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Tool Talk Discussion Forum

O/T Flushing an air conditioner compressor

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Ebbsspeed

11-09-2005 16:24:38




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I"m getting ready to install an air conditioning system in my 1956 New Yorker. I bought a Sanden 510 compressor, new in the box, that is charged with oil for R-12 refrigerant. I will be using R-134 in the system, so will have to flush the oil out of the compressor and replace it with R-134 compatible. Question is, can I just do this on the bench, fill the compressor with the flush stuff, turn it over by hand and then drain it. Any info would be appreciated. Thanks!

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Bob

11-10-2005 14:33:13




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 Re: O/T Flushing an air conditioner compressor in reply to Ebbsspeed, 11-09-2005 16:24:38  
Position the compressor so as to drain as much as possible of the mineral oil out. Give it time to drip out.

Then, use POLYOL ESTER oil.

Do not even think of using PAG oil in a system with ANY TRACE of mineral oil left in it, as the result will be s gooey, gelatin-like mess.

Another option is to leave the mineral oil in the system, and use a retrofit refrigerant, such as Freeze-12. Freeze 12 is a blend of 80% R-134 with other fluorocarbon refrigerants, and will work will the original refrigerant oil. Ir cools very well.

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Hobo,NC

11-10-2005 05:01:06




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 Re: O/T Flushing an air conditioner compressor in reply to Ebbsspeed, 11-09-2005 16:24:38  
bradk, izz correct I have used ester oil fer years with no problem with 134



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bradk

11-09-2005 18:40:57




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 Re: O/T Flushing an air conditioner compressor in reply to Ebbsspeed, 11-09-2005 16:24:38  
I wouldn't use flush solvent in a compressor!You'll never get it all back out.Just dump out the oil that's in it & measure it.Replace that amount (plus 2 more oz.) w/ester oil which is compatable with R12 and R134a.~brad



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lucasss

11-10-2005 06:55:19




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 Re: O/T Flushing an air conditioner compressor in reply to bradk, 11-09-2005 18:40:57  
i thought pag oil is what works best in r134 apps.. lucas



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thejdman01

11-10-2005 15:50:03




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 Re: O/T Flushing an air conditioner compressor in reply to lucasss, 11-10-2005 06:55:19  
use ester oil. i was taught ester is a womens name think of it as ester being a s**t she gets alone with everyone. use ester when donig conversions etc she gets along w/everyone wont give you illeffects if every drop of oil or refrigerant dont get out



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bradk

11-10-2005 09:56:38




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 Re: O/T Flushing an air conditioner compressor in reply to lucasss, 11-10-2005 06:55:19  
If the system always had R134a,it should have pag oil.Systems that have been retro-fitted,or in this case a compressor pre-filled w/mineral oil,ester is the recommended oil.Pag oil doesn't mix well with others.~brad



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