Helical and Serpentine coils. Expansion Valves Catalog E-1, July 2012. 34 in 70 series w/ R12 in 100+ Tucson, AZ summer heat w/ hd-t, w/ 13B-T is was unbearable about 31 at vent w/ R12. If you have the work done, be sure you find a true "A/C" shop that can make up lines. The approval is very legal one, governed by the U.S. EPA. I recommend replacing the expansion