>12/15/2011<span>    </span>15:03:51<span>  </span>BDL RUN<span>  </span>7<u></u><u></u><u></u></span></p>

<p style="MARGIN:0in 0in 0pt"><span style="FONT-FAMILY:'Courier New';FONT-SIZE:8pt"><span>                                                                                                                        </span><u></u><u></u></span></p>

<p style="MARGIN:0in 0in 0pt"><span style="FONT-FAMILY:'Courier New';FONT-SIZE:8pt">REPORT- ATTN Simulation Messages For Review HVAC<span>        </span>Program<span>                             </span>WEATHER FILE- EPW ISTANBUL,-,TUR<span>  </span><u></u><u></u></span></p>

<p style="MARGIN:0in 0in 0pt"><span style="FONT-FAMILY:'Courier New';FONT-SIZE:8pt">---------------------------------------------------------------------------------------------------------------------------------<u></u><u></u></span></p>

<p style="MARGIN:0in 0in 0pt"><span style="FONT-FAMILY:'Courier New';FONT-SIZE:8pt"><u></u> <u></u></span></p>
<p style="MARGIN:0in 0in 0pt"><span style="FONT-FAMILY:'Courier New';FONT-SIZE:8pt"><u></u> <u></u></span></p>
<p style="MARGIN:0in 0in 0pt"><span style="FONT-FAMILY:'Courier New';FONT-SIZE:8pt"><span> </span>***ERROR***********************************************************************<u></u><u></u></span></p>
<p style="MARGIN:0in 0in 0pt"><span style="FONT-FAMILY:'Courier New';FONT-SIZE:8pt"><span>             </span>In EL1 Sys1 (FC)<span>                   </span>, cooling coil leaving temperature must<u></u><u></u></span></p>

<p style="MARGIN:0in 0in 0pt"><span style="FONT-FAMILY:'Courier New';FONT-SIZE:8pt"><span>             </span>be at least 6F higher than entering water temp.<u></u><u></u></span></p>
<p style="MARGIN:0in 0in 0pt"><span style="FONT-FAMILY:'Courier New';FONT-SIZE:8pt"><u></u> <u></u></span></p>
<p style="MARGIN:0in 0in 0pt"><span style="FONT-FAMILY:'Courier New';FONT-SIZE:8pt"><span> </span>***ERROR***********************************************************************<u></u><u></u></span></p>
<p style="MARGIN:0in 0in 0pt"><span style="FONT-FAMILY:'Courier New';FONT-SIZE:8pt"><span>             </span>In EL1 Sys1 (FC)<span>                   </span>, cooling coil leaving temperature must<u></u><u></u></span></p>

<p style="MARGIN:0in 0in 0pt"><span style="FONT-FAMILY:'Courier New';FONT-SIZE:8pt"><span>             </span>be at least 6F higher than entering water temp.<u></u><u></u></span></p>
<p style="MARGIN:0in 0in 0pt"><span style="FONT-FAMILY:'Courier New';FONT-SIZE:8pt"><u></u> <u></u></span></p>
<p style="MARGIN:0in 0in 0pt"><span style="FONT-FAMILY:'Courier New';FONT-SIZE:8pt"><span> </span>***ERROR***********************************************************************<u></u><u></u></span></p>
<p style="MARGIN:0in 0in 0pt"><span style="FONT-FAMILY:'Courier New';FONT-SIZE:8pt"><span>             </span>In EL1 Sys1 (FC)<span>                   </span>, cooling coil leaving temperature must<u></u><u></u></span></p>

<p style="MARGIN:0in 0in 0pt"><span style="FONT-FAMILY:'Courier New';FONT-SIZE:8pt"><span>             </span>be at least 6F higher than entering water temp.<u></u><u></u></span></p>
<p style="MARGIN:0in 0in 0pt"><span style="FONT-FAMILY:'Courier New';FONT-SIZE:8pt"><u></u> <u></u></span></p>
<p style="MARGIN:0in 0in 0pt"><span style="FONT-FAMILY:'Courier New';FONT-SIZE:8pt"><span> </span>***ERROR***********************************************************************<u></u><u></u></span></p>
<p style="MARGIN:0in 0in 0pt"><span style="FONT-FAMILY:'Courier New';FONT-SIZE:8pt"><u></u> <u></u></span></p>
<p style="MARGIN:0in 0in 10pt" class="MsoNormal"><u></u><font face="Calibri"> </font><u></u></p>
<p><br><br><br><br> </p></div>
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