By after changing just about everything, he got what was termed, satisfactory cooling. With the oil leaking out and being told all sorts of things about how these compressors don't have a sump etc, I wanted to be on the safe side. When the sensor detects the refrigerant leak the sniffers lights glow and the sniffer makes a noise. (On firewall where A/C lines go into cab.) Heres R12 vs. R134a pressure chart. The newer valves and switches will work with both refrigerants. Theres no problem with using R134a in a home air conditioning system because it is a hydrofluorocarbon that doesnt cause environmental harm. The safe high side pressures are determined with a PT (pressures and temperatures) chart. All pre-97 XJs use systems with the same basic operating principle, although the parts do change a bit. The OEM spec is 2300 rpm @ 12.6v (engine stopped fully charged battery). . . #19. -------------------------1983 Mercedes 240D on R12 and WVO!1192 Mercedes 300D 2.5 R134a1993 Toyota Pickup converted to R134a, Hi pdrayton- If you can remember the oil capacity that you found in all your research and post that, then bohica and others can have a better idea if you have too much; see if you can find that info! . Then, subtract that result by 0.25 pounds to get the proper amount of R134a charge. Post photos, respond to polls and access other special features. 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. We are an automotive mechanic blog that helps mechanics and car users to find the most recent and accurate technical and repair information for their cars. Edited: Sat July 14, 2007 at 10:22 PM by fonebone. -------------------------"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest." link to How to cut off a Catalytic Converter. 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. Before landing on the debate of R134 vs R12 you should know that both R134a and R12 are AC refrigerants types used in refrigeration and air conditioning systems. Flush with a garden hose - do not use a high pressure washer - you can bend the fins flat & damage the condensor.B. The evap is hard to get at. In a comparison between R12 vs R134a vs R1234yf, R1234yf will pass as the best refrigerant. Lasers don't do well on vent temps, a stick thermometer is better in that application. However, R134a is better than R12. Its cylinders are colored white. Environmental Impact: When R134a escapes into the atmosphere, it contributes to global warming. Be sure to test @ 1500 to 2000 engine rpm, and record the ambient temp as well. Some 1993 and older R12 systems aren't as 'compatible' as you'd think to switch over. This is due to many facts: R134a refrigerant is about 10% less efficient in moving heat than R12! Kommentare . The name of the oil is Polyol Ester (POE). An orifice tube is just a fixed nozzle that pisses refrigerant into the evaporator without any sort of feedback. Recovery & flushing is the only way out of an oil overcharge in your vehicle.B. 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. CONCLUSIONS The differences in the theoretical C.O.P.H calculated for R12 and R134a are consistent with values quoted in the literature. In 1994 they switched from R-12 to R-134a. The difference really shows up on the high side. Miscibility with oil: R12 can be mixed with the compressor oil no matter the operating condition. The original rubber a/c hose lines in your car will leak out R12 through the hoses lining. of coiled cap tube on VCR system with R134a. I have some experience with auto a/c but not too much. The higher the ambient temperature the higher the high side pressure. Instead of using R12, its preferable to use R134a because it is very easy to find in the market, its sold at an affordable price, and is environmentally friendly. Since the hose is the stock hose, you cannot tell what refrigerant is inside. Helical and Serpentine coils. In the automotive world, the replacement for R12 was R134a. The global warming potential measures the amount of heat trapped by any gas compared to the amount of heat trapped by the same amount of carbon dioxide. I put one in my old daily driver '79 Chevy tank (r-12), and it really made a difference. I mean, really a lot. R12 is otherwise called dichlorodifluoromethane is a colorless gas (chlorofluorocarbon halomethane (CPC) that is used as an aerosol spray propellant and a refrigerant, and is soluble in organic solvents. Electric fans do wear out. He started writing automotive articles to share his garage experience with car enthusiasts and armature mechanics. A final difference is that most (though not all) R-1234yf cars will have a Suction Line Heat Exchanger. Anyone know what happens when an R12 expansion valve is used in a system charged with R134A? Still, I have some simple green, so may as well give it a go. The analysis focuses on Coefficient of Performance for . The cure is to use the newer R134a compressors is sealing washers that are different thickness. The cure is to use the newer R134a compressors is sealing washers that are different thickness. Edited: Tue July 17, 2007 at 3:25 AM by bohica2xo, I believe there is