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Refrigerant charge status indication method and device

  • US 7,610,765 B2
  • Filed: 12/27/2004
  • Issued: 11/03/2009
  • Est. Priority Date: 12/27/2004
  • Status: Expired due to Fees
First Claim
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1. A method of determining the sufficiency of refrigerant charge in an air conditioning system having a compressor, a condenser coil, an expansion device and an evaporator coil connected in serial refrigerant flow relationship, comprising the steps of:

  • sensing the temperature of the refrigerant leaving the condenser coil and generating a first electrical signal representative thereof;

    sensing the outdoor temperature and generating a second electrical signal representative thereof;

    converting said first and second electrical signals to first and second digital values; and

    comparing said first and second digital values to obtain an approach temperature difference; and

    comparing said approach temperature difference with predetermined optimal values to determine whether a proper refrigerant charge condition exists.

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