You can also check the Aux fan in your case. -------------------------"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." Rxmechanic.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for website owners to earn advertising fees by advertising and linking to Amazon.com. Do I leave the orignal condensor in, etc?Thanks. But, what is considered a good temperature differential across the condensor? 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. Debug the condensor (I am a computer nerd after all!)3. 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. This leads me to labor over every small decision. R12 and R134 are of different chemistry. Can I just use an adapter and save $200? a 50f delta across the condensor is good, but I suspect that is an idle reading. I have just bought gauges. R134a has a smaller molecule than R12 so R134a will leak out sooner than R12. difference between r12 and r134a expansion valve. This is because R134a. Besides, its technology has been tested and trusted. This may be the source of your oil confusion. It can be used applications like walk-in coolers, food and dairy display cases, domestic refrigerators, and beverage dispensers and vending machines. Use strips of foam to couple the two heat exchangers if necessary.B. Besides R134a there are some other refrigerants that are approved to replace R12 and there is a long list of refrigerants that are not approved. Refrigerators generally utilize R22, R32, or 410A-based coolants as their cooling agent. Discussion in 'Technical' started by Jsarnold, May 25, 2012. Is there a source of valves by, say, eaton number? Paul -------------------------1983 Mercedes 240D on R12 and WVO!1192 Mercedes 300D 2.5 R134a1993 Toyota Pickup converted to R134a. So the steps involved are cleaning out the old oil, replacing all the O-rings, replacing the dryer, replacing the expansion valve, and converting the high and low side connectors from Schrader to quick connect valves. Instead, top off R12 with R134a refrigerant. According to Wikipedia, There is such a thing as "r132a" (1,1-Dichloro-2,2-Difluoroethane), however there is no indication of it being a commercially produced refrigerant. R134a requires the use of synthetic oil! R12 is used in several applications like low temperature, medium temperature, and high-temperature applications. It is usually sold under the brand name, Freon 12. They plug all the time. Most importantly, the oil used in the plant must always be compatible with the refrigerant used. So to keep things simple and to avoid controversy and politics we have R134a. we convert older systems where i work all the time and they work fine. _____ 2012 E350 2006 Callaway SC560 . Some cars have both an engine coolant temp switch & a refrigerant temp switch, others only the refrigerant switch. For R12, its mineral oil. R12 is CFC: Even though R12 is one of the most commonly used refrigerants, it is CFC. R404a is a zeotropic blend with a temp glide , because of the mixture of 2 or more refrigerants. The oil used in R12 systems is not compatible with R134a refrigerant. If he is not in the garage fixing challenging mechanical problems, he is writing automotive repair guides, buyers guides, and car and tools comparisons. Before we mentioned that you can add approximately 5-6 ounces of ester oil to the compressor. 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. The cure is to use the newer R134a compressors is sealing washers that are different thickness. About four or five years ago, I guy with an MB came here with the same problem, that tread was over six pages long. R12 is heavier than R134a and has smaller molecules. How about evacing 1 pound of refrig from the system, and then putting 1 lb of pure R12 back in? Or is there always room for improvement, the more the merrier. . R404a for freezing of product. As R134A refrigerant has different operating characteristics and pressures this valve is not necesssry. Any suggestions, or do you need to know the hi/lo readings? 4.3 out of 5 stars 491. We, the Rxmechanic team, have presented a well-detailed comparison of R134a vs. R12. The expansion valve is designed so that the temperature of the refrigerant at the evaporator outlet must have 8 to 12F (4 to 7C) of superheat before more refrigerant is allowed to enter the evaporator. The oil is spread all over your system when it is at rest. He used thermostatic expansion valve and Capillary tube for analysis with R12. It's helluva humid and hot here in north florida, and I drive around all day for my job. We consider the the various types alternative refrigerants that are illegal or not approved to be in two sectors: non-flammables and flammables. However, you can convert R12 to R134a by yourself, save money and keep all the tools purchased. It won't be optimal, though. Yes, the 50F diff (160-110F) on the condenser was at idle, and ambient was about 90F. Are r12 and r134 fittings different? 