The maximum value is 1. Next, add a can of R12a from the low side fitting while running your A/C. Both of these gasses are very safe for use in all forms of refrigeration as theyre not flammable, explosive, or toxic. Its been likened to trying to convert a petrol engine to run on diesel. Hot spot auto parts .ca sells R12a for about $10/can and a $10 ALL IN ONE can with oil. 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. Most of all the differences gravitate to longevity, functionality, and safety. All signatories to the Montreal Treaty stopped the production of CFC products. Country of Origin: United States Hi, this is my first post, so please take it easy on the noob. Recharge the compressor with a/c ester oil and a tracer dye. Lets have a closer look at these similarities and differences. The air conditioning system in your car uses a combination of evaporation and condensation to cool the interior. This product does contain dangerous chemicals such as methyl chloride and vinyl chloride, both of which are carcinogenic and may cause congenital disabilities. When you add fluorescent tracer dye to with the refrigerant oil it helps to track down leaks that push oil out of the system. 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. You may have heard of a friend that did the job himself with borrowed equipment and 12 or 16 ounce cans of refrigerant. https://www.wiseautotools.com/mountain-quick-connect-r12-ac-gauge-conversion-to-134a/ A/C gauge conversion kits from R12 to R134A. 2021 Complete Guide. Most countries frown on the use of these gasses due to their environmental impact. On a long-dormant system, the odds are very high that its dead because it has no refrigerant in it, which means it has leaked out which means theres a leak that must be located and fixed. Problem solved, right? Theres no doubt that R12 refrigerant is one of the first compounds manufactured for the air conditioning and refrigeration world, but it had to be banned. Piston Slap: Booting a Torino in a snap without snaps? All compressors require oils to lubricate the moving parts. It is also used in automotive car conditioning and the plastic industry. Make sure to wear safety gloves, goggles, and shoes when theres a possibility of exposure to the chemical (R134a). The effect that R134a has on global warming makes this gas an unattractive product to many technicians. Refrigerant 134a, or R134a, was developed as an alternative to the CFC refrigerants known to cause environmental damage. You should keep in mind that recharging your air conditioner improperly could result in more serious damage. 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. No, its not possible to mix these two refrigerants. Start the car again and add R12A to bring the low side pressure to about 32 psi. Anyway on the low side R134a runs about 2 psi lower than R12 at equivalent temperatures. R134a systems operate at higher discharge-side pressures than R12, which can cause compressor seals to leak. 21, 1439 AH. As this chemical has carbon, hydrogen, and fluorine but no chlorine, its not dangerous to the ozone layer. Anyone selling R12 is required to verify that the buyer has an EPA Section 609 certification to work with mobile vehicle air conditioning (MVAC) systems. 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. I have never see the other way around. As these refrigerants are slowly phased out, there are still many questions that people have about them. Hence, the effect of R12 on global warming is up to 10,000 times higher than carbon dioxide. Lets take you through the advantages, disadvantages, and differences of these two refrigerants a detailed comparison including R12 vs R134a performance. The common problem when converting from R12 to R134a is lack of knowledge or equipment. Your email address will not be published. Hell, its possible that not all of the original A/C components are even there anymore. R12 was the first refrigerant created. You can then add ester oil thatll work with either R12 or R134a. Because A/C compressors have moving parts, they require oil. Refrigerant: Must be EPA-approved and cannot be intentionally released (vented) into the environment. And that brings us to, I continue to use R12 in two of my carsmy 1972 BMW 2002tii and 1973 Bavaria. The next piece of equipment to track down leaks is a leak sniffer. R134a is the most widely accepted alternative automotive refrigerant used to replace R12. Instead, top off R12 with R134a refrigerant. R134a and R12 are among the most popular types of refrigerants. This implies that the discharge pressure of the compressor should be moderate so it can produce the refrigerants condensation in the condenser at the atmospheric temperature. R134a isnt toxic, corrosive, explosive, or flammable, making it a good choice for air conditioning, but its cooling properties arent as good as R12. It has a lower global warming potential than R134a. Welcome to rxmechanic.com. Plus, not releasing the chemical into the air is morally justifiable. 