difference between r12 and r134a gauges

Generally the system will be initially charged with approximately 80% to 85% of the original amount of R12, using R134a. 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. Meanwhile, the R-134a gas has a COP of 4.62, which is lower than the other two gases. If your car does not have a high pressure cut-out switch in the AC system then youll need to have one installed (call us if you need help). This means that this compound is made up of carbon, chlorine, and fluorine. This means that its classified as a greenhouse gas and will add to the current problems of heat not escaping the earths atmosphere. R-134a entirely dominated the automotive market by 1994. Sign up for the latest automotive news and videosin short, everything for people who love cars. But once youre on that path, you can improve the system with a new compressor and parallel-flow condenser which, in most cases, will allow you to get good results with R134a. If an A/C system isnt working, the root cause needs to be diagnosed, and the system needs to be fixed. However, you will need different recovery machines and other equipment to handle R1234yf. This should give you a rough idea of how much youll need. 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. The problem with these so called drop in replacements is that to properly handle them you may need dedicated equipment to identify the gas and evacuate it for proper disposal. However, R12 refrigerants are still used as fire retardants in aircraft and submarines. 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. First things first. They frame it as a replacement for R134a in cars and other vehicles. R134a is an HFC or tetrafluoroethane, and its chemical formula is CH2FCF3. My name is Bob Wells and I am a retired HVAC tech from Washington state. Hot spot auto parts .ca sells R12a for about $10/can and a $10 ALL IN ONE can with oil. To be absolutely clear, these refrigerants are not EPA-approved and shouldnt be used. Swapping the components isnt a herculean task, but recharging the AC is a challenge. Whenever its exposed to the environment, it changes to a gas. The following is verbatim from EPAs website: EPA performs random inspections, responds to tips, and pursues potential cases against violators of the Section 608 regulations. (To be clear, both cars also have a new rotary-style compressor and a big parallel-flow condenser and fan.). The main difference between R12, R134a, and R1234yf is their effect on the environment. R134a replaced R12 from 1994 onwards. The advantage of ester oil is that it works with both R12 as well as R134a, so you can fill the system with it and then use either refrigerant. R12 has an ODP of 1, meaning that it has the highest potential to destroy the ozone layer. The molecule size of R134a is smaller than that of R12, so there was concern that R134a could leak out through the hoses and flare fittings that R12 systems used. R134a is used in many applications such as: Although this type is better than R12, using this kind of refrigerant also has some problems associated with it. How to Convert Your Car AC R12 System To R134a - Mechanic Base Then there are three new EPA-approved climate-friendly alternatives. There is R1234yf, which is already being used on new cars but is classified as mildly flammable. At $70 per pound, no one is using it in retrofit applications. 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. Unfortunately, the R12 refrigerant doesnt always blow cold air. rate between the temperature range of -40 C and -10 C is R134a liquid's, while the lowest is the R1270's. Having a low mass flow rate with in the system is a parameter that reduces the cost of operating. Its been labeled as a greenhouse gas, and its use is no longer supported. 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. 29. R134a is still used in the automotive industry as a refrigerant and in other industries, such as pharmaceuticals, as a propellant. The manufacture and sale of the small cans of R12 used by hobbyists to top off a system also ended, although New Old Stock (NOS) cans of R12 are still privately traded on eBay and Craigslist (Ill come back to that). We say generally because the vehicle manufacturer may have a formula already worked out for the R134a conversion process. Well worth the money if your A/C system is still in good shape. What's the difference between these and how do. R12 was used mainly in domestic and commercial refrigeration, while R134a was used mainly by the automotive industry. Like R12, this product is non-toxic, non-flammable, and not explosive. The following bullets are verbatim from EPAs website: There is an additional requirement that the cars A/C have charging fittings that are unique to the refrigerant being used, but its the venting part thats of the most interest, as its the area where you can get fined. The two systems use different fittings. This is not to say that one of these small retro-fit kits cant be used, however to be used wisely. R22, or to give it its proper chemical name, chlorodifluoromethane (CHCIF), is a colorless, odorless, non-toxic, non-flammable alternative to older refrigerants.

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