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Microcomputer control for supplemental heating with night set-back

  • US 4,265,298 A
  • Filed: 09/28/1979
  • Issued: 05/05/1981
  • Est. Priority Date: 09/28/1979
  • Status: Expired due to Term
First Claim
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1. A heat pump and refrigeration system for conditioning a space and having a closed refrigerant circuit including a compressor, a condenser, an expansion device, and an evaporator connected respectively in series, said system comprising:

  • first sensing means for measuring the temperature of a space to be conditioned and generating an electrical signal representative of the measured temperature;

    means for setting at least a first lower reference temperature of the conditioned space and at least a second higher reference temperature of the conditioned space;

    heating means including at least three stages of supplemental electric heaters for generating of heat to the conditioned space;

    second sensing means for measuring the temperature of the outdoor atmospheric temperature and generating a second electrical signal representative of the outdoor temperature;

    programmed control means responsive to said first sensing means, said setting means, and said second sensing means for generating a signal to activate said heating means;

    set-back means for automatically changing said setting means from said first reference temperature to said second reference at a predetermined time of day;

    said control means activating a first one of said three stages of electric heaters when the measured temperature at a particular sampling time is less than a corresponding calculated temperature for that sampling time for at least two consecutive sampling times; and

    data processor means having a program coupled to said control means and said set-back means for controlling the operation thereof to affect a measured temperature of the conditioned space.

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