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MULTI-STAGE CONTROL FOR ELECTROMECHANICAL HEATING, VENTILATION, AND AIR CONDITIONING (HVAC) UNIT

  • US 20170030623A1
  • Filed: 08/01/2016
  • Published: 02/02/2017
  • Est. Priority Date: 07/31/2015
  • Status: Active Grant
First Claim
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1. A control system for a heat transfer circuit, comprising:

  • a thermostat having a first cooling level signal output terminal and a second cooling level signal output terminal;

    a controller electrically connected to the thermostat;

    a sensor electrically connected to the controller; and

    a switch electrically connected to the controller, and that receives a first cooling level signal output from the thermostat, wherein the switch is in a first state when a sensor value from the sensor is less than a threshold, and a second state when the sensor value from the sensor is greater than or equal to the threshold, andwherein the first cooling level signal output enables a first cooling stage or a second cooling stage and a second cooling level signal output enables a third cooling stage.

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