<html><head><style type='text/css'>p { margin: 0; }</style><style type='text/css'>body { font-family: 'Times New Roman'; font-size: 12pt; color: #000000}</style></head><body><P>We have used a big transfer pump (from Lowes) that gives us the pressure... but I'm wondering if this big pump is causing cavitation created bubbles leading to air in the system? with our old, lower head pump (an AC powered shurflow diaphram) we never had these mystery air pockets.</P>
<P> </P>
<P>way over my head in hot water... but Carl's question led to me posting this question on "too big of a pump".<BR><BR></P>
<DIV>For a brighter energy future,<BR><BR>Geoff Greenfield<BR>Founder and CEO<BR><FONT size=4><STRONG>Third Sun Solar & Wind Power Ltd.<BR></STRONG></FONT>340 West State Street, Unit 25<BR>Athens, OH 45701<BR><BR>740.597.3111 Fax 740.597.1548<BR>www.Third-Sun.com<BR><BR><EM><FONT size=4>Clean Energy - Expertly Installed<BR></FONT></EM><BR><BR><BR><BR></DIV><BR><BR>----- "Ken Schaal" <KEN@COMMONWEALTHSOLAR.COM>wrote: <BR>> Carl<BR>> Not sure about the high pressure ,as I use flat plates, but I would assume <BR>> it is because of the extremely high stagnation temps. What does the <BR>> manufacturer say?<BR>> As for charge pump, you could use a progressive cavity, ' carbonator pump'.<BR>> Contact off list for more info-------<BR>> ----- Original Message ----- <BR>> From: "Carl Adams" <swingjunkie@gmail.com><BR>> To: <re-wrenches@lists.re-wrenches.org><BR>> Sent: Wednesday, October 29, 2008 11:20 PM<BR>> Subject: [RE-wrenches] Apricus SHW Charging<BR>> >I am reviewing the commissioning instructions for the Apricus solar<BR>> > DHW system. I note that the specified charging pressure for the<BR>> > glycol loop is 72.5 psi per the manual. This seems high compared to<BR>> > other systems I have experience with. Can anyone comment on<BR>> > 1) The science behind the high system charging pressure and<BR>> > 2) an off the shelf pump you use to achieve these pressures<BR>> ><BR>> > With Regards<BR>> > Carl Adams<BR>> > NABCEP Certified Solar PV Installer<BR>> > NABCEP Certified Solar Thermal Installer<BR>> > SunRock Solar<BR>> > Cincinnati, Ohio<BR>> > www.sunrocksolar.com<BR>> > _______________________________________________<BR>> > List sponsored by Home Power magazine<BR>> ><BR>> > List Address: RE-wrenches@lists.re-wrenches.org<BR>> ><BR>> > Options & settings:<BR>> > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org<BR>> ><BR>> > List-Archive: <BR>> > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org<BR>> ><BR>> > List rules & etiquette:<BR>> > www.re-wrenches.org/etiquette.htm<BR>> ><BR>> > Check out participant bios:<BR>> > www.members.re-wrenches.org<BR>> > <BR>> _______________________________________________<BR>> List sponsored by Home Power magazine<BR>> List Address: RE-wrenches@lists.re-wrenches.org<BR>> Options & settings:<BR>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org<BR>> List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org<BR>> List rules & etiquette:<BR>> www.re-wrenches.org/etiquette.htm<BR>> Check out participant bios:<BR>> www.members.re-wrenches.org</body></html>