30 deg is pretty coldSystems generally run between 40 and 43 deg. . Generally, the new amount is 75-85% of the quantity advised by the manufacturer. Heres some important advice Whenever you notice your R12 refrigerant is leaking, turn off all flames and open the doors so it can escape to the open atmosphere. Since the hose is the stock hose, you cannot tell what refrigerant is inside. The analysis focuses on Coefficient of Performance for . George Bray on Wed August 31, 2005 5:03 PM I believe the optimum supercool setting will vary slightly between an expansion valve for an R12, as compared to R134a, system. Bad Car A/C Expansion Valve Symptoms. 2) Frost on the Vents. Please enter a password for your user account. 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. This drop can affect energy consumption since the plant will operate for a longer period or a larger plant will have to be installed. They would then make short "jumper hoses" to connect to the existing stock hoses, refit your old fan if there is a "pusher" fan, and recharge to specs. difference between r12 and r134a expansion valve why is miles raney not on homestead rescue June 21, 2022. manila mayor candidates 2022 -------------------------"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." June 21, 2022 difference between r12 and r134a expansion valve . That would be the "black death" syndrome. Since then, the industry standard has been R134a, which is an efficient replacement. Make sure to get the R12 EXP valve if that is the way you go. 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. Edited: Sat July 14, 2007 at 10:22 PM by fonebone. Then, subtract that result by 0.25 pounds to get the proper amount of R134a charge. Low refrigerating effect per pound: In comparison to other refrigerants, the refrigerating effect of R12 per pound is low. 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. Answer: OK, I'll bite. Its duty is to convert toxic gasses produced by the engine into A brake cleaner is a powerful solvent for cleaning dirt from the brakes and other car components. Since 2010, all home AC systems manufactured use a refrigerant like R134a that has zero ozone depletion potential (ODP). The catalytic converter is an essential component of your car's emission system that helps save the environment from harmful emissions. If it splashes inside the eye, it could lead to a serious eye problem. 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. Therefore, the higher the factor of the chemical (compound), the greater its effect on global warming. Your old hoses of course will not fit. The evap is hard to get at. I'm not sure. The R134a compressor has a 1/8" step in on the high side port. It is a haloalkane and hydrofluorocarbon (HFC) refrigerant that has thermodynamic properties, potential global warming for one hundred years, and insignificant ozone depletion. With R-12, 30 is 28.4psi and 40 is 36.9psi, for a difference of 8.5psi. Look at where the lines will end up. Boiling Point: R134a refrigerants boiling point is -26.3C (-15.34F). At least you do not have 16 ounces in there ( yup seen it before).For now, straighten all of the fins that you can, clean the condensor well, and re-test with the aux fan running. 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. If you're getting a R134a compressor, might as well finish the job - replace the receiver/dryer, flush everything else, and convert to R134a anyhow. "Jerky Locker" LMAO I am using that one in the future!Florida = BUGS! Further production of R12 was banned in some developed countries by the Montreal Protocol because of its harsh effect on the ozone layer. I'm thinking I might have put too much oil in the system - everywhere i read had a different amount - the manufacturer of the compressor, the MB factory service manual, online forums. RULES for AOP - Owner Assistance and Contractors, Energy Efficiency and Building Performance Discussion NEW, Carnak Zone/Locked Areas - For Professional Member Only, How To Become a Pro and Rules For Pro Members, Pro Forum: Refrigerants and EPA regulations **NEW, Pro Forum: Residential Refrigeration and Appliances **NEW, Pro Forum: Equipment Recalls and Bulletins **NEW, Pro's Forum: Building Science Discussions, Educational Forums - Open for all in the industry, Welcome to HVAC-Talk's Educational Forums, How to Submit Links, Articles and Quiz Questions, Frequently Asked Questions About Submissions, Physics, Thermodynamics, Fluid Flow and Combustion, Educational, Training & Reference Information, Manufacturer's Technical Information Links, Electrical Theory, Circuits and Electronics, HVACR Equipment, Components & Accessories, Accessories Humidifiers, Air Cleaners, HRUs, Fans, Filters, etc. Can I use the one for the R-12? Therefore, its most suitable for both commercial and domestic environments. We've updated our forums!Click here to visit the new forum, Year: 1991Make: Jaguar Model: XJ6Engine Size: 4.0. 5) A/C System Failure. 