[RE-wrenches] Apricus SHW Charging

[Dana]

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 - dana at solarwork.com
V - 970.626.5253
F - 970.626.4140
C - 970.209.4076


-----Original Message-----
From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Carl Adams
Sent: Wednesday, October 29, 2008 9:21 PM
To: re-wrenches at 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 at 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