Automatic temperature and humidity regulation – Miscellaneous – Burner controls with automatic cutoff
Patent
1977-06-06
1979-03-13
Garrett, Robert E.
Automatic temperature and humidity regulation
Miscellaneous
Burner controls with automatic cutoff
110163, 126285B, 200 819HG, F23N 106, F23N 518
Patent
active
041438116
ABSTRACT:
A gas furnace employs an exhaust flue damper driven by an electric motor equipped with position indicating switches. A gas flow detector switch supported in the gas line has a vertical passage and a valve member gravity biased into a rest position in which it blocks gas flow through the passage. Fuel flow through the line creates a differential pressure on the valve, raising it above the rest position. Circuitry interconnecting the damper drive and position indicating switches and the gas flow switch with the furnace thermostat and the gas line control valve, positions the damper in a closed position when there is no gas flow to the furnace and in an open position otherwise and prevents energization of the gas flow valve when the damper is closed.
REFERENCES:
patent: 1737835 (1929-12-01), Ehlers
patent: 1813395 (1931-07-01), Fraser
patent: 1959970 (1934-05-01), Stinson
patent: 2173370 (1939-04-01), Parachek
patent: 2214092 (1940-09-01), Uhlhorn
patent: 2241661 (1941-05-01), Furlong
patent: 2244373 (1941-06-01), Powers
patent: 2808209 (1957-10-01), Bressler
patent: 3273625 (1966-09-01), Holtzman et al.
patent: 3415119 (1968-12-01), Moore
patent: 4039123 (1977-08-01), Frankel
patent: 4108369 (1978-08-01), Prikkel
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