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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Hi All,<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>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.<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Am I missing something?<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Thanks for your help.<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>

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<p class=MsoNormal><strong><b><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>Jeffrey G Ross-Bain, PE,
LEED, BEMP</span></font></b></strong><font color=navy><span style='color:navy'><o:p></o:p></span></font></p>

<p class=MsoNormal><st1:place w:st="on"><st1:PlaceName w:st="on"><font size=1
  color=navy face=Arial><span style='font-size:7.5pt;font-family:Arial;
  color:navy'>Ross-Bain</span></font></st1:PlaceName><font size=1 color=navy
 face=Arial><span style='font-size:7.5pt;font-family:Arial;color:navy'> <st1:PlaceName
 w:st="on">Green</st1:PlaceName> <st1:PlaceType w:st="on">Building</st1:PlaceType></span></font></st1:place><font
size=1 color=navy face=Arial><span style='font-size:7.5pt;font-family:Arial;
color:navy'>, LLC</span></font><font color=navy><span style='color:navy'><o:p></o:p></span></font></p>

<p class=MsoNormal><font size=1 color=navy face=Arial><span style='font-size:
7.5pt;font-family:Arial;color:navy'>404-228-2893</span></font><font color=navy><span
style='color:navy'><o:p></o:p></span></font></p>

<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'> <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=5 color=green face=Webdings><span lang=EN-GB
style='font-size:18.0pt;font-family:Webdings;color:green'>P</span></font><font
color=black><span lang=EN-GB style='color:black'> </span></font><font size=2
color=green face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:
Arial;color:green'>Build Green...Save Time</span></font><font color=navy><span
style='color:navy'><o:p></o:p></span></font></p>

<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'> <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'> </span></font><o:p></o:p></p>

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