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Programmable timer mechanism

  • US 3,929,284 A
  • Filed: 07/25/1974
  • Issued: 12/30/1975
  • Est. Priority Date: 07/25/1974
  • Status: Expired due to Term
First Claim
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1. A dual temperature control system for controlling the temperature of a zone comprising:

  • a. first and second zone thermostats;

    b. a first programmable means for determining the time said first and second thermostats are effective to control temperature of said zone;

    c. a second programmable means for determining the time said first and second thermostats are effective to control temperature;

    d. means for automatically selecting which of said first and second programmable means determines when said thermostats are effective to control temperature; and

    e. means for manually selecting one of said first and second programmable means to determine when said thermostats are effective to control temperature.

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