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Negative pressure conditioning device and forced air furnace employing same

  • US 7,644,712 B2
  • Filed: 11/09/2005
  • Issued: 01/12/2010
  • Est. Priority Date: 11/09/2005
  • Status: Active Grant
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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