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<DIV><SPAN class=140301113-20052010><FONT color=#0000ff size=2 face=Arial>Good
point. I use a "mixing valve" to prevent overtemp water (165*+) from flowing
into my propane hot water heater/storage tank, this prevents the overtemp
safety plug from going.
<DIV><SPAN class=140301113-20052010><FONT color=#0000ff size=2
face=Arial></FONT></SPAN> </DIV>& then a "Anti scald" valve to
condition my water to 110* on the outboard side of the propane
hot water heater/storage tank.</FONT></SPAN></DIV>
<DIV><SPAN class=140301113-20052010><FONT color=#0000ff size=2
face=Arial></FONT></SPAN> </DIV>
<BLOCKQUOTE style="MARGIN-RIGHT: 0px" dir=ltr>
<DIV></DIV>
<DIV dir=ltr lang=en-us class=OutlookMessageHeader align=left><FONT size=2
face=Tahoma>-----Original Message-----<BR><B>From:</B>
re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org] <B>On Behalf Of </B>Randy
Brooks<BR><B>Sent:</B> Wednesday, May 19, 2010 2:01 PM<BR><B>To:</B>
RE-wrenches<BR><B>Subject:</B> Re: [RE-wrenches] SWH - mixing
valves<BR><BR></FONT></DIV>Kelly,
<DIV><BR></DIV>
<DIV>Although I'm no plumber, I think there is a difference between "mixing
valves" and "anti-scald valves". I believe mixing valves don't change
with water temperature, so it's hard to get consistent water temperature at
the faucet with varying solar hot water temperature. I believe
anti-scald valves adjust cold water input with hot water temperature to
prevent an unsafe temperature at the faucet. I'd talk it over with your
plumber.</DIV>
<DIV><BR></DIV>
<DIV>take care,</DIV>
<DIV><BR>
<DIV><SPAN
style="WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 0px; BORDER-COLLAPSE: separate; FONT: 12px 'Times New Roman'; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(0,0,0); WORD-SPACING: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0"
class=Apple-style-span>
<P style="MARGIN: 0px"><FONT style="FONT: 12px 'Times New Roman'" size=3
face="Times New Roman">Randy Brooks</FONT></P>
<P style="MARGIN: 0px"><FONT style="FONT: 12px 'Times New Roman'" size=3
face="Times New Roman">Brooks Solar, Inc.</FONT></P>
<P style="MARGIN: 0px"><FONT style="FONT: 12px 'Times New Roman'" size=3
face="Times New Roman"><B><I>Solar Power for People</I></B></FONT></P>
<P style="MARGIN: 0px"><FONT style="FONT: 12px 'Times New Roman'" size=3
face="Times New Roman">140 Columbia View</FONT></P>
<P style="MARGIN: 0px"><FONT style="FONT: 12px 'Times New Roman'" size=3
face="Times New Roman">Chelan, WA<SPAN class=Apple-converted-space> <SPAN
class=Apple-converted-space> </SPAN></SPAN>98816</FONT></P>
<P style="MARGIN: 0px"><FONT style="FONT: 12px 'Times New Roman'" size=3
face="Times New Roman">509-682-9646</FONT></P>
<P style="MARGIN: 0px"><FONT style="FONT: 12px 'Times New Roman'" size=3
face="Times New Roman"><A
href="mailto:Randy@BrooksSolar.com">Randy@BrooksSolar.com</A></FONT></P>
<P style="MARGIN: 0px"><FONT style="FONT: 12px 'Times New Roman'" size=3
face="Times New Roman"><A
href="http://www.BrooksSolar.com">www.BrooksSolar.com</A></FONT></P></SPAN></DIV><BR>
<DIV>
<BLOCKQUOTE type="cite">
<DIV><FONT class=Apple-style-span color=#000000><BR></FONT>On May 19, 2010,
at 2:14 AM, Kelly Keilwitz, Whidbey Sun & Wind wrote:<BR><BR>
<BLOCKQUOTE type="cite">Thermal wrenches,<BR></BLOCKQUOTE>
<BLOCKQUOTE type="cite">I'm having an ongoing issue with mixing valves in
my own system not keeping a steady mix domestic HW temperature as the tank
temperature varies with solar heating. If I set it for (say) 122¢ªF mix
when the tank is 135¢ª, it seems to hold that differential at all tank
temps - i.e. when the tank is hotter the mix is too hot (sometimes
dangerously so), and when colder the mix is too cold for a comfortable
shower. Thus, I need to change the setting all the time.<BR></BLOCKQUOTE>
<BLOCKQUOTE type="cite"><BR></BLOCKQUOTE>
<BLOCKQUOTE type="cite">I'm now using a Honeywell valve with a 90¢ª - 145¢ª
range. This is a replacement for a valve with a wider range that acted the
same way. Any ideas, suggestions for better valves,
or....?<BR></BLOCKQUOTE>
<BLOCKQUOTE type="cite"><BR></BLOCKQUOTE>
<BLOCKQUOTE type="cite">This has me wondering how many of our SWH
customers are experiencing a similar thing, but just aren't bothered
enough to say anything. We seem to have encountered many plumbing
situations where the mixing valve allowed weird backflow or siphoning
situations to mess with system operation, especially with HW
recirculation. I thought I had all such causes eliminated on my system,
but maybe not.<BR></BLOCKQUOTE>
<BLOCKQUOTE type="cite"><BR></BLOCKQUOTE>
<BLOCKQUOTE type="cite">Thanks for sharing your experience with such
matters.<BR></BLOCKQUOTE>
<BLOCKQUOTE type="cite">-Kelly<BR></BLOCKQUOTE>
<BLOCKQUOTE type="cite"><BR></BLOCKQUOTE>
<BLOCKQUOTE type="cite">Kelly Keilwitz, P.E.<BR></BLOCKQUOTE>
<BLOCKQUOTE type="cite">Whidbey Sun & Wind<BR></BLOCKQUOTE>
<BLOCKQUOTE type="cite">Renewable Energy Systems<BR></BLOCKQUOTE>
<BLOCKQUOTE type="cite"><A
href="mailto:kelly@whidbeysunwind.com">kelly@whidbeysunwind.com</A><BR></BLOCKQUOTE>
<BLOCKQUOTE type="cite">360-678-7131<BR></BLOCKQUOTE>
<BLOCKQUOTE type="cite"><BR></BLOCKQUOTE>
<BLOCKQUOTE type="cite"><BR></BLOCKQUOTE>
<BLOCKQUOTE type="cite"><BR></BLOCKQUOTE>
<BLOCKQUOTE type="cite"><BR></BLOCKQUOTE>
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