The only refrigerant currently approved by equipment and motor manufacturers for use in air-conditioning systems is R134a, although other replacement chemicals, some Typical 134a charge rate will be approximately 70-80% of the factory R12 … conversion, for example to R134a. If the system is empty, you can either keep it R12 or retrofit to R134a. R134a is a HFC, used in automotive air conditioning and as a replacement for R12 and R22 in medium and high temperature refrigeration applications, such as … Popularity - 4,911 views, 25.6 views per day, 192 days on eBay. Now, accidentally mixing refrigerants can cause lots of strange problems. The molecular weight of refrigerant R134a is 133.4 and its boiling point is -15.1 degree F. Refrigerant R134a is a hydrofluorocarbon (HFC) that has zero potential to cause the depletion of the ozone layer and very little greenhouse effect. While R513A is a viable option for new and existing equipment, it is not a "drop- in" replacement for R12 or R134a. Ac systems work on 2 primary principals: temperature, and pressures.The pressures in R134a are higher than R12, and the system is sealed tighter. In a little-known Armstrong Labs experiment, a subject was exposed to R134a for four and a half minutes before his pulse and blood pressure became nonexistant. R134A Can Tap Valve Refrigerant Dispenser Tool with Tank Adapter for 1/4 and 1/2 inch AC Freon Charging Hose. Super high amount of views. Charge with 134a between 70-80% of the original R12 charge amount. r12 vs r134a Bottom line, 134 doesn't blow as cold as r12. In my opinion it will be much safer than using R134A … The original environmental effect of R12 Freon on the ozone layer is well known and R12 had to go, there was no question of that and I fully agree with the restraints that were put on R12 including its use, handling and recovery. Its chemical formula is CF3CH2F. The concern that the original R12 hoses would leak R134a like a screen door on a submarine appeared to be largely unfounded, as the insides of original hoses seemed to naturally become impregnated with a combination of refrigerant and oil that acted as a barrier. one option that does help is swapping the R12 style condenser to a high efficiency R134a style condenser. Once you’ve got all the new equipment in place it’s time to evacuate your system to draw a vacuum and also to remove any old refrigerant and old oil. Using an R134A gauge set (or an R12 set with conversion), connect the red line to the high-side, blue line to the low-side, the yellow line to the vacuum pump. An R134a-specific expansion valve was preferred but not strictly necessary. when converting to R134a, you have to eliminate all the old oil from the system, replace the receiver/drier, and swap to a barrier style hose, as well as change the seals in the compressor as the R134a molecule is smaller than the R12 molecule. While the formula above is helpful, you might be strapped for time and need an answer quickly. The refrigerant R134a is the chemical compound tetrafluoroethane. Venting R134a comes with a hefty fine and/or jail time (just like R12). Hydrocarbons are non-corrosive, nontoxic, non-ozone depleting, non-global warming, and much more energy efficient than CFC's or HFC's. R134a refrigerant O-rings are of a different composition than those for R12 systems. a) r134a refrigerant properties. 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. 3 Way AC Diagnostic Manifold Gauge Set for Freon Charging, Fits R134A R12 R22 and R502 Refrigerants, with 5FT Hose, ACME Tank Adapters, Adjustable Couplers and Can Tap. Your options are to locate some R12, however you must be certified to purchase, and add it with an R-12 recharge hose. Anyway, it seems if you can retrofit and replace R12 with R134a, then the opposite should also be true. Below is a PDF of tables that show R12 to R134a refrigerant charge conversions in pounds and ounces: R12 to R134a Conversion Tables – Pounds & Ounces. Is that why expansion valves are specific to R12 or R134A? R134a is an extremely common refrigerant used in a wide range of refrigeration and air conditioning applications, including medium and high temperature refrigeration (both domestic and commercial), residential & light air conditioning, automotive air conditioning and industrial applications such as centrifugal chillers. It replaced R12 in the early 90s because it is less likely to bind to ozone and degrade the ozone layer of the atmosphere. Is he lucky to not of had his friends cars damaged or can I just put in R134a in my R12 system without evacuating out R12. Also, because R134a is a smaller molecule that R12, it is more likely to leak out of the system than R12. However, r134a is widely available and much cheaper to use than the very new r1234yf so we would suggest converting your car to r134a. When retrofitting a R12 system to R134a, about all that's done is change the oil. You should vacuum the system for at least 45 minutes once the vacuum gets to ~29.5". Find many great new & used options and get the best deals for Compressor, True GDM72, Refrigeration, Tecumseh AKA4476YX, 1/2HP, R134a or R12 at the best online prices at … You want to keep the R134a conversion, because you havent flushed and cleard the system to properly use any other refrigerant. 