Exhaust flue damper and control system therefor

Details Exhaust flue damper and control system therefor Exhaust flue damper and control system therefor

1977-09-12

1980-01-29

Lawson, Patrick D.

Automatic temperature and humidity regulation

Miscellaneous

Burner controls with automatic cutoff

236 1H, G05D 2312

Patent

active

041857690

ABSTRACT:
A control system for a damper installed in the exhaust flue of a furnace, by which activation of the furnace is rendered impossible unless the damper is in its fully open position. The control system achieves that objective by making completion of the energizing circuit of the solenoid that controls flow of fuel to the burner dependent upon closure of a normally open switch that is closed by the movement of the damper to its open position, and by opening the damper with an electric motor that is controlled by a relay energized in response to a call for heat at the thermostat.

REFERENCES:
patent: 2397879 (1946-04-01), Morrow
patent: 2633299 (1953-03-01), Brown
patent: 2698140 (1954-12-01), Buehler

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