System and method for reduced purge operation of a forced draft burner in a water heater
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United States of America Patent
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Mar 28, 1995
Grant Date -
N/A
app pub date -
Oct 27, 1993
filing date -
Oct 27, 1993
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Abstract
A system and method for controlling operation of a water heater provides generating a heating demand signal which a minimum level corresponds to a required heat input for maintaining water temperature in the water tank in case of no exogenous demand for water. Responsive to the heating demand signal, air flow from the forced draft blower and flow of combustible fluid from the combustible fluid delivery system are varied to produce combustion product over a minimum 15 to 1 ratio. This allows water heating to be varied to meet maximum expected exogenous demand or to maintain water temperature with no exogenous demand.
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