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Refrigerant charging system and control system therefor

  • US 5,231,841 A
  • Filed: 12/19/1991
  • Issued: 08/03/1993
  • Est. Priority Date: 12/19/1991
  • Status: Expired due to Fees
First Claim
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1. An apparatus for charging refrigerant into a refrigerant system, comprising:

  • (a) a constant flow valve having an inlet for coupling to a source of refrigerant and an outlet port for coupling to an inlet of a refrigerant system;

    (b) means coupled to the outlet of the constant flow valve for determining the pressure at the inlet of the refrigerant system when the outlet of the constant flow valve is coupled thereto;

    (c) means for determining the density of the refrigerant being charged into the refrigerant system from the pressure determined at the inlet of the refrigerant system;

    (d) means for determining the volume of refrigerant that has flowed through the constant flow valve;

    (e) means for determining the mass of refrigerant charged into the refrigerant system based upon the volume of refrigerant that has flowed through the constant flow valve and the determined density of the refrigerant.

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