<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman, new york, times, serif;font-size:12pt"><DIV>Mark:</DIV>
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<DIV>Either spread your thermostat throttling range, or incrase your total supply airflow.</DIV>
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<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><A name=_MailAutoSig><SPAN style="COLOR: #1f497d; mso-fareast-font-family: 'Times New Roman'; mso-fareast-theme-font: minor-fareast; mso-no-proof: yes"><FONT face=Calibri>John R. Aulbach, PE, CEM<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></FONT></SPAN></A></P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN style="mso-bookmark: _MailAutoSig"><SPAN style="COLOR: #1f497d; mso-fareast-font-family: 'Times New Roman'; mso-fareast-theme-font: minor-fareast; mso-no-proof: yes"><FONT face=Calibri>Senior Energy Engineer<o:p></o:p></FONT></SPAN></SPAN></P>
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<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN style="mso-bookmark: _MailAutoSig"><SPAN style="COLOR: #1f497d; mso-fareast-font-family: 'Times New Roman'; mso-fareast-theme-font: minor-fareast; mso-no-proof: yes"><FONT face=Calibri>1990 E. Grand Avenue, El Segundo, CA 90245<BR>W: 888-826-1216, X254| D: 310-765-7295 | F: 310-817-2745<o:p></o:p></FONT></SPAN></SPAN></P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN style="mso-bookmark: _MailAutoSig"></SPAN><A href="http://www.ptrenergy.com/"><FONT face=Calibri><SPAN style="mso-bookmark: _MailAutoSig"><SPAN style="mso-fareast-font-family: 'Times New Roman'; mso-fareast-theme-font: minor-fareast; mso-no-proof: yes">www.ptrenergy.com</SPAN></SPAN><SPAN style="mso-bookmark: _MailAutoSig"></SPAN></FONT></A><SPAN style="mso-bookmark: _MailAutoSig"><SPAN style="COLOR: #1f497d; mso-fareast-font-family: 'Times New Roman'; mso-fareast-theme-font: minor-fareast; mso-no-proof: yes"><FONT face=Calibri> </FONT></SPAN></SPAN><A href="mailto:%7C%20jaulbach@ptrenergy.com"><FONT face=Calibri><SPAN style="mso-bookmark: _MailAutoSig"><SPAN style="mso-fareast-font-family: 'Times New Roman'; mso-fareast-theme-font: minor-fareast; mso-no-proof: yes">| jaulbach@ptrenergy.com</SPAN></SPAN><SPAN style="mso-bookmark: _MailAutoSig"></SPAN></FONT></A><SPAN style="mso-bookmark:
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<B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> Mark Darrall <MDarrall@a2so4.com><BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> equest-users <equest-users@lists.onebuilding.org><BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Mon, May 2, 2011 6:21:24 AM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> [Equest-users] Fixing unmet hours / outside of throttling range warnings<BR></FONT><BR>
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<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Univers LT 55'; FONT-SIZE: 9pt">Good Morning, eQUESTers,</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Univers LT 55'; FONT-SIZE: 9pt"> </SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Univers LT 55'; FONT-SIZE: 9pt">I’m working on my design case model. Here’s my ATTN report:</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Univers LT 55'; FONT-SIZE: 9pt"> </SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Univers LT 55'; FONT-SIZE: 9pt">**WARNING**********************************************************************</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Univers LT 55'; FONT-SIZE: 9pt"> SYSTEM EL1 Sys1 (PSZ) (G.NNW1) may have inadequate cooling capability</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Univers LT 55'; FONT-SIZE: 9pt"> Check COOLING-CAPACITY and MIN-SUPPLY-T for consistency</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Univers LT 55'; FONT-SIZE: 9pt"> </SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Univers LT 55'; FONT-SIZE: 9pt">**WARNING**********************************************************************</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Univers LT 55'; FONT-SIZE: 9pt"> SYSTEM EL1 Sys2 (PSZ) (G.WSW2) may have inadequate cooling capability</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Univers LT 55'; FONT-SIZE: 9pt"> Check COOLING-CAPACITY and MIN-SUPPLY-T for consistency</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Univers LT 55'; FONT-SIZE: 