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Electronic programmable thermostat

  • US 4,751,961 A
  • Filed: 11/17/1986
  • Issued: 06/21/1988
  • Est. Priority Date: 02/18/1986
  • Status: Expired due to Term
First Claim
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1. A thermostat for controlling the application of electrical power to a temperature modifying device comprising:

  • an operator actuable set point means for determining a normal temperature;

    a temperature sensing means having an electrical characteristic which varies as a function of ambient temperature;

    a clock operative to generate digital electrical signals indicative of the current time;

    a state selector memory having stored therein multiple separate predetermined temperature programs, each predetermined temperature program including digital signals indicative of either a normal temperature or a set back temperature at particular times over a repetitive time cycle;

    a temperature program indicator means connected to said state selector memory for generating a first operator perceivable indication when digital signals indicative of said normal temperature are generated by said state selector memory and a second operator perceivable indication when digital signals indicative of said set back temperature are generated by said state selector memory;

    a manually operable temperature program selection means for selection of one of said predetermined temperature programs;

    a means for applying the output of said clock to said state selector memory thereby causing said state selector memory to generate a digital signal indicative of either a normal temperature or a set back temperature corresponding to said selected predetermined temperature program for the current time; and

    a control means connected to said operator actuable set point means, said temperature sensing means and receiving the digital signal indicative of either a normal temperature or a set back temperature generated by said state selector memory for generating a control signal for the temperature modifying device based upon the relation of the ambient temperature to a normal temperature determined by said set point means when digital signals indicative of said normal temperature are generated by said state selector memory and for generating a control signal for the temperature modifying device based upon the relation of the ambient temperature to a temperature having a predetermined number of degrees offset from said normal temperature determined by said set point means when digital signals indicative of said set back temperature are generated by said state selector memory.

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