Furnace control using induced draft blower and exhaust gas...

Details Furnace control using induced draft blower and exhaust gas... Furnace control using induced draft blower and exhaust gas...

F - Mech Eng,Light,Heat,Weapons

23

N

110/69

F23N 1/06 (2006.01) F23N 5/18 (2006.01)

Patent

CA 1156098

FURNACE CONTROL USING INDUCED DRAFT BLOWER AND EXHAUST GAS DIFFERENTIAL PRESSURE SENSING Abstract of the Disclosure 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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