How to extract and then add new refrigerant oil to a home hvac system after existing oil was contaminated with humidity?

by angel rojas   Last Updated September 11, 2019 16:21 PM

Condenser copper refrigerant lines were cut by vandals. They stayed open for several days. Before recharching with r-22, i know the repairmen will have to braze the copper lines and remove all the old oil because it was exposed to the ambient and oil absorbs water from the humidity of the air. Im gonna be watching the repairmen closely and want to know about the right way so i will have an educated opinion and be able to question the procedures. How should they purge the old oil? How to add new oil, as i understand the r-22 refrigerant (freon) does not come with oil mixed in?

Tags : hvac

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