Combustion – Timer – programmer – retarder or condition responsive control – Responsive to combustion chamber pressure
Reexamination Certificate
2006-09-05
2006-09-05
Cocks, Josiah C. (Department: 3749)
Combustion
Timer, programmer, retarder or condition responsive control
Responsive to combustion chamber pressure
C431S012000, C431S020000, C126S11000R, C126S11600A
Reexamination Certificate
active
07101172
ABSTRACT:
A furnace control system for controlling a gas-fired induced-draft furnace having a variable speed inducer blower. A control apparatus, responsive to a signal corresponding to the magnitude of a pressure difference between an inlet and outlet of the combustion chamber, controls blower motor speed to maintain the pressure difference at a predetermined magnitude corresponding to a selected gas flow rate. Inducer blower motor speed is varied directly and precisely to maintain an optimal pressure drop across the combustion chamber. The control system can be used in multi-stage and modulating furnace systems and in furnace systems utilizing pressure-assist modulating gas valves.
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Cocks Josiah C.
Emerson Electric Co.
Harness & Dickey & Pierce P.L.C.
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