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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I think I found a bug with the ERV feature in eQuest related
to temperature control. My input is as follows:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> RECOVER-EXHAUST = YES<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> ERV-RECOVER-TYPE = ENTHALPY-WHEEL<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> ERV-SENSIBLE-EFF = 0.75<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> ERV-LATENT-EFF = 0.75<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> ERV-RUN-CTRL = OA-EXHAUST-DT<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> ERV-TEMP-CTRL = MIXED-AIR-RESET<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> ERV-CAP-CTRL = MODULATE-HX<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> ERV-HX-KW = 0.207<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> ERV-FANS = HVAC-SUPPLY/RETURN <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> ERV-OA-STATIC = 0.5<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> ERV-EXH-STATIC = 0.5<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> ERV-FROST-CTRL = USE-CAP-CTRL<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>The system shows heating savings as expected, and cooling
savings during summer periods, but during winter there is a large cooling
penalty. Hourly reports show an unexpected cooling load during winter
night mode operation. If I set ERV-OA-STATIC to zero, that cooling load
goes away.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>If I change to a fan located in the ERV, the unexpected
cooling load is still absent:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> ERV-FANS = SELF-CONTAINED<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> ERV-EXH-KW/FLOW = 0.002<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thus, it appears that the heat gain due to friction in the
heat wheel is not taken into account for the OA setpoint during night mode when
ERV-FANS = HVAC-SUPPLY/RETURN. Has anyone else seen this problem?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>The SELF-CONTAINED option appears to be a work-around, but
it is not as convenient for add-on heat wheels.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thanks,<o:p></o:p></span></font></p>
<p><st1:PersonName w:st="on"><font size=1 face=Arial><span style='font-size:
9.0pt;font-family:Arial'>Doug Maddox</span></font></st1:PersonName><font
size=1 face=Arial><span style='font-size:9.0pt;font-family:Arial'>, PE</span></font><o:p></o:p></p>
<p><font size=2 face="BankGothic Md BT"><span style='font-size:11.0pt;
font-family:"BankGothic Md BT"'>THE WEIDT GROUP</span></font><br>
<img width=32 height=40 id="_x0000_i1025"
src="cid:image001.gif@01C8E757.0568BBA0"> <br>
<font size=1 face=Arial><span style='font-size:9.0pt;font-family:Arial'><ns0:Street
w:insAuthor="DougM" w:insDate="2008-07-16T14:52:00Z" w:endInsAuthor="DougM"
w:endInsDate="2008-07-16T14:52:00Z"><ns0:address w:insAuthor="DougM"
w:insDate="2008-07-16T14:52:00Z" w:endInsAuthor="DougM"
w:endInsDate="2008-07-16T14:52:00Z"><st1:Street w:st="on"><st1:address w:st="on">5800
Baker Road</st1:address></st1:Street></ns0:address></ns0:Street></span></font><br>
<font size=1 face=Arial><span style='font-size:9.0pt;font-family:Arial'><ns0:place
w:insAuthor="DougM" w:insDate="2008-07-16T14:52:00Z" w:endInsAuthor="DougM"
w:endInsDate="2008-07-16T14:52:00Z"><ns0:City w:insAuthor="DougM"
w:insDate="2008-07-16T14:52:00Z" w:endInsAuthor="DougM"
w:endInsDate="2008-07-16T14:52:00Z"><st1:place w:st="on"><st1:City w:st="on">Minnetonka</st1:City></ns0:City></st1:place>,
<ns0:State w:insAuthor="DougM" w:insDate="2008-07-16T14:52:00Z"
w:endInsAuthor="DougM" w:endInsDate="2008-07-16T14:52:00Z"><st1:State w:st="on">MN</st1:State></ns0:State>
<ns0:PostalCode w:insAuthor="DougM" w:insDate="2008-07-16T14:52:00Z"
w:endInsAuthor="DougM" w:endInsDate="2008-07-16T14:52:00Z"><st1:PostalCode
w:st="on">55345</st1:PostalCode></ns0:PostalCode></ns0:place></span></font><br>
<font size=1 face=Arial><span style='font-size:9.0pt;font-family:Arial'>T
802-262-1033<br>
F 952.938.1480<br>
<a href="blocked::http://www.twgi.com/" title="blocked::http://www.twgi.com/">www.twgi.com</a><br>
<a href="blocked::mailto:DougM@twgi.com" title="blocked::mailto:DougM@twgi.com">DougM@twgi.com</a></span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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