Patent ID: 8777609

Claim:
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 control valve having a first inlet fluid communicable with a first outlet and a second outlet, the first inlet configured to receive the first fuel and the second fuel, 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 adapted to permitting the flow of the first fuel between the second inlet and second outlet of the selector valve and also to permit the flow of the first fuel between the first inlet and first outlet of the selector valve, in the second selector position the selector valve adapted to permitting the flow of the second fuel between the second inlet and second outlet of the selector valve and also prevent the flow of the second fuel between the first inlet and first outlet of the selector valve, the flow of the first fuel and the second 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 the first fuel and the second 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.