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System and method for controlling a fan unit

  • US 9,188,352 B2
  • Filed: 08/12/2010
  • Issued: 11/17/2015
  • Est. Priority Date: 08/12/2009
  • Status: Active Grant
First Claim
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1. A control system for a fan unit, the fan unit having a fan for selectively drawing air from an exterior area having exterior air into an interior area having interior air, comprising:

  • an electronic controller in electrical communication with said fan;

    a control panel having a user selectable set point input, said set point input in electrical communication with said electronic controller and providing a user selected set point to said electronic controller;

    an indoor sensor located so as to be responsive to at least two characteristics of said interior air, said indoor sensor in electrical communication with said electronic controller and communicating indoor air data indicative of said at least two characteristics of said interior air to said electronic controller;

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

    wherein said fan unit is operable in an automatic mode, wherein in said automatic mode said electronic controller causes said fan to be activated and exterior air to be communicated from said exterior area into said interior area when;

    said interior air data indicates a dry bulb temperature of said interior air is greater than said set point,said exterior air data indicates a dry bulb temperature of said exterior air is less than said dry bulb temperature of said interior air, andsaid exterior air data indicates a dew point of said exterior air is less than a dew point of said interior air as indicated by said interior air data; and

    wherein in said automatic mode said electronic controller prevents said fan from being activated and exterior air from being communicated from said exterior area into said interior area without concurrent activation of a compressor when any of the following conditions is met;

    said interior air data does not indicate said dry bulb temperature of said interior air is greater than said set point,said exterior air data does not indicate said dry bulb temperature of said exterior air is less than said dry bulb temperature of said interior air, orsaid exterior air data does not indicate said dew point of said exterior air is less than said dew point of said interior air as indicated by said interior air data.

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