Disconnect the two hose lines to the compressor, protect the ends from getting dirty. Paul -------------------------1983 Mercedes 240D on R12 and WVO!1192 Mercedes 300D 2.5 R134a1993 Toyota Pickup converted to R134a. Can I use the one for the R-12? The #1 question asked by NEW MEMBERS. With R12 you use to check to see if the site glass was full, if it had bubbles it meant you had a low charge. Is that why expansion valves are specific to R12 or R134A? Very nice! Flush with a garden hose - do not use a high pressure washer - you can bend the fins flat & damage the condensor.B. At the time I thought nothing of it, but now I am thinking maybe that is contributing to the system not working as well as it could. R134a requires a different oil. I don't recall all the details, but starts off with the largest parallel flow condenser and improved fans. CR4P). Look at where the lines will end up. 37 in 2005 tacoma, R134A. It is a haloalkane and hydrofluorocarbon (HFC) refrigerant that has thermodynamic properties, potential global warming for one hundred years, and insignificant ozone depletion. How is 1234yf different from . It is made up of carbon, hydrogen, and fluorine. R12 is heavier than R134a and has smaller molecules. Though - the valve for a 1991 says R12 on it, and for a 1994, it says R-134a. The system has been previously converted to R-134a. Heres R12 vs. R134a pressure chart. It does not "pool" to any degree in a large amount anywhere. Related products. That way I will have reduced the oil by about 1/3 (assuming the oil is mixed evenly through the system). He used thermostatic expansion valve and Capillary tube for analysis with R12. How about evacing 1 pound of refrig from the system, and then putting 1 lb of pure R12 back in? R12 is used in several applications like low temperature, medium temperature, and high-temperature applications. 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. Agram a retevis rt22 password i bastrop county district clerk records el material que oferim als nostres webs. 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. I cleaned the evap as best I could, if that is what you are getting at. For example, at an evap temp of 30 (your daughter's system is probably running around 25-28 saturated in order to give a 32 duct temp), the pressure of R-134a is 26.1psi. The oil is spread all over your system when it is at rest. . The only mechanical differences between an R12 system and an R134a system are that R134a systems typically have larger condensers and more powerful compressors. R134a compressors are substituted as new to retrofit the R12 system compressor part numbers with different height sealing washers. 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. Automotive Replacement Expansion Valves & Parts; Industrial & Scientific; Customer Reviews. These two refrigerants are the older types and are not used in newer refrigeration and air conditioning systems. 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. You'll want the expansion valve matched to whatever refrigerant you're using. 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. The major reason for the replacement of R12 with R134a was to curb future greenhouse effects. PaulJerky King -------------------------1983 Mercedes 240D on R12 and WVO!1192 Mercedes 300D 2.5 R134a1993 Toyota Pickup converted to 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. I think the way to go here is1. The difference between the two is about 10,000 btu/h. R12 or R134a - 928 Owners Club Forum Any advice appreciated. Putting R12 into a R134 vehicle | AnandTech Forums: Technology Ensure you contact a professional mechanic to do the work for you so you dont end up incurring more costs for yourself. But, if your old compressor has lock-up or if your current expansion valve is not functional it would wise to replace the expansion valve with a valve designed for R134a. Is there a graph? VerticalScope Inc. All Rights Reserved. There are other refrigerants: some of which may work, some of which dont work, some of which will destroy your a/c system and some of which are dangerous. A/C R12 to R134a Conversion Success | IH8MUD Forum Nice to use new gadgets! R134a compressors are substituted as new to retrofit the R12 system compressor part numbers with different height sealing washers. All fans must work at 100% of the OEM rating. Bookmarks: Digg; del . By using a black light the dye will glow in areas where oil leaks are visible. R12, on the other hand, is called chlorofluorocarbon (CFC). Then again, there are two different expansion valves. With tube & fin condensors in MVAC applications there is never "too much" airflow. leading to corrosion of expansion valves, capillary tube plugging, and compressor bearing . You can buy bulk hose, and the proper fittings, then have them crimped off the vehicle.Be sure that no air bypasses the new condensor on the way to the radiator. Make sure to get the R12 EXP valve if that is the way you go. Talk about what services you provide. The cable is adjustable at the valve arm. #4. Here are the basics for converting a system that does not have a charge of R12, its empty. ~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446. difference between r12 and r134a expansion valve Formula: (R12 Charge Specification x 0.9) - 0.25 lbs. Can I just use an adapter and save $200? 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. CONCLUSIONS The differences in the theoretical C.O.P.H calculated for R12 and R134a are consistent with values quoted in the literature. Plus, not releasing the chemical into the air is morally justifiable. R134a. R134a has a smaller molecule than R12 so R134a will leak out sooner than R12. . Edited: Sat July 14, 2007 at 10:22 PM by fonebone. The MB chart shows 360 psi with R12 in some conditions. 