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System and method for controlling at least one fan and a compressor

  • US 9,927,138 B2
  • Filed: 11/16/2015
  • Issued: 03/27/2018
  • Est. Priority Date: 08/12/2009
  • Status: Active Grant
First Claim
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1. A control system comprising:

  • an electronic controller in communication with one or more fans and with a compressor;

    wherein at least one fan of the fans selectively draws air from an exterior area having exterior air into an interior area having interior air, andwherein the compressor helps selectively cool air circulated by at least one of the fans;

    a control interface having a user selectable non-AC set point input and a separate user selectable AC set point input, the control interface in communication with the electronic controller and providing a user selected non-AC set point and a user selected AC set point to the controller, wherein the user selected AC set point indicates a higher dry bulb temperature than the user selected non-AC set point, and wherein the user selected non-AC set point is based on user interaction with the non-AC set point input and the user selected AC set point is based on user interaction with the AC set point input;

    an indoor sensor located to be responsive to at least two characteristics of the interior air, the indoor sensor in communication with the electronic controller and communicating, to the electronic controller, indoor air data that is indicative of the two characteristics of the interior air;

    an outdoor sensor located to be responsive to at least two characteristics of the exterior air, the outdoor sensor in communication with the electronic controller and communicating, to the electronic controller, exterior air data indicative of the two characteristics of the exterior air;

    wherein the electronic controller is operable in at least a first mode, wherein in the first mode the electronic controller causes, in conjunction with the compressor being inactive, the intake fan to be activated and exterior air to be communicated from the exterior area into the interior area when;

    the interior air data indicates a dry bulb temperature of the interior air is greater than the non-AC set point,the exterior air data indicates a dry bulb temperature of the exterior air is less than the dry bulb temperature of the interior air, andthe exterior air data indicates a dew point of the exterior air is less than a dew point of the interior air;

    wherein in the first mode the electronic controller further causes the compressor to be active and cool the interior air circulated by at least one of the fans when the interior air data indicates a dry bulb temperature of the interior air is greater than the AC set point and at least one of the following two conditions is met;

    the exterior air data indicates a dry bulb temperature of the exterior air is greater than the dry bulb temperature of the interior air indicated by the interior air data, andthe exterior air data indicates a dew point of the exterior air is greater than a dew point of the interior air indicated by the interior air data.

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