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Adaptive microprocessor control system and method for providing multiple heating modes in twinned furnaces

  • US 5,337,952 A
  • Filed: 07/28/1993
  • Issued: 08/16/1994
  • Est. Priority Date: 07/28/1993
  • Status: Expired due to Term
First Claim
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1. In a heating system containing twinned furnaces capable of independently operating at multiple levels, a method for providing multiple heating modes to satisfy a required heating load during a given cycle, there being some total number of heating modes, wherein each heating mode may be activated for a time interval whose length is a function of furnace activity during a most recent previous cycle, comprising the steps of:

  • determining an existence of a heating load to be satisfied;

    operating both furnaces independently at levels appropriate to a first heating mode for a first time interval that does not exceed a first predetermined limit;

    for each subsequent heating mode up to a number of one less than the total number of heating modes, operating both furnaces independently at levels appropriate to said subsequent heating mode for a subsequent time interval that does not exceed a subsequent predetermined limit; and

    operating both furnaces independently at levels appropriate to a final heating mode for a final time interval until the heating load is satisfied;

    calculating a thermal load requirement as a function of all of said time intervals; and

    predetermining all of said predetermined time intervals for a next cycle from the calculated thermal load requirement.

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