3.5" Backlit Display & Visual Refrigerant Filling Window & High Strength MaterialHVAC digital manifold gauge set adopts 3.5-inch backlight display design,the data is easy to read,and each test result is divided by lines on the screen,the data is more intuitive.HVAC digital gauges is made of high-strength engineering plastic,with anti-slip I did a beer cooler with a target temp of 36 degrees, these are largely different pressures than you'll see in automotive which has a max desired temp of 60 degrees. In the automotive world, the replacement for R12 was tetrafluoroethane, a hydrofluorocarbon (HFC) branded as R134a. This is an electronic tool that sucks in air through a tube and across a sensor. However, some old air conditioning units still use them. These properties make it popular for domestic and commercial refrigeration. It provided much needed context as I embark on re-building the AC in my sons new (to him) 1988 Toyota pickup. In fact, R12 was used for many years as a propellant in a variety of aerosol products and sprayed directly into the air, and it is closely related to the halon used in fire extinguishers. 2001-2023 Griffiths Technical Inc. All Rights Reserved. R134a reacts with water to form hydrofluoric acid which damages the internal A/C components. Sponsored. Google use cookies for serving our ads and handling visitor statistics. 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. These guidelines are offered tohelp understand the differences . R134a was touted as the replacement for R12 until it too was deemed environmentally undesirable. 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. Compatible with multiple applications: The major reason for the introduction of R134a was to replace R12, so it functions perfectly in the same range of applications like rotary, screw, and centrifugal compressors for air conditioning and refrigeration. R12 is a powerful ozone depleted, while R134a and R1234yf are not. R12s boiling point is -21.6F or -29.8C. Many vehicles that contain this type of refrigerant will continue using it. These cheap kits usually have a few cans of R134a (either 12 ounce or 16 ounce), maybe an extra can of refrigerant oil, a few generic R134a charge port adapters and maybe some o-rings. 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. Here are a few of the more common questions. Their differences come mainly in their chemical make-up and environmental impact. Only licensed air conditioning companies and technicians may purchase this refrigerant. Important Features: Color-coded Easy to use Made of high-quality brass Specific for R-134a Pros: Easy to operate. There are many thousands of older air conditioning and refrigeration plants that use these refrigerants. This makes it expensive to purchase and adds to the attraction of replacing it with other greener products. Note also that, unlike mineral oil, both PAG oil and ester oil are hygroscopicthat is, they absorb water. I am currently retired and no longer do much with HVAC, however, I feel like I have a lot of knowledge in the subject and I wanted to create a website where I could talk about what I've learned and help upcoming HVAC techs. This can significantly affect energy consumption as the plant will operate for longer, or a larger plant will have to be installed. 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. Its called Polyol Ester Oil or POE oil. Most importantly, the oil used in the plant must always be compatible with the refrigerant used. When R12s effects on the ozone layer became known and it was superseded by R134a, EPA came down hard with large fines on both professionals and DIY-ers. This chemical is tetrafluoroethane, and its chemical formula is CH2FCF3. By using a qualified a/c shop with the proper equipment you odds are in your favor of having the job done correctly the first time. What is usually sniffed are all the connections in the system: hoses and compressor, condenser, drier, expansion valve and evaporator fittings. The reason is that the vehicles, for instance, manufactured currently configure the engine for R1234yf refrigerant, making no provision for replacement. As part of doing that, you often wind up replacing major portions of the systemnot because thats strictly required in order to convert it to R134a, but because thats what you need to do in order to get it functional again. But, if your car lacks enough condenser and you have many 100+ degree days then you may want to stick either increase air flow, add another condenser as we mentioned in The Mr. Ice Project or stick with R12. R12 will completely dissolve in mineral oil, but R134a wont. The problems that arise are related to the oils used in the system and the fact that they have different charge weights and different boiling points. Skin contact: If the R134a (liquid) comes in contact with your skin, it could cause a burn. Most vehicles manufactured before 1993 have the R12 A/C system. Technicians must capture and recycle R134a safely, and the gas must be disposed of by following the EPA guidelines. 