Comments on: Is Your Heating System Burning too Much Fuel? http://www.protechhvac.com/what-%e2%80%9cthey%e2%80%9d-don%e2%80%99t-want-you-to-know-about-heating-fuelgas-consumption/ Simple to Sophisticated. Mon, 12 Jul 2010 13:00:33 +0000 hourly 1 http://wordpress.org/?v=3.0.1 By: AJ http://www.protechhvac.com/what-%e2%80%9cthey%e2%80%9d-don%e2%80%99t-want-you-to-know-about-heating-fuelgas-consumption/comment-page-1/#comment-3680 AJ Thu, 11 Feb 2010 21:39:53 +0000 http://www.protechhvac.com/?p=125#comment-3680 Hello What a good read lots of your articles have been! You should definitely write more. If Holohans the GURU of New England, than you can claim lil ol NH. Also enjoyed SawZall Eddie and the Van Wrap Expedition. We need more people educated by more than PlumBob's And Oil Giants! One question, in reading below, you stated that "Too low a CO2 percentage of flue gas means the fuel isn’t being completely combusted". Was this a typo or what you belive to be true? We know that low CO2 is a result of improper set-up (under-fire),leaks, excess air, etc. The installer did not set up the combustion process to achieve the carbon dioxide, oxygen, smoke, gross stack temperature and draft levels that the manufacturer intended. Too high a stack temperature (too much negative draft in the smoke pipe) means too much heat is escaping up the chimney. Too low a CO2 percentage of flue gas means the fuel isn’t being completely combusted (at least as much as is possible with the equipment). Too much smoke in a smoke test means the boiler or furnace will “soot up” quickly. An 1/8″ of soot is equivalent to an inch of fiberglass insulation. You don’t want insulation on the heat exchanger, otherwise the heat generated by combustion will not transfer into the heating medium – air or water – and the heat will go up the chimney in excessive stack temperature. Hello What a good read lots of your articles have been! You should definitely write more. If Holohans the GURU of New England, than you can claim lil ol NH. Also enjoyed SawZall Eddie and the Van Wrap Expedition. We need more people educated by more than PlumBob's And Oil Giants! One question, in reading below, you stated that "Too low a CO2 percentage of flue gas means the fuel isn’t being completely combusted". Was this a typo or what you belive to be true? We know that low CO2 is a result of improper set-up (under-fire),leaks, excess air, etc.

The installer did not set up the combustion process to achieve the carbon dioxide, oxygen, smoke, gross stack temperature and draft levels that the manufacturer intended. Too high a stack temperature (too much negative draft in the smoke pipe) means too much heat is escaping up the chimney. Too low a CO2 percentage of flue gas means the fuel isn’t being completely combusted (at least as much as is possible with the equipment). Too much smoke in a smoke test means the boiler or furnace will “soot up” quickly. An 1/8″ of soot is equivalent to an inch of fiberglass insulation. You don’t want insulation on the heat exchanger, otherwise the heat generated by combustion will not transfer into the heating medium – air or water – and the heat will go up the chimney in excessive stack temperature.

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