A method of replacing the lubricating product for the conversion of existing refrigeration systems to refrigerants without action on atmospheric ozone.

摘要

P A method for replacing at least one CFC lubricant, compatible with chlorofluorocarbon refrigerants, with at least one lubricant known as HFC compatible with hydrofluorocarbon refrigerants, before replacing the CFC fluid with the HFC fluid in a system refrigeration, said method comprising several rinsing steps consisting in draining the lubricant present in the refrigeration circuit, then filling said circuit with a rinsing fluid, then homogenizing the residual CFC lubricant mixture with said rinsing fluid by starting the refrigeration system, and finally, optionally, to measure in the rinsing fluid the percentage of the lubricant to be removed, said method being characterized in that introduced in the first rinse, an intermediate fluid compatible with the CFC fluid, able to solubilize the CFC lubricant and itself soluble in the HFC lubricant, that in at a later stage, the HFC lubricant is substituted for the intermediate fluid, preferably when the content of the CFC lubricant in the intermediate fluid is less than or equal to 15%, and the rinsings are stopped by the HFC lubricant when the content of the intermediate fluid in the HFC lubricant is less than or equal to 5%. / P