difference between r12 and r134a expansion valve

B. System has been working fine for a year. don't know enough about the subject to explain the choices.However, a few days ago I called the dealer to see about an OEM TEV and they said something that made me feel a little bit better; the same part number superceded every application back to the '60s, and that they couldn't do that without engineering signing off on it.Still, I would feel a lot better if I could see something written officially that compared the flow characteristics and performance of r12 and 134a TEVs are concluded that they were interchangeable in automotive applications.If someone knows of such a document I would sleep much better!Walt Edited: Mon September 12, 2005 at 8:13 PM by wamcneil. Yes, the 50F diff (160-110F) on the condenser was at idle, and ambient was about 90F. 10,000BTU conduction heating? Hopefully after you have read this entire page you will have enough information to determine which type of refrigerant is best for you. A final difference is that most (though not all) R-1234yf cars will have a Suction Line Heat Exchanger. Do I leave the orignal condensor in, etc?Thanks. The original rubber a/c hose lines in your car will leak out R12 through the hoses lining. Bookmarks: Digg; del . Is there a difference in the expansion valve for R12 as opposed to R-134a? If ambient is 90 (today) and the output of the condensor is 110, that's pretty good isn't it? Be sure to test @ 1500 to 2000 engine rpm, and record the ambient temp as well. The typical scenario here is when the car owner buys an inexpensive retro-fit kit from the local auto parts store. It has already been clearly stated that R12 is a chemical that damages the earths ozone layer and shouldnt be released into the environment no matter the circumstance. Instead, top off R12 with R134a refrigerant. It is made up of carbon, hydrogen, and fluorine. AC R12 to R134A Conversion | MR2 Owners Club Forum There are R134a specific valves that operate at a slightly different pressure, but not for any "old" automotive application that I'm aware of. Since 2010, all home AC systems manufactured use a refrigerant like R134a that has zero ozone depletion potential (ODP). The general practice of charging the system with 15% less refrigerant adds to the thermal deficiency of R134a. What is the refrigerant property involved that has caused this? You do not have to split up the 5-6 oz of oil and add it to each component, just simply put it all in the compressor as it will move throughout the whole system once the system is operational. Automotive Replacement Expansion Valves & Parts; Industrial & Scientific; Customer Reviews. R404a is a zeotropic blend with a temp glide , because of the mixture of 2 or more refrigerants. Warning: "continue" targeting switch is equivalent to "break".Did you mean to use "continue 2"? We mention using ester type refrigerant oil. This refers to BTU's (heat) moved per pound of refrigerant moved. difference between r12 and r134a expansion valve. The most common influences which effect the capability of R134a to perform well are the condenser, in some cases the the superheat setting of the expansion valve or the amount of R134a. Measure what you have now.3) Go back to the page in step one, and find the largest condensor you can put in your vehicle. Using R134a requires that Polyolester (POE) lubricant must be used in the compressor. A. Pressure/temperature plot of R134a vs. R12 is shown in figure 1. You can use the R134a retrofit capacity chart for this purpose. The primary function of the design engineer is to make things difficult for the fabricator and impossible for the serviceman. But as there's not a big difference, people say you can suffice with either. 1) Warm Air From Vents. difference between r12 and r134a expansion valve The P H and T cond,sat of the HR12 at a T oa of 40 C were higher than that of the R134a, resulting in a higher P e than that for the R134a. difference between r12 and r134a expansion valve . This allows the refrigerant in the condenser to be void of oil particles. When ever possible you should ask the technician to note the same information on your repair bill and keep a copy in your glove box for future reference. June 21, 2022 difference between r12 and r134a expansion valve . difference between r12 and r134a expansion valve bokoen1 hoi4 the great purge / meryl and maks dancing with the stars / difference between r12 and r134a expansion valve. Recomanem consultar les pgines web de Xarxa Catal per veure tota la nostra oferta. Then I'll put the ball valve in on the