Carl, I install APRICUS evacuated collectors too:
Guess I missed that in the manual about the 72.5 PSI [.5 PSI? right], still looking for it. I set my system pressure to 20 PSI @ cold [no tubes in the collector] plus [elevation compensation ] of + 1 psi per 2.3 ft of head, and typically use a 50 psi PRV. So, basically 22 PSI for collectors on a single story roof and 30 PSI for a two story installation. I set the expansion tank bladder pre-charge to the 20 PSI plus head adjustment pressure too. No call backs on this pressure combination for me. Best solar hot water collector I have installed to date. I enjoy the 190+ deg. F solar heated water in my tank. I do not feel guilty about that long shower at the end of the day. I sent a copy of this to my supplier for their input and will report back on their advise. Stay in Hot water All! Dana Orzel Great Solar Works, Inc www.solarwork.com E - [EMAIL PROTECTED] V - 970.626.5253 F - 970.626.4140 C - 970.209.4076 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Carl Adams Sent: Wednesday, October 29, 2008 9:21 PM To: re-wrenches@lists.re-wrenches.org Subject: [RE-wrenches] Apricus SHW Charging I am reviewing the commissioning instructions for the Apricus solar DHW system. I note that the specified charging pressure for the glycol loop is 72.5 psi per the manual. This seems high compared to other systems I have experience with. Can anyone comment on 1) The science behind the high system charging pressure and 2) an off the shelf pump you use to achieve these pressures With Regards Carl Adams NABCEP Certified Solar PV Installer NABCEP Certified Solar Thermal Installer SunRock Solar Cincinnati, Ohio www.sunrocksolar.com _______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org _______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