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. Moreso, it had been banned. System has been working fine for a year. What was the ambient when you took that reading?Jumpering the aux fan is a common thing here in the desert. We mention using ester type refrigerant oil. But with an R4, better too much than too little.3) A TXV optimized for 134a will be ok with R12.4) The airflow across the condensor is crucial to good performance. This chart has a column of ambient (outside) air temperatures on one side and a corresponding range of high side pressures on the other side. To bless the system the technician should attach a R134a sticker somewhere in the engine compartment to note the car is using R134a. I dont know why the cost difference between compressors is so huge, though. Production of R12 ceased in 1996, although it can still be reclaimed, purified, and resold, and small cans of New Old Stock R12 are still widely available on eBay and Craigslist. . leading to corrosion of expansion valves, capillary tube plugging, and compressor bearing . In addition, R134a refrigerants are not only used in auto air conditioners, they can be used in freezers, aerosol cans, and refrigerators. "Jerky Locker" LMAO I am using that one in the future!Florida = BUGS! absorb by the evaporator to insure all liquid refrigerant entering the evaporator. After the initial charge the system is then tweeked : you determine the optimum amount of refrigerant to match your system by monitoring the a/c outlet vent temperature and the high side pressure as you add or remove refrigerant. However, R12 refrigerants are still used as fire retardants in aircraft and submarines. Make sure to wear safety gloves, goggles, and shoes when theres a possibility of exposure to the chemical (R134a). However, the supply houses don't indicate a difference. BTW, I use a stick thermo in the vents and the laser on the condenser. Expansion Valve for R134a? | Team Chevelle I have one can left, so maybe a plan can be made. Is there a difference between a R134a expansion valve and an R12 TXV? and he synthesized R-134a in 1936, 5 years after R-12 was . R-12 vs R-134a Hose - Pelican Parts Forums Stopleak is also risky. As an example, let's say the R12 charge specification is listed at 2 lbs. The condensor airflow drops off as the fan clutch dies slowly. Not going to mess up your 'do, but you can feel it. An extra half ounce? Since there is only about a 10% difference between R-12 and R-134a, the expansion valve being self-compensating really doesn't make that much difference. Welcome to rxmechanic.com. Is that why expansion valves are specific to R12 or R134A? 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. A final difference is that most (though not all) R-1234yf cars will have a Suction Line Heat Exchanger. There is more to check.The evaporator must be clean as well as the condensor - was this a smoker's car?You should check the water control valve for the heater core. Als nostres webs oferimOne Piece,Doctor Who,Torchwood, El Detectiu ConaniSlam Dunkdoblats en catal. Then when it is switched off for a few minutes and then back on, the air cools again. R 134A is designed for the high demands of an automobile AC and cannot be used on refrigerators due to pressure differences. 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. We ALWAYS want to know the pressure readings! 30 deg is pretty coldSystems generally run between 40 and 43 deg. Components Coils, Heaters, Motors, etc. R12, on the other hand, is called chlorofluorocarbon (CFC). And by matching the correct amount of R134a to use in a given vehicle, correcting the superheat of the expansion valve (if necessary), you can in some manner nearly balance or match the amount of heat drawn out by the evaporator and released by the condenser. 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 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. _____ 2012 E350 2006 Callaway SC560 . So I probably put the highest suggested amount in to be safe. 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. This is a great space to write long text about your company and your services. The safe high side pressures are determined with a PT (pressures and temperatures) chart. In cases such as this, the required capacity value of the expansion valve with R134a is reduced by 30% (correction factor 1.42). Generally this works well for the whole system. The Main change in the system is the expansion valve. Once you have replaced the OEM condensor with a PF unit, you will need to make custom hoses to mate with your OEM system. 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. Some cars have both an engine coolant temp switch & a refrigerant temp switch, others only the refrigerant switch. R134a refrigerant fittings are different size. James10952001. It can be used applications like walk-in coolers, food and dairy display cases, domestic refrigerators, and beverage dispensers and vending machines. Spray it deep, and let it sit for a few minutes. Your old hoses of course will not fit. R12 and R22 are both now banned by the EPA in the United States. On the other hand, R12 has a global warming potential of 10,910. difference between r12 and r134a expansion valve Do a pre-inspection and then Evacuate (vacuum down) the system, the longer the evacuation the better but there is a point of diminishing return, 2-3 hours is generally very good. A comparison between R12 vs. R134a temperature will show that R12 has a higher temperature than R134a. difference between r12 and r134a expansion valve. -------------------------Just another brick in the wallHad a little mule I fed him castor oil and every time he jumped the fence he fertilized the soil, The older expansion valves were filled with the refrigerant they were used with, the replacement valves (today) are filled with a different chemical to work with both refrigerants..Hope this helps-------------------------ChickEmail: Chick---------------------------------------------Freedoms just another word for nothing left to lose, I believe the optimum supercool setting will vary slightly between an expansion valve for an R12, as compared to R134a, system. This refers to BTU's (heat) moved per pound of refrigerant moved. of coiled cap tube on VCR system with R134a. Just had knee surgery yesterday, so I"M not exactly hopping around too well. The current expansion valve is FF - 1/4 - C. Is it neccesary to replace this valve? Only show this user. That switch should close @ 52c. Since then, the industry standard has been R134a, which is an efficient replacement. 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. difference between r12 and r134a expansion valve Anyone know what happens when an R12 expansion valve is used in a system charged with R134A? 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.
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