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When replacing R-22 by Forane® 427A, does the systems original oil need changing?

April 26, 2017changing forane® Oil original r-22 replacing system

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When replacing R-22 by Forane® 427A, does the systems original oil need changing?

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Forane® 427A is a 100% HFC blend and consequently requires the use of PolyOlEster (POE) lubricants to ensure proper oil return. As a consequence, when replacing R-22 with Forane® 427A, it is advisable to replace the original oil in the system (mineral or alkylbenzene) with a POE lubricant. Forane® 427A has been proven to work with 100% mineral oil systems which employ oil separators, but Arkema recommends an oil flush (see#13) for long-term system sustainability and enhanced performance. Many of the so-called no-oil change HFC R-22 replacement refrigerants on the market contain small traces of hydrocarbons which allow for some miscibility with mineral oil, but when compared to R-22 miscibility with mineral oil, they are very similar to Forane® 427A.