only one switch - the refrigerant switch. The general practice of charging the system with 15% less refrigerant adds to the thermal deficiency of R134a. So that indicates it is cooling well there doesn't it? Refrigerators generally utilize R22, R32, or 410A-based coolants as their cooling agent. The ratings for evaporator temperatures 40F, 20F, -10F, -40F in the capacity tables are in accordance with ANSI/ARI = R134a Charge Level R12 Expansion Valve = 201 830 06 84 R134A Expansion Valve = 201 830 04 84 Is there a difference after all? Temp switch works the aux fan. The general practice of charging the system with 15% less refrigerant adds to the thermal deficiency of R134a. The Wikipedia explanation for expansions valves cited in Frank's thread says that the gas inside the bulb in the metering valve is the same as the refrigerant 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. R12 and R22 are both now banned by the EPA in the United States. Paul:A 1983 240D should have a York compressor on an OEM system. Well, I'm not sure it is 'fine' - it doesn't cool very well in 95F weather. They plug all the time. If ambient is 90 (today) and the output of the condensor is 110, that's pretty good isn't it? At this point it is time to make an appointment with the a/c shop. Recharge the compressor with a/c ester oil and a tracer dye. If there is a resource I should read first to save you time, let me know. I have a laser temp reader, and it says the temps going into the condensor are up to 160F - coming out it is always around 110 or so. Paul:It is never a waste of my time to chat with someone that understands the problem, and wants to fix it. What effect would it have on performance, if any? I think so. With R12 you use to check to see if the site glass was full, if it had bubbles it meant you had a low charge. On this website we are addressing only R134a and not other suggested drop in replacements. Minor adjustments to the expansion valve and other controls may be necessary for some plans. It is made up of carbon, hydrogen, and fluorine. Just leave it alone for now. R12, on the other hand, is called chlorofluorocarbon (CFC). If the system was upgraded by a professional it should have an upgrade sticker. It will work and there will be very little, in any difference in performance.As Chick stated, the difference is only the gas used in the sensor tube. But some types of PAG do not mix well with the old residual R12 mineral oil left in the system components whereas ester does mix very well. Once you have replaced the OEM condensor with a PF unit, you will need to make custom hoses to mate with your OEM system. The primary function of the design engineer is to make things difficult for the fabricator and impossible for the serviceman. Only show this user. american sniper longest shot; how to adjust sunsetter awning arms; pastor jeremy roberts texas. The ozone depletion potential of a chemical is a factor that shows the level of degradation itll cause to the ozone layer that surrounds and secures the earth from harmful radiation. Large temperature difference between expansion valve inlet and outlet oReplace expansion valve Air . In this study, without the need for major modifications to the bus air conditioner, the variation of the ejector dimensions according to different parameters has been investigated in the case of using the R1234yf, R1234ze(E), or R600a refrigerants, which may be a substitute for R134a as a refrigerant due to . Biggest you can fit in there is best. Make sure visiually that no large gaps exist that would allow the air to bypass the condensor on the way to the radiator.B. The value of carbon dioxide is 1. Your old hoses of course will not fit. Can I use the one for the R-12? And, unfortunately a small high side pressure gauge on a short hose. I am ordering new parts, and planning to convert my system to R-134a. The problem with not being an expert is that you don't know what is important and what's not. Hope this helps. hardly noticable. Not going to mess up your 'do, but you can feel it. It is common for eurocar threads to go multiple pages, and as Nick points out - sometimes cool is all you will ever get. I know this is bad, etc, and deposits on the metal can act as insulators. 5. We say generally because the vehicle manufacturer may have a formula already worked out for the R134a conversion process. 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. Compared with the cost-performance ratio, R507 is 30-40% . Like say half a can or so recharge come springtime warm weather or something. 