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Air heater control

  • US 6,431,457 B1
  • Filed: 09/13/2000
  • Issued: 08/13/2002
  • Est. Priority Date: 09/28/1999
  • Status: Expired due to Term
First Claim
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1. A direct fired recirculating air heater, comprising:

  • a burner;

    an outdoor air path to said heater and a return air path to said heater;

    a first temperature sensor which is operable to measure outdoor air temperature and a second temperature sensor which is operable to measure return air temperature; and

    a control which is operable to control said heater in response to at least said first and second temperature sensors and an amount of outdoor air being inducted to said heater via said outdoor air path.

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