Combustion – Timer – programmer – retarder or condition responsive control – Of or by exhaust damper or exhaust pump
Patent
1984-03-12
1988-06-21
Dority, Jr., Carroll B.
Combustion
Timer, programmer, retarder or condition responsive control
Of or by exhaust damper or exhaust pump
431 31, 126116A, F23N 300
Patent
active
047522100
ABSTRACT:
An improved power vent and associated control system for a heating apparatus such as a furnace. The invention utilizes a vent blower and a flow control orifice device permitting the use of a single size air moving device and motor with different size furnaces. The control is arranged to discontinue delivery of fuel to the furnace in the event of a blockage of the furnace flue or a failure of the air moving structure. In one form of the invention, a pressure condition is sensed downstream of the air moving structure to detect the failure conditions. In another form of the invention, the control utilizes structure to sense the speed of the air moving device. The invention comprehends the use of a motor for driving the air moving device which varies in speed substantially between the unloaded and loaded conditions. The air moving device preferably unloads under high discharge pressure conditions, such as by a blocked flue. In a preferred form of the invention, a closure closes the orifice during periods when the vent blower is not operating. The closure is responsive to fluid movement through the orifice to move automatically to an open condition.
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Dority Jr. Carroll B.
Heil Quaker Corporation
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