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Auto changeover thermostat with means for handling temperature entry errors

  • US 4,446,913 A
  • Filed: 07/05/1983
  • Issued: 05/08/1984
  • Est. Priority Date: 07/05/1983
  • Status: Expired due to Term
First Claim
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1. A thermostat for controlling a temperture conditioning system to selectively heat or cool a comfort zone to a heating or cooling setpoint, respectively, said thermostat comprisinga. a digital keypad including a plurality of keys, each associated with an alphanumeric value;

  • b. memory means for storing the heating and cooling setpoints entered by an operator on the digital keypad;

    c. means for displaying the heating and cooling setpoints; and

    d. control means for controlling the temperature conditioning system to selectively condition the comfort zone to the heating or the cooling setpoint, said control means being connected to the digital keypad, the display means and memory means and operative to automatically maintain at least a predetermined offset between the heating and cooling setpoints by adjusting the value of one of the setpoints as the other setpoint is entered by the operator, and displaying the adjusted value to the operator to alert him of the change, so that the adjusted value may either be entered into the memory means or changed by the operator.

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