F - Mech Eng,Light,Heat,Weapons – 24 – H
Patent
F - Mech Eng,Light,Heat,Weapons
24
H
F24H 9/14 (2006.01) F24D 12/02 (2006.01) F28D 21/00 (2006.01) F28F 9/26 (2006.01) F28F 27/00 (2006.01)
Patent
CA 2136114
A method of connecting a heat exchanger to a forced air furnace is described. Firstly, connect a valve to the hot exhaust gas outlet of a furnace. The valve has a generally "L" shaped valve body. The valve body includes a primary passage. A diversion passage intersects the primary passage. A diversion return port intersects the primary passage downstream of the diversion passage. A butterfly valve member is pivotally mounted at the intersection of the primary passage and the diversion passage. The valve member has a first wing and a second wing. The valve has an open position and a closed position. The valve member is normally in the open position. Secondly, connect a fresh air outlet of a heat exchanger to a fresh air inlet on the furnace. Thirdly, connect the heat exchanger to the valve by using a first conduit to connect the diversion passage of the valve to an exhaust gas inlet of a heat exchanger, and a second conduit to connect the diversion return port of the valve to the exhaust gas outlet of the heat exchanger. An electric blower circulates exhaust gas through the first conduit and the second conduit upon activation of the furnace. Upon activation of the blower the valve member is drawn into the closed position by a forced circulation of exhaust gases by the blower out of the primary passage into the diversion passage and through the diversion return port into the primary passage.
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