compressor, condenser, evaporator and expansion valve are specifically designed for use with R134a. A/C receiver difference between R12 and R134a? Yep, definately not a meat locker. But, if your car lacks enough condenser and you have many 100+ degree days then you may want to stick either increase air flow, add another condenser as we mentioned in The Mr. Ice Project or stick with R12. Thomas Jefferson, Thanks,OK, I'm starting to feel a little better about it. Is there a graph? It didn't seem too dirty though - I don't think it is the problem, but I could be wrong. R12 is simply too expensive for a 25+ year old A/C system. 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? R134a compressors are substituted as new to retrofit the R12 system compressor part numbers with different height sealing washers. video clubhouse baseball; nick fairley draft profile; ben davis work pants Performance doesn't seem to have improved. Some compressor manufacturers or OEMs suggest PAG type oil for R134a. Its cylinders are colored white. That is a good thing. The Main change in the system is the expansion valve. difference between r12 and r134a expansion valve. Mine was 61, so the system is not working as it is supposed to. For example, if your system originally had 36 ounces of R12 then you multiply that by .80 and you have 29 ounce of R134a. Expansion Valve. 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. Make sure visiually that no large gaps exist that would allow the air to bypass the condensor on the way to the radiator.B. This leads me to labor over every small decision. = R134a Charge Level. In large application systems, the vapor density of this refrigerant is usually high. Use a drop light in the engine bay, and check the air path from the front of the car at night. I have some experience with auto a/c but not too much. I'll put the relay on for that. This is an electronic tool that sucks in air through a tube and across a sensor. It runs between the condenser outlet, receiver/drier unit and expansion valve at the firewall. Thus, when the system is running, condensing the CO2 is not a problem. It is made up of carbon, hydrogen, and fluorine. It won't be optimal, though. 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. Stay home and grill your own steaks and stir your own martini. ~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446. 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. . What is a good differential? R134a has a smaller molecule than R12 so R134a will leak out sooner than R12. 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. Replacement expansion valve for R134a or R12 A/C refrigerants, with O-ring connections. You will be fine with a 134a-compatible TXV running R12. Your average garage that works on a/c on the side probably would not have this. Its highest value is 1. If your a/c system is empty/low on refrigerant, if your system has a leak or if you need to open the system, then now is the time to decide which refrigerant you want to use. Note that passwords are case-sensitive. 1) Warm Air From Vents. R12 is highly destructive to the earths ozone layer. He used thermostatic expansion valve and Capillary tube for analysis with R12. How is 1234yf different from . 3 ounces? The AC usually does not work at all. Does it matter - assuming both are new & uncontaminated? On this website we are addressing only R134a and not other suggested drop in replacements. Besides, its technology has been tested and trusted. Also called the orifice tube. I would not do a 134a conversion without a PF condensor. Disconnect the two hose lines to the compressor, protect the ends from getting dirty. Then at least I'd know really where I am on it. Post photos, respond to polls and access other special features. Thread starter goldNSX; Start date 1 August 2009; Tagged . 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. I have the original (R12) style expansion valve in the Maverick AC system. 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 you have the work done, be sure you find a true "A/C" shop that can make up lines. 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. Even though their common major function is to cool the system, they have many differences. ESP when a compressor has frozen. and feeds it through an expansion valve. The aux fan seems to be working fine - it switches on occassionally. This would be a custom install, there is no "drop-in" condensor upgrade for that car.Check for proper fan operation, and clean the air path on both the condensor & radiator. -------------------------"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." As for R134a and R1234yf, theres no room for conversion. They have no moving parts. 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. Trinary Pressure Switch quantity. Once you have replaced the OEM condensor with a PF unit, you will need to make custom hoses to mate with your OEM system. 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. Lasers don't do well on vent temps, a stick thermometer is better in that application. I cleaned the evap as best I could, if that is what you are getting at. 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. I'm just trying to help you avoid headaches in the long run. R-134a XV for R-134a use. 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. Trinary Pressure Switch $ 39.99. The old compressor used R12 and the new unit will be R134a. 