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Air conditioning and heating environmental control sensing system

  • US 6,196,468 B1
  • Filed: 07/23/1999
  • Issued: 03/06/2001
  • Est. Priority Date: 07/24/1998
  • Status: Expired due to Fees
First Claim
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1. A device for controlling an air conditioner having an evaporator fan and a compressor for a room having a door and at least one window, comprising:

  • a door/window sensor operatively connected to each of said door and windows to sense whether any of said door and window is open;

    a fan relay operatively connected to said evaporator fan to activate said fan when said fan relay is activated, and to deactivate said fan when said fan relay is deactivated;

    a compressor relay operatively connected to said compressor to activate said compressor when said compressor relay is activated, and to deactivate said compressor when said compressor relay is deactivated;

    a system timer operatively connected to said door/window sensor, to said fan relay, and to said compressor relay, to deactivate said fan relay and said compressor relay a shutoff delay after said door/window sensor senses that any of said door and windows has been opened, and to maintain said fan and said compressor activated if said open door or window is closed within less than said shutoff delay after being opened, wherein said shutoff delay can be preselected by setting said system timer;

    a compressor timer operatively connected to said system timer and to said compressor relay to delay any reactivation of said compressor relay for a startup delay after said compressor relay has been deactivated, wherein said startup delay can be preselected by setting said compressor timer;

    whereby if said open door or window is closed less than said shutoff delay after being opened, said system timer prevents deactivation of said fan relay and of said compressor relay;

    whereby if said open door or window is closed a time between said shutoff delay and said startup delay after being opened, said compressor timer delays reactivation of said compressor relay until shutoff delay and said startup delay have both expired; and

    whereby if said door and windows are closed a time exceeding said shutoff delays and said startup delay after being opened, said fan relay and said compressor relay are reactivated immediately after said open door or window is closed.

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