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<TITLE>OA damper barely modulating</TITLE>
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<P DIR=LTR><SPAN LANG="en-us"><FONT FACE="Calibri">Hi all,</FONT></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"><FONT FACE="Calibri">I had similar OA damper question last</FONT></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">week which</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> the</FONT></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">OA</FONT></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">damper was</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> stuck open with 100% OA</FONT></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">(which was resolved thanks to the board</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">!</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">)</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> I have a new issue</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">…</FONT></SPAN><SPAN LANG="en-us"></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"><FONT FACE="Calibri">The</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> system</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> is a</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">: boiler</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> + chiller + VAV</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> with HW reheat and air-side</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"></FONT></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">economizer</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">.</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"></FONT></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri"> The problem is</FONT></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">the OA damper is open</FONT></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">about</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> the same %</FONT></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">(about .45</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> which is equal to the</FONT></SPAN><SPAN LANG="en-us"><B><I> <FONT FACE="Calibri">min</FONT></I></B></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> dsn OA CFM</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">)</FONT></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">whenever the air-side system is operating</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> in</FONT></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">my hourly</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> reports</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> all year</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">.</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> I am thinking that this should open up close to 100% at least some times of the year</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> and close</FONT></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">back down</FONT></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">to min OA</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> during unoccupied modes, etc</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">. The</FONT></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">as-designed system is capable of it</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> I am just don</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">’</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">t think my model is set up to work that way</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">.</FONT></SPAN><SPAN LANG="en-us"></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"><FONT FACE="Calibri">I am thinking</FONT></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">with</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> this as-designed system, I have gotten over zealous with modifying defaults and have</FONT></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">not entered or incorrectly entered some values on cooling/heating controls,</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> OA,</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> economizer, or a combination</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> of a few things</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">. I have manipulated all of these things trying to figure this out but without luck.</FONT></SPAN><SPAN LANG="en-us"></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"><FONT FACE="Calibri">Could someone please take a quick look at the model attached and let me know if they see anything sus</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">pect? Your input and help is greatly appreciated! Thanks,</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> </FONT></SPAN><SPAN LANG="en-us"> </SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">-Patrick</FONT></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT FACE="Arial" SIZE=2 COLOR="#000000"> <<Retail1.inp>> </FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT FACE="Arial" SIZE=2 COLOR="#000000"> <<Retail1.pd2>> </FONT></SPAN><SPAN LANG="en-us"></SPAN></P>
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