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. Took me a while to figure that one out, and how to say that. R12 Expansion Valve = 201 830 06 84 R134A Expansion Valve = 201 830 04 84 Is there a difference after all? I think so. ambulance tailgate conversion Skin contact: If the R134a (liquid) comes in contact with your skin, it could cause a burn. R134a refrigerant is about 10% less efficient in moving heat than R12! With R-12, 30 is 28.4psi and 40 is 36.9psi, for a difference of 8.5psi. -The amount of R-134a needed will typically be 80-90% of the R-12 charge. How is the vent airflow?I would jumper the aux fan & check the performance. The #1 question asked by NEW MEMBERS. You may have heard of a friend that did the job himself with borrowed equipment and 12 or 16 ounce cans of refrigerant. We sometimes use a relay switched from the compressor clutch to run fans. The next piece of equipment to track down leaks is a leak sniffer. R12, on the other hand, is called chlorofluorocarbon (CFC). Fitting a PF condensor is not rocket science, but it requires some planning. The ozone depletion potential of a chemical is a factor that shows the level of degradation itll cause to the ozone layer that surrounds and secures the earth from harmful radiation. 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. R134a is called tetrafluoroethane (HFC). So to keep things simple and to avoid controversy and politics we have R134a. Therefore, the higher the factor of the chemical (compound), the greater its effect on global warming. R-401b is the mixture by weight of 61% R22, 11% R-152a and 28% of R-124. Neuro spine Super Speciality Clinic - Above Apollo Pharmacy, Bangarpet Circle, Kolar - Bangarpet Road, Kolar Town. The cure is to use the newer R134a compressors is sealing washers that are different thickness. The flammables have hydrocarbons. difference between r12 and r134a expansion valve . _____ 2012 E350 2006 Callaway SC560 . Use a strong surfactant like Simple Green or Zep Citrus, and soak the fins on the condensor. Hopefully after you have read this entire page you will have enough information to determine which type of refrigerant is best for you. 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 chemical composition of R12 and R134a differ. R134a is NOT less efficient than R12 Actually R134a is more efficient. Carefully study the chart and compare the following: To a large extent, the choice is up to you. might be due to charge or different compressor and age. 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. The mechanical fan & clutch should be checked as well. 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. Since then, the industry standard has been R134a, which is an efficient replacement. If your cars system has a sufficient condenser design and air flow to expel the greater amount of heat extracted by R134a, then by all means you should convert over when the time comes. Are you sure you have an R4? At 2000rpm, windows open, highest fan, hi pressure stabilized at 225 psi, low 25psi.Ambient 81F, vent 61F. R134a vs R12 refrigerant? Until 1995, most cars with air conditioning used R-12 Freon refrigerant which has shown to have an environmental impact. 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. R134a Refrigerant Recharge Kit with BPV31 Bullet Piercing Valve and R134a Quick Coupler, R134a/R-12/R-22 Freon Refrigerant Hose Can Tap Kit for A/C System - Easy to use. 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. When the temperature is reduced to-7C or below, the plants ability to cool the airdrops significantly. Quick View. Components Coils, Heaters, Motors, etc. -------------------------"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." At 40, it is 35psi, which is a difference of 8.9psi. Before we mentioned that you can add approximately 5-6 ounces of ester oil to the compressor. It is common for eurocar threads to go multiple pages, and as Nick points out - sometimes cool is all you will ever get. 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. The symbol implies that R12 is a composite of carbon, chlorine, and fluorine. Hence, let us continue to fix it. I bought a relay to put on it connected to the compressor clutch. Though I have seen em run as cold as 12 deg F. If the thermo switch is malfunctioning. Then, subtract that result by 0.25 pounds to get the proper amount of R134a charge. It is also used in automotive car conditioning and the plastic industry. 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. 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. A/C Expansion Valve Replacement Cost. In addition, R134a refrigerants are not only used in auto air conditioners, they can be used in freezers, aerosol cans, and refrigerators. The approval is very legal one, governed by the U.S. EPA. From memory, I put in at least 8 ounces of oil, probably around 10 ounces in there. GWP is a measurement of Greenhouse Gases and their effect on Global Warming. The best oil that runs well with R134a is PAG oil or Polyalkylene Glycol. The oil used in R12 and R134a are different and not compatible. R134a has a smaller molecule than R12 so R134a will leak out sooner than R12. It's actually a reaction with chlorine in the mineral oil that may have been absorbed and leftover from the old R-12. Thanks for the input. I found that in the..Maxposition on the control it will have the compressor running all the time. Please enter a password for your user account. Spray it deep, and let it sit for a few minutes.