coolant and test it and see what we have. Quick View. Its not that difficult but the procedures of evacuation, charging and testing should be done by a licensed a/c technician that is experienced with R134a and your particular car. So, instead of using R12, other better options include R401b, R134a, R401a, etc. July 3, 2022July 3, 2022. So I probably put the highest suggested amount in to be safe. Amazon.com: 134a Valve In the automotive world, the replacement for R12 was R134a. R134a has the chemical formula CF3CH2F and is known as tetrafluoroethane. Operating Pressure/Temperature Differences The pressure/temperature curves for R-1234yf and R-134a are very similar. Unfortunately, the oil only mixes with the refrigerant as a liquid. It is common for eurocar threads to go multiple pages, and as Nick points out - sometimes cool is all you will ever get. Attach the R134a charge port adaptors, there are two types.. one of which you need to remove the old R12 valve cores. The current expansion valve is FF - 1/4 - C. Is it neccesary to replace this valve? Generally this works well for the whole system. R134a has an ozone depletion potential of 0, implying that it has a slight effect on the ozone layer. Hope this helps. When the sensor detects the refrigerant leak the sniffers lights glow and the sniffer makes a noise. Generally you follow the refrigerant flow moving from connection to connection, component to component, and you sniff the a/c vents to check for evaporator leaks as well. You can spend long evenings reading about the differences between the two refrigerants. Talk about what services you provide. 2) Frost on the Vents. Flush with a garden hose - do not use a high pressure washer - you can bend the fins flat & damage the condensor.B. You will be fine with a 134a-compatible TXV running R12. I'm having the same concern. how to get to disney springs from boardwalk / bb dakota plaid jacket canada / difference between r12 and r134a expansion valve. There are significant differences between R12, R134a, and R513A, which must be considered when handling, processing, applying, or retrofitting with these refrigerants. "Jerky Locker" LMAO I am using that one in the future!Florida = BUGS! I'm also thinking maybe I should go to R134 - it might work better with the right amount of oil and the correct expansion valve. Not osmosis, but you know what I mean). I've straightened the fans I can and sprayed simple green on it, let it soak then hosed it down well. Fitting a PF condensor is not rocket science, but it requires some planning. Compared with the cost-performance ratio, R507 is 30-40% . absorb by the evaporator to insure all liquid refrigerant entering the evaporator. R12 was once used in many air conditioning units as a refrigerant or cooling agent. They would then make short "jumper hoses" to connect to the existing stock hoses, refit your old fan if there is a "pusher" fan, and recharge to specs. J.Harris said: Or if you want to do it like they do in Mexico you can use propane, it's an excellent refrigerant but highly flammable. Even if the system leaks, repairing the leaks and recharging it with R-12 is usually the best repair alternative. This is due to many facts: R134a refrigerant is about 10% less efficient in moving heat than R12! The oil used in R12 systems is not compatible with R134a refrigerant. Generally, the new amount is 75-85% of the quantity advised by the manufacturer. As illustrated in the chart below, the curves below run together nearly throughout the curve, only slightly breaking paths at around 250 psig/150 degrees and above Flammability/Safety R-1234yf has been designated as MILDLY flammable. They can be mounted quite easy,and there is a mounting kit that helps to hang it. If there is no pusher fan, and you have the room, put one in. Maybe a jerky locker.I cleaned the condensor with the off the shelf ac cleaner stuff from Home Depot that I used on my home evaporator. Looks like a couple of things happening here1) 80's vintage Eurocars were not "meat lockers". A vacuum pump, a refrigerant recover system, quality service gauge set with both low and high side gagues, and much more besides the lessons to learn what to do and what not to do. R-12 vs R-134a Hose - Pelican Parts Forums Look deep into the fins. Thanks so much Bohica - you've save me many more hours of fruitless speculation. Ensure you contact a professional mechanic to do the work for you so you dont end up incurring more costs for yourself. Before R12 was replaced with R134a in 1995, it was mostly used in trucks and cars. The newer valves and switches will