Re: High quality refrigerants??

Posted by Bob on July 20, 2005 at 17:03:46 from (64.21.249.40):

In Reply to: High quality refrigerants?? posted by Hurst on July 20, 2005 at 16:39:30:

What oil was put in the system when it was coverted? If there is ever a reason to add more oil, the same oil should be used.

Mineral oil... original oil for R-12 use.

PAG oil... for systems that have been R-134 since new, or systems that have been THOUGHLY flushed to get rid of ALL traces of mineral oil, and the compressor and dryer have been replaced.

Polyol Ester oil... for converted systems in which 80%+ of the old mineral oil has been removed.

If you inadvertantly mix mineral oil, PAG oil, and POE oil in a system, likely you will wind up with a system full of a substance with properties next to Jello, and no cooling.

That is why it is important go by official guidlines for conversions, change the service ports to R-134 service ports, and put a conversion sticker on the system listing what refrigerant and oil have been installed.

As far as dye is concerned, since oil is always circulating in the system, with the refrigerant, MOST leaks become apparent as an oily area with dirt stuck to it.

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