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Flow sensor furnace control

  • US 4,708,636 A
  • Filed: 10/10/1985
  • Issued: 11/24/1987
  • Est. Priority Date: 07/08/1983
  • Status: Expired due to Fees
First Claim
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1. In a heating system having a combustion chamber with a fuel burner, an induced draft air blower, a control system including an electrically controlled fuel valve for controlling a supply of fuel to the burner, and an exhaust stack for exhausting combustion products, the improvement comprising:

  • means enabling a dynamic flow between the interior of the exhaust stack and the external ambient atmosphere including a flowmeter housing connected between an opening provided in the wall of the exhaust stack and the external ambient atmosphere, said housing having a single internal chamber having a first opening connected to the opening in the wall of the exhaust stack and having a second opening connected to the external ambient atmosphere;

    an electronic flowmeter disposed in said single internal chamber for directly sensing the rate and direction of flow through the chamber and producing electrical output signals indicative thereof;

    means connecting said electronic flowmeter output signals with said fuel valve, wherein said signals are used to control said fuel valve when predetermined conditions are indicated.

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