difference between r12 and r134a expansion valve difference between r12 and r134a expansion valve

Though I have seen em run as cold as 12 deg F. If the thermo switch is malfunctioning. Recomanem consultar les pgines web de Xarxa Catal per veure tota la nostra oferta. Attach the R134a charge port adaptors, there are two types.. one of which you need to remove the old R12 valve cores. Is that why expansion valves are specific to R12 or R134A? R12 is simply too expensive for a 25+ year old A/C system. 3) A TXV optimized for 134a will be ok with R12. Put a relay on the compressor clutch to the aux fan (I like that idea - makes a lot of sense)How does that sound? We suggest dumping the old refrigerant oil in a clean container and inspect the oil for sludge or waxing (old oil that has gelled) and contamination (metal particles). I don't recall all the details, but starts off with the largest parallel flow condenser and improved fans. He used thermostatic expansion valve and Capillary tube for analysis with R12. R404a for freezing of product. Edited: Tue July 17, 2007 at 3:25 AM by bohica2xo, I believe there is only one switch - the refrigerant switch. 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. When I compare parts, 93 uses one part number and 94 has a different part number. Agram a retevis rt22 password i bastrop county district clerk records el material que oferim als nostres webs. The larger fitting goes on the discharge port and the smaller fitting goes on the suction line or compressor inlet / suction port. How is the vent airflow?I would jumper the aux fan & check the performance. Flush with a garden hose - do not use a high pressure washer - you can bend the fins flat & damage the condensor.B. Some 1993 and older R12 systems aren't as 'compatible' as you'd think to switch over. I think the way to go here is1. Just had knee surgery yesterday, so I"M not exactly hopping around too well. What is usually sniffed are all the connections in the system: hoses and compressor, condenser, drier, expansion valve and evaporator fittings. Concentration level: The R134a vapor dilutes the oxygen concentration in the air to a low level, thereby causing harm. Further production of R12 was banned in some developed countries by the Montreal Protocol because of its harsh effect on the ozone layer. And yes - expansion valves sometimes need replacing if they are sticky - but a proper AC flush should eliminate the need for a new one if it's already in good condition. This allows the refrigerant in the condenser to be void of oil particles. This is 11F off the FSM performance graph - vent should be around 50F. 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. R12, on the other hand, is called chlorofluorocarbon (CFC). I cleaned the evap as best I could, if that is what you are getting at. 42 (at best) w/ 134A in 2000 isuzu trooper. 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. Tamb oferim en VOSC el contingut daquestes sries que no es troba doblat, com les temporades deDoctor Who de la 7 en endavant,les OVA i els especials de One Piece i molt ms. A/C receiver difference between R12 and R134a? . ~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446. The most common influences which effect the capability of R134a to perform well are the condenser, in some cases the the superheat setting of the expansion valve or the amount of R134a. R12 systems used mineral oil, but unfortunately mineral oil doesn't dissolve in R134a. 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. Table 1 summarizes the technical characteristics of three potential R134a alternatives. The original expansion valves work very well with 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. And, unfortunately a small high side pressure gauge on a short hose. 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. Crap! Miscibility with oil: R12 can be mixed with the compressor oil no matter the operating condition. 10,000BTU conduction heating? When you add fluorescent tracer dye to with the refrigerant oil it helps to track down leaks that push oil out of the system. Trinary Pressure Switch $ 39.99. A discussion of the relationship between valve capacities and superheat set-tings can be found in Bulletin 10-9. You should keep in mind that recharging your air conditioner improperly could result in more serious damage. Even with proper fan operation, missing seals & air dams can effect condensor effeciency. I've got a ball valve I'm going to put in the coolant line before the coolant goes through the firewall to the core. #19. The bad thing is I don't know what to do about it. don't know enough about the subject to explain the choices.However, a few days ago I called the dealer to see about an OEM TEV and they said something that made me feel a little bit better; the same part number superceded every application back to the '60s, and that they couldn't do that without engineering signing off on it.Still, I would feel a lot better if I could see something written officially that compared the flow characteristics and performance of r12 and 134a TEVs are concluded that they were interchangeable in automotive applications.If someone knows of such a document I would sleep much better!Walt Edited: Mon September 12, 2005 at 8:13 PM by wamcneil. The R134a compressor has a 1/8" step in on the high side port. At this point it is time to make an appointment with the a/c shop. The pressure/temperature curves for R-1234yf and R-134a are very similar. It slowly gets warmer and warmer in the car, even at highway speeds. 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. Please enter the name by which you would like to log-in and be known on this site. Vent temperatures slowly go down to around 50F with hi speed driving. It is made up of carbon, hydrogen, and fluorine. You can spend long evenings reading about the differences between the two refrigerants. In this study, without the need for major modifications to the bus air conditioner, the variation of the ejector dimensions according to different parameters has been investigated in the case of using the R1234yf, R1234ze(E), or R600a refrigerants, which may be a substitute for R134a as a refrigerant due to . Als nostres webs oferimOne Piece,Doctor Who,Torchwood, El Detectiu ConaniSlam Dunkdoblats en catal. 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. 