Furnace control using induced draft blower and exhaust gas differential pressure sensing
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United States of America Patent
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-
Jun 15, 1982
Grant Date -
N/A
app pub date -
Jul 21, 1980
filing date -
Jul 21, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A heating system of the type having a combustion chamber with a fuel burner, an inlet for combustion air and an exhaust stack is improved by adding a variable-speed induced draft blower, a flow-restricting stack orifice and a fuel valve sensitive to the exhaust gas flow rate through the stack orifice. The fuel valve turns on at a first predetermined exhaust gas flow rate and turns off at a second predetermined exhaust gas flow rate, which is lower than the first predetermined rate. The fuel valve also supplies fuel at a rate proportional to the exhaust gas flow rate. Sensing of the differential pressure across the stack orifice is used to determine the exhaust gas flow rate.
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