When the ambient air temps get above 80F the gauge readings can run a bit higher on the high side and lower on the low side when using R134a. Required fields are marked *. Which brings us to. The safe high side pressures are determined with a PT (pressures and temperatures) chart. R12 and R134a are older generation refrigerants that are no longer produced nor imported into the USA. The weight is only 2.4 ounces. You might find that the system doesn't get as cool even after properly charging it. Versus Ferrari F8 & Lamborghini Huracan Evo Cammisas Ultimate Drag Race Replay, Ultra RARE: Colin Chapmans Lotus Eleven + 327 Corvette Stingray with 4-speed | Barn Find Hunter Ep. link to Alternator Overcharging - Causes and Fixes, link to LS Head Bolt Torque Specs and Sequence. Then subtract 0.25 pounds. Theres no problem with using R134a in a home air conditioning system because it is a hydrofluorocarbon that doesnt cause environmental harm. This is a remarkable read about the history of R12 to R134a, and the reasons and (few) exceptions to not convert to R134a. When used in refrigerator and A/C systems, R12 cooled incredibly well. Unfortunately, the widespread use of R12 appeared to be significantly degrading the Earths ozone layer, potentially causing a worldwide health crisis. Of course, the receiver/drier needs to be replaced, as it does any time an A/C system is opened. The question instead is: Why is the system dead? Its been labeled as a greenhouse gas, and its use is no longer supported. R12 connectors were of the screw type, while R134a has push-on connectors similar to air tools. R12 is CFC: Even though R12 is one of the most commonly used refrigerants, it is CFC. This product is non-toxic, non-flammable, and not explosive, so its extremely safe to use for domestic refrigeration. 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. Generally this works well for the whole system. To discover the capacity for refrigerant, you want to use the specs for the current system and multiply the R12 charge by 0.9 or 90%. R134a is not an ozone-destroying agent, but it is a greenhouse gas, and is illegal to vent as well. The money you will save by will pay for the R12. Yes R12 systems did cool better than R134a, but there are differences and it is not wise to go back wards. With new R12 no longer being manufactured, the market price soared to $100/pound. However, R12 refrigerants are still used as fire retardants in aircraft and submarines. Of course, there could be other problems such as a seized compressor or a blocked expansion valve. While contained within a refrigeration system, this product is safe to use and poses no risk to the planet. R134a vs. R12 - Griffiths Both of these compounds have similar cooling properties. R12 is recognized as a very stable compound, and it wont break down under even the most stringent conditions, but if it comes in contact with flames or electrical heating elements, it breaks down into toxic components. h. c. F. Porsche AG. We don't save this data. R12s GWP is 10,910. This means that this compound is made up of carbon, chlorine, and fluorine. While the use of this product is steadily increasing in many developing countries, its now banned in the USA and, since 2020, is no longer manufactured or imported to the USA. A comparison between R12 vs. R134a temperature will show that R12 has a higher temperature than R134a. SureBilt R-134a High and Low Side Service Port Repair Kit $ 5. The original rubber a/c hose lines in your car will leak out R12 through the hoses lining. R12 systems use screw-on connectors, while R134a systems use push-on connectors similar to those used in air tools. Carbon dioxide is deemed to have a value of 1, so the higher the compounds factor, the greater its effect on global warming. With the knowledge of the differences, youll be able to draw a comparison between R12 vs R134a efficiency. Yes, theres a certain irony in the fact that weve gone full-circle from the invasive youll need to replace almost everything including the compressor and hoses in order to properly convert R12 to R134a to you dont need to replace all that much; just flush it, new oil, new drier and o-rings, and back to youll need to replace almost everything including the compressor, hoses, and the condenser. But this change has occurred both because the cars are that much older than they were when the R12 to R134a change occurred in the mid-1990s, and there is now a better understanding of the need to take advantage of updated compressors and condensers in order to get the A/C systems to blow adequately cold with R134a. Another way to check is to look at the air conditioning connectors. If your cars system has a sufficient condenser design and air flow to expel the greater amount of heat extracted by R134a, then by all means you should convert over when the time comes. The original expansion valves work very well with R134a. SKU # 532244. . R134a is classified as a dangerous greenhouse gas that contributes to global warming. In many parts of the world, its now viewed as a greenhouse gas, and its use is discouraged. The higher the ambient temperature the higher the high side pressure. There are many thousands of older air conditioning and refrigeration plants that use these refrigerants. Below are the major differences between R134a and R12: The chemical composition of R12 and R134a differ. The Internet is a large and often-strange place, and if you want to search for sites that claim that R12 isnt harmful to the ozone layer, and that the whole thing was a conspiracy by DuPont because its patent on R12 was about to expire, youll find them. We chose to use 5-6 ounces of oil to be on the safe side: 3-4 ounces for the compressor, 1 oz of oil for the drier and another ounce of oil for system losses. And that brings us to, I continue to use R12 in two of my carsmy 1972 BMW 2002tii and 1973 Bavaria. R134a refrigerant is lighter than R12. For this reason, when a car is being sold these days, R12 is often seen as a liability, a looming conversion expense, even if the system is functional and cold. 134A HVACR versus 134A Automotive..Difference?? - HVAC-Talk: Heating But, if your old compressor has lock-up or if your current expansion valve is not functional it would wise to replace the expansion valve with a valve designed for R134a. Also, R134a cylinders are light-blue in color. Let's talk about refridgerants: R-12a or R-134a? | TDIClub Forums As this chemical has carbon, hydrogen, and fluorine but no chlorine, its not dangerous to the ozone layer. Sponsored. If your car was produced after 1994, it likely has R134a used as the refrigerant. Tech Talk - Differences between R-1234yf and R-134a - FJC Inc Its still one of the most efficient at cooling, but the destructive effects on the ozone layer and its very high global warming potential have made this environmentally an unwise choice. 