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Thermostat with selectable temperature sensor inputs

  • US 5,611,484 A
  • Filed: 12/17/1993
  • Issued: 03/18/1997
  • Est. Priority Date: 12/17/1993
  • Status: Expired due to Term
First Claim
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1. In a thermostat having:

  • a switch having a control terminal and a pair of power terminals, and electrically making a connection between the power terminals responsive to presence of a demand signal at the control terminal; and

    a control circuit having a sensor signal input terminal and an output terminal providing the demand signal to the switch'"'"'s control terminal responsive to presence of a signal level within a selectable range at the sensor signal input terminal, an improvement comprising;

    a) at least first and second temperature sensors each providing a sensor signal representative of the temperature ambient thereto;

    b) a sensor selection means receiving i) each sensor signal, and ii) a control input signal having at least two values, each of said values designating a different sensor signal, for providing the one of said sensor signals designated by the control input signal to the sensor signal input terminal of the control circuit; and

    c) a countdown timer having an input element providing a time interval value, said timer recording the time interval value, altering the time interval value at a preselected rate, and changing the control input signal provided to the control circuit responsive to the contents of the countdown timer reaching a predetermined value.

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