Since you will be using less R134a than R12 you do not want to rely on the driers site glass to determine if the system is full. Hot coolant migrates up through the core by convection (is that the word? -------------------------"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." Bottom line, R134a simply doesn't cool as well as R12. It can be used applications like walk-in coolers, food and dairy display cases, domestic refrigerators, and beverage dispensers and vending machines. Then, subtract that result by 0.25 pounds to get the proper amount of R134a charge. 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. R404a is a zeotropic blend with a temp glide , because of the mixture of 2 or more refrigerants. At 40, it is 35psi, which is a difference of 8.9psi. I have some experience with auto a/c but not too much. If you have a perfectly operating system using R12 you do not have to drop what you are doing and convert to R134a. By using a black light the dye will glow in areas where oil leaks are visible. Anyone know what happens when an R12 expansion valve is used in a system charged with R134A? Yes, I don't trust the heater valve either. Related products. The major reason for the replacement of R12 with R134a was to curb future greenhouse effects. R134a vs R12 refrigerant? The expansion valve(Tx) is in the car at the inlet line to the evaporator with compressors you best get advice from an ac specialist shop as the differences could be the gas that it pumps some systems use R12 and others use R134a or later gas yes R1234yf Freon gas can be replaced by R134a; the newer systems were designed with this in mind so no, there will be no damage to the compressor but some time in . You'll want the expansion valve matched to whatever refrigerant you're using. AFAIK, there is no clutch on the engine fan on the 240D. The analysis focuses on Coefficient of Performance for . Thus, when the system is running, condensing the CO2 is not a problem. The pressure/temperature curves for R-1234yf and R-134a are very similar. 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. If you have a York, and it is equipped with service valves, you can check & adjust the oil level without discharging the system. Energy usage: R134a is less efficient in cooling compared to R12. Gain access to our free AOP (Ask a Professional) Section to get real answers for your questions. The system will be checked for gross leaks while under vacuum. R134a has a smaller molecule than R12 so R134a will leak out sooner than R12. What was the ambient when you took that reading?Jumpering the aux fan is a common thing here in the desert. R-12 expansion valves can be re-used, but will not be as efficient as R-134a specific ones because of the slightly different pressure specs of R-12 vs. R-134a. Concentration level: The R134a vapor dilutes the oxygen concentration in the air to a low level, thereby causing harm. 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. Hopefully after you have read this entire page you will have enough information to determine which type of refrigerant is best for you. R1234yf is more environmentally friendly and has a global warming potential of 4. Can I just use an adapter and save $200? 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. Like say half a can or so recharge come springtime warm weather or something. 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. -The amount of R-134a needed will typically be 80-90% of the R-12 charge. 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. Still, I have some simple green, so may as well give it a go. Can I just use an adapter and save $200? Heres R12 vs. R134a pressure chart. Quick View. difference between r12 and r134a expansion valve. 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. As for R134a and R1234yf, theres no room for conversion. This is because R134a. 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. These efforts to balance the system can not be realized if there are problems within the a/c system, such as: poor performing compressor, dirty condenser or poor air flow through the condenser, malfunctioning expansion valve, water or air in the system, improperly operating fresh air or heat input in the climate-air mixing system. = R134a Charge Level. Also, they are mostly used in refrigeration and automotive air conditioning systems. This may be the source of your oil confusion. Neuro spine Super Speciality Clinic - Above Apollo Pharmacy, Bangarpet Circle, Kolar - Bangarpet Road, Kolar Town. 3) A TXV optimized for 134a will be ok with R12. This refers to BTU's (heat) moved per pound of refrigerant moved. 