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Energy efficient electronic control system for air-conditioning and heat pump systems

  • US 4,941,325 A
  • Filed: 09/06/1989
  • Issued: 07/17/1990
  • Est. Priority Date: 09/06/1989
  • Status: Expired due to Fees
First Claim
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1. In conventional air-conditioning and heat pump systems normally including a compressor means, a compressor motor for operating said compressor means, a compressor contactor for turning said compressor motor on and off, an evaporator means, a conditioned air delivery blower fan, a blower fan motor for driving said blower fan, a blower relay for turning said blower fan motor on and off, a condenser means, a condenser fan, a condenser fan motor for driving said condenser fan, a condenser fan relay for turning said condenser fan motor on and off, a control transformer for converting sixty-cycle AC line voltage to control voltage AC power, an air duct system for delivering conditioned air and returning spent air from an area to be conditioned or controlled, a thermostat for automatic temperature control, and an improved energy efficient control system comprising:

  • first circuit means responsive to said thermostat indicating a need for conditioned air for initially energizing said condenser fan relay to turn on said condenser fan motor and drive said condenser fan for pre-cooling said condenser means and for preventing a high pressure or high stress compressor start-up;

    second circuit means responsive to the elapse of a first predetermined period of time after the initiation of said pre-cooling of said condenser for energizing said compressor contactor to start said compressor motor for pre-cooling said evaporator, and a portion of the air in said duct system, for preventing a reverse temperature gain, for shortening the air production or "on" cycle time, and for providing protection for the compressor and the compressor motor;

    third circuit means responsive to the elapse of second predetermined period of time after said first predetermined period of time for energizing said blower fan relay for driving said blower fan and supplying conditioned air to the area to be conditioned via said air duct system so as to initially deliver a built-up volume of conditioned air while providing additional protection for the blower fan and blower motor; and

    fourth circuit means responsive to a third predetermined period of time after said first and second predetermined periods of time and after said condenser motor and said compressor motor cycles off in response to a signal from said thermostat indicating that the user-selected temperature has been attained, for maintaining said blower fan on until substantially all conditioned air remaining in said ductwork system and said evaporator has been delivered and for turning said blower fan motor off at the expiration of said third predetermined period of time.

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