5 foreign cars that were copied from American style. Because the two oils were different, R134a certainly wasnt a drop-in replacement for R12. There are significant differences between R12, R134a, and R513A, which must be considered when handling, processing, applying, or retrofitting with these refrigerants. R134a is safe to use as its not toxic, flammable, or explosive. For those of you who are considering what the cost is for R12 you can think of it this way: Dont go out to dinner this weekend. In more serious, it could result in cardiac irregularities or death. You may have heard of a friend that did the job himself with borrowed equipment and 12 or 16 ounce cans of refrigerant. Sold by e7tools and ships from Amazon Fulfillment. R12, on the other hand, is called chlorofluorocarbon (CFC). Just leave it alone for now. The air conditioning system in your car uses a combination of evaporation and condensation to cool the interior. Therefore, the R12 refrigerant is illegal, and emitting it is illegal. Dont do it. Its better that this is done by professional technicians as venting any of this gas into the atmosphere is environmentally damaging and illegal. R12, on the other hand, has an ozone depletion potential of 1, implying that it can damage the ozone layer. The alternator, sometimes called a generator, generates electricity to charge the battery and power all the electric auxiliaries while driving. That makes it safe in terms of safety to use. However, there are some drawbacks to using this type as well. Unfortunately, this product still contains chlorine. Even though their common major function is to cool the system, they have many differences. Hence, the effect of R12 on global warming is up to 10,000 times higher than carbon dioxide. A final difference is that most (though not all) R-1234yf cars will have a Suction Line Heat Exchanger. R12 uses mineral oil, but R134a wont dissolve in mineral oil. It is a haloalkane and hydrofluorocarbon (HFC) refrigerant that has thermodynamic properties, potential global warming for one hundred years, and insignificant ozone depletion. The major reason for the replacement of R12 with R134a was to curb future greenhouse effects. This chart has a column of ambient (outside) air temperatures on one side and a corresponding range of high side pressures on the other side. I can tell you that R12 is some seriously great refrigerant; it gets both of these cars meat-locker cold almost from the instant the A/C is turned on. Whether R134a performs as well as R12 in any given a/c system depends upon system components and the . Its cylinders are colored white. Disconnect the two hose lines to the compressor, protect the ends from getting dirty. You do not need to replace every o-ring in the system, but if you happen to open a connection that has an o-ring you should replace the old o-ring with one that is compatible with R134a and lubricate the o-ring with ac oil. PDF A Comparison Between Refrigerants Used In Air Conditioning Any new installation of refrigeration or air conditioning wont use R134a as a refrigerant as the production and importation of this gas to the US has been banned. 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. On the other hand, R12 has a global warming potential of 10,910. Additionally, R134a was introduced as a replacement for R22 and R12 in high and medium-temperature refrigeration systems like domestic and commercial chillers. So as long as the system was functioning correctly and not leaking, it appeared that you could flush the system of any old oil, change the oil in the compressor to PAG or ester oil, replace only the receiver-drier and the o-rings, screw on the charging port adapters, evacuate the system, and recharge it with the new R134a, using about 80% as much as the original R12 volume. ODP = 0, Has a global warming potential (GWP) of 10900, No longer manufactured or imported into the USA, Has an ozone depletion factor (ODP) of 1 which is the highest possible, Has a global warming potential (GWP) of 1430. Inhalation of vapor: Inhaling a large amount of R134a vapor can lead to drowsiness, temporary nervous system depression, and lethargy. Its improbable that any new installation will be built that uses this refrigerant as its use is deemed highly undesirable in many countries and international environmental treaties discourage its use. We mention using ester type refrigerant oil. However, it must be noted that itll disintegrate into toxic compounds when exposed to flame. You should keep in mind that recharging your air conditioner improperly could result in more serious damage. Its likely that these plants, which will be expensive to convert, will continue to use R12 with careful maintenance. The hose length is 60 inches and comes with a 1-year warranty. All references (pictorial or text) to the Porsche name, model names or numbers, part numbers or shapes are replacement reference only. R134a is a pure refrigerant that is sometimes used in blends, while R410a is itself a blend. We recently created this blog site to enable us to share our knowledge with other automotive mechanics and car owners. R134a vs R12 refrigerant? This would become an expensive investment for a repair or service station to have unique dedicated equipment for every type of alternative refrigerant. These attributes make it very attractive for domestic refrigeration. (To be clear, both cars also have a new rotary-style compressor and a big parallel-flow condenser and fan.). But many European cars, such as the vintage BMWs I love, had A/C systems that never functioned all that well even when they were new and charged up with R12.
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