work with both refrigerants. The system has been previously converted to R-134a. ~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446. At the moment, the ac is acting up - will work fine for about 15 minutes and then slowly the vent temperatures rise until the compressor switches off. The butylcellusolve or the citrus solvent will dissolve the carcass in a few minutes. Also, R134a cylinders are light-blue in color. #4. To ensure the right charge, you must fill the new system with between 75 and 85% of the factory-set capacity for optimal cooling. R12 to R134a change expansion valve? - HVAC-Talk: Heating, Air It is possible I have 10 ounces (250 ml) in the system. At least you do not have 16 ounces in there ( yup seen it before).For now, straighten all of the fins that you can, clean the condensor well, and re-test with the aux fan running. We've updated our forums!Click here to visit the new forum, Year: 1991Make: Jaguar Model: XJ6Engine Size: 4.0. It is made up of carbon, hydrogen, and fluorine. R134a requires a different oil. Can I use the one for the R-12? Even with proper fan operation, missing seals & air dams can effect condensor effeciency. Debug the condensor (I am a computer nerd after all!)3. Some 1993 and older R12 systems aren't as 'compatible' as you'd think to switch over. Expansion Valves Catalog E-1, July 2012. That would be the "black death" syndrome. Gain access to our free AOP (Ask a Professional) Section to get real answers for your questions. 4) Inconsistent Airflow. You do not however need to replace all the o-rings or seals for a simple conversion, it is simply a logical thing to do when and if the time comes to work or replace certain components because of age issues. However, theyre still used in older plants, systems, and the automotive industry. I'm going to check the condensor is way clean too. And yes - expansion valves sometimes need replacing if they are sticky - but a proper AC flush should eliminate the need for a new one if it's already in good condition. How is the vent airflow?I would jumper the aux fan & check the performance. Yes, this was a smokers car. Pound for pound R134a is a more efficient refrigerant than R12, however it runs at higher pressures in some aspects and therefore requires more effective condensing. The chemical composition of R12 and R134a differ. I don't believe it is but I had a service guy tell me it needs to be done. However, the supply houses don't indicate a difference. With the A/c off hi and lo were both at 105psi. Make sure to wear safety gloves, goggles, and shoes when theres a possibility of exposure to the chemical (R134a). I don't have the FSM matrix handy for that 123.123, but a 123.133 shows a test rpm of 2,000 - and vent temps between 54f & 66f at 91f to 95f ambient. Agram a retevis rt22 password i bastrop county district clerk records el material que oferim als nostres webs. The aux fan seems to be working fine - it switches on occassionally. Consider using the newer valve, even with 134a stamped on the valve. Once you have replaced the OEM condensor with a PF unit, you will need to make custom hoses to mate with your OEM system. Stability: RR12 doesnt disintegrate even under extreme operating conditions. For instance you can evacuate FRIGC FR-12 into a refrigerant recovery bottle that has R134a in it or visa versa. All fans must work at 100% of the OEM rating. Paul:A 1983 240D should have a York compressor on an OEM system. in /nfs/c05/h04/mnt/113983/domains/toragrafix.com/html/wp-content . Is there more info needed?THanks -------------------------1983 Mercedes 240D on R12 and WVO!1192 Mercedes 300D 2.5 R134a1993 Toyota Pickup converted to R134a, Paul:I had to dig a bit deeper - MB made several running changes in the 1983 123'sThere are actually 4 different circuit diagrams for the A/C system that year - just for your 123.123 I found the R4 reference, and it should have 170 Ml of oil in the system.Your aux fan should run at the ambients you listed. I'm doing one thing at a time so I know what the cause was. Participate in over 40 different forums and search/browse from nearly 3 million posts. Flushed, vacuumed etc. difference between r12 and r134a expansion valve why is miles raney not on homestead rescue June 21, 2022. manila mayor candidates 2022 Use a strong surfactant like Simple Green or Zep Citrus, and soak the fins on the condensor. Usually, mechanics charge around $200 for conversion. In large application systems, the vapor density of this refrigerant is usually high. It is perhaps possible to locate a unit with a company that purchases close out