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A/C Recovery and HFO-1234yf
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djhughes
User
Jun 16, 2012, 10:53 AM
Post #1 of 11
(3379 views)
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A/C Recovery and HFO-1234yf
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Im a new guy here and have just started to get into the HVAC systems. This question is just in general to all automotive A/C systems. When you recover the refrigerant from a system does the oil come out with it?? I would also like to ask what you kind folks think about the new HFO-1234yf refrigerant that will start showing up soon (2015 I think). Has anyone had to deal with that yet?? Thanks
By the way my name is David, Im a full time automotive student, have class at night and work during the days, A4 and A5 certified.
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Discretesignals
Ultimate Carjunky
/ Moderator
Jun 16, 2012, 11:46 AM
Post #2 of 11
(3353 views)
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Re: A/C Recovery and HFO-1234yf
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When you recover refrigerant yes, some oil comes out. Most recovery machines have a measurement container that the machine purges the recovered oil into, so you can see how much came out. You just put back in the same amount when you go to recharge.
Haven't played around with the HFO yet, I haven't even seen any HFO recovery machines for sale yet. I'm sure it won't be long once production of the refrigerant increases and more vehicles come out with it. It might take years before it trickles down to the independents. I'll have to ask a tech buddy that works on Cadillac to see if they had an experiences yet.
I just hope and pray that they make the HFO and R-134A illegal to sell to someone without a 609 certification.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 16, 2012, 11:46 AM
Post #3 of 11
(3350 views)
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Re: A/C Recovery and HFO-1234yf
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You never know how much oil will come out with the refrigerant. Usually, the faster it discharges, the more oil it takes with it. You're suppose to drain the oil from the recover machine after recovering to measure how much came out.
It's too soon for anyone to have seen any R1234yf yet.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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djhughes
User
Jun 16, 2012, 3:50 PM
Post #7 of 11
(3297 views)
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Re: A/C Recovery and HFO-1234yf
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Hey, thanks folks for the input. I look forward to reading more post and asking more questions soon.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jun 16, 2012, 5:01 PM
Post #8 of 11
(3285 views)
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Re: A/C Recovery and HFO-1234yf
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This thread for reading is still worth it for R-12 and 134a. Can't wait to see what the hell the new gasses behavior will be like. Yes I can wait and think it's all just stupid politics and expiring patents which in retrospect seems to be what happened to R-12. It's locked up top in this section...........
http://autoforums.carjunky.com/..._A/C_SYSTEMS_P45460/
The discussion has been going on for quite a while. Europe was really going to go CO2 but the pressures are insanely high to condense it so that didn't take.
152a - what many computer dusters use was high on the list of contenders.
Learn the properties and snags that no doubt will come up with that too.
Good luck with the ASE cert,
Tom
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nickwarner
Veteran
/ Moderator
Jun 18, 2012, 5:46 PM
Post #9 of 11
(3229 views)
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Re: A/C Recovery and HFO-1234yf
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The sad thing is the guys in the backwoods of Mexico use the most efficient refrigerant in cars, propane. Its boiling point is -32F putting it ahead of R-12 even! But the obvious problem of car going boom exists should you ever have a leak. I'm sure Sidom has a combustible gas detector at work as he's in SoCal and those do come by. But they do have lower cycle times and pressures. Most efficient thing out there just flammable as hell.
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Discretesignals
Ultimate Carjunky
/ Moderator
Jun 18, 2012, 6:08 PM
Post #10 of 11
(3222 views)
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Re: A/C Recovery and HFO-1234yf
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Well, if you use propane as a refrigerant, why not put it to good use when you get a leak?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Sidom
Veteran
/ Moderator
Jun 18, 2012, 6:13 PM
Post #11 of 11
(3219 views)
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Re: A/C Recovery and HFO-1234yf
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Well we could debate the R12, propane, R134a thing. But it will come down to what works good for you.....Personally I think R12 was about the most efficient refrigerant. I don't think 134 is as bad as replacement as it 1st made out to be. I've worked on a bunch of 134 systems that get very cold. Ones I can get blowing 38° out the vents.....Much more than that & you' freeze up the evap.
Anyone that is using a recovery machine really needs to be using refrigerant a detector. Whether you're looking for different refrigerants or if the system has sealer in it........Most sealers will trash your recovery machine. As far as refrigerants go, if you are recovering R134, which is probably the most common, all it takes is 1 R12, propane, etc system and you have just contaminated your whole tank making it useless. Personally I don't like using recycled on new systems and will use virgin when ever I can but.....Sometimes you have no choice & gotta do what you are told to do.......
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