System Flushing

Now that CFCs cannot legally be vented to the atmosphere, flushing compounds such as R11 and R113 are no longer viable for flushing systems. To flush oil out of an R12 system when retrofitting for RI34a, you can use a recycling machine and liquid R12, which picks up the mineral oil used with R12 and takes it out. Do not use flammable solvents like mineral spirits or lacquer thinners. They are fire and explosion hazards.