At the risk of asking a really dumb question.....Is something akin to an
automotive cooling system "stop leak" product ever put into a hydronic
heating system to plug a small leak (maybe as just a stopgap "fix")
without screwing up something else in the system?
I thought about that because I know its not uncommon to use an
antifreeze mixture in hydronic heating systems at places like vacation
homes where the temperature may deliberately or accidentally get down to
freezing when the place is unoccupied.
I don't know if there is or not but I did think about that. Then I
decided that I should just fix it properly because I don't know how
long something like that would be effective.
I'd end up having to fix it sometime anyway.
Y'know I thought about that but then said to myself that I'd never heard
of it causing problems with the valves which control the flow of water
through the heater core in most cars, so maybe that "stop leak" stuff
only "clogs" small holes between the fluid side and the "outside".
But, I'll take your woid for it...<G>
Yeah, the "stop leak" stuff is a bunch of small particles that are
supposed to clog and block any small holes to the outside world.
There's no worry about blocking the thermostat because that's a *big*
opening when it's open. Nor do you care about the thermostat not quite
closing properly because it has a deliberate bypass passage so there's
always some coolant flowing anyway.
On the other hand, solenoid valves sometimes have very small pilot
valves (that switch water pressure that then opens the main valve). You
wouldn't want to block that or the valve might not open. Nor would you
want the main valve to leak when it's supposed to be off, since that
might mean heat in a room that is already warm enough.
In the winter when the heat is running you "may" be able to detect a
difference in temperature between the supply and return pipes at a
radiator. The best way would be to visually inspect the piping and trace
back to the circulator pump. BTW, there will be pressure on both lines, I'm
not understanding what you are trying to do to find the leak. How
will capping of a line help?
There are no stupid questions, but there are lots of stupid answers.
Larry Wasserman - Baltimore Maryland - lwasserm(a)sdf. lonestar. org
Any reason you can't just turn down the thermostates until the system
goes cold (or at least cool), then turn up a thermostat so the system
comes on and feel which pipe gets hotter before the other.
It's rather low tech but that's the way it's been done for
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