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Timer controlled high and low temperature thermostat

  • US 3,917,165 A
  • Filed: 02/19/1974
  • Issued: 11/04/1975
  • Est. Priority Date: 02/19/1974
  • Status: Expired due to Term
First Claim
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1. A control device for supply of energy to a heating unit which is adapted to heat a space, comprising:

  • a low heat thermostat responsive to a lower range of temperatures within said space, and a high heat thermostat responsive to a higher range of temperatures within said space, a control unit for controlling flow of heat-producing energy from a source to said heating unit, switch means for selectively placing said control unit under the influence of said low heat thermostat or said high heat thermostat, timer means for controlling operation of said switch means, said thermostats, said control unit and said switch means being wired in an electrical circuit, said switch means comprising a relay having a coil and an electrical switch operated by energization of said coil, and a manually operable electric switch in said electrical circuit between said timer means and said relay, whereby manual operation of such switch interrupts flow of current to said relay without stopping operation of said timer means.

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