I've done the FSM test and with 81F ambient, the vent should be 50F. Where would I get some basic info on it, I know nothing about it. 3) A/C Compressor Always On. What is a good differential? Lasers don't do well on vent temps, a stick thermometer is better in that application. . Measure what you have now.3) Go back to the page in step one, and find the largest condensor you can put in your vehicle. Hopefully after you have read this entire page you will have enough information to determine which type of refrigerant is best for you. . The condenser water inlet temperature and flow rate are controlled with the use of a . Put a relay on the compressor clutch to the aux fan (I like that idea - makes a lot of sense)How does that sound? Best for varieties of operating conditions: Its boiling point is -21.6 Celsius. As R134A refrigerant has different operating characteristics and pressures this valve is not necesssry. R134a systems operate at higher discharge-side pressures than R12, which can cause compressor seals to leak. 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. This works when the R12 charge specification is listed in pounds. In the automotive world, the replacement for R12 was R134a. R134a has a smaller molecule than R12 so R134a will leak out sooner than R12. Hmmmm. After the initial charge the system is then tweeked : you determine the optimum amount of refrigerant to match your system by monitoring the a/c outlet vent temperature and the high side pressure as you add or remove refrigerant. A comparison between R12 vs. R134a temperature will show that R12 has a higher temperature than R134a. I don't believe it is but I had a service guy tell me it needs to be done. Therefore, the R12 refrigerant is illegal, and emitting it is illegal. The pressure/temperature curves for R-1234yf and R-134a are very similar. Quick View. The bad thing is I don't know what to do about it. R134a and R12 are among the most popular types of refrigerants. A. Pressure/temperature plot of R134a vs. R12 is shown in figure 1. Questions About Becoming A Professional Member? Your decision could be made based on economics, environmental concerns, or both. The catalytic converter is an essential component of your car's emission system that helps save the environment from harmful emissions. -------------------------1983 Mercedes 240D on R12 and WVO!1192 Mercedes 300D 2.5 R134a1993 Toyota Pickup converted to R134a. It didn't seem too dirty though - I don't think it is the problem, but I could be wrong. You can buy bulk hose, and the proper fittings, then have them crimped off the vehicle.Be sure that no air bypasses the new condensor on the way to the radiator. Is there a difference in the expansion valve for R12 as opposed to R-134a? ). Its chemical symbol is CCl2F2. What was the ambient when you took that reading?Jumpering the aux fan is a common thing here in the desert. Edited: Tue July 17, 2007 at 3:25 AM by bohica2xo, I believe there is only one switch - the refrigerant switch. in /nfs/c05/h04/mnt/113983/domains/toragrafix.com/html/wp-content . Above this temperature, the saturation pressure of R134a is higher than that of R12; below, it is lower. You are indeed 20% out of the OEM spec for cooling. But as there's not a big difference, people say you can suffice with either. In cases such as this, the required capacity value of the expansion valve with R134a is reduced by 30% (correction factor 1.42). 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. If you have 10 ounces of oil in the system, that is contributing to the poor performance as well. The first vehicle that used the R1234yf refrigerant was the 2013 Cadillac XTS. The cost of recharging the air conditioner is between $150 to $500. How is the vent airflow?I would jumper the aux fan & check the performance. The system has been previously converted to R-134a. Usually, mechanics charge around $200 for conversion. Above this temperature, the saturation pressure of R134a is higher than that of R12; below, it is lower. Like say half a can or so recharge come springtime warm weather or something. An extra half ounce? A vacuum pump, a refrigerant recover system, quality service gauge set with both low and high side gagues, and much more besides the lessons to learn what to do and what not to do. As R134A refrigerant has different operating characteristics and pressures this valve is not necesssry. R12 contains a chemical called chlorine that destroys the ozone layer, thereby causing potential environmental risk. In practice this means that the car can overheat and the aux fan will stay off! This may be the source of your oil confusion. With the A/c off hi and lo were both at 105psi. Als nostres webs oferimOne Piece,Doctor Who,Torchwood, El Detectiu ConaniSlam Dunkdoblats en catal. Trinary Pressure Switch quantity. As noted, measure up front as best as you can to get as close to the aftermarket dim. If you have a York, and it is equipped with service valves, you can check & adjust the oil level without discharging the system. R134a was selected as a replacement refrigerant for R12 because R12 contains chlorine and has a major effect to ozone layer depletion. 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. Shorting the plug for the refrigerant switch should run the fan when the compressor is on. You do not want to exceed the systems high side recommendations. 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. Generally this works well for the whole system. 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. The substitute that we used for R-12 was the new HFC called R-134a. Besides, R134a refrigerant was manufactured after R12 was banned to help reduce the harshness of the old chemical (R12) on the ozone layer. 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. Then at least I'd know really where I am on it. 