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. An orifice tube is just a fixed nozzle that pisses refrigerant into the evaporator without any sort of feedback. Though - the valve for a 1991 says R12 on it, and for a 1994, it says R-134a. It is made up of carbon, hydrogen, and fluorine. The system has been previously converted to R-134a. The MB chart shows 360 psi with R12 in some conditions. Miscibility with oil: R12 can be mixed with the compressor oil no matter the operating condition. Instead of using R12, its preferable to use R134a because it is very easy to find in the market, its sold at an affordable price, and is environmentally friendly. The bad thing is I don't know what to do about it. In practice this means that the car can overheat and the aux fan will stay off! Don't like the sound of custom parallel condensor. Edited: Sat July 14, 2007 at 10:22 PM by fonebone. This would become an expensive investment for a repair or service station to have unique dedicated equipment for every type of alternative refrigerant. They can be mounted quite easy,and there is a mounting kit that helps to hang it. The primary function of the design engineer is to make things difficult for the fabricator and impossible for the serviceman. The #1 question asked by NEW MEMBERS. 05-25-2017 02:14 AM. All fans must work at 100% of the OEM rating. It is a haloalkane and hydrofluorocarbon (HFC) refrigerant that has thermodynamic properties, potential global warming for one hundred years, and insignificant ozone depletion. Automotive Replacement Expansion Valves & Parts; Industrial & Scientific; Customer Reviews. There is NO reason to retrofit a vehicle to R-134a as long as the R-12 system is cooling properly and contains a normal charge of refrigerant. Debug the condensor (I am a computer nerd after all!)3. 1) Warm Air From Vents. Further production of R12 was banned in some developed countries by the Montreal Protocol because of its harsh effect on the ozone layer. It can be used applications like walk-in coolers, food and dairy display cases, domestic refrigerators, and beverage dispensers and vending machines. It won't be optimal, though. 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. I would not do a 134a conversion without a PF condensor. For R12, its mineral oil. 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. Any suggestions, or do you need to know the hi/lo readings? Thanks again. Ensure you contact a professional mechanic to do the work for you so you dont end up incurring more costs for yourself. There are significant differences between R12, R134a, and R513A, which must be considered when handling, processing, applying, or retrofitting with these refrigerants. 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. 1) Look Here at the available sizes of PF condensors.2) Go look at your vehicle's condensor & mounting. Gnats & mosquitos will clog deep. Using R134a requires that Polyolester (POE) lubricant must be used in the compressor. Discussion in 'Technical' started by Jsarnold, May 25, 2012. I'm thinking I might have put too much oil in the system - everywhere i read had a different amount - the manufacturer of the compressor, the MB factory service manual, online forums. 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. Is checking the temperature of the in and out of the condensor not the easiest way to tell if it is doing a good job or not? R134a compressors are substituted as new to retrofit the R12 system compressor part numbers with different height sealing washers. So that indicates it is cooling well there doesn't it? Warning: "continue" targeting switch is equivalent to "break".Did you mean to use "continue 2"? But as there's not a big difference, people say you can suffice with either. That would be the "black death" syndrome. Even with proper fan operation, missing seals & air dams can effect condensor effeciency. Big . Well, I'm not sure it is 'fine' - it doesn't cool very well in 95F weather. 1.5 ounces - hmmm. Nevertheless, if your application is configured only for R12, then you can use it or consider replacing the applications engine. Blows pretty hard on full. 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. Use a drop light in the engine bay, and check the air path from the front of the car at night. "Howdy, Folks!" The oil used in R12 systems is not compatible with R134a refrigerant. Is there a difference in the expansion valve for R12 as opposed to R-134a? I have the original (R12) style expansion valve in the Maverick AC system. Besides, R134a refrigerant was manufactured after R12 was banned to help reduce the harshness of the old chemical (R12) on the ozone layer. Maybe a jerky locker.I cleaned the condensor with the off the shelf ac cleaner stuff from Home Depot that I used on my home evaporator. The oil used in R12 and R134a are different and not compatible. If not, you just don't know unless a test is performed. R12 Expansion Valve = 201 830 06 84 R134A Expansion Valve = 201 830 04 84 Is there a difference after all? Bookmarks: Digg; del . 