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Setback control for HVAC system

  • US 5,363,904 A
  • Filed: 07/30/1993
  • Issued: 11/15/1994
  • Est. Priority Date: 07/30/1993
  • Status: Expired due to Term
First Claim
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1. A system for controlling the temperature of an interior space, said system including a setpoint temperature control comprising:

  • a clock timer for clocking a predetermined period of time which must elapse;

    triggering logic for triggering said clock timer to begin the clocking of the predetermined period;

    a counter for counting the number of times the predetermined period of time has elapsed;

    temperature changing logic for changing the current setpoint temperature by a predefined amount each time a change occurs in the count of the number of times the predetermined period of time has elapsed; and

    logic for suspending said temperature changing logic from changing the current setpoint temperature by a predetermined amount when the count of the number of times the predetermined period of time has elapsed reaches a predetermined number.

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