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Method of controlling a space heating system

  • US 4,559,441 A
  • Filed: 02/13/1984
  • Issued: 12/17/1985
  • Est. Priority Date: 02/13/1984
  • Status: Expired due to Term
First Claim
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1. A method of controlling a space heating system having a first controlled resistance heater adapted for modulated control by intermittent energization, and a plurality of second resistance heaters, said method including the steps of:

  • selecting a total bit count representative of the entire heating capacity of said heating system;

    generating a signal representative of a set point temperature to be maintained within a space;

    generating a signal representative of the actual temperature within said space;

    computing the aggregate number of said resistance heaters required to be energized to raise said actual temperature to a value equivalent to said set point temperature, said aggregate number including a fractional component;

    resolving said fractional component to a first bit count representative of a portion of a cycle time during which said controlled heater is to be energized, said cycle time being at least one second and not greater than thirty seconds, said;

    repetitively, intermittently energizing said controller heater over said cycle time, said controlled heater being energized for that portion of said cycle time represented by said first bit count, said controlled heater being de-energized for that portion of said cycle time represented by the difference between said total bit count and said first bit count.

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