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The #1 question asked by NEW MEMBERS. The system has been previously converted to R-134a. difference between r12 and r134a expansion valve As R134A refrigerant has different operating characteristics and pressures this valve is not necesssry. Please enter the name by which you would like to log-in and be known on this site. Like say half a can or so recharge come springtime warm weather or something. R134a refrigerant is lighter than R12. These differences in the valve size can be attributed to the correlation of the cooling capacity with the enthalpy difference and the mass flow, which in . The cure is to use the newer R134a compressors is sealing washers that are different thickness. Remove the old mineral oil from the compressor by turning it upside down, side to side, and turn the front hub on the clutch assembly. Are r12 and r134 fittings different? Yes, the 50F diff (160-110F) on the condenser was at idle, and ambient was about 90F. What is a good differential? A slow loss of cooling at city speeds is usually related to condensor capacity & airflow issues.You could improve the cooling capacity by replacing the condensor with a high effeciency parallel flow unit. Unfortunately, the oil only mixes with the refrigerant as a liquid. of coiled cap tube on VCR system with R134a. The compressors used by refrigeration plants to compress gas require oil to help lubricate its moving parts. Replied by Rich928 on topic R12 or R134a. Below are the major differences between R134a and R12: The chemical composition of R12 and R134a differ. And, unfortunately a small high side pressure gauge on a short hose. The mechanical fan & clutch should be checked as well. R404a is a zeotropic blend with a temp glide , because of the mixture of 2 or more refrigerants. We say generally because the vehicle manufacturer may have a formula already worked out for the R134a conversion process. Neuro spine Super Speciality Clinic - Above Apollo Pharmacy, Bangarpet Circle, Kolar - Bangarpet Road, Kolar Town. 2022 nba 2k22 starting a fashion label signing the designer, a difference between r12 and r134a expansion valve, 2020 white paper of the church of pentecost, Chime Mobile Check Deposit Funds Availability, Why Does James Kill Donald In The Vanishing, nba 2k22 starting a fashion label signing the designer. Thomas Jefferson, Thanks,OK, I'm starting to feel a little better about it. With tube & fin condensors in MVAC applications there is never "too much" airflow. The first vehicle that used the R1234yf refrigerant was the 2013 Cadillac XTS. Lasers don't do well on vent temps, a stick thermometer is better in that application. Spray it deep, and let it sit for a few minutes. compressor, condenser, evaporator and expansion valve are specifically designed for use with R134a. A/C Expansion Valve Replacement Cost. 3 ounces? R134a is called tetrafluoroethane (HFC). . The pressure at low temperatures is nearly the same between 12 and 134a. But as there's not a big difference, people say you can suffice with either. Stability: RR12 doesnt disintegrate even under extreme operating conditions. shown for the parallel flow, aluminum condenser that is listed. The typical scenario here is when the car owner buys an inexpensive retro-fit kit from the local auto parts store. Make sure to wear safety gloves, goggles, and shoes when theres a possibility of exposure to the chemical (R134a). I'm putting r12 back in my system, but all of the valves I can for the application (1990 jeep grand wagoneer) say r134a on them. Measure what you have now.3) Go back to the page in step one, and find the largest condensor you can put in your vehicle. Welcome to rxmechanic.com. maintain the A/C of older cars. Warning: "continue" targeting switch is equivalent to "break".Did you mean to use "continue 2"? Inasmuch as R134a has a global warming potential thats over 1000 times more threatening than carbon dioxide, its better than R12. Recharge the compressor with a/c ester oil and a tracer dye. As per their results . After the system has been tested out it should be checked for leaks. _____ 2012 E350 2006 Callaway SC560 . There are two hoses listed, R-12 64-53-1-377-821 for $72.50, and R-134a 64-53-8-391-051 fro $262.50. The butylcellusolve or the citrus solvent will dissolve the carcass in a few minutes. Different correction factors are applied to other refrigerants. Dimensioning of refrigeration components - part 2 - Danfoss $21 . 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). Discussion in 'Technical' started by Jsarnold, May 25, 2012. It cycles on off in med (or low for that matter)Gotta tell ya. Jun 19, 2007. They can be mounted quite easy,and there is a mounting kit that helps to hang it. Helical and Serpentine coils. Quick View. By using a black light the dye will glow in areas where oil leaks are visible. To prevent refrigerant loss you should consider replacing your old hose lines with barrier type hose. R12 is simply too expensive for a 25+ year old A/C system. Hmmmm. difference between r12 and r134a expansion valve. Should I do the test again with the the aux fan jumpered? If the system was upgraded by a professional it should have an upgrade sticker. Where would I get some basic info on it, I know nothing about it. A capacity curve is shown in figure 2 for relative capacity of R134a vs. R12 for evaporating temperatures from 0F to 50F. Nick, I hear you - there maybe nothing to do here. 