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Integrated furnace control board and method

  • US 20040220777A1
  • Filed: 04/23/2004
  • Published: 11/04/2004
  • Est. Priority Date: 04/29/2003
  • Status: Abandoned Application
First Claim
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1. In a furnace system having serially connected safety devices and a control having a microprocessor for detecting an error condition and for assigning a unique error code for error events in the operation of the furnace, the method for distinguishing the appropriate error code for a sensed error condition in one of two types of serially connected safety devices, the first safety device being automatically resettable and having a reset time of a known selected time period and the second type of safety device being manually resettable, comprising the steps of:

  • detecting an error condition in the circuit containing the two types of serially connected safety devices, initiating a time sequence at least as long as the known selected time period, monitoring the circuit to determine if the circuit closes within the known selected time period, if the circuit closes within the known selected time period then initiating an operational protocol based on the first safety device, if the circuit remains open after expiration of the known selected time period then initiating an operational protocol based on the second safety device.

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