Stoves and furnaces – Hot-air furnaces – Liquid or gaseous fuel
Patent
1989-09-28
1990-08-28
Yeung, James C.
Stoves and furnaces
Hot-air furnaces
Liquid or gaseous fuel
126116A, 431 18, 431 20, F24H 300
Patent
active
049516515
ABSTRACT:
In an inducted draft, fuel-fired furnace a flow restriction in the external exhaust flue is detected, and the furnace burners responsively deactivated, by a thermal sensing switch mounted in a spaced relationship with a small flow opening formed in a sensor housing externally secured to the inducer fan outlet section over a wall opening therein. During normal burner combustion product discharge flow through the exhaust flue, a small vane within the inducer fan outlet section creates a venturi therein which draws ambient air within the furnace housing across the temperature sensing switch and into the fan outlet section through the sensor housing opening. The temperature of this ambient air is below the switch set point so that continued burner operation is permitted. However, if the exhaust flue becomes restricted or blocked the resulting pressure increase within the inducer fan outlet section overcomes the venturi effect therein and forces hot burner combustion products outwardly through the sensor housing and across the temperature sensing switch. When the temperature of the switch reaches its set point, the switch operates to deactivate the furnace burners.
REFERENCES:
patent: 28013 (1974-05-01), McLarty
patent: 2913044 (1959-11-01), Mobley
patent: 3403962 (1968-10-01), Suffron et al.
patent: 3537803 (1970-11-01), Ignazio
patent: 3542018 (1970-11-01), Quick
patent: 4102627 (1978-07-01), Reed et al.
patent: 4204833 (1980-05-01), Kmetz et al.
patent: 4289271 (1981-09-01), Barth
patent: 4355970 (1982-10-01), Kitagawa et al.
patent: 4401425 (1983-08-01), Gable
patent: 4708636 (1987-11-01), Johnson
patent: 4752210 (1988-06-01), Trent
Rheem Manufacturing Company
Yeung James C.
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