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. Its among the greenhouse gases and will keep adding the current problem of heat not leaving the earths atmosphere. It's important to get good. Since 2010, all home AC systems manufactured use a refrigerant like R134a that has zero ozone depletion potential (ODP). If your a/c system is empty/low on refrigerant, if your system has a leak or if you need to open the system, then now is the time to decide which refrigerant you want to use. We say generally because the vehicle manufacturer may have a formula already worked out for the R134a conversion process. By noting the ambient temperature you can look up what the preferred high side pressure should be. The system will be checked for gross leaks while under vacuum. They differ in the number of ports, alias manifolds, that are used for attaching accessories. Price is reasonable Consistent and accurate Second, as youll see below, if you have to perform work on an A/C system that has refrigerant in it, it is illegal to vent the refrigerant (to let it escape into the atmosphere); it must be captured and recovered. Concentration level: The R134a vapor dilutes the oxygen concentration in the air to a low level, thereby causing harm. R12 has not be manufactured for a long time it was outlawed in the US. Bottom line, R134a simply doesn't cool as well as R12. He passed. It belongs to a class of chemicals known as HFCs, and they dont contain chlorine, so R134a doesnt damage the ozone layer. R12 is well known as a refrigerant used in many applications as its non-toxic, non-explosive, and non-flammable. The original rubber a/c hose lines in your car will leak out R12 through the hoses lining. 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. As this gas has such an effect on the environment, the EPA (Environmental Protection Agency) has strict guidelines for its use. This means that its classified as a greenhouse gas and will add to the current problems of heat not escaping the earths atmosphere. Its chemical symbol is CCl2F2. R12, on the other hand, is called chlorofluorocarbon (CFC). The safe high side pressures are determined with a PT (pressures and temperatures) chart. One cant discount its drawbacks, but theres a great deal of knowledge and information available on safely using the product. A comparison between R12 vs. R134a temperature will show that R12 has a higher temperature than R134a. Nevertheless, repeat after me: It is illegal to vent refrigerant. A simple rule of thumb conversion would be to take the amount of R12 refrigerant your system requires, in pounds, and multiply by 0.9 (your answer should be 90% of the R12 value). With R134a you do not rely on the site glass. Theyll continue to work for many years, as replacement is costly. The problem is that some inexpensive available refrigerantsammonia and propane, for exampleare poisonous and/or flammable. In sum, R12 has done more bad than good. EPA is authorized to assess fines of up to $37,500 per day for any violation of these regulations.. In todays world, the combination of its ozone-depleting ability and its contribution to global warming makes this product a major issue for many countries. The problem in all of this is the sentence As long as the system is functioning correctly and not leaking. Who in their right mind would take a tight, cold, R12-based system and convert it to less-efficient R134a? With a tight modernized system thatll accept either refrigerant, you should then consider where and how the system will be operated. Also, R134a cylinders are light-blue in color. R12 has a global warming potential factor of 2400. Well worth the money if your A/C system is still in good shape. However, its been shown that R134a is as destructive to the environment, and newer refrigerants have been created to overcome this problem. Thats not true either. All these industries still have old plants that use these refrigerants. The conversion to more modern refrigerants will require a replacement of the system, which will cause issues in terms of originality when showing this type of vehicle. The major difference between these two refrigerants is their chemical composition. Now, in the case of big American cars, with their massively overbuilt A/C systems and huge condensers, R134a conversion often worked fine. Though you can purchase 12 or 16 ounce cans of R134a from local retailers it is very difficult to measure out the correct amount into your system. This is why it is crucially important that R134a systems be properly evacuated (pumped down to boil off any moisture) and kept sealed. Since these days a can of R134a is about $15, the cost differential isnt what it was in the panicked days of the mid-1990s. R134a is NOT less efficient than R12 - Actually R134a is more efficient. This is a highly desirable property as it means that the boiling point is always below the targeted temperature. Providing they dont leak, theyre no risk to the environment. As for R134a and R1234yf, theres no room for conversion. 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. Converting these plants to run modern refrigerants will be extremely expensive, and in many cases, mean complete replacement; these plants will likely continue to run for many years. Lichamp HVAC R410A Manifold Gauge Set AC R134A, Freon R22 R32 410A 134A Diagnostic Manifold Gauge with Hose Kit Air Conditioner Refrigerant Recharge Kit Visit the Lichamp Store 403 ratings | 10 answered questions -27% $7999 List Price: $109.99 FREE Returns Available at a lower price from other sellers that may not offer free Prime shipping.

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