R134a requires the use of synthetic oil! Also called the orifice tube. It's best to determine on a case-by-case basis while monitoring system pressures and output air temperature. How is the vent airflow?I would jumper the aux fan & check the performance. 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. 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. Therefore, the R12 refrigerant is illegal, and emitting it is illegal. In sum, R12 has done more bad than good. R134a refrigerant is lighter than R12. 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. I don't know where it is getting the switch off command, or why the vent temp drops steadily. (You must log in or sign up to reply here. So to keep things simple and to avoid controversy and politics we have R134a. in /nfs/c05/h04/mnt/113983/domains/toragrafix.com/html/wp-content . El juny de 2017, el mateix grup va decidir crear un web deDoctor Who amb el mateix objectiu. 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. Superheat you can consider to be the additional amount of heat. Figure 2 shows the different phases and pressures the refrigerant . and he synthesized R-134a in 1936, 5 years after R-12 was . As for R134a and R1234yf, theres no room for conversion. 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. Its cylinders are colored white. When the temperature is reduced to-7C or below, the plants ability to cool the airdrops significantly. This can be very very expensive. When ever possible you should ask the technician to note the same information on your repair bill and keep a copy in your glove box for future reference. The chemical composition of R12 and R134a differ. 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. Anyone know what happens when an R12 expansion valve is used in a system charged with R134A? Best for varieties of operating conditions: Its boiling point is -21.6 Celsius. of coiled cap tube on VCR system with R134a. James10952001. The name of the oil is Polyol Ester (POE). The MB chart shows 360 psi with R12 in some conditions. They have no moving parts. -The amount of R-134a needed will typically be 80-90% of the R-12 charge. Hot coolant migrates up through the core by convection (is that the word? Concentration level: The R134a vapor dilutes the oxygen concentration in the air to a low level, thereby causing harm. 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. Hence, the effect of R12 on global warming is up to 10,000 times higher than carbon dioxide. The flammables have hydrocarbons. Bottom line, R134a simply doesn't cool as well as R12. 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. They plug all the time. Heres R12 vs. R134a pressure chart. It is a haloalkane and hydrofluorocarbon (HFC) refrigerant that has thermodynamic properties, potential global warming for one hundred years, and insignificant ozone depletion. June 21, 2022 difference between r12 and r134a expansion valve . The old compressor used R12 and the new unit will be R134a. Before landing on the debate of R134 vs R12 you should know that both R134a and R12 are AC refrigerants types used in refrigeration and air conditioning systems. R12 is CFC: Even though R12 is one of the most commonly used refrigerants, it is CFC. Crap! Above this temperature, the saturation pressure of R134a is higher than that of R12; below, it is lower. Its chemical symbol is CH2FCF3. This drop can affect energy consumption since the plant will operate for a longer period or a larger plant will have to be installed. -------------------------1983 Mercedes 240D on R12 and WVO!1192 Mercedes 300D 2.5 R134a1993 Toyota Pickup converted to R134a. Debug the condensor (I am a computer nerd after all!)3. Lets take you through the advantages, disadvantages, and differences of these two refrigerants a detailed comparison including R12 vs R134a performance. Miscibility with oil: R12 can be mixed with the compressor oil no matter the operating condition. Formula: (R12 Charge Specification x 0.9) - 0.25 lbs. The compressors used by refrigeration plants to compress gas require oil to help lubricate its moving parts. 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 Next I'll jumper the aux fan. By using a black light the dye will glow in areas where oil leaks are visible. ambulance tailgate conversion Very interesting! Also the new quick connect fittings for the high & low side. Since 2010, all home AC systems manufactured use a refrigerant like R134a that has zero ozone depletion potential (ODP). What is a good differential? Hopefully after you have read this entire page you will have enough information to determine which type of refrigerant is best for you. Spray it deep, and let it sit for a few minutes. Its chemical symbol is CH2FCF3. Use a drop light in the engine bay, and check the air path from the front of the car at night. This is an electronic tool that sucks in air through a tube and across a sensor. 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. I think the way to go here is1. That is a good thing. and he synthesized R-134a in 1936, 5 years after R-12 was . 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. The mechanical fan & clutch should be checked as well. 