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. I put in a new (not reman) compressor (R4 I believe it is) in my merc 240D, new drier, new expansion valve, new o-rings, nylog. As noted, measure up front as best as you can to get as close to the aftermarket dim. Its chemical symbol is CH2FCF3. This is an electronic tool that sucks in air through a tube and across a sensor. Thread starter goldNSX; Start date 1 August 2009; Tagged . If liquid refrigerant were to exit the evaporator. I put one in my old daily driver '79 Chevy tank (r-12), and it really made a difference. By after changing just about everything, he got what was termed, satisfactory cooling. 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. The pressure/temperature curves for R-1234yf and R-134a are very similar. look at the difference! R134a is the most widely accepted alternative automotive refrigerant used to replace R12. All fans must work at 100% of the OEM rating. Operating Pressure/Temperature Differences The pressure/temperature curves for R-1234yf and R-134a are very similar. I don't believe it is but I had a service guy tell me it needs to be done. 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. Attach the R134a charge port adaptors, there are two types.. one of which you need to remove the old R12 valve cores. The aux fan seems to be working fine - it switches on occassionally. Though I have seen em run as cold as 12 deg F. If the thermo switch is malfunctioning. One thing at a time here, and slowly, the knee is not up to jumping around like I used to at the moment. R134a has a smaller molecule than R12 so R134a will leak out sooner than R12. Thus, when the system is running, condensing the CO2 is not a problem. El maig de 2016, un grup damics van crear un lloc web deOne Piece amb lobjectiu doferir la srie doblada en catal de forma gratuta i crear una comunitat que inclogus informaci, notcies i ms. R134a Refrigerant Recharge Kit with BPV31 Bullet Piercing Valve and R134a Quick Coupler, R134a/R-12/R-22 Freon Refrigerant Hose Can Tap Kit for A/C System - Easy to use. It won't be optimal, though.On some/many valves, you can adjust them, but that might make matters worse unless you really know what you're doing (which I don't!).RegardsGeorge. I'm doing one thing at a time so I know what the cause was. To prevent refrigerant loss you should consider replacing your old hose lines with barrier type hose. and he synthesized R-134a in 1936, 5 years after R-12 was . 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. Inasmuch as R134a has a global warming potential thats over 1000 times more threatening than carbon dioxide, its better than R12. Mark Baker R-401b is the mixture by weight of 61% R22, 11% R-152a and 28% of R-124. R12 was once used in many air conditioning units as a refrigerant or cooling agent. Sense ells no existirem. Unfortunately, the R12 refrigerant doesnt always blow cold air. R134a and R12 are both refrigerants used in vehicle air conditioning systems. Is checking the temperature of the in and out of the condensor not the easiest way to tell if it is doing a good job or not? R12 and R22 are both now banned by the EPA in the United States. The MB chart shows 360 psi with R12 in some conditions. Even if the system leaks, repairing the leaks and recharging it with R-12 is usually the best repair alternative. Expansion Valves Catalog E-1, July 2012. had writing on the side that said R134a. In no particular order, here's what I've found out regarding answering the questions posed so far:Fonebone - It is definitely an R4 compressor (they left the c off the front and the p off the end, i.e. R-12 - yellow R-134a - light blue R-22 - green R-402A - light brown (sand) R-402B - olive R-404A - orange R-407C - medium brown R-410A - rose R-507 - teal J Originally Posted by goldNSX. You do not want to exceed the systems high side recommendations. Most of all the differences gravitate to longevity, functionality, and safety. If the water valve is not closing all the way you will have re-heating of the cabin air.The cabin blower was not exactly a powerhouse - it was rated at 200w. The only difference I can imagine would be the recharge connection. It is a known suspect that lets heat into the heat exchanger/core even when off because the mono-valve is on the exit side of the heater core. I don't recall all the details, but starts off with the largest parallel flow condenser and improved fans. difference between r12 and r134a expansion valve . Compressor. R12, on the other hand, is called chlorofluorocarbon (CFC). . Disconnect the two hose lines to the compressor, protect the ends from getting dirty. Took me a while to figure that one out, and how to say that. Just because the radiator does not boil people assume that the cooling system is ok. R134a and water have the same abilities to change the state but R134a can do this more rapidly and at a much lower temperature than water. . However, R134a is better than R12. Mine was 61, so the system is not working as it is supposed to.
difference between r12 and r134a expansion valve
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