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. The ARPA Zone/Open Membership Discussion Forums. Trinary Pressure Switch quantity. The only difference I can imagine would be the recharge connection. The R134a compressor has a 1/8" step in on the high side port. and an evaporator core and expansion valve that are optimized for R134a . I think so. ThanksPaul -------------------------1983 Mercedes 240D on R12 and WVO!1192 Mercedes 300D 2.5 R134a1993 Toyota Pickup converted to R134a. If you find any of these conditions you will want to liquid flush (with dedicated AC flush solution) all the lines, condensers, evaporator (remove the expansion valve) before you proceed further. Shorting the plug for the refrigerant switch should run the fan when the compressor is on. An orifice tube is just a fixed nozzle that pisses refrigerant into the evaporator without any sort of feedback. The experimental values of C.O.P.H obtained with the R134a/ester charge were 20.2% As noted, measure up front as best as you can to get as close to the aftermarket dim. Some 1993 and older R12 systems aren't as 'compatible' as you'd think to switch over. In sum, R12 has done more bad than good. Look at where the lines will end up. Remember, being aluminum, they lower the temps better, and do not pass off as much heat to the radiator, which then makes it's job easier and lowers underhood temps (besides lowering vent temps inside the car). We mention using ester type refrigerant oil. (You must log in or sign up to reply here. On the other hand, R12 has a global warming potential of 10,910. This would be a custom install, there is no "drop-in" condensor upgrade for that car.Check for proper fan operation, and clean the air path on both the condensor & radiator. Theres no problem with using R134a in a home air conditioning system because it is a hydrofluorocarbon that doesnt cause environmental harm. Depending on which circuit diagram fits your car (cough, no vin list exists) you have either one or two switches controlling the aux fan. I found that in the..Maxposition on the control it will have the compressor running all the time. Swapping the components isnt a herculean task, but recharging the AC is a challenge. ~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446. The aux fan didn't switch on though and I didn't check the high side temperature. If the charge is low the compressor will cycle on/off in the max AC position. The only difference I can imagine would be the recharge connection. The general practice of charging the system with 15% less refrigerant adds to the thermal deficiency of R134a. Back in that era, my business associates drove those things, brand new, and maybe I should take my Cadillac instead, no they wouldn't be caught dead in a Caddy, people of our esteem should be driving an MB. If liquid refrigerant were to exit the evaporator. We've updated our forums!Click here to visit the new forum, Year: 1983Make: MercedesModel: 240DEngine Size: 2.4Refrigerant Type: R12Ambient Temp: 90Pressure Low: 35Pressure High: ?Country of Origin: United States, Hi, this is my first post, so please take it easy on the noob. Operating Pressure/Temperature Differences The pressure/temperature curves for R-1234yf and R-134a are very similar. Thread starter goldNSX; Start date 1 August 2009; Tagged . 05-25-2017 02:14 AM. Existing technology: R134a has been in use in the refrigeration industry for very many years, and theres so much information about the safe use of the product. #4. This drop can affect energy consumption since the plant will operate for a longer period or a larger plant will have to be installed. To bless the system the technician should attach a R134a sticker somewhere in the engine compartment to note the car is using R134a. 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. Bottom line, R134a simply doesn't cool as well as R12. Whether R134a performs as well as R12 in any given a/c system depends upon system components and the amount of R134a used. 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 global warming potential of R134a is 1430. 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. PDF COMPARISON OF Rl34a AND R12 REFRIGERANTS IN A VAPOUR - AIVC B. and recharged with mineral oil and 2.2 lbs R12. You can use the R134a retrofit capacity chart for this purpose. First, differences in physical properties: 1, insoluble R12 compressor oil is used (to reduce the lubricant) 2, dissolved sealing materials are used (resulting in refrigerant leakage) 3, easy to damp (so easy to internal . 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. July 3, 2022July 3, 2022. The problem with not being an expert is that you don't know what is important and what's not. Edited: Sat July 14, 2007 at 10:22 PM by fonebone. As an example, let's say the R12 charge specification is listed at 2 lbs. Amazon.com: 134a Valve Can I use the one for the R-12? R12 is heavier than R134a and has smaller molecules. asia pacific stevie awards 2021. gin, amaretto cocktail. Took me a while to figure that one out, and how to say that. When ever possible you should ask the technician to note the same information on your repair bill and keep a copy in your glove box for future reference. R134a is called tetrafluoroethane (HFC). This is because R134a. You are indeed 20% out of the OEM spec for cooling. They should be able to keep you comfortable on a long trip, but don't expect vent frost in 3 minutes or lesss.2) Too much oil can reduce cooling capacity, and the effect is not linear. Expansion Valve for R134a? | Team Chevelle When you add fluorescent tracer dye to with the refrigerant oil it helps to track down leaks that push oil out of the system. Most vehicles manufactured before 1993 have the R12 A/C system. Autor de l'entrada Per ; Data de l'entrada calexico west port of entry hours; 12 month libor rate 2021 a difference between r12 and r134a expansion valve a difference between r12 and r134a expansion valve Gnats & mosquitos will clog deep. gital control scheme. Once you have replaced the OEM condensor with a PF unit, you will need to make custom hoses to mate with your OEM system. how to get to disney springs from boardwalk / bb dakota plaid jacket canada / difference between r12 and r134a expansion valve. But as there's not a big difference, people say you can suffice with either. PDF Tecumseh Guidelines for Utilization of R134a Inhalation of vapor: Inhaling a large amount of R134a vapor can lead to drowsiness, temporary nervous system depression, and lethargy. 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. Related products. If your compressor requires replacement or its seals and o-rings need to be replaced due to leakage, it would be wise at this time to either obtain a compressor that has o-rings and seals that are compatible with R134a or have your unit re-manufactured with compatible components. This means that it has a high potential of causing depletion to the ozone layer.