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Mark,<br>
Your message gave me pause, as I just last week specified this setup,
so I checked into it with our Grundfos rep. He said he had never heard
anything recommending against the flex in a pressure system. He said
the SQF doesn't know the difference between 40 psi and 100' of head. At
the end of the day the pump just stops. <br>
<br>
He did make a point of emphasizing the need for pressure relief valves,
as the helical rotor models can overpressure a system.<br>
<br>
Could you check with your distributor about this and post the reason
you're given, please?<br>
Allan<br>
<br>
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<p class="MsoNormal" style=""><span class="il"><b style="">Allan</b></span><b
style=""> Sindelar</b><span style="font-size: 10pt;"><br>
<a href="mailto:Allan@positiveenergysolar.com" target="_blank"><span
class="il">Allan</span>@positiveenergysolar.com</a><br>
NABCEP Certified Photovoltaic Installer<br>
EE98J Journeyman Electrician<br>
<b style="">Positive Energy, Inc.</b><br>
3201 Calle Marie<br>
Santa Fe, New Mexico 87507<br>
<b style="">505 424-1112</b><br>
<a href="http://www.positiveenergysolar.com/" target="_blank">www.positiveenergysolar.com</a></span></p>
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<br>
<br>
Mark Dickson wrote:
<blockquote cite="mid:0D07C31A581B4D7EBAE014031E05AE6A@OasisMontanaM"
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<div class="Section1">
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;">Our Grundfos
pump distributor has always
warned against using the SQF pumps in pressure pumping situations. I
can’t
quite remember why, but you may want to check into that. The Lorentz
HR’s
have been the choice in these situations.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;"><o:p> </o:p></span></font></p>
<div>
<p class="MsoAutoSig"><font color="navy" face="Comic Sans MS" size="2"><span
style="font-size: 10pt; font-family: "Comic Sans MS"; color: navy;">Best
regards,<o:p></o:p></span></font></p>
<p class="MsoAutoSig"><font color="navy" face="Comic Sans MS" size="2"><span
style="font-size: 10pt; font-family: "Comic Sans MS"; color: navy;"><o:p> </o:p></span></font></p>
<p class="MsoAutoSig"><font color="navy" face="Comic Sans MS" size="2"><span
style="font-size: 10pt; font-family: "Comic Sans MS"; color: navy;">Mark
</span></font><font color="navy" face="Comic Sans MS" size="2"><span
style="font-size: 10pt; font-family: "Comic Sans MS"; color: navy;">Dickson,</span></font><font
color="navy"><span style="color: navy;"><o:p></o:p></span></font></p>
<p class="MsoAutoSig"><font color="navy" face="ArialMT" size="2"><span
style="font-size: 10pt; font-family: ArialMT; color: navy;">NABCEP
Certified Solar
PV Installer ™<o:p></o:p></span></font></p>
<p class="MsoAutoSig"><font color="navy" face="Comic Sans MS" size="2"><span
style="font-size: 10pt; font-family: "Comic Sans MS"; color: navy;">Oasis
Montana
Inc.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Times New Roman"
size="3"><span style="font-size: 12pt; color: navy;"> <o:p></o:p></span></font></p>
</div>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;"><o:p> </o:p></span></font></p>
<div>
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<p class="MsoNormal"><b><font color="black" face="Tahoma" size="2"><span
style="font-size: 10pt; font-family: Tahoma; color: windowtext; font-weight: bold;">From:</span></font></b><font
color="black" face="Tahoma" size="2"><span
style="font-size: 10pt; font-family: Tahoma; color: windowtext;">
<a class="moz-txt-link-abbreviated" href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a>
[<a class="moz-txt-link-freetext" href="mailto:re-wrenches-bounces@lists.re-wrenches.org">mailto:re-wrenches-bounces@lists.re-wrenches.org</a>] <b><span
style="font-weight: bold;">On Behalf Of </span></b>Kent Osterberg<br>
<b><span style="font-weight: bold;">Sent:</span></b> Thursday, May
20, 2010 5:18
PM<br>
<b><span style="font-weight: bold;">To:</span></b> RE-wrenches<br>
<b><span style="font-weight: bold;">Subject:</span></b> Re:
[RE-wrenches]
Grundfos SQ FLEX AC/DC auto switching</span></font><font color="black"><span
style="color: windowtext;"><o:p></o:p></span></font></p>
</div>
<p class="MsoNormal"><font color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt;">Kirpal,<br>
<br>
None of the SQFlex equipment is UL listed. You may find that your AHJ
won't approve any of the SQFlex controls and possibly not even the pump.<br>
<br>
Kent Osterberg<br>
Blue Mountain Solar<br>
<br>
<br>
Kirpal Khalsa wrote: <o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt;">Hi Folks.....I am working on
putting together a
domestic water pumping system using a grundfos 11 - SQF - 2. This
system
will be connected to a standard pressure tank and cistern and have a
solar
array providing primary power. However at night and on cloudy days we
would like the system to switch back over to AC power from the grid. I
know that the grundfos IO 101 switch box allows the pump to use an AC
source
and when the AC source is removed it<u> automatically</u> switches back
to DC.
What I am looking for is when the DC source (solar) is not available
it <u>automatically</u>
switches over to AC power (grid) ( the reverse of what the IO 101
switch does)
and when the DC becomes available again it again <u>automatically</u>
switches back to the DC power (solar). <o:p></o:p></span></font></p>
<div>
<p class="MsoNormal"><font color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt;">Has anyone done this? Any
recommendations for
configuring this set up. We are looking to provide solar water pumping
during the day both when grid is present and when their is a power
outage and
AC pumping at night or cloudy weather all without battery back up.<o:p></o:p></span></font></p>
</div>
<div>
<p class="MsoNormal"><font color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt;">Thanks in advance for any
advice.!<o:p></o:p></span></font></p>
</div>
<div>
<p class="MsoNormal"><font color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt;">-- <br>
Sunny Regards,<br>
Kirpal Khalsa<br>
NABCEP Certified Solar PV Installer<br>
Renewable Energy Systems<br>
<a href="http://www.oregonsolarworks.com" moz-do-not-send="true">www.oregonsolarworks.com</a><br>
541-218-0201 m<br>
541-592-3958 o<o:p></o:p></span></font></p>
</div>
<pre wrap=""><font color="black" face="Courier New" size="2"><span
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