US 3,945,564 A · Temperature control system

Abstract

A temperature control system for providing an automatic reduction in the temperature of a room or a house during the nighttime hours which requires only the conventional two conductor wiring between the furnace and the thermostat thereby avoiding the necessity of adding to or replacing the existing wiring between the furnace and the thermostat. The system includes a temperature responsive element, a heater near the temperature responsive element for providing supplemental heating of the element, a conventional furnace control, a clock-operated current control for the heater, and a diode steering circuit for directing one portion of an alternating current waveform through the heater current control and the heater, and another portion of the alternating current waveform through the temperature responsive element and the furnace control for providing independent control of the heater and the furnace control. The heater provides supplementary heating of the temperature responsive element during the nighttime hours to establish an apparent room temperature which is higher than the actual room temperature so that the thermostat element will lower the room temperature during the nighttime hours.

Claims19

Dependent claims

A system for controlling temperature at a first location from a remotely located second location utilizing a source of time varying electrical energy which alternates between two directions of current flow and two conductors extending from said first location to said second location comprising:

a first system portion located at said first location including temperature responsive means for responding to the temperature at said first location and a heat source in heat transfer relationship with said temperature responsive means for heating said temperature responsive means;
a second system portion located at said second location including control means for said heat source and a temperature control means for controlling the temperature at said first location;
and
steering circuitry means for receiving said time varying electrical energy and for connecting said heat source control means to said heat source and said temperature responsive means to said temperature control means only through said two conductors, said steering circuitry means providing a first time period of said time varying electrical energy exclusively to said heat source control means and said heat source and a second time period of said time varying electrical energy exclusively to said temperature control means and said temperature responsive means for providing independent control of said heat source by said heat source control means and said temperature control means by said temperature responsive means.

1 more element

a first system portion located at said first location including temperature responsive means for responding to the temperature at said first location and a heat source in heat transfer relationship with said temperature responsive means for heating said temperature responsive means;
a second system portion including control means for said heat source and a temperature control means for controlling the temperature at said first location;
and steering circuitry means for receiving said time varying electrical energy and for connecting said heat source control means to said heat source and said temperature responsive means to said temperature control means through said two conductors, said steering circuitry means including current directing means for directing current in one direction through said heat source control means and said heat source and for directing current in the other direction through said temperature control means and said temperature responsive means for providing independent control of said heat source by said heat source control means and said temperature control means by said temperature responsive means, said current directing means causing current in said one direction to bypass said temperature control means and said temperature responsive means and current in said other direction to bypass said heat source control means and said heat source.

a first system portion located at said first location including temperature responsive means for responding to the temperature at said first location for providing control of temperature at said first location at a first temperature level and additional means for providing control of temperature at said first location at a second temperature level;
a second system portion at said second location for controlling the temperature at said first location;
and steering circuitry means for receiving said time varying electrical energy and for connecting said temperature responsive means and said additional means to said second system portion through said two conductors, said steering circuitry means including directing means for directing current in one direction through said temperature responsive means and said second system portion and for directing current in the other direction through said additional means and said second system portion for providing independent control of said temperature at said first location by said temperature responsive means and said additional means through said second system portion, said directing means causing current in said one direction to bypass said additional means and current in said other direction to bypass said temperature responsive means.

Dependencies are inferred from the claim text.

Temperature control system

Life of this patent

Temperature control system

Life of this patent

Abstract

Claims19