Moderators: Greenleaf, BC847, Richie O
Cburb wrote:R12 uses mineral oil r134 uses PAG...they are not miscible with eachother, which means they will be separated and very very little lubrication will be occurring. not to mention just very small amounts of r12 in a system will raise the head pressure higher than it should be with 134.
The 134 with mineral oil wont circulate like it should and will just migrate to low spots and sit, very hard on the compressors since the oil isnt going to be flowing with the refrigerant.
You really should recover everything, change filter drier then at least remove compressor and drain old mineral oil and add some pag, then blow the lines with nitrogen, pull into a deep micron vacuum and you should be set. Could change o rings while your at it and youll have a solid system. Otherwise you are just rolling the dice and not going to have a properly working system and wont last as long as it could.
If you dont feel like doing that then just get some 414b hotshot and charge with that, at 80% of the factory charge, its compatible with mineral and works fine.
I really dont care if people have done this with no problems, you cant argue science its still not right but some compressors are tougher then others. It could run fine for a while, then again maybe not. At a minimum it will definitely not last as long as it could and wont be as efficient either.
BC847 wrote:Cburb wrote:R12 uses mineral oil r134 uses PAG...they are not miscible with eachother, which means they will be separated and very very little lubrication will be occurring. not to mention just very small amounts of r12 in a system will raise the head pressure higher than it should be with 134.
The 134 with mineral oil wont circulate like it should and will just migrate to low spots and sit, very hard on the compressors since the oil isnt going to be flowing with the refrigerant.
You really should recover everything, change filter drier then at least remove compressor and drain old mineral oil and add some pag, then blow the lines with nitrogen, pull into a deep micron vacuum and you should be set. Could change o rings while your at it and youll have a solid system. Otherwise you are just rolling the dice and not going to have a properly working system and wont last as long as it could.
If you dont feel like doing that then just get some 414b hotshot and charge with that, at 80% of the factory charge, its compatible with mineral and works fine.
I really dont care if people have done this with no problems, you cant argue science its still not right but some compressors are tougher then others. It could run fine for a while, then again maybe not. At a minimum it will definitely not last as long as it could and wont be as efficient either.
It's a pleasure to read professional derived advice.
He could skip replacing the mineral oil and charge it with R290.
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