Energy-conserving flue damper

Details Energy-conserving flue damper Energy-conserving flue damper

1976-07-21

1978-03-21

Wayner, William E.

Automatic temperature and humidity regulation

Miscellaneous

Burner controls with automatic cutoff

431 20, F23N 300

Patent

active

040798844

ABSTRACT:
A flue damper to control the exhaust flow in a flue, wherein a flue damper plate is movable from an open position to a closed position by a solenoid operated plunger and returned from the closed position to the open position by a biasing spring. A damper arm actuates a normally-open limit switch closing the limit switch contacts. The limit switch is in series with normally open contacts of a thermostat, fuel valve, and power source, establishing a fuel system circuit. When the damper plate is in the closed position, the limit switch contacts are open and the fuel system circuit is broken. The plunger solenoid is connected in series with normally closed contacts of the thermostat, and power source, establishing an electrical circuit to close the damper plate. Thus, the circuit to close the damper plate and the fuel system circuit are mutually exclusive so that fuel may not be fired within the flue when the damper plate is closed.

REFERENCES:
patent: 2154644 (1939-04-01), Sweatt
patent: 2224705 (1940-12-01), Stringer
patent: 2508885 (1950-05-01), MacKay
patent: 3010451 (1961-11-01), Hodgins
patent: 3090558 (1963-05-01), Vaughn
patent: 3934796 (1976-01-01), Smith, Jr. et al.

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