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. It is mixed with the freon for the most part, and does accumulate in all components in small amounts. Only show this user. I recommend replacing the expansion valve when you do the swap. A capacity curve is shown in figure 2 for relative capacity of R134a vs. R12 for evaporating temperatures from 0F to 50F. 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. R134a compressors are substituted as new to retrofit the R12 system compressor part numbers with different height sealing washers. 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. Is the information not applicable to the old Pantera system? Refrigerators generally utilize R22, R32, or 410A-based coolants as their cooling agent. and an evaporator core and expansion valve that are optimized for R134a . However, R12 refrigerants are still used as fire retardants in aircraft and submarines. It runs between the condenser outlet, receiver/drier unit and expansion valve at the firewall. After the optimum refrigerant charge is determined the car should be test driven to check for performance of the system. evarporator, expansion valve plus flushing out the full system and replacing all the o rings. Please enter a valid email address for yourself. R134a is called tetrafluoroethane (HFC). If the system was upgraded by a professional it should have an upgrade sticker. The cure is to use the newer R134a compressors is sealing washers that are different thickness. What is a T/C?4. Compared with the cost-performance ratio, R507 is 30-40% . My turn to LOL - greasiesel! difference between r12 and r134a expansion valve. I mean, really a lot. Its highest value is 1. Use strips of foam to couple the two heat exchangers if necessary.B. But as there's not a big difference, people say you can suffice with either. 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. If you're getting a R134a compressor, might as well finish the job - replace the receiver/dryer, flush everything else, and convert to R134a anyhow. Not osmosis, but you know what I mean). Just leave it alone for now. difference between r12 and r134a expansion valve. You may need to adjust the valve in a bit to get desired superheat. Then when it is switched off for a few minutes and then back on, the air cools again. R134a. . In a car ac, using this type of freon 20 years ago was difficult. 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. R134a is called tetrafluoroethane (HFC). Next I'll jumper the aux fan. Paul:A 1983 240D should have a York compressor on an OEM system. The compressors used by refrigeration plants to compress gas require oil to help lubricate its moving parts. had writing on the side that said R134a. Is there a difference between a R134a expansion valve and an R12 TXV? The global warming potential measures the amount of heat trapped by any gas compared to the amount of heat trapped by the same amount of carbon dioxide. It is made up of carbon, hydrogen, and fluorine. You can use this space to go into a little more detail about your company. 3 ounces? Skin contact: If the R134a (liquid) comes in contact with your skin, it could cause a burn. Is that why expansion valves are specific to R12 or R134A? From memory, I put in at least 8 ounces of oil, probably around 10 ounces in there. Not going to mess up your 'do, but you can feel it. I would not do a 134a conversion without a PF condensor. Catalog E-1, Thermostatic & Automatic Expansion Valves / Page 1 Table of Contents . To prevent refrigerant loss you should consider replacing your old hose lines with barrier type hose. For instance at 25 F the pressure of R-12 is 24.6 PSI and the pressure of R-134a is 22.1 PSI. I could easily be over at least 2 - 3 ounces over on the oil. video clubhouse baseball; nick fairley draft profile; ben davis work pants This chart has a column of ambient (outside) air temperatures on one side and a corresponding range of high side pressures on the other side. 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. 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. Large temperature difference between expansion valve inlet and outlet oReplace expansion valve Air . -------------------------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. I put one in my old daily driver '79 Chevy tank (r-12), and it really made a difference. of coiled cap tube on VCR system with R134a. We've updated our forums!Click here to visit the new forum, Year: 1983Make: MercedesModel: 240DEngine Size: 2.4Refrigerant Type: R12Ambient Temp: 90Pressure Low: 35Pressure High: ?Country of Origin: United States, Hi, this is my first post, so please take it easy on the noob. It is usually sold under the brand name, Freon 12. R134a has an ozone depletion potential of 0, implying that it has a slight effect on the ozone layer. R 134A is designed for the high demands of an automobile AC and cannot be used on refrigerators due to pressure differences. In 1994 they switched from R-12 to R-134a. El juny de 2017, el mateix grup va decidir crear un web deDoctor Who amb el mateix objectiu. 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. It's not just the poor performance - the cooling just stops working after a while. Given two identical vehicles, each with the same weighted amount of refrigerant, the vehicle with the R134a has the capability to remove more heat (measured in btus) from the vehicle than the same type of vehicle using the same amount of R12. With R-12, 30 is 28.4psi and 40 is 36.9psi, for a difference of 8.5psi. The only difference I can imagine would be the recharge connection. Moreso, it had been banned. Is there a graph? The problem with not being an expert is that you don't know what is important and what's not. 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.
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