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Multi-mode auto changeover system

  • US 9,551,501 B2
  • Filed: 03/15/2013
  • Issued: 01/24/2017
  • Est. Priority Date: 03/15/2013
  • Status: Active Grant
First Claim
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1. A thermostat device for a heating, ventilation and air conditioning system of a building, comprising:

  • a user interface; and

    an auto changeover connected to the user interface, for switching from one mode to another mode according to the temperature of the space at a set amount of time relative to a time a temperature controlled space reaches a cool setpoint or heat setpoint, and having adjustable hystereses above and below the cool and heat setpoints, respectively; and

    an emergency heat component having a button to activate emergency heat;

    wherein;

    the user interface displays a mode of the thermostat and automatically indicates a heat or cool mode that is in effect;

    the auto changeover is always allowed; and

    the auto changeover can be manually deactivated and activated;

    when the emergency heat is activated, a system switch automatically changes the thermostat to heat and the auto changeover is automatically deactivated;

    when the auto changeover is activated, the emergency heat is deactivated; and

    when the system switch is changed to cool or off, the emergency heat is automatically deactivated.

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