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. . R134a is called tetrafluoroethane (HFC). Answer: OK, I'll bite. As noted, measure up front as best as you can to get as close to the aftermarket dim. Its chemical symbol is CH2FCF3. The adjusted tension of this spring is the determining factor in the opening and closing of the expansion valve. R12 was once used in many air conditioning units as a refrigerant or cooling agent. Like say half a can or so recharge come springtime warm weather or something. 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. Heres R12 vs. R134a pressure chart. I have one can left, so maybe a plan can be made. Unfortunately, the oil only mixes with the refrigerant as a liquid. On this website we are addressing only R134a and not other suggested drop in replacements. Below are the major differences between R134a and R12: Chemistry The chemical composition of R12 and R134a differ. Generally, the new amount is 75-85% of the quantity advised by the manufacturer. 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 substitute that we used for R-12 was the new HFC called R-134a. There is only a temperature switch on these cars as far as I recall, and it just switches on the aux fan. One thing at a time here, and slowly, the knee is not up to jumping around like I used to at the moment. Comparatively, larger R134a molecules should take more space, and a smaller amount might be required. You do not need to replace every o-ring in the system, but if you happen to open a connection that has an o-ring you should replace the old o-ring with one that is compatible with R134a and lubricate the o-ring with ac oil. Replied by Rich928 on topic R12 or R134a. Stopleak is also risky. If the system was upgraded by a professional it should have an upgrade sticker. 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. Poc temps desprs van decidir unir els dos webs sota el nom de Xarxa Catal, el conjunt de pgines que oferirien de franc sries doblades i/o subtitulades en catal. $21 . CONCLUSIONS The differences in the theoretical C.O.P.H calculated for R12 and R134a are consistent with values quoted in the literature. By: james smith underoath; Comments: 0 . link to How to cut off a Catalytic Converter. The typical scenario here is when the car owner buys an inexpensive retro-fit kit from the local auto parts store. I remember I had the wrong seals and it leaked some oil, so I put some more in.Bohica - I tested the pressures. You may need to adjust the valve in a bit to get desired superheat. The crossover point is approximately at 64F. So, instead of using R12, other better options include R401b, R134a, R401a, etc. Theres no problem with using R134a in a home air conditioning system because it is a hydrofluorocarbon that doesnt cause environmental harm. We mention using ester type refrigerant oil. The problem with using an approved alternative refrigerants other than R134a is that when the system is serviced it requires certain types of fittings, labels and dedicated equipment. 2) Frost on the Vents. Osuagwu Solomon is a certified mechanic with over a decade of experience in the mechanic garage, and he has over five years of experience in the writing industry. I had a 1991 BMW switched to 134a by just changing the low pressure charging valve, flushing and refilling with 134 (maybe with 10% . R12, on the other hand, is called chlorofluorocarbon (CFC). R12, on the other hand, has an ozone depletion potential of 1, implying that it can damage the ozone layer. 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. James10952001. 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 . With that said, I would source the TXV from another source such as NAPA just to avoid any problems. A vacuum pump, a refrigerant recover system, quality service gauge set with both low and high side gagues, and much more besides the lessons to learn what to do and what not to do. This kit comes complete with Expansion valve, o-ring kit, and 1ft. . difference between r12 and r134a expansion valve. Next I'll jumper the aux fan. In short, NO! 2001-2023 Griffiths Technical Inc. All Rights Reserved. It cycles on off in med (or low for that matter)Gotta tell ya. 1) Look Here at the available sizes of PF condensors.2) Go look at your vehicle's condensor & mounting. 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. This would become an expensive investment for a repair or service station to have unique dedicated equipment for every type of alternative refrigerant. In the automotive world, the replacement for R12 was R134a. Refrigerators generally utilize R22, R32, or 410A-based coolants as their cooling agent. R134a has an ozone depletion potential of 0, implying that it has a slight effect on the ozone layer. ~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446. Compressor. An extra half ounce? Besides, R134a refrigerant was manufactured after R12 was banned to help reduce the harshness of the old chemical (R12) on the ozone layer. This can be very very expensive. Recharge the compressor with a/c ester oil and a tracer dye. 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. In sum, R12 has done more bad than good. The #1 question asked by NEW MEMBERS. BTW, I use a stick thermo in the vents and the laser on the condenser. What effect would it have on performance, if any? Related products. -------------------------1983 Mercedes 240D on R12 and WVO!1192 Mercedes 300D 2.5 R134a1993 Toyota Pickup converted to R134a, Hi pdrayton- If you can remember the oil capacity that you found in all your research and post that, then bohica and others can have a better idea if you have too much; see if you can find that info! R12 Expansion Valve = 201 830 06 84 R134A Expansion Valve = 201 830 04 84 Is there a difference after all? Kommentare . I don't believe it is but I had a service guy tell me it needs to be done. So to keep things simple and to avoid controversy and politics we have R134a. It is made up of carbon, hydrogen, and fluorine. Pray I can let some oil out of the compressor without losing my precious R12. The Main change in the system is the expansion valve. 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. 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. CR4P). |. 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. _____ 2012 E350 2006 Callaway SC560 . Some compressor manufacturers or OEMs suggest PAG type oil for R134a. The safe high side pressures are determined with a PT (pressures and temperatures) chart.