or distressed merchandise. Very nice! Dimensioning of refrigeration components - part 2 - Danfoss We recently created this blog site to enable us to share our knowledge with other automotive mechanics and car owners. It may take a couple of tries to get things really clean.The laser is usually close on clean surfaces, but I prefer a T/C. Or is there always room for improvement, the more the merrier. At this time you can still find R12, but, because it is no longer produced, availability is limited to current inventories and the price per pound is greater than R134a. If you're getting a R134a compressor, might as well finish the job - replace the receiver/dryer, flush everything else, and convert to R134a anyhow. Super heats are so close, it should not be a major concern.-------------------------The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government. This can be very very expensive. R134a requires the use of synthetic oil! From memory, I put in at least 8 ounces of oil, probably around 10 ounces in there. difference between r12 and r134a expansion valve They might say for instance, add 3-4 oz of oil to the compressor, 1 oz of oil for when you replace a drier, 2 oz oil for the evaporator and so on. Expansion Valve for R134a? | Team Chevelle It cycles on off in med (or low for that matter)Gotta tell ya. Can I order a valve based on the original eaton number? It runs between the condenser outlet, receiver/drier unit and expansion valve at the firewall. (You must log in or sign up to reply here. Edited: Sat July 14, 2007 at 10:22 PM by fonebone. The non-flammables can have R22 type gas which is not compatible with most rubber hoses or they have gases that contribute to global warming. This drop can affect energy consumption since the plant will operate for a longer period or a larger plant will have to be installed. There is only a temperature switch on these cars as far as I recall, and it just switches on the aux fan. After the initial charge the system is then tweeked : you determine the optimum amount of refrigerant to match your system by monitoring the a/c outlet vent temperature and the high side pressure as you add or remove refrigerant. The bad thing is I don't know what to do about it. Does it matter - assuming both are new & uncontaminated? So the steps involved are cleaning out the old oil, replacing all the O-rings, replacing the dryer, replacing the expansion valve, and converting the high and low side connectors from Schrader to quick connect valves. At 40, it is 35psi, which is a difference of 8.9psi. Well, I'm not sure it is 'fine' - it doesn't cool very well in 95F weather. Is that reasonable?Vent airflow is good, I think. The R134a compressor has a 1/8" step in on the high side port. There is more to check.The evaporator must be clean as well as the condensor - was this a smoker's car?You should check the water control valve for the heater core. There are significant differences between R12, R134a, and R513A, which must be considered when handling, processing, applying, or retrofitting with these refrigerants. . But R22 is almost equally damaging. . Recovery & flushing is the only way out of an oil overcharge in your vehicle.B. The aux fan didn't switch on though and I didn't check the high side temperature. american sniper longest shot; how to adjust sunsetter awning arms; pastor jeremy roberts texas. El juny de 2017, el mateix grup va decidir crear un web deDoctor Who amb el mateix objectiu. PDF R134a R513A - Tecumseh Products Then at least I'd know really where I am on it. Is it exponential, squared? PDF COMPARISON OF Rl34a AND R12 REFRIGERANTS IN A VAPOUR - AIVC Back in that era, my business associates drove those things, brand new, and maybe I should take my Cadillac instead, no they wouldn't be caught dead in a Caddy, people of our esteem should be driving an MB. compressor, condenser, evaporator and expansion valve are specifically designed for use with R134a. Expansion Valve Differences R12 vs R134 - Automotive Air Conditioning The original expansion valves work very well with R134a. The analysis focuses on Coefficient of Performance for . Also, they are mostly used in refrigeration and automotive air conditioning systems. Paul -------------------------1983 Mercedes 240D on R12 and WVO!1192 Mercedes 300D 2.5 R134a1993 Toyota Pickup converted to R134a. Stay home and grill your own steaks and stir your own martini. Bookmarks: Digg; del . Below are the major differences between R134a and R12: Chemistry The chemical composition of R12 and R134a differ.

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