F - Mech Eng,Light,Heat,Weapons – 23 – L
Patent
F - Mech Eng,Light,Heat,Weapons
23
L
126/21, 158/54
F23L 17/00 (2006.01) F23N 5/24 (2006.01) F24H 9/20 (2006.01) F23N 5/04 (2006.01) F23N 5/18 (2006.01)
Patent
CA 2003799
ABSTRACT In an induced draft, fuel-fired furnace a flow restric- tion 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 com- bustion 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 out- wardly 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.
Blake Cassels & Graydon Llp
Rheem Manufacturing Company
LandOfFree
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