The difference really shows up on the high side. Read on for more information about using automotive r134a in a refrigerator and vice versa. The cost of recharging the air conditioner is between $150 to $500. Can I just use an adapter and save $200? difference between r12 and r134a expansion valvewarning signs for a deteriorating patient with covid 19 infection 2022.07.03 18:36 18:36 You should keep in mind that recharging your air conditioner improperly could result in more serious damage. Yes, this was a smokers car. This can be very very expensive. sparkee said: Thanks for the Service Bulletin. Is that why expansion valves are specific to R12 or R134A? Inasmuch as R134a has a global warming potential thats over 1000 times more threatening than carbon dioxide, its better than R12. If you have the work done, be sure you find a true "A/C" shop that can make up lines. It didn't seem too dirty though - I don't think it is the problem, but I could be wrong. link to How to cut off a Catalytic Converter. 4.R404A R134a increased mass transfer resistance to reduce the transmission chamber heat coefficient, while R507 heat transfer coefficient is higher than R404A. 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. This works when the R12 charge specification is listed in pounds. It can be used applications like walk-in coolers, food and dairy display cases, domestic refrigerators, and beverage dispensers and vending machines. Theres no problem with using R134a in a home air conditioning system because it is a hydrofluorocarbon that doesnt cause environmental harm. $21 . and an evaporator core and expansion valve that are optimized for R134a . So if you car has a large amount of rubber hose, such as a 40 feet with the 911, then you will be re-charging the system often and that is expensive no matter which refrigerant you use. If he is not in the garage fixing challenging mechanical problems, he is writing automotive repair guides, buyers guides, and car and tools comparisons. I just got some hi/lo side gauges so I'm going to take readings, if they are needed. The catalytic converter is an essential component of your car's emission system that helps save the environment from harmful emissions. The pressure at low temperatures is nearly the same between 12 and 134a. Jun 19, 2007. Before we mentioned that you can add approximately 5-6 ounces of ester oil to the compressor. I'm just trying to help you avoid headaches in the long run. -------------------------"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." This means that it has a high potential of causing depletion to the ozone layer. If the charge is low the compressor will cycle on/off in the max AC position. A discussion of the relationship between valve capacities and superheat set-tings can be found in Bulletin 10-9. ThanksPaul -------------------------1983 Mercedes 240D on R12 and WVO!1192 Mercedes 300D 2.5 R134a1993 Toyota Pickup converted to R134a. ~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446. Some cars have both an engine coolant temp switch & a refrigerant temp switch, others only the refrigerant switch. But as there's not a big difference, people say you can suffice with either. The whole trick is to sit there in those steam boxes and not perspire, it's vulgar to perspire when driving on public roads.If you want esteem, drive an MB, if you want comfort with 60*F interiors in a 125*F environment, get a Caddy. The general practice of charging the system with 15% less refrigerant adds to the thermal deficiency of R134a. The system has been previously converted to R-134a. That is for the compressor, drier, expansion valve and condenser. difference between r12 and r134a expansion valve . in /nfs/c05/h04/mnt/113983/domains/toragrafix.com/html/wp-content . -------------------------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. In practice this means that the car can overheat and the aux fan will stay off! Then again, there are two different expansion valves. Depending on which circuit diagram fits your car (cough, no vin list exists) you have either one or two switches controlling the aux fan. But as there's not a big difference, people say you can suffice with either. It is common for eurocar threads to go multiple pages, and as Nick points out - sometimes cool is all you will ever get. Therefore, the R12 refrigerant is illegal, and emitting it is illegal. I put one in my old daily driver '79 Chevy tank (r-12), and it really made a difference. It has already been clearly stated that R12 is a chemical that damages the earths ozone layer and shouldnt be released into the environment no matter the circumstance. I cleaned the evap as best I could, if that is what you are getting at. Please enter a password for your user account. The condensor airflow drops off as the fan clutch dies slowly. Some 1993 and older R12 systems aren't as 'compatible' as you'd think to switch over. R-401b is the mixture by weight of 61% R22, 11% R-152a and 28% of R-124. We are an automotive mechanic blog that helps mechanics and car users to find the most recent and accurate technical and repair information for their cars. 3 ounces? June 21, 2022 difference between r12 and r134a expansion valve . 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. R12 is used in several applications like low temperature, medium temperature, and high-temperature applications. GWP is a measurement of Greenhouse Gases and their effect on Global Warming. and he synthesized R-134a in 1936, 5 years after R-12 was . 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. El juny de 2017, el mateix grup va decidir crear un web deDoctor Who amb el mateix objectiu. R-134a can actually cool better than R-12 in a well designed R-134a system as it has better thermoconductive properties, but all the high pressure issues have to be addressed.But even when these cars were brand new, didn't cool worth a damned, recall almost dying in one in Las Vegas at the time, but a good way to lose weight with gallons of perspiration pouring out, just don't let that drip on the seats, that is inappropriate. 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 pressure/temperature curves for R-1234yf and R-134a are very similar. 