5) A/C System Failure. Given two identical vehicles, each with the same weighted amount of refrigerant, the vehicle with the R134a has the capability to remove more heat (measured in btus) from the vehicle than the same type of vehicle using the same amount of R12. Trinary Pressure Switch quantity. Condensers designed to release greater amounts of heat help to expel the greater amount of heat which R134a removes from the cars interior. The chemical composition of R12 and R134a differ. If your compressor requires replacement or its seals and o-rings need to be replaced due to leakage, it would be wise at this time to either obtain a compressor that has o-rings and seals that are compatible with R134a or have your unit re-manufactured with compatible components. July 3, 2022July 3, 2022. leading to corrosion of expansion valves, capillary tube plugging, and compressor bearing . Using R134a requires that Polyolester (POE) lubricant must be used in the compressor. You do not want to exceed the systems high side recommendations. -------------------------"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest." However, theyre still used in older plants, systems, and the automotive industry. -------------------------"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest." Most vehicles manufactured before 1993 have the R12 A/C system. Whenever its exposed to the environment, it changes to a gas. Since there is only about a 10% difference between R-12 and R-134a, the expansion valve being self-compensating really doesn't make that much difference. Generally the system will be initially charged with approximately 80% to 85% of the original amount of R12, using R134a. You do not need to replace the expansion valve in most cases. The oil is spread all over your system when it is at rest. Inhalation of vapor: Inhaling a large amount of R134a vapor can lead to drowsiness, temporary nervous system depression, and lethargy. Its duty is to convert toxic gasses produced by the engine into A brake cleaner is a powerful solvent for cleaning dirt from the brakes and other car components. Are r12 and r134 fittings different? 3) A TXV optimized for 134a will be ok with R12. Autor de l'entrada Per ; Data de l'entrada calexico west port of entry hours; 12 month libor rate 2021 a difference between r12 and r134a expansion valve a 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. If 50 degrees across the cond. The only material difference between automotive A/C and a window A/C unit or refrigerator is that in the home application, the components are all inside the same rectangular box, but in the automotive application, the components are distributed throughout the car. A/C receiver difference between R12 and R134a? I think the way to go here is1. R134a has the chemical formula CF3CH2F and is known as tetrafluoroethane. 2001-2023 Griffiths Technical Inc. All Rights Reserved. It is usually sold under the brand name, Freon 12. -The amount of R-134a needed will typically be 80-90% of the R-12 charge. 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. how to get to disney springs from boardwalk / bb dakota plaid jacket canada / difference between r12 and r134a expansion valve. R134a vs R12 refrigerant? Spray it deep, and let it sit for a few minutes. Rules governing changing from the former to the latter differ between countries. 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. Safety: R134a is safe to use as its non-flammable and cant explode. Above this temperature, the saturation pressure of R134a is higher than that of R12; below, it is lower. 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. Mine was 61, so the system is not working as it is supposed to. You will be fine with a 134a-compatible TXV running R12. The larger fitting goes on the discharge port and the smaller fitting goes on the suction line or compressor inlet / suction port. Any suggestions, or do you need to know the hi/lo readings? There are two hoses listed, R-12 64-53-1-377-821 for $72.50, and R-134a 64-53-8-391-051 fro $262.50. Different correction factors are applied to other refrigerants. You can use this space to go into a little more detail about your company. And I already have so much time and money in this a/c project that I REFUSE to cut any corners as small as a TEV.It doesn't help that most people in the business (at least that I come in contact with, present company excluded, of course!) 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. And by matching the correct amount of R134a to use in a given vehicle, correcting the superheat of the expansion valve (if necessary), you can in some manner nearly balance or match the amount of heat drawn out by the evaporator and released by the condenser. El maig de 2016, un grup damics van crear un lloc web deOne Piece amb lobjectiu doferir la srie doblada en catal de forma gratuta i crear una comunitat que inclogus informaci, notcies i ms. difference between r12 and r134a expansion valvewarning signs for a deteriorating patient with covid 19 infection 2022.07.03 18:36 18:36 Gnats & mosquitos will clog deep. With the A/c off hi and lo were both at 105psi. Plus, not releasing the chemical into the air is morally justifiable. This is 11F off the FSM performance graph - vent should be around 50F. This refers to BTU's (heat) moved per pound of refrigerant moved. Even if the system leaks, repairing the leaks and recharging it with R-12 is usually the best repair alternative. Quick View. Besides, R134a refrigerant was manufactured after R12 was banned to help reduce the harshness of the old chemical (R12) on the ozone layer.
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