The 3-way bypass valve shall have a selfcontained non-adjustable thermostatic element
housed within a cast iron construction. The
valve body shall have female pipe thread
connections and shall be installed on a hydronic
heating system. The valve shall be available
with a choice of integral thermostatic elements
with fixed opening temperatures : 160°F (72°C)
for mounting on the boiler supply side; 140°F
(60°C) or 113°F (45°C) for mounting on the
boiler return side. The bypass piping between
the supply and return must incorporate a
balancing valve to ensure proper flow to the
system.
SteveJ said:Mine is the TERMOVAR 4440A-3
which is "Position 3" oriented at http://www.woodboilers.com/admin/uploads/public/Termovar_Laddventil_ENG.pdf
This is confusing. The 72 degC valves ...
SteveJ said:Is anybody running the termovar on the supply side rather than return?
I have a 160F, and the instructions say to install on supply side.
jebatty said:This is confusing. The 72 degC valves ...
72C = 162F which should be boiler return water temp. I have the same valve, and I set the balancing valve so that boiler return is about 145F+/- with really cool system water (< 100F), and as system return rises to about 130F, boiler return will be about 150F+/-. At about 140F system return, boiler return will be about 160F. As system return continues to rise, as in tank charging, and boiler return rises to 160F+, I will almost completely close down the balancing valve to maximize system flow. I don't close down the balancing valve all the way, although I could as system return rises above 160F, because I have forgotten to open it on a new firing more than once.
SteveJ said:Mole,
Do you have a pic of the termovar install?
Is your circulator on supply or return?
jebatty said:I have the same valve, and I set the balancing valve so that boiler return is about 145F+/- with really cool system water (< 100F),
[A]s system return rises to about 130F, boiler return will be about 150F+/-.
At about 140F system return, boiler return will be about 160F.
As system return continues to rise, as in tank charging, and boiler return rises to 160F+, I will almost completely close down the balancing valve to maximize system flow.
SteveJ said:I did not realize the termovar control was so loose.
Is there any advantage over a tee in the place of the termovar and a balance valve between the supply and tee?
That is, position 1 in the previously linked PDF with the termovar replaced by a tee...
Seems like the restrictive termovar should have some advantage :bug:
SteveJ said:Jim,
Thanks for the picture and the orientation drawing.
One question, my termovar did not come with the unions- can you attach directly to female NPT pipe fittings?
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