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Remote control of an HVAC system that uses a common temperature setpoint for both heat and cool modes

  • US 9,816,719 B2
  • Filed: 01/14/2015
  • Issued: 11/14/2017
  • Est. Priority Date: 09/21/2010
  • Status: Active Grant
First Claim
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1. A method for controlling a mini-split system HVAC unit via a thermostat that is located remotely from the HVAC unit, the HVAC unit having a cooling mode and a heating mode for conditioning air in the inside space, the HVAC unit having a temperature sensor for providing a locally sensed air temperature and an onboard controller that is configured to activate and deactivate the HVAC unit so as to conditioning the air in the inside space in accordance with a control setpoint of the onboard controller, the onboard controller of the HVAC unit is further configured to accept input signals wirelessly transmitted from the remotely located thermostat, the method comprising:

  • the remotely located thermostat comparing a sensed temperature in the inside space with a setpoint, and determining if the sensed temperature is different from the setpoint by at least a predetermined amount; and

    if the sensed temperature is different from the setpoint by at least the predetermined amount, the thermostat wirelessly sending one or more input signals to the onboard controller of the HVAC unit, the one or more input signals instructing the onboard controller of the HVAC unit to set the HVAC unit to a particular one of the cooling mode and the heating mode, and to set the control setpoint of the onboard controller to a value that will cause the onboard controller to activate the HVAC unit in the particular one of the cooling mode and the heating mode.

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