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. Just leave it alone for now. The substitute that we used for R-12 was the new HFC called R-134a. Expansion valves are an active device, they regulate the flow of refrigerant to the evaporator depending on evaporator temperature. I'm curiousSo there is work to do, ie performance should be able to be improved. 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. Some 1993 and older R12 systems aren't as 'compatible' as you'd think to switch over. 4.3 out of 5 stars 491. Even if the system leaks, repairing the leaks and recharging it with R-12 is usually the best repair alternative. Rules governing changing from the former to the latter differ between countries. I'm doing one thing at a time so I know what the cause was. In the automotive world, the replacement for R12 was R134a. But I don't want to waste your time. -------------------------"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." According to the thermodynamic characteristics, it is close to the R12 freon, however, it is 10-15% worse in terms of cooling capacity and is more fluid. This is because R134a. 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. Look at where the lines will end up. When you add fluorescent tracer dye to with the refrigerant oil it helps to track down leaks that push oil out of the system. 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. . That switch should close @ 52c. So, instead of using R12, other better options include R401b, R134a, R401a, etc. About four or five years ago, I guy with an MB came here with the same problem, that tread was over six pages long. in /nfs/c05/h04/mnt/113983/domains/toragrafix.com/html/wp-content . Hence, the effect of R12 on global warming is up to 10,000 times higher than carbon dioxide. Any ideas from the info above? Als nostres webs oferimOne Piece,Doctor Who,Torchwood, El Detectiu ConaniSlam Dunkdoblats en catal. The problem with not being an expert is that you don't know what is important and what's not. There are significant differences between R12, R134a, and R513A, which must be considered when handling, processing, applying, or retrofitting with these refrigerants. That is for the compressor, drier, expansion valve and condenser. Swapping the components isnt a herculean task, but recharging the AC is a challenge. had writing on the side that said R134a. Below are the major differences between R134a and R12: The chemical composition of R12 and R134a differ. Ensure you contact a professional mechanic to do the work for you so you dont end up incurring more costs for yourself. 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. 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 he synthesized R-134a in 1936, 5 years after R-12 was . Should I do the test again with the the aux fan jumpered? There is a lot of differences between the R12 and the R134a fittings, you can't mistake them. In sum, R12 has done more bad than good. If you still find it difficult to use R134a in a home AC system, you can check out a comparison of R12 vs R134a fittings to know the refrigerant that best fits the AC system. 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. Yep, definately not a meat locker. For instance you can evacuate FRIGC FR-12 into a refrigerant recovery bottle that has R134a in it or visa versa. On the other hand, R12 has a global warming potential of 10,910. We recently created this blog site to enable us to share our knowledge with other automotive mechanics and car owners. I don't believe it is but I had a service guy tell me it needs to be done. R134a and R12 are among the most popular types of refrigerants. Very nice! Recovery & flushing is the only way out of an oil overcharge in your vehicle.B. 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. One of the differences between auto air conditioners that have been redesigned from R12 to R134a is that the condensers have gone from serpentine to pseudo-parallel. 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. Recharge the compressor with a/c ester oil and a tracer dye. Still, I have some simple green, so may as well give it a go. 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. I am ordering new parts, and planning to convert my system to R-134a. But I've read that these car's didn't do too well in the a/c stakes, so that might just be as good as it gets. A lower GWP alternative to R-134a had to be found and thus we have the new 1234yf. Use strips of foam to couple the two heat exchangers if necessary.B. Unfortunately, the oil only mixes with the refrigerant as a liquid. 4.R404A R134a increased mass transfer resistance to reduce the transmission chamber heat coefficient, while R507 heat transfer coefficient is higher than R404A. The good thing is that after you convert to R134 you can top off the system easily and cheaply. It is possible I have 10 ounces (250 ml) in the system. Don't like the sound of custom parallel condensor. R-12 is no longer used or produced in many countries and remaining quantities have skyrocketed in price. Make sure to get the R12 EXP valve if that is the way you go. The aux fan didn't switch on though and I didn't check the high side temperature. However, R12 refrigerants are still used as fire retardants in aircraft and submarines. What was the ambient when you took that reading?Jumpering the aux fan is a common thing here in the desert. 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!) Jun 19, 2007. 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. If the system was upgraded by a professional it should have an upgrade sticker. My turn to LOL - greasiesel! Break out the new gauges and measure hi and lo at 1500rpm, and do the Merc FSM test to see how we're doing performance wise. It's not just the poor performance - the cooling just stops working after a while. 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. Then, subtract that result by 0.25 pounds to get the proper amount of R134a charge. Use a drop light in the engine bay, and check the air path from the front of the car at night. I bought a relay to put on it connected to the compressor clutch. Can I just use an adapter and save $200? "Jerky Locker" LMAO I am using that one in the future!Florida = BUGS! A. Pressure/temperature table for R12, R134a, and R513A is shown in Figure 1. . The MB chart shows 360 psi with R12 in some conditions. Generally the system will be initially charged with approximately 80% to 85% of the original amount of R12, using R134a. If 50 degrees across the cond. $21 . What effect would it have on performance, if any?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. Fitting a PF condensor is not rocket science, but it requires some planning. Or is there always room for improvement, the more the merrier. By using a black light the dye will glow in areas where oil leaks are visible. Gain access to our free AOP (Ask a Professional) Section to get real answers for your questions. Rich Membership Chairman Using R134a in an R12 system will cause the oil not to move with the refrigerant, causing a system failure and probably won't even cool the system well, if at all. From memory, I put in at least 8 ounces of oil, probably around 10 ounces in there. BTW, I use a stick thermo in the vents and the laser on the condenser. July 3, 2022July 3, 2022. The general practice of charging the system with 15% less refrigerant adds to the thermal deficiency of R134a. So if the TXV is OK, and the too much oil situation is not a big problem, then I wonder why the compressor is switching off after about 15 minutes of cooling? Yes it will work with either Refrigerant! Its not that difficult but the procedures of evacuation, charging and testing should be done by a licensed a/c technician that is experienced with R134a and your particular car. It runs between the condenser outlet, receiver/drier unit and expansion valve at the firewall. The evap is hard to get at. Biggest you can fit in there is best. It won't be optimal, though. Blows pretty hard on full. There are significant differences between R12, R134a, and R513A, which must be considered when handling, processing, applying, or retrofitting with these refrigerants. Reattach the hose lines using new R134a compatible o-rings, lightly lubricate with compressor oil. But R22 is almost equally damaging. Figure 2 shows the different phases and pressures the refrigerant . R12 is used in several applications like low temperature, medium temperature, and high-temperature applications. Agram a retevis rt22 password i bastrop county district clerk records el material que oferim als nostres webs. R134a compressors are substituted as new to retrofit the R12 system compressor part numbers with different height sealing washers. Theres no problem with using R134a in a home air conditioning system because it is a hydrofluorocarbon that doesnt cause environmental harm. It's best to determine on a case-by-case basis while monitoring system pressures and output air temperature. Accessories Pumps, Cooling Towers, Evap Condensers, etc, Components Valves, Motors, Condensers, Evaporators, etc, Duct Systems Design, Installation & Practice, Piping Systems Design, Installation & Practice, Control System Design, Installation & Practice, Pro's Forum: National Electrical Code (NEC), Pro's Forum: Calculations & Electrical Theory, Pro's Forum: Electrical Business & Marketing. 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).
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