6 sold, 0 available. R-134a O-rings are blue or green in color. HELPFUL HINTS. R12 was phased out and made illegal in the 1990’s, due to it’s ozone depleting properties, and replaced with r134a, which itself is now being replaced with the newer r1234yf. HC12a System Versus R134a System By Charles Fox (Excerpt) Hydrocarbons are the best refrigerants for existing systems whether it is an R12 system or a R134a system and to my knowledge that has never been disputed. Assuming that it's still an R12 system and it's just low, buy a couple cans of R12 on Craigslist and find a friend with some gauges and add enough to clear the sight glass. Yes it is dangerous to use R134a refrigerant in R12 system without retro fitting, but don't expect like Hiroshima explosion. Where you'd have the same car and year and one would have the R12 the other wouldn't. There are significant differences between R12, R134a, and R513A, which must be considered when handling, processing, applying, or retrofitting with these refrigerants. I believe Freeze 12 is a hydrocarbon refrigerant and if it is, it is compatible with R12 and the original oil. Early on the general shops stocked up with R12, then there were a lot of "R12 alternatives" that supposedly could be used tyo top off genuine R12 systems , then the business sortoff defaulted to R134 conversions as R134 became the predominant refridgerant for aircon all types. R134A Can Tap Valve Kit, AC R134A Adapters Quick Couplers, for R12 R22 Manifold Gauge High Low Quick Couplers, with Tank Adapter for 1/4 and 1/2 inch AC … Ignore the sight-glass. R134a is widely used all over the world as a main substitute of R12 fir refrigeration equipment operating within middle-temperature range. Changing the end couplings of your R12 gauges with R134a couplings makes adding R12 very easy and due to the lack of demand of R12, the prices have actually been coming down. Trouble is, Freon gets a bit more expensive and a bit harder to come by every year. R-134a is an HFC refrigerant, which requires polyolester (POE) lubricant to be used in the compressor. R-12 O-rings are black in color. If you have a set of R12 charging hoses and gauges, you can just adapt a small propane cylinder and charge your system. A properly charged 134a system will likely show bubbles in the sight-glass. However, the compressor must use a synthetic polyester lubricating oil. ---This will allow you to tap into refrigerant cans that have the 1/2" Male ACME (Envirosafe and R134a cans) and then charge R12 or R22 systems. Key properties of the main refrigerants are given in together with their typical application ranges; R134a uses different ports to charge the system and to measure pressures so the old R12 ports need to be removed and replaced or retrofitted with adapters. As for oil issues, R134a simply won't carry the oil, but it will not react. Otherwise, it is acceptable for R12 to remain in use in an air-conditioning system until the end of its service life. You can also use PAG (Poly Alkylene Glycol) or Castrol Retro Oil for lubricant. the coldest possible is a term that is severely limited in its practicality. Or you can convert the system using one of our R134a retrofit kits, that will allow you to now add 134a refrigerant to your automotive air conditioning system. PicClick Insights - Compressor, True GDM72, Refrigeration, Tecumseh AKA4476YX, 1/2HP, R134a or R12 PicClick Exclusive. FJC 2710 A/C System Flush Kit. Ester oil charge for lubrication (amount varies by model year). For GM the 1994 year was the first model year for the R134a on the W-bodies, I wouldn't be surprised if there were instances where automakers switched mid-model year. In either case, find and fix the leak. Replace any o-rings with 134a compatible. R12 to R134a Refrigerant Charge Conversion Charts. R134a is a HFC, used in automotive air conditioning and as a replacement for R12 and R22 in medium and high temperature refrigeration applications, such as commercial and domestic refrigeration and chillers. I have the original (R12) style expansion valve in the Maverick AC system. Tecumseh as a suitable replacement for R134a. * Molecular size of R134a is smaller than R12 so it will leak through the hoses and flare fitting that R12 system has. The $70.00 Retro fit kits you buy at your local Schucks or wherever are not infallable and you usually end up going through a seal here and there, not to mention having to go somewhere with a reclaimer to get the freon purged anyway. Lets Talk Chemicals-R134a: Industry name for 1,1,1,2-Tetrafluoroethane, a fluorocarbon aerosol and refrigerant. R134a is capable to be at temperatures of -28°C at room temperatures of 38°C, its performance being very similar to that of an R12. Additional Info from the Forum A friend has been filling R12 systems on cars with R134a and says there is no need to evacuate out R12, he has done it for years on many cars. The leaking r12 system gets repaired and converted to r134a. But if the system is properly retrofitted, it should work just fine. This is a R134a (1/2" ACME) Screw-on can taper with a R12 or R22, 1/4" Charging Hose ConnectionES Part# 3345 ---The 1/4" female connection to the system does have a valve core depressor on it! Open both high- and low-side valves. New South Wales went way further than most Australian states by requiring Technicians to be licensed and educated.