NEGATIVE PRESSURE CONDITIONING DEVICE AND FORCED AIR FURNACE EMPLOYING SAME
First Claim
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1. 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.
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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
24 Claims
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1. A 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 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. 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. - View Dependent Claims (16, 17)
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18. A furnace comprising:
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a burner manifold;
a collector box;
a heat exchanger, the heat exchanger including an inlet in fluid communication with the burner manifold and an outlet in fluid communication with the collector box;
a gas valve configured to provide fuel to the burner manifold in response to a signal representing a pressure drop between the burner and the collector box; and
conditioning means to condition the signal. - View Dependent Claims (19, 20, 21)
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22. 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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23. A method of controlling a forced-air furnace comprising a burner, a collector box and a gas valve controlling gas flow to the burner, the method comprising the steps of:
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monitoring a first pressure at the burner;
monitoring a second pressure at the collector box;
providing a conditioned signal representing a difference between the first pressure and the second pressure; and
using the conditioned signal to affect operation of the gas valve. - View Dependent Claims (24)
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Specification