Patent ID: 8403661
Filing Date: 2013-03-26
Classification: F23C,F23N,F24H

Abstract:
1. A dual fuel heater comprising: a first oxygen depletion sensor adapted for a first fuel, a second oxygen depletion sensor adapted for a second fuel, a main burner adapted for both the first fuel and the second fuel, a single pressure regulator having a single fuel inlet and a single fuel outlet and adapted to regulate the pressure at the single fuel outlet of the first fuel delivered at the single fuel inlet at a first pressure or the second fuel delivered at the single fuel inlet at a second pressure, a control valve having a first inlet fluid communicable with a first outlet and a second outlet, the first inlet coupled to the single fuel outlet of the single pressure regulator, the control valve adapted to control the flow of fuel to the first and second oxygen depletion sensors through the first outlet and to control the flow of fuel to the main burner through the second outlet, a selector valve comprising a first inlet fluid communicable with a first outlet and a second inlet fluid communicable with a second outlet, the first inlet of the selector valve coupled with the first outlet of the control valve by a first conduit, the second inlet of the selector valve coupled with the second outlet of the control valve by a second conduit, the first outlet of the selector valve in fluid communication with the first oxygen depletion sensor, the second outlet of the selector valve in fluid communication with the main burner, the selector valve adapted to transition between a first selector position and a second selector position, in the first selector position the selector valve permitting the flow of fuel between the second inlet and second outlet of the selector valve through a first orifice calibrated for the first fuel and also permitting the flow of fuel between the first inlet and first outlet of the selector valve, in the second selector position the selector valve permitting the flow of fuel between the second inlet and second outlet of the selector valve through a second orifice calibrated for the second fuel and also preventing the flow of fuel between the first inlet and first outlet of the selector valve, the flow of fuel being permitted to the second oxygen depletion sensor via the first conduit from a location between the first outlet of the control valve and the first inlet of the selector valve so that the flow of fuel to the second oxygen depletion sensor is permitted regardless of whether the selector valve is in the first selector position or in the second selector position.