Furnace control using induced draft blower and exhaust gas diffe

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

1980-07-21

1982-06-15

Scott, Samuel

Combustion

Timer, programmer, retarder or condition responsive control

Of or by exhaust damper or exhaust pump

431 12, 126116A, 236 15BD, 236 15C, F23J 300, F23J 108

Patent

active

043348556

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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