difference between r12 and r134a expansion valve

Have a look in the FAQ Section, and look for "Fan clutches & testing them". 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. Any suggestions, or do you need to know the hi/lo readings? It is common for eurocar threads to go multiple pages, and as Nick points out - sometimes cool is all you will ever get. From memory, I put in at least 8 ounces of oil, probably around 10 ounces in there. Electric fans do wear out. Then I'll put the ball valve in on the coolant and test it and see what we have. difference between r12 and r134a expansion valvewarning signs for a deteriorating patient with covid 19 infection 2022.07.03 18:36 18:36 Bookmarks: Digg; del . It is also used in automotive car conditioning and the plastic industry. A/C systems designed to use R-12 will cool best when charged with R-12 refrigerant. A final difference is that most (though not all) R-1234yf cars will have a Suction Line Heat Exchanger. Paul:A 1983 240D should have a York compressor on an OEM system. Existing technology: R134a has been in use in the refrigeration industry for very many years, and theres so much information about the safe use of the product. At least you do not have 16 ounces in there ( yup seen it before).For now, straighten all of the fins that you can, clean the condensor well, and re-test with the aux fan running. Thanks so much Bohica - you've save me many more hours of fruitless speculation. Hence, the effect of R12 on global warming is up to 10,000 times higher than carbon dioxide. However, take note that R134a refrigerants are manufactured specifically for automotive air conditioners. If you you dont have the free time to play then you are better off to pay a technician. Formula: (R12 Charge Specification x 0.9) - 0.25 lbs. Paul:It is never a waste of my time to chat with someone that understands the problem, and wants to fix it. Thread starter goldNSX; Start date 1 August 2009; Tagged . 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. Answer: OK, I'll bite. The experimental values of C.O.P.H obtained with the R134a/ester charge were 20.2% R134a compressors are substituted as new to retrofit the R12 system compressor part numbers with different height sealing washers. 1) Look Here at the available sizes of PF condensors.2) Go look at your vehicle's condensor & mounting. About four or five years ago, I guy with an MB came here with the same problem, that tread was over six pages long. CLUTCH CYCLING SWITCH. R134a and R12 are among the most popular types of refrigerants. Then again, there are two different expansion valves. At 2000rpm, windows open, highest fan, hi pressure stabilized at 225 psi, low 25psi.Ambient 81F, vent 61F. The original CFC expansion valve used for R12 needs to be replaced with an HFC one for 134a to feed the evaporator correctly. These differences in the valve size can be attributed to the correlation of the cooling capacity with the enthalpy difference and the mass flow, which in . In addition, R134a refrigerants are not only used in auto air conditioners, they can be used in freezers, aerosol cans, and refrigerators. Is there more info needed?THanks -------------------------1983 Mercedes 240D on R12 and WVO!1192 Mercedes 300D 2.5 R134a1993 Toyota Pickup converted to R134a, Paul:I had to dig a bit deeper - MB made several running changes in the 1983 123'sThere are actually 4 different circuit diagrams for the A/C system that year - just for your 123.123 I found the R4 reference, and it should have 170 Ml of oil in the system.Your aux fan should run at the ambients you listed. Bottom line, R134a simply doesn't cool as well as R12. Use strips of foam to couple the two heat exchangers if necessary.B. B. To prevent refrigerant loss you should consider replacing your old hose lines with barrier type hose. However, R12 refrigerants are still used as fire retardants in aircraft and submarines. Just leave it alone for now. The pressure at low temperatures is nearly the same between 12 and 134a. I found that in the..Maxposition on the control it will have the compressor running all the time. R12 is used in several applications like low temperature, medium temperature, and high-temperature applications. The OEM spec is 2300 rpm @ 12.6v (engine stopped fully charged battery). Also, R134a cylinders are light-blue in color. By using a black light the dye will glow in areas where oil leaks are visible. It slowly gets warmer and warmer in the car, even at highway speeds. Is there a difference between a R134a expansion valve and an R12 TXV? R134a. Boiling Point: R134a refrigerants boiling point is -26.3C (-15.34F). The old compressor used R12 and the new unit will be R134a. Catalog E-1, Thermostatic & Automatic Expansion Valves / Page 1 Table of Contents . 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. As per their results . Its chemical symbol is CCl2F2. The evap is hard to get at. 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. What is usually sniffed are all the connections in the system: hoses and compressor, condenser, drier, expansion valve and evaporator fittings. That would be the "black death" syndrome. Different correction factors are applied to other refrigerants. You do not need to replace the expansion valve in most cases. This means that it has a high potential of causing depletion to the ozone layer. ~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446. Even though their common major function is to cool the system, they have many differences. R12 Expansion Valve = 201 830 06 84 R134A Expansion Valve = 201 830 04 84 Is there a difference after all? 5. But R22 is almost equally damaging. And, unfortunately a small high side pressure gauge on a short hose. It's not just the poor performance - the cooling just stops working after a while. R-134a is widely believed to be the most acceptable R12 substitute. For instance you can evacuate FRIGC FR-12 into a refrigerant recovery bottle that has R134a in it or visa versa. The only difference I can imagine would be the recharge connection. Get to the point where I can walk without crutches2. 