difference between r12 and r134a expansion valve

Vent temperatures slowly go down to around 50F with hi speed driving. Thomas Jefferson, Thanks,OK, I'm starting to feel a little better about it. I have a laser temp reader, and it says the temps going into the condensor are up to 160F - coming out it is always around 110 or so. This may be the source of your oil confusion. R134a was selected as a replacement refrigerant for R12 because R12 contains chlorine and has a major effect to ozone layer depletion. Stay home and grill your own steaks and stir your own martini. Before R12 was replaced with R134a in 1995, it was mostly used in trucks and cars. -------------------------"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." Yes, the 50F diff (160-110F) on the condenser was at idle, and ambient was about 90F. Theres no problem with using R134a in a home air conditioning system because it is a hydrofluorocarbon that doesnt cause environmental harm. PDF COMPARISON OF Rl34a AND R12 REFRIGERANTS IN A VAPOUR - AIVC I've straightened the fans I can and sprayed simple green on it, let it soak then hosed it down well. The higher the ambient temperature the higher the high side pressure. The approval is very legal one, governed by the U.S. EPA. Thanks again. R134a is otherwise called 1,1,1,2 Tetrafluoroethane, Florasol 134a, Freon 134a, Norflurane (INN) or HFC 134a. One thing at a time here, and slowly, the knee is not up to jumping around like I used to at the moment. In practice this means that the car can overheat and the aux fan will stay off! Typically 5 to 6 ounces of a/c oil is adequate but this may vary depending upon the car. 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. MB has specfic test parameters for performance, but you can always test at max load - doors open fan on highest speed.The oil overcharge looks like a parabolic curve. difference between r12 and r134a expansion valve. You should keep in mind that recharging your air conditioner improperly could result in more serious damage. The R134a compressor has a 1/8" step in on the high side port. 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. That's a lot isn't it? = R134a Charge Level. Please enter a valid email address for yourself. A. Pressure/temperature table for R12, R134a, and R513A is shown in Figure 1. . system of 0.33 TR and refrigerant used was R12. R134a refrigerant is about 10% less efficient in moving heat than R12! R12 Expansion Valve with R134A charge? - Maverick R134a and R12 are among the most popular types of refrigerants. I am ordering new parts, and planning to convert my system to R-134a. . The system has been previously converted to R-134a. They examined the two configurations of capillary tubes i.e. Trinary Pressure Switch $ 39.99. Carefully study the chart and compare the following: To a large extent, the choice is up to you. 37 in 2005 tacoma, R134A. Superheat you can consider to be the additional amount of heat. How an A/C Expansion Valve Works. About four or five years ago, I guy with an MB came here with the same problem, that tread was over six pages long. 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. Thus, when the system is running, condensing the CO2 is not a problem. CLUTCH CYCLING SWITCH. BTW, I use a stick thermo in the vents and the laser on the condenser. Bottom line, R134a simply doesn't cool as well as R12. Does it matter - assuming both are new & uncontaminated? A/C Expansion Valve Replacement Cost. AC R12 to R134A Conversion | MR2 Owners Club Forum 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. Here are the basics for converting a system that does not have a charge of R12, its empty. Moreso, it had been banned. in /nfs/c05/h04/mnt/113983/domains/toragrafix.com/html/wp-content . I'm going to check the condensor is way clean too. Neuro spine Super Speciality Clinic - Above Apollo Pharmacy, Bangarpet Circle, Kolar - Bangarpet Road, Kolar Town. R-12 is no longer used or produced in many countries and remaining quantities have skyrocketed in price. Generally, the new amount is 75-85% of the quantity advised by the manufacturer. Disconnect the two hose lines to the compressor, protect the ends from getting dirty. 5) A/C System Failure. 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 You'll want the expansion valve matched to whatever refrigerant you're using. This would become an expensive investment for a repair or service station to have unique dedicated equipment for every type of alternative refrigerant. 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. 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. So, instead of using R12, other better options include R401b, R134a, R401a, etc. and he synthesized R-134a in 1936, 5 years after R-12 was . The major reason for the replacement of R12 with R134a was to curb future greenhouse effects. The P H and T cond,sat of the HR12 at a T oa of 40 C were higher than that of the R134a, resulting in a higher P e than that for the R134a. R12, on the other hand, is called chlorofluorocarbon (CFC). shown for the parallel flow, aluminum condenser that is listed. Paul:It is never a waste of my time to chat with someone that understands the problem, and wants to fix it. Answer: OK, I'll bite. 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. 