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<font size="+1"><tt>We have had luck using a 25% solution of white
vinegar,</tt></font> pumping the solution into the system until
the pump cannot overcome the friction, capping the inlet(where the
pump was pumping), make sure the outlet is open, let the sun
superheat the solution and blow the obstruction out through the
outlet. (Just have to make sure that no one, nothing is in the way
of the outlet)<br>
Chris<br>
<div class="moz-cite-prefix">On 4/17/2015 2:05 PM, Glenn Burt wrote:<br>
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<p class="MsoNormal"><span style="color:#1F497D">When I was
installing them and using Tom Lane’s book, he recommended a
solution of TSP be used for cleaning lines prior to charging
with HTF. 1 cup per gallon of water is what I read. He
suggests running it for 30 min, then flushing with clean
water for another 30 before charging with HTF.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">-Glenn<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
RE-wrenches
[<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>On
Behalf Of </b>Kirk Herander<br>
<b>Sent:</b> Friday, April 17, 2015 1:21 PM<br>
<b>To:</b> RE-wrenches<br>
<b>Subject:</b> [RE-wrenches] flushing DHW collectors<o:p></o:p></span></p>
</div>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:14.0pt">Hello,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">I have an
older 10 collector system in which the glycol has stagnated
due to a defective collector sensor, apparently for some
time. I was able to drain the collectors, the cooked glycol
is black with a good bit of sediment. I tried to flush the
system with water but my ½ hp utility pump could not pump
the water entirely through the collectors. Suction slowed
down and stopped after just a few gallons, as if the pump
couldn’t overcome the effective head of the system. I had no
problem using this pump to charge the loop when it was
commissioned. I suspect the collectors may be gummed up with
cooked glycol. I guess compressed air is next to try. Are
there any safe chemicals to use to purge / un-gum the
collectors? Thanks. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:14.0pt">Kirk
Herander<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:14.0pt">VT Solar,
LLC <o:p></o:p></span></b></p>
<p class="MsoNormal"><b><i><span style="font-size:14.0pt">Proven
PV provider since 1991<o:p></o:p></span></i></b></p>
<p class="MsoNormal"><b><span style="font-size:14.0pt"><a
moz-do-not-send="true" href="www.vermontsolarnow.com">www.vermontsolarnow.com</a><o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:14.0pt">dba Vermont
Solar Engineering<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">NABCEP<sup>TM
</sup>Inaugural Certificant<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">VT RE
Incentive Program Partner<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">802.863.1202<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<pre class="moz-signature" cols="72">--
Christopher Warfel, President
ENTECH Engineering, Inc.
PO Box 871, Block Island, RI 02807
401-466-8978</pre>
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