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US 4,907,737 AGranted
Electronic control system for a gas-fired/hot air furnace with induced draft blower
AssigneeR. E. Phelon Company, Inc.
InventorRoger W. Williams, Jr.
Life of this patent
Estimating the term…
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AssigneeR. E. Phelon Company, Inc.
InventorRoger W. Williams, Jr.
Estimating the term…
Electronic control system for a gas-fired/hot air furnace includes a primary control unit which controls the flow of fuel to the furnace. The furnace has heating and cooling space thermostats and a comfort fan to supply heated or cooled air to the space being monitored by the thermostats and an induced draft blower which supplies combustion air into the furnace for heating. A first switch and associated relay drive selectively energizes the comfort fan for low speed heating operation and a second relay switch and associated relay drive selectively energizes the comfort fan for high speed cooling operation. Actuation of the heating thermostat energizes a third switch and associated relay drive which energizes the induced draft blower. A high temperature thermostat located to sense excessive furnace temperatures is also connected to actuate the third relay to energize the induced draft blower in an excessive temperature condition. The high temperature thermostat is also connected to the relay drive of the second relay switch to energize the high speed operation of the comfort fan in the event of excessive furnace temperature.
Solid state control for a gas-fired/hot air furnace which includes a comfort fan blower having windings adapted when energized to drive the fan at high and low speeds and an induced draft blower adapted to supply air into the combustion chamber of the furnace, said control comprising a normally open heating thermostat switch which upon closing, generates a first signal and a normally closed, over-temp control element adapted to open only when the furnace temperature exceeds a predetermined limit, means responsive to the opening of said control element to generate a second signal, means responsive to said first signal to energize both said induced draft blower and the low speed windings of said comfort fan, and means responsive to said second signal to energize the high speed windings of said comfort blower and said induced draft blower.
Dependencies are inferred from the claim text.