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. and he synthesized R-134a in 1936, 5 years after R-12 was . To bless the system the technician should attach a R134a sticker somewhere in the engine compartment to note the car is using R134a. Why wait for 200f on the engine coolant to start the fan? Condensers designed to release greater amounts of heat help to expel the greater amount of heat which R134a removes from the cars interior. 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. asia pacific stevie awards 2021. gin, amaretto cocktail. I'm having the same concern. For instance at 25 F the pressure of R-12 is 24.6 PSI and the pressure of R-134a is 22.1 PSI. Superheat you can consider to be the additional amount of heat. Electric fans do wear out. Expansion valves are an active device, they regulate the flow of refrigerant to the evaporator depending on evaporator temperature. R134a requires the use of synthetic oil! american sniper longest shot; how to adjust sunsetter awning arms; pastor jeremy roberts texas. Look at where the lines will end up. You may be just fine on oil - it depends on what compressor you have & how much oil you put in.A T/C is short for Thermocouple. PaulJerky King -------------------------1983 Mercedes 240D on R12 and WVO!1192 Mercedes 300D 2.5 R134a1993 Toyota Pickup converted to R134a. _____ 2012 E350 2006 Callaway SC560 . R12 and R22 are both now banned by the EPA in the United States. That way I will have reduced the oil by about 1/3 (assuming the oil is mixed evenly through the system). We say generally because the vehicle manufacturer may have a formula already worked out for the R134a conversion process. At 2000rpm, windows open, highest fan, hi pressure stabilized at 225 psi, low 25psi.Ambient 81F, vent 61F. We ALWAYS want to know the pressure readings! 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. Instead, top off R12 with R134a refrigerant. Its highest value is 1. However, R134a is better than R12. I've straightened the fans I can and sprayed simple green on it, let it soak then hosed it down well. The typical scenario here is when the car owner buys an inexpensive retro-fit kit from the local auto parts store. On the other hand, R12 has a global warming potential of 10,910. Pound for pound R134a is a more efficient refrigerant than R12, however it runs at higher pressures in some aspects and therefore requires more effective condensing. What effect would it have on performance, if any?At the moment, the ac is acting up - will work fine for about 15 minutes and then slowly the vent temperatures rise until the compressor switches off. In addition, R134a refrigerants are not only used in auto air conditioners, they can be used in freezers, aerosol cans, and refrigerators. That switch should close @ 52c. By noting the ambient temperature you can look up what the preferred high side pressure should be. Until 1995, most cars with air conditioning used R-12 Freon refrigerant which has shown to have an environmental impact. How about evacing 1 pound of refrig from the system, and then putting 1 lb of pure R12 back in? 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. The cost of recharging the air conditioner is between $150 to $500. When the temperature is reduced to-7C or below, the plants ability to cool the airdrops significantly. You may have heard of a friend that did the job himself with borrowed equipment and 12 or 16 ounce cans of refrigerant. Safety: R134a is safe to use as its non-flammable and cant explode. If there is a resource I should read first to save you time, let me know. Make sure to get the R12 EXP valve if that is the way you go. So you could likely put off buying those new hoses just a bit longer if you wanted. What is a good differential? They have no moving parts. But R22 is almost equally damaging. Moreso, it had been banned. R134a refrigerant fittings are different size. A final difference is that most (though not all) R-1234yf cars will have a Suction Line Heat Exchanger. In no particular order, here's what I've found out regarding answering the questions posed so far:Fonebone - It is definitely an R4 compressor (they left the c off the front and the p off the end, i.e. 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. A/C Expansion Valve Replacement Cost. 5. R12 is highly destructive to the earths ozone layer. Expansion Valve. The condensor airflow drops off as the fan clutch dies slowly. I'll put the relay on for that. 