Combustion – Timer – programmer – retarder or condition responsive control – Responsive to combustion chamber pressure
Patent
1998-03-27
1999-11-30
Lazarus, Ira S.
Combustion
Timer, programmer, retarder or condition responsive control
Responsive to combustion chamber pressure
431 12, 431 20, 126116A, F23N 524, F23N 1144, F24H 300
Patent
active
059931957
ABSTRACT:
A combustion air regulating apparatus which is adapted for use with two stage induced draft furnaces and which allows such furnaces to be used with low cost AC inducer motors of the type having one or a small number of nominally fixed operating speeds. A flow restrictor assembly is disposed in fluidic series with the air intake and the exhaust vent to controllably restrict the flow of air through the burner box when the inducer motor operates at its low speed. A pressure sensing assembly is connected to sense a pressure approximately equal to that across the heat exchanger, and to control the flow resistance of the flow restrictor assembly to maintain a sufficient level of excess air when the furnace operates in its low stage. A solenoid valve responsive to the establishment of high stage furnace operation causes the flow restrictor assembly to establish and maintain its minimum flow resistance during operation in that stage.
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North American Combustion Handbook, vol. II, 3d edition, pp. 46 through 60.
Carrier Corporation
Lazarus Ira S.
Lee David
LandOfFree
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