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 is called tetrafluoroethane (HFC). R12 and R22 are both now banned by the EPA in the United States. Crap! 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. 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. Condensers designed to release greater amounts of heat help to expel the greater amount of heat which R134a removes from the cars interior. Quick View. We chose to use 5-6 ounces of oil to be on the safe side: 3-4 ounces for the compressor, 1 oz of oil for the drier and another ounce of oil for system losses. The reason is that the vehicles, for instance, manufactured currently configure the engine for R1234yf refrigerant, making no provision for replacement. It cycles on off in med (or low for that matter)Gotta tell ya. I think the way to go here is1. . Yep, definately not a meat locker. 37 in 2005 tacoma, R134A. The smoking question & vent airflow indicate that the evaporator is fairly clean - and you are aware of the importance of that.The heater valve stops the flow, but there is always some conduction heating. Safety: R134a is safe to use as its non-flammable and cant explode. R12 systems used mineral oil, but unfortunately mineral oil doesn't dissolve in R134a. Helical and Serpentine coils. 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. 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. Components Coils, Heaters, Motors, etc. 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. Therefore, the higher the factor of the chemical (compound), the greater its effect on global warming. Usually, mechanics charge around $200 for conversion. You do not however need to replace all the o-rings or seals for a simple conversion, it is simply a logical thing to do when and if the time comes to work or replace certain components because of age issues. This refers to BTU's (heat) moved per pound of refrigerant moved. Related products. System has been working fine for a year. Took me a while to figure that one out, and how to say that. Can I just use an adapter and save $200? Look deep into the fins. R-12 is no longer used or produced in many countries and remaining quantities have skyrocketed in price. Expansion Valve. Safe but sorry! 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. Could that be screwing up the systems performance?Anyway, when I installed the system, the new TXV (is that short for expansion valve?) and he synthesized R-134a in 1936, 5 years after R-12 was . What is the refrigerant property involved that has caused this? As illustrated in the chart below, the curves below run together nearly throughout the curve, only slightly breaking paths at around 250 psig/150 degrees and above Flammability/Safety R-1234yf has been designated as MILDLY flammable. The newer valves and switches will work with both refrigerants. Recharge the compressor with a/c ester oil and a tracer dye. Also, since R134a uses synthetic oil, it has a low global warming potential, unlike R12 which uses mineral oil which poses a negative environmental impact. This implies that the discharge pressure of the compressor should be moderate so it can produce the refrigerants condensation in the condenser at the atmospheric temperature. There is a lot of differences between the R12 and the R134a fittings, you can't mistake them. In short, NO! The chemical composition of R12 and R134a differ. The difference between R12 and R134a TEV (exp valves) is primarily the 'superheat'. The only mechanical differences between an R12 system and an R134a system are that R134a systems typically have larger condensers and more powerful compressors. Best for varieties of operating conditions: Its boiling point is -21.6 Celsius. It's actually a reaction with chlorine in the mineral oil that may have been absorbed and leftover from the old R-12. This is because R134a. 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. By using a black light the dye will glow in areas where oil leaks are visible. Don't like the sound of custom parallel condensor. Just had knee surgery yesterday, so I"M not exactly hopping around too well. and feeds it through an expansion valve. Even though their common major function is to cool the system, they have many differences. 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. Its cylinders are colored white. An orifice tube is just a fixed nozzle that pisses refrigerant into the evaporator without any sort of feedback. A. Pressure/temperature plot of R134a vs. R12 is shown in figure 1. Biggest you can fit in there is best. In a car ac, using this type of freon 20 years ago was difficult. I don't believe it is but I had a service guy tell me it needs to be done. If you you dont have the free time to play then you are better off to pay a technician. -The amount of R-134a needed will typically be 80-90% of the R-12 charge. The compressors used by refrigeration plants to compress gas require oil to help lubricate its moving parts. If you are replacing other system components, such as condensers, driers or hoses, you may need to add more a/c refrigerant oil to the system. 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. Its chemical symbol is CH2FCF3. R134a is otherwise called 1,1,1,2 Tetrafluoroethane, Florasol 134a, Freon 134a, Norflurane (INN) or HFC 134a. The oil used in R12 systems is not compatible with R134a refrigerant. compressor, condenser, evaporator and expansion valve are specifically designed for use with R134a. R134a is called tetrafluoroethane (HFC). Only show this user. I don't have the FSM matrix handy for that 123.123, but a 123.133 shows a test rpm of 2,000 - and vent temps between 54f & 66f at 91f to 95f ambient. Thanks for the input. PaulJerky King -------------------------1983 Mercedes 240D on R12 and WVO!1192 Mercedes 300D 2.5 R134a1993 Toyota Pickup converted to R134a. The oil used in R12 and R134a are different and not compatible. Als nostres webs oferimOne Piece,Doctor Who,Torchwood, El Detectiu ConaniSlam Dunkdoblats en catal. One thing at a time here, and slowly, the knee is not up to jumping around like I used to at the moment. 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.