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The only goof is that the 24V from the transformer is AC so it really doesn't have a + or - side to it -- it's more or less a "hot/neutral" thing instead. Otherwise, what you have drawn out will work just fine.


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When the boiler is not heating, no gas is flowing, and you will measure the static input pressure of the gas supply line. The input pressure at the boiler drops when the boiler calls for heat because the gas is flowing during heating, and pressure drops occur in the gas piping upstream from your boiler due to the gas flow. Without knowing the flowing gas ...


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I know it's in the comments, but I feel it's important enough to place in an answer: Never EVER throw water on a fire that is , or might be, oil or gasoline - based! If your furnace does not have an automatic thermal cutoff valve on the fuel line inlet, you're out of code (at least in Massachusetts), and should definitely have a plumber install one. Keep ...


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From reading all that you wrote, including the update, it is clear that there is an oil leak somewhere in the furnace mechanism or in the fuel line leading up to the furnace. You should continue to keep the furnace off until you can get an oil furnace repair professional in to take a detailed look at what has gone wrong and get it fixed properly. You will ...


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Do you have an automatic fill valve? Is there a manual valve in line with it? Try closing the manual valve if there is one. If that solves your problem, adjust and/or replace the automatic fill valve. If you have a (domestic/potable) hot water coil, that could be leaking into the boiler, too. Shut off the domestic hot water supply on the cold side of the ...



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