Stoves and furnaces – Hot-air furnaces – Compressed air
Patent
1999-09-27
2000-12-19
Lazarus, Ira S.
Stoves and furnaces
Hot-air furnaces
Compressed air
126116A, 126116R, 236 11, 431 18, F24B 704
Patent
active
061615358
ABSTRACT:
A method and apparatus for increasing the circulating airflow of induced-draft, gas-fired multi-stage furnaces without creating conditions that result in cold spot corrosion therein. Control circuitry is provided to selectably increase the circulating airflow of the furnace during low stage operation. The control circuitry is arranged so that increases in the magnitude of the circulating airflow of the furnace are accompanied by predetermined increases in the magnitude of the combustion airflow of the furnace. The magnitudes of the circulating and combustion airflows are so related to one another that the temperature at the output of the heat exchanger is maintained at a value which is approximately constant, and which is high enough to assure that water cannot condense thereon. The control circuitry may include a relay or relay-like device that is connected to prevent the high stage solenoid of the gas valve from becoming actuated during low stage operation.
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Dempsey Daniel Joseph
Thompson Kevin Dale
Carrier Corporation
Lazarus Ira S.
Lee David
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