THAW CYCLE IN CONDENSING STYLE GAS FURNACES
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United States of America Patent
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Issued Date -
Dec 10, 2015
app pub date -
Jun 9, 2014
filing date -
Jun 9, 2014
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Abstract
A condensing gas furnace having an inducer for drawing exhaust produced by a burner through an exhaust path and venting the exhaust from the furnace. A pressure sensor positioned within the exhaust path to determine if the inducer is creating a negative pressure in the exhaust path preventing accumulation of exhaust within the exhaust path. The inducer includes a supplemental sensor for monitoring rotation of a fan of the inducer. The burner is not ignited when both sensors fail to indicate proper venting of the exhaust path. The burner is operated for a predetermined period of time when only the supplemental sensor signals rotation of the fan to thaw any condensate on the supplemental sensor.
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