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Posted by ~^Johnny^~ on August 27, 2006, 12:28 am
On 30 Jul 2006 10:29:33 -0700, guskz@hotmail.com wrote:
>They say the flue combustion gas will condense and corrode a Cast Iron
>Heat Exchanger if the water return temperature is below 130 deg
>Farenheit, and they adjust this temperature using a piping bypass and
>when the boiler's outlet temperature is say 150 deg Farenheit.
>But then they say the circulator pump starts immediately....so that
>doesn't make sense since the outlet temperature will not have reached
>150 deg Farenheit and therefore the water return temperature will be
>BELOW 130 deg Farenheit???
>Why won't this cause corrosion since the return temperature will be
>below 130 deg. Farenheit and the burner will be running so the
>combustion gas will contact a colder return water temperature heat
>exchanger surface and should logically cause condensation and
>corrosion?
Because rust never sleeps.
--
-john
wide-open at throttle dot info
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>Heat Exchanger if the water return temperature is below 130 deg
>Farenheit, and they adjust this temperature using a piping bypass and
>when the boiler's outlet temperature is say 150 deg Farenheit.
>But then they say the circulator pump starts immediately....so that
>doesn't make sense since the outlet temperature will not have reached
>150 deg Farenheit and therefore the water return temperature will be
>BELOW 130 deg Farenheit???
>Why won't this cause corrosion since the return temperature will be
>below 130 deg. Farenheit and the burner will be running so the
>combustion gas will contact a colder return water temperature heat
>exchanger surface and should logically cause condensation and
>corrosion?