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<DIV dir=ltr align=left><SPAN class=580561218-24092008><FONT face=Arial
color=#0000ff size=2>I believe a cycling type of fan shuts off when the space
temperature falls below the Throttling Range you assign for the particular mode
(Heating or Cooling) you are in. For example, a cooling thermostat of 72°F and a
throttling range of 4°F yields a high limit of 74°F and a low limit of
70°F. When you fall within this range, I believe the fan should shut off
(if you choose the Fan Intermittent mode).There should be no
airflow.</FONT></SPAN></DIV>
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<DIV dir=ltr align=left><SPAN class=580561218-24092008><FONT face=Arial
color=#0000ff size=2>But now I am unsure if ALL SYSTEMS allow fan cycling..I
believe you can with a fan coil.</FONT></SPAN></DIV>
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<DIV dir=ltr align=left><SPAN class=580561218-24092008><FONT face=Arial
color=#0000ff size=2>The other responder is correct in that eQuest deals in
hourly chunks, and a fan may only be on part of an hour, thus a lower CFM, but
in reality, the same CFM for only part of the hour.</FONT></SPAN></DIV>
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<DIV align=left><FONT color=#0000ff>John R. Aulbach, PE, CEM</FONT></DIV>
<DIV align=left><FONT face=Arial size=2><EM>Project Manager</EM></FONT></DIV>
<DIV align=left><FONT face=Arial size=2><FONT color=#0000ff>Nexant,
Inc</FONT>.</FONT></DIV>
<DIV align=left><FONT face=Arial size=2>701 West Kimberly Ave., Suite
245</FONT></DIV>
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USA</FONT></DIV>
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<FONT face=Tahoma size=2><B>From:</B> bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <B>On Behalf Of </B>Yuvaraj
Saravanan<BR><B>Sent:</B> Wednesday, September 24, 2008 10:57 AM<BR><B>To:</B>
equest-users-bounces@lists.onebuilding.org;
bldg-sim@lists.onebuilding.org<BR><B>Subject:</B> [Bldg-sim] eQuest - FCU - how
to make it cycle<BR></FONT><BR></DIV>
<DIV></DIV><!-- Converted from text/rtf format -->
<P><FONT face=Arial size=2>Hi All,</FONT> <BR><FONT face=Arial size=2>Does
anyone know how to make a FCU cycle ON/OFF based on the zone thermostat setting?
I tried choosing the "Fan on mode" to be intermittent in the Fan->Flow
parameters tab. When I make the fan to be intermittent, fan is cycling but the
supply CFM is no more a constant volume. It is varying the supply CFM. I
observed this in the hourly report.</FONT></P>
<P><FONT face=Arial size=2>ASHRAE standard 90.1 requires the fan to cycle to
meet the loads during unoccupied hours. How everybody model this in eQuest when
you have a FCU system?</FONT></P>
<P><FONT face=Arial size=2>Any suggestions is greatly appreciated.</FONT> </P>
<P><FONT face=Arial size=2>Regards,</FONT> <BR><FONT face=Arial
size=2>Yuvaraj</FONT> <BR><FONT face=Arial size=2>_</FONT><FONT face=Arial
color=#000000 size=2>_____________________________________________</FONT>
<BR><FONT face=Arial color=#000000 size=2>Yuvaraj Saravanan, PE</FONT> <BR><FONT
face=Arial color=#000000 size=2>Engineer</FONT> </P>
<P><FONT face=Arial color=#000000 size=2>Arup </FONT><BR><FONT face=Arial
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size=1>yuvaraj.saravanan@arup.com</FONT><BR><A
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