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Active low temperature limit for battery powered thermostat

  • US 5,226,591 A
  • Filed: 11/19/1992
  • Issued: 07/13/1993
  • Est. Priority Date: 11/19/1992
  • Status: Expired due to Term
First Claim
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1. A low temperature limit switch for a battery powered thermostat for energizing and de-energizing a heating system, said thermostat comprising:

  • a) a battery powered thermostat control for energizing and de-energizing a said heating system; and

    b) a low temperature limit electrically connected in parallel with said battery powered thermostat control, said battery powered thermostat control disabling said low temperature limit when said battery is charged, said battery powered thermostat control enabling said low temperature limit when said battery is discharged, whereby when said battery is discharged said low temperature limit energizes said heating system when the ambient temperature present on said thermostat is below a pre-selected temperature.

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