9pt"> </SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Univers LT 55'; FONT-SIZE: 9pt">**WARNING**********************************************************************</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Univers LT 55'; FONT-SIZE: 9pt"> SYSTEM EL1 Sys3 (PSZ) (G.N3) may have inadequate cooling capability</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Univers LT 55'; FONT-SIZE: 9pt"> Check COOLING-CAPACITY and MIN-SUPPLY-T for consistency</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Univers LT 55'; FONT-SIZE: 9pt"> </SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Univers LT 55'; FONT-SIZE: 9pt">**WARNING**********************************************************************</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Univers LT 55'; FONT-SIZE: 9pt"> SYSTEM EL1 Sys4 (PSZ) (G.S4) may have inadequate cooling capability</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Univers LT 55'; FONT-SIZE: 9pt"> Check COOLING-CAPACITY and MIN-SUPPLY-T for consistency</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Univers LT 55'; FONT-SIZE: 9pt"> </SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Univers LT 55'; FONT-SIZE: 9pt">**WARNING**********************************************************************</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Univers LT 55'; FONT-SIZE: 9pt"> SYSTEM EL1 Sys5 (PSZ) (G.N5) may have inadequate cooling capability</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Univers LT 55'; FONT-SIZE: 9pt"> Check COOLING-CAPACITY and MIN-SUPPLY-T for consistency</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Univers LT 55'; FONT-SIZE: 9pt"> </SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Univers LT 55'; FONT-SIZE: 9pt">**WARNING**********************************************************************</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Univers LT 55'; FONT-SIZE: 9pt"> SYSTEM EL1 Sys6 (PSZ) (G.E6) may have inadequate cooling capability</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Univers LT 55'; FONT-SIZE: 9pt"> Check COOLING-CAPACITY and MIN-SUPPLY-T for consistency</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Univers LT 55'; FONT-SIZE: 9pt"> </SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Univers LT 55'; FONT-SIZE: 9pt">**WARNING**********************************************************************</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Univers LT 55'; FONT-SIZE: 9pt"> SYSTEM EL1 Sys7 (PSZ) (G.C7) has zero outside air for design calculations</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Univers LT 55'; FONT-SIZE: 9pt"> </SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Univers LT 55'; FONT-SIZE: 9pt"> </SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Univers LT 55'; FONT-SIZE: 9pt">This last one I can answer as this system is a R/A only computer room cooler. For the others:</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Univers LT 55'; FONT-SIZE: 9pt"> </SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Univers LT 55'; FONT-SIZE: 9pt">COOLING-CAPACITY comes directly from the HVAC designer and is the capacity of the installed units. I’ve tried adjusting MIN-SUPPLY-T from 55 to 50 (and this seems to jive with information the coil manufacturer provides) to get a larger delta-T and it only seemed to make things worse somehow. Minimum OSA is 20%, but again, this is a design condition. These units do have enthalpy-controlled economizers.</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Univers LT 55'; FONT-SIZE: 9pt"> </SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Univers LT 55'; FONT-SIZE: 9pt">I’m also getting WAY too many hours outside of throttling range – 15%. My baseline model only has a 3%. I’m way out of whack with Appendix G requirements.</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Univers LT 55'; FONT-SIZE: 9pt"> </SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Univers LT 55'; FONT-SIZE: 9pt">Any suggestions as to settings to modify to clear these? Thank you!</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Univers LT 55'; FONT-SIZE: 9pt"> </SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Univers LT 45 Light'; COLOR: #333333; FONT-SIZE: 8pt">MARK DARRALL, AIA, LEED AP BD+C, NCARB<BR>Senior Project Manager</SPAN></P>
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