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. If liquid refrigerant were to exit the evaporator. VerticalScope Inc. All Rights Reserved. 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. Some cars have both an engine coolant temp switch & a refrigerant temp switch, others only the refrigerant switch. I have just bought gauges. Below are the major differences between R134a and R12: Chemistry The chemical composition of R12 and R134a differ. R12 was once used in many air conditioning units as a refrigerant or cooling agent. So that indicates it is cooling well there doesn't it? 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. As an example, let's say the R12 charge specification is listed at 2 lbs. Rules governing changing from the former to the latter differ between countries. Use a strong surfactant like Simple Green or Zep Citrus, and soak the fins on the condensor. R134a is NOT less efficient than R12 Actually R134a is more efficient. I've done the FSM test and with 81F ambient, the vent should be 50F. -------------------------"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." absorb by the evaporator to insure all liquid refrigerant entering the evaporator. The problem with these so called drop in replacements is that to properly handle them you may need dedicated equipment to identify the gas and evacuate it for proper disposal. By after changing just about everything, he got what was termed, satisfactory cooling. We, the Rxmechanic team, have presented a well-detailed comparison of R134a vs. R12. I'll put the relay on for that. Depending on which circuit diagram fits your car (cough, no vin list exists) you have either one or two switches controlling the aux fan. 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. Then, subtract that result by 0.25 pounds to get the proper amount of R134a charge. Replied by Rich928 on topic R12 or R134a. Is there a difference between a R134a expansion valve and an R12 TXV? ~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446. The major reason for the replacement of R12 with R134a was to curb future greenhouse effects. However, R134a is better than R12. Rules governing changing from the former to the latter differ between countries. It will work and there will be very little, in any difference in performance.As Chick stated, the difference is only the gas used in the sensor tube. ThanksPaul -------------------------1983 Mercedes 240D on R12 and WVO!1192 Mercedes 300D 2.5 R134a1993 Toyota Pickup converted to R134a. R134a. The common problem when converting from R12 to R134a is lack of knowledge or equipment. I'm just trying to help you avoid headaches in the long run. Condensers designed to release greater amounts of heat help to expel the greater amount of heat which R134a removes from the cars interior. 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. An extra half ounce? On this website we are addressing only R134a and not other suggested drop in replacements. 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. difference between r12 and r134a expansion valve why is miles raney not on homestead rescue June 21, 2022. manila mayor candidates 2022 Your old hoses of course will not fit. If you have a perfectly operating system using R12 you do not have to drop what you are doing and convert to R134a. It was later found that R-134a had a very high Global Warming Potential, or GWP, number. ~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446. evarporator, expansion valve plus flushing out the full system and replacing all the o rings. The only mechanical differences between an R12 system and an R134a system are that R134a systems typically have larger condensers and more powerful compressors. The butylcellusolve or the citrus solvent will dissolve the carcass in a few minutes. Thus, when the system is running, condensing the CO2 is not a problem. The exact amount will vary with each car. Some say that a chemical reaction can harm the A/C very badly as R134a reacts with mineral oil in some way. Even if the system leaks, repairing the leaks and recharging it with R-12 is usually the best repair alternative. Reattach the hose lines using new R134a compatible o-rings, lightly lubricate with compressor oil. You'll want the expansion valve matched to whatever refrigerant you're using. -------------------------"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." Does it matter - assuming both are new & uncontaminated? Mark Baker R-401b is the mixture by weight of 61% R22, 11% R-152a and 28% of R-124. I've got a ball valve I'm going to put in the coolant line before the coolant goes through the firewall to the core. 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. This kit comes complete with Expansion valve, o-ring kit, and 1ft. SO here's my question. If not, you just don't know unless a test is performed. But as there's not a big difference, people say you can suffice with either. I just got some hi/lo side gauges so I'm going to take readings, if they are needed. 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.
Curly Hair Salon Chicago,
Klay Thompson Laura Harrier Split,
Ed Troyer Family,
Elliott Reeder Laura Woods,
Professional Dog Training Equipment,
Articles D