Negative pressure conditioning device and forced air furnace employing same
First Claim
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1. A pneumatic signal conditioning device configured to provide a conditioned pressure signal representing a pressure drop across a heat exchanger, the pneumatic signal conditioning device comprising:
- a first fluid path comprising a first inlet and a first outlet, the first fluid path configured such that the first outlet provides a first conditioned signal representing a burner box pressure at the first inlet;
a second fluid path comprising a second inlet and a second outlet, the second fluid path configured such that the second outlet provides a second conditioned signal representing a collector box pressure at the second inlet;
a third fluid path disposed between the first fluid path and the second fluid path, thereby providing fluid communication between the first fluid path and the second fluid path; and
wherein a difference between the first conditioned signal and the second conditioned signal represents the pressure drop across the heat exchanger.
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Abstract
A pneumatic signal conditioning device may have a first fluid path and a second fluid path. The first fluid path includes a first inlet and a first outlet, and is configured such that the first outlet provides a first conditioned signal representing a pressure at the first inlet. Similarly, the second fluid path is configured such that the second outlet provides a second conditioned signal representing a pressure at the second inlet.
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Citations
17 Claims
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1. A pneumatic signal conditioning device configured to provide a conditioned pressure signal representing a pressure drop across a heat exchanger, the pneumatic signal conditioning device comprising:
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a first fluid path comprising a first inlet and a first outlet, the first fluid path configured such that the first outlet provides a first conditioned signal representing a burner box pressure at the first inlet; a second fluid path comprising a second inlet and a second outlet, the second fluid path configured such that the second outlet provides a second conditioned signal representing a collector box pressure at the second inlet; a third fluid path disposed between the first fluid path and the second fluid path, thereby providing fluid communication between the first fluid path and the second fluid path; and wherein a difference between the first conditioned signal and the second conditioned signal represents the pressure drop across the heat exchanger. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A forced-air furnace comprising:
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a heat exchanger having an upstream port and a downstream port; a burner configured to burn fuel and provide combustion products to the heat exchanger; a gas valve configured to provide fuel to the burner, the gas valve comprising a first pressure port and a second pressure port; and a pneumatic signal conditioning device comprising; a first fluid path comprising a first inlet and a first outlet, the first fluid path configured such that the first outlet provides a first conditioned signal representing a pressure at the first inlet; and a second fluid path comprising a second inlet and a second outlet, the second fluid path configured such that the second outlet provides a second conditioned signal representing a pressure at the second inlet; wherein the first inlet is in fluid communication with the upstream port, the second inlet is in fluid communication with the downstream port, the first outlet is in fluid communication with the first pressure port and the second outlet is in fluid communication with the second pressure port such that a difference between the first outlet and the second outlet provides to the gas valve a conditioned pressure signal representing a pressure drop across the heat exchanger. - View Dependent Claims (13, 14)
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15. A negative pressure conditioning device for use with a forced air furnace having a gas valve, a burner manifold and a collector box, the negative pressure conditioning device comprising:
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a first gas valve port adapted to be in fluid communication with the gas valve, a first conditioning orifice contained within the first gas valve port; a second gas valve port adapted to be in fluid communication with the gas valve, a second conditioning orifice contained within the second gas valve port; a burner manifold port adapted to be in fluid communication with the burner manifold, a burner manifold conditioning orifice contained within the burner manifold port; and a collector box port adapted to be in fluid communication with the collector box, a collector box conditioning orifice contained within the collector box port.
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16. A pneumatic signal conditioning device configured to provide a conditioned pressure signal representing a pressure drop across a heat exchanger, the pneumatic signal conditioning device comprising:
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a first fluid path comprising a first inlet and a first outlet, the first fluid path configured such that the first outlet provides a first conditioned signal representing a burner box pressure at the first inlet; a second fluid path comprising a second inlet and a second outlet, the second fluid path configured such that the second outlet provides a second conditioned signal representing a collector box pressure at the second inlet; a reference vent in fluid communication with at least one of the first fluid path and the second fluid path; and wherein a difference between the first conditioned signal and the second conditioned signal represents the pressure drop across the heat exchanger. - View Dependent Claims (17)
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Specification