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Originally Posted by Zeitgeist
...I thought that older appliances used either R-11 or R-22.
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They used to use R12 but have switched to R134a. Really old refigerators used R717 (ammonia) and R764 (sulphur dioxide). Some commercial equipment uses R502 but I've never heard of a refigeration (like a refrigerator or freezer) system using R11 or R22.