Flushing of heating, ventilating and air conditioning systems using environmentally safe materials

  • US 5,174,906 A
  • Filed: 09/27/1991
  • Issued: 12/29/1992
  • Est. Priority Date: 09/27/1991
  • Status: Expired due to Term
First Claim
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1. The process of flushing refrigerant from heating, ventilating and air conditioning systems that employ Freon, hydrofluorocarbon or hydrofluorochlorocarbon as a refrigerant, comprising the steps of:

  • preparing a solvent consisting of a mixture of materials selected from the terpene hydrocarbon group and the terpene alcohol group;

    placing the solvent mixture in the reservoir of a recirculating pump;

    connecting an output of said pump to an input of a system to be flushed;

    connecting an output of said system to said recirculating pump reservoir;

    operating said pump for a predetermined period of time;

    circulating the solvent through said system to cleanse said system;

    terminating operation of said pump;

    draining all the solvent and refrigerant and other materials contained within said system into said reservoir;

    blowing air through said system to evaporate any of said solvent remaining in said system.

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