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 crossover point is approximately at 64F. So if the TXV is OK, and the too much oil situation is not a big problem, then I wonder why the compressor is switching off after about 15 minutes of cooling? Most of all the differences gravitate to longevity, functionality, and safety. had writing on the side that said R134a. If ambient is 90 (today) and the output of the condensor is 110, that's pretty good isn't it? BTW, I use a stick thermo in the vents and the laser on the condenser. How is the vent airflow?I would jumper the aux fan & check the performance. But as there's not a big difference, people say you can suffice with either. Can I use the one for the R-12? You should keep in mind that recharging your air conditioner improperly could result in more serious damage. All pre-97 XJs use systems with the same basic operating principle, although the parts do change a bit. It would make a big difference at idle ,in traffic!! 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. I'm not sure. The experimental values of C.O.P.H obtained with the R134a/ester charge were 20.2% . difference between r12 and r134a expansion valvewarning signs for a deteriorating patient with covid 19 infection 2022.07.03 18:36 18:36 bokoen1 hoi4 the great purge / meryl and maks dancing with the stars / difference between r12 and r134a expansion valve. 4.R404A R134a increased mass transfer resistance to reduce the transmission chamber heat coefficient, while R507 heat transfer coefficient is higher than R404A. Boiling Point: R134a refrigerants boiling point is -26.3C (-15.34F). 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. Als nostres webs oferimOne Piece,Doctor Who,Torchwood, El Detectiu ConaniSlam Dunkdoblats en catal. The system has been previously converted to R-134a. Just leave it alone for now. Is it exponential, squared? In large application systems, the vapor density of this refrigerant is usually high. Also, it can be used with all types of compressors. Recomanem consultar les pgines web de Xarxa Catal per veure tota la nostra oferta. I cleaned the evap as best I could, if that is what you are getting at. R134a is called tetrafluoroethane (HFC). by | Jun 21, 2022 | what is the most accurate latin translator | burlington iowa arrests | Jun 21, 2022 | what is the most accurate latin translator | burlington iowa arrests Lasers don't do well on vent temps, a stick thermometer is better in that application. Only show this user. The difference really shows up on the high side. Is there a difference between a R134a expansion valve and an R12 TXV? 42 (at best) w/ 134A in 2000 isuzu trooper. Hence, the effect of R12 on global warming is up to 10,000 times higher than carbon dioxide. What effect would it have on performance, if any? R12 was once used in many air conditioning units as a refrigerant or cooling agent. evarporator, expansion valve plus flushing out the full system and replacing all the o rings. If liquid refrigerant were to exit the evaporator. The difference between R12 and R134a TEV (exp valves) is primarily the 'superheat'. System has been working fine for a year. You can also check the Aux fan in your case. The reason is that the vehicles, for instance, manufactured currently configure the engine for R1234yf refrigerant, making no provision for replacement. You do not want to exceed the systems high side recommendations. Theres no problem with using R134a in a home air conditioning system because it is a hydrofluorocarbon that doesnt cause environmental harm. The name of the oil is Polyol Ester (POE). The larger fitting goes on the discharge port and the smaller fitting goes on the suction line or compressor inlet / suction port. A thermostatic expansion valve (TXV) (see Figure 1) is a refrigeration and air conditioning throttling device that controls the amount of refrigerant liquid injected into a system's evaporatorbased on the evaporator outlet temperature and pressurecalled the superheat. This is the part that controls the system pressures. Does it matter - assuming both are new & uncontaminated? The mechanical fan & clutch should be checked as well. 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. Statisicaly your friend was lucky. ~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446. But as there's not a big difference, people say you can suffice with either. and recharged with mineral oil and 2.2 lbs R12. Swapping the components isnt a herculean task, but recharging the AC is a challenge. How dumb!I will jumper the aux fan and redo the test. R-12 to R-134a Conversion. Skin contact: If the R134a (liquid) comes in contact with your skin, it could cause a burn. R134a is NOT less efficient than R12 Actually R134a is more efficient. 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. R12 is used in several applications like low temperature, medium temperature, and high-temperature applications. gital control scheme. R12 is heavier than R134a and has smaller molecules. The best oil that runs well with R134a is PAG oil or Polyalkylene Glycol. -------------------------"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."
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