R-12 to R-134 conversion - ZR-1 Net Registry Forums

Matt B · 07-13-2021

Sorry, I have to dig this out once more as I'm close to my plenum pull and will do the r134 conversion then.

Question is about oil and I still haven't (but might have overlooked) found a sufficient answer. How and to which extent (!) the old mineral oil has to be removed? It can't be simply flushed with r134...

I'm asking because particularly the above mentioned PAG oil is to my knowledge not compatible with older mineral oils. The alternative would be PAO 68 which can be mixed with minerals, but it's PAG that is explicitly mentioned.

So are there any efforts recommended by the bulletin to remove the old oil other than draining what's in the compressor and replacing the dryer?

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07-13-2021	#14
Matt B Join Date: Jan 2021 Location: Beautiful Bavaria Posts: 523	Re: R-12 to R-134 conversion Sorry, I have to dig this out once more as I'm close to my plenum pull and will do the r134 conversion then. Question is about oil and I still haven't (but might have overlooked) found a sufficient answer. How and to which extent (!) the old mineral oil has to be removed? It can't be simply flushed with r134... I'm asking because particularly the above mentioned PAG oil is to my knowledge not compatible with older mineral oils. The alternative would be PAO 68 which can be mixed with minerals, but it's PAG that is explicitly mentioned. So are there any efforts recommended by the bulletin to remove the old oil other than draining what's in the compressor and replacing the dryer? Sent from my SM-G991B using ZR-1 Net Registry mobile app __________________ ZR-1 #638/1991