30 deg is pretty coldSystems generally run between 40 and 43 deg. Bohica, I appreciate your help with this. We consider the the various types alternative refrigerants that are illegal or not approved to be in two sectors: non-flammables and flammables. I had a pair on my SAAB that seemed ok - but new ones ran 20% faster!Your best clue to airflow issues is a 60 mph test. Helical and Serpentine coils. Performance doesn't seem to have improved. The next piece of equipment to track down leaks is a leak sniffer. Took me a while to figure that one out, and how to say that. The larger fitting goes on the discharge port and the smaller fitting goes on the suction line or compressor inlet / suction port. When the temperature is reduced to-7C or below, the plants ability to cool the airdrops significantly. R134a has a smaller molecule than R12 so R134a will leak out sooner than R12. It won't be optimal, though. R134a requires the use of synthetic oil! R12, on the other hand, is called chlorofluorocarbon (CFC). The compressors used by refrigeration plants to compress gas require oil to help lubricate its moving parts. I'm also thinking maybe I should go to R134 - it might work better with the right amount of oil and the correct expansion valve. R12 is used in several applications like low temperature, medium temperature, and high-temperature applications. They have no moving parts. They can be mounted quite easy,and there is a mounting kit that helps to hang it. The cure is to use the newer R134a compressors is sealing washers that are different thickness. R404a is a zeotropic blend with a temp glide , because of the mixture of 2 or more refrigerants. 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. But some types of PAG do not mix well with the old residual R12 mineral oil left in the system components whereas ester does mix very well. Can I order a valve based on the original eaton number? -------------------------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! Hence, the effect of R12 on global warming is up to 10,000 times higher than carbon dioxide. The bad thing is I don't know what to do about it. 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. Further production of R12 was banned in some developed countries by the Montreal Protocol because of its harsh effect on the ozone layer. Its chemical symbol is CH2FCF3. It may take a couple of tries to get things really clean.The laser is usually close on clean surfaces, but I prefer a T/C. Expansion valves are an active device, they regulate the flow of refrigerant to the evaporator depending on evaporator temperature. But, what is considered a good temperature differential across the condensor? It is made up of carbon, hydrogen, and fluorine. Also, if you want to know what happens if you put R134a in an R12 system, you should first confirm if the R12 system can be replaced or if the refrigerants can be mixed. (On firewall where A/C lines go into cab.) System has been working fine for a year. The global warming potential of R134a is 1430. 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. 3) A TXV optimized for 134a will be ok with R12. 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. 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. As R134A refrigerant has different operating characteristics and pressures this valve is not necesssry. The pressure/temperature curves for R-1234yf and R-134a are very similar. difference between r12 and r134a expansion valve Mine was 61, so the system is not working as it is supposed to. Just because the radiator does not boil people assume that the cooling system is ok. Tech Talk - Differences between R-1234yf and R-134a - FJC Inc The experimental values of C.O.P.H obtained with the R134a/ester charge were 20.2% The general practice of charging the system with 15% less refrigerant adds to the thermal deficiency of R134a. 4) Inconsistent Airflow. Thanks so much Bohica - you've save me many more hours of fruitless speculation. 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. 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. Minor adjustments to the expansion valve and other controls may be necessary for some plans. Edited: Sat July 14, 2007 at 10:22 PM by fonebone. R12 or R134a - 928 Owners Club Forum The condensor airflow drops off as the fan clutch dies slowly. Also, it can be used with all types of compressors. How to Convert R12 to R22 | eHow 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. You may need to adjust the valve in a bit to get desired superheat. The crossover point is approximately at 64F. -------------------------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. 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. difference between r12 and r134a expansion valve 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. To prevent refrigerant loss you should consider replacing your old hose lines with barrier type hose. 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. You are indeed 20% out of the OEM spec for cooling. R134a and R12 are both refrigerants used in vehicle air conditioning systems. 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. All fans must work at 100% of the OEM rating. Dimensioning of refrigeration components - part 2 - Danfoss So that indicates it is cooling well there doesn't it? Skin contact: If the R134a (liquid) comes in contact with your skin, it could cause a burn. What is usually sniffed are all the connections in the system: hoses and compressor, condenser, drier, expansion valve and evaporator fittings. Yes, this was a smokers car. R-134A has a slightly lower pressure at evaporator temperatures (30-40 degrees), but R-134a also has a much higher pressure at condenser temperatures (120-150 degrees).

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