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. Does it matter - assuming both are new & uncontaminated? Therefore, the higher the factor of the chemical (compound), the greater its effect on global warming. If he is not in the garage fixing challenging mechanical problems, he is writing automotive repair guides, buyers guides, and car and tools comparisons. difference between r12 and r134a expansion valve why is miles raney not on homestead rescue June 21, 2022. manila mayor candidates 2022 Best for varieties of operating conditions: Its boiling point is -21.6 Celsius. Though - the valve for a 1991 says R12 on it, and for a 1994, it says R-134a. What is needed? Automotive Replacement Expansion Valves & Parts; Industrial & Scientific; Customer Reviews. The substitute that we used for R-12 was the new HFC called R-134a. Reattach the hose lines using new R134a compatible o-rings, lightly lubricate with compressor oil. The oil used in R12 and R134a are different and not compatible. R12 contains a chemical called chlorine that destroys the ozone layer, thereby causing potential environmental risk. Statisicaly your friend was lucky. Only show this user. How is the vent airflow?I would jumper the aux fan & check the performance. 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. had writing on the side that said R134a. GWP is a measurement of Greenhouse Gases and their effect on Global Warming. hardly noticable. ESP when a compressor has frozen. Read on for more information about using automotive r134a in a refrigerator and vice versa. -------------------------"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." We mention using ester type refrigerant oil. The difference between the two is about 10,000 btu/h. "Howdy, Folks!" Then at least I'd know really where I am on it. Any advice appreciated. Fitting a PF condensor is not rocket science, but it requires some planning. R134a is otherwise called 1,1,1,2 Tetrafluoroethane, Florasol 134a, Freon 134a, Norflurane (INN) or HFC 134a. The cure is to use the newer R134a compressors is sealing washers that are different thickness. If your car does not have a high pressure cut-out switch in the AC system then youll need to have one installed (call us if you need help). a 50f delta across the condensor is good, but I suspect that is an idle reading. R12 was once used in many air conditioning units as a refrigerant or cooling agent. R134a requires a different oil. Environmental Impact: When R134a escapes into the atmosphere, it contributes to global warming. The condensor airflow drops off as the fan clutch dies slowly. 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. If there is no pusher fan, and you have the room, put one in. Nevertheless, if your application is configured only for R12, then you can use it or consider replacing the applications engine. R12 and R22 are both now banned by the EPA in the United States. Yes, this was a smokers car. shown for the parallel flow, aluminum condenser that is listed. Related products. Miscibility with oil: R12 can be mixed with the compressor oil no matter the operating condition. Discussion in 'Technical' started by Jsarnold, May 25, 2012. The pressure at low temperatures is nearly the same between 12 and 134a. The higher the ambient temperature the higher the high side pressure. Crap! 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. This leads me to labor over every small decision. Please enter a password for your user account. With the A/c off hi and lo were both at 105psi. But, what is considered a good temperature differential across the condensor? ). It can be used applications like walk-in coolers, food and dairy display cases, domestic refrigerators, and beverage dispensers and vending machines. "Jerky Locker" LMAO I am using that one in the future!Florida = BUGS! evarporator, expansion valve plus flushing out the full system and replacing all the o rings. The problem with not being an expert is that you don't know what is important and what's not. Swapping the components isnt a herculean task, but recharging the AC is a challenge. 1.5 ounces - hmmm. With the oil leaking out and being told all sorts of things about how these compressors don't have a sump etc, I wanted to be on the safe side. This refers to BTU's (heat) moved per pound of refrigerant moved. That is a good thing. Paul -------------------------1983 Mercedes 240D on R12 and WVO!1192 Mercedes 300D 2.5 R134a1993 Toyota Pickup converted to R134a. R134a is the most widely accepted alternative automotive refrigerant used to replace R12. Condensers designed to release greater amounts of heat help to expel the greater amount of heat which R134a removes from the cars interior. The R134a compressor has a 1/8" step in on the high side port. gital control scheme. With R-12, 30 is 28.4psi and 40 is 36.9psi, for a difference of 8.5psi. -------------------------"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." When the temperature is reduced to-7C or below, the plants ability to cool the airdrops significantly. Refrigerators generally utilize R22, R32, or 410A-based coolants as their cooling agent. Above this temperature, the saturation pressure of R134a is higher than that of R12; below, it is lower. As an example, let's say the R12 charge specification is listed at 2 lbs. In a car ac, using this type of freon 20 years ago was difficult. Lasers don't do well on vent temps, a stick thermometer is better in that application. 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. In most cases, the systems used have varied components, designs, and service ports. video clubhouse baseball; nick fairley draft profile; ben davis work pants I would not do a 134a conversion without a PF condensor. (On firewall where A/C lines go into cab.) Super heats are so close, it should not be a major concern.-------------------------The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government. 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. Just because the radiator does not boil people assume that the cooling system is ok. Superheat you can consider to be the additional amount of heat. As for R134a and R1234yf, theres no room for conversion. Inasmuch as R134a has a global warming potential thats over 1000 times more threatening than carbon dioxide, its better than R12.

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