Randy,
These valves are the Honeywell Sparcomix AM series, which are
certified for "anti-scald" (ASSE 1016 & 1017)
The specs show that, for a hot supply range of 120˚ to 180˚, at a
position #2, the mix temp should vary only from 116˚ to 122˚. The
valve is definitely not working to spec, and not providing "anti-
scald" protection.
Anyone else seen this in their installations?
-Kelly
Kelly Keilwitz, P.E.
Whidbey Sun & Wind
Renewable Energy Systems
ke...@whidbeysunwind.com
360-678-7131
On May 19, 2010, at 11:01 AM, Randy Brooks wrote:
Kelly,
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.
take care,
Randy Brooks
Brooks Solar, Inc.
Solar Power for People
140 Columbia View
Chelan, WA 98816
509-682-9646
ra...@brookssolar.com
www.BrooksSolar.com
On May 19, 2010, at 2:14 AM, Kelly Keilwitz, Whidbey Sun & Wind
wrote:
Thermal wrenches,
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˚F
mix when the tank is 135˚, 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.
I'm now using a Honeywell valve with a 90˚ - 145˚ range. This is
a replacement for a valve with a wider range that acted the same
way. Any ideas, suggestions for better valves, or....?
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.
Thanks for sharing your experience with such matters.
-Kelly
Kelly Keilwitz, P.E.
Whidbey Sun & Wind
Renewable Energy Systems
ke...@whidbeysunwind.com
360-678-7131
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