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Apparatus and method for providing low refrigerant charge detection

  • US 5,481,884 A
  • Filed: 08/29/1994
  • Issued: 01/09/1996
  • Est. Priority Date: 08/29/1994
  • Status: Expired due to Term
First Claim
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1. An apparatus for providing low refrigerant charge detection in a refrigeration system charged with a refrigerant and having a compressor with an inlet for receiving the refrigerant, the apparatus comprising:

  • means for sensing one of an operating and a non-operating states of the compressor;

    means for measuring refrigerant pressure at the inlet of the compressor;

    means for measuring ambient air temperature; and

    means for indicating very low refrigerant charge not detected when(i) the compressor is sensed in the non-operating state, and(ii) the measured refrigerant pressure is greater than a pressure value that is a predetermined function of the measured ambient air temperature.

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