<div>Jeff,</div>
<div> </div>
<div>if you have chilled water coils through your unit MZ unit and the chilled water is coming from a chiller, then the water size economizing function comes from the cooling tower that is connected to the chiller which supplies the chilled water coils. If you are talking about economizer --in general terms, then maybe you are trying to air-economize which should be able to be input in the air-side tab-cooling for your MZ AHU.</div>
<div> </div>
<div>Look at the plant & cooling tower for your water econo inputs.</div>
<div> </div>
<div>Pasha<br><br></div>
<div class="gmail_quote">On Thu, Apr 15, 2010 at 1:40 PM, Jeff Ross-Bain <span dir="ltr"><<a href="mailto:jross-bain@rbgreenbuilding.com">jross-bain@rbgreenbuilding.com</a>></span> wrote:<br>
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<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt">Hi All,</span></font></p>
<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt"> </span></font></p>
<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt">I have an existing building with a multi-zone air handling system with chilled water and hot water coils. The system consists of the air handling units, a centrifugal chiller, cooling tower, and gas fired boiler. I am trying to introduce a water-side economizer into the system. In the detailed mode, I notice that a water-side economizer is not allowed with a multi-zone system. The spreadsheet input simply has an inaccessible “n/a” shown for the economizer and does not allow access.</span></font></p>
<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt"> </span></font></p>
<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt">Am I missing something?</span></font></p>
<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt"> </span></font></p>
<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt">Thanks for your help.</span></font></p>
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<p class="MsoNormal"><strong><b><font color="navy" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt">Jeffrey G Ross-Bain, PE, LEED, BEMP</span></font></b></strong><font color="navy"><span style="COLOR: navy"></span></font></p>
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