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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 Fred,<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'>From my experience, VRF controls have
usually just given the user 2 to 4 steps of fan speed (not infinitely variable)
but now that I look at one of the controls manuals (see Mitsubishi City-Multi below),
they have an “Auto” option as well. It doesn’t explain
how auto mode works but I know some fan-coil unit controls adjust the fan speed
based on how far the room temperature is from setpoint - perhaps this does the
same?<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'>Aaron<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'><img width=527 height=462 id="_x0000_i1026"
src="cid:image002.jpg@01CF6A20.8B531790"> <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>
<div>
<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 style='margin-left:27.0pt'><strong><b><font size=2
color=navy face=Calibri><span style='font-size:11.0pt;font-family:Calibri;
color:navy'>Aaron Smith, </span></font></b></strong><em><i><font color=gray
face=Calibri><span style='font-family:Calibri;color:gray'>P.Eng</span></font></i></em><em><i><font
color=navy face=Calibri><span style='font-family:Calibri;color:navy'> </span></font></i></em><font
size=3 color=navy face="Times New Roman"><span style='font-size:12.0pt;
font-family:"Times New Roman";color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:27.0pt'><i><font size=2 color=gray
face=Verdana><span style='font-size:10.0pt;font-family:Verdana;color:gray;
font-style:italic'>M&R Engineering</span></font></i><i><font size=1
color=gray face=Verdana><span style='font-size:9.0pt;font-family:Verdana;
color:gray;font-style:italic'> </span></font></i><o:p></o:p></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Porter, Fred AEC
[mailto:FPorter@archenergy.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, May 06, 2014 9:13
PM<br>
<b><span style='font-weight:bold'>To:</span></b> bldg-sim@lists. onebuilding.
org (bldg-sim@lists.onebuilding.org)<br>
<b><span style='font-weight:bold'>Subject:</span></b> [Bldg-sim] Fan modulation
for VRF fan coils</span></font><font size=3 face="Times New Roman"><span
style='font-size:12.0pt;font-family:"Times New Roman"'><o:p></o:p></span></font></p>
</div>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>Anyone,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>I
had been led to believe that the fans modulated on many VRF indoor units.
However, I am now being told by a rep that this is not the case for any larger
VRF fan coils, where it really would be valuable as the design W/cfm
isn’t minimal. Currently the designer does not want the fan coils
cycling, and wants to deliver OA to a mixing box, not separately to the space
in parallel as was our original recommendation. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>Does
anyone know a reputable source that contradicts what I’ve been told? <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>Fred<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><b><font size=2 color=black face=Calibri><span
style='font-size:11.0pt;color:black;font-weight:bold'>Fred Porter, BEMP, LEED</span></font><font
color="#1f497d"><span style='color:#1F497D'>©</span></font><font
color=black><span style='color:black'> AP<o:p></o:p></span></font></b></p>
<p class=MsoNormal style='margin-bottom:2.0pt'><font size=2 color="#7f7f7f"
face=Calibri><span style='font-size:11.0pt;color:#7F7F7F'>Senior Energy Analyst<o:p></o:p></span></font></p>
<p class=MsoNormal><b><font size=2 color="#005daa" face=Calibri><span
style='font-size:11.0pt;color:#005DAA;font-weight:bold'>Architectural Energy
Corporation<o:p></o:p></span></font></b></p>
<p class=MsoNormal><i><font size=1 color="#005daa" face=Calibri><span
style='font-size:9.0pt;color:#005DAA;font-style:italic'>A Member of NORESCO
Energy and Sustainability Services<o:p></o:p></span></font></i></p>
<p class=MsoNormal><st1:address w:st="on"><st1:Street w:st="on"><font size=2
color="#7f7f7f" face=Calibri><span style='font-size:10.0pt;color:#7F7F7F'>2540
Frontier Ave, Suite 100</span></font></st1:Street><font size=2 color="#7f7f7f"><span
style='font-size:10.0pt;color:#7F7F7F'>, <st1:City w:st="on">Boulder</st1:City>,
<st1:State w:st="on">CO</st1:State> <st1:PostalCode w:st="on">80301</st1:PostalCode></span></font></st1:address><font
size=2 color="#7f7f7f"><span style='font-size:10.0pt;color:#7F7F7F'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#7f7f7f" face=Calibri><span
style='font-size:10.0pt;color:#7F7F7F'>Phone 303.459.7425 | <a
href="mailto:fporter@archenergy.com">fporter@archenergy.com</a><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#807f83" face=Calibri><span
style='font-size:10.0pt;color:#807F83'><a href="http://www.archenergy.com">www.archenergy.com</a></span></font><font
size=1 color="#807f83"><span style='font-size:9.0pt;color:#807F83'><o:p></o:p></span></font></p>
<p class=MsoNormal><b><font size=1 color="#7f7f7f" face=Calibri><span
style='font-size:9.0pt;color:#7F7F7F;font-weight:bold'><o:p> </o:p></span></font></b></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
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