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Posted by Mo Hoaner on March 18, 2007, 12:59 pm
> Hi all,
>
<snip>.
>
> Here's the problem. Every couple of days the system pressure has
> dropped to about 10 or 11 psi at 160 degrees. This effects the
> efficiency of both the radiator heat as well as the potable hot water
> (which is heated bythe boiler).
I wouldn't necessarily agree that reducing the system pressure causes the
radiators, or the potable hot water system to be efficient. If anything, it
may negatively affect them. In other words, it may have a negative effect on
the efficiency. (Learn that there is a difference between those two words)
especially when you are trying to esplain somthin.
> I open the fill valve, purge the air and close it all back up at 18psi
> at 160 degrees. All is well for another couple of days until the
> pressure if back down and I repeat the process.
>
> I don't see any leaks, no water dripping from ceilings or pooling
> anywhere that I can see.
You will..... Or the mosquitos and mice are drinking it fast enough.
> One room of the house is a concrete slab
> floor (converted carport). It has heating pipe within the concrete
> slab.
They call that a snow melting system where I come from, but in Chicago, I
guess that's what they use heated carports for.
> I keep adding water and purging. What could cause the pressure to
> keep dropping?
> I'm out of ideas.
It's also possible that you have a chemistry issue, causing electrolysis -
no... it's got nothing to do with naked beavers. You could be electrolyzing
the water. What happens is that the oxygen and hydrogen atoms split from the
water molecules. The oxygen becomes part of the internals of your system. It
makes a new substance called corrosion. The hydrogen that's left over...
well, what do you think you're purging. Next time you purge - your heating
system, not your system - hold a lit match in the escaping gas. (You know...
how they tell you not to look for a gas leak with a match... But it does
work.) If you get a ball of almost invisible fire that rises rapidly to the
ceiling over the heating system, that would be a good indication of
electrolysis. Depending on how long you've been going though this cycle of
fill and purge - again, your heating system - you may need a complete
replacement. Wait... you might get help from your insurance company. When
you esplain the fire to the arson investigator, just tell them it's ok. The
experts on the InterNet said so.
If it's not electrolysis, it might be something else.
> Thanks in advance,
>
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