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Automatic room occupancy controlled fuel savings system for air conditioning/heater units

  • US 5,538,181 A
  • Filed: 05/02/1995
  • Issued: 07/23/1996
  • Est. Priority Date: 05/02/1995
  • Status: Expired due to Fees
First Claim
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1. An automatic electrically powered thermostatless occupancy controlled power savings system for retrofit with a temperature controlled room system having an in-room thermostatic control unit for automatic control of room temperature, wherein said temperature controlled room systems are operated from a power line source within a room being temperature controlled, comprising in combination:

  • an electrically powered wide angle motion detector adapted to detect motion of an occupant within a substantial portion of a room in which one of said room systems is installed,time delay means responsive to said motion detector for producing a signal representative of lack of room occupancy for a predetermined time period, andswitching means for controlling power from said power line source to said temperature controlled room system in response to the time delay means signal,said power savings system thereby constituting in combination a substantially self contained unit for retrofit installation by connection between said power line and said room system to supply power to the room system wherein said time delay means further comprises an auxiliary timing system for providing a standby mode of operation with the unit connected to the power line for controlling said switching means to produce a predetermined off-on duty cycle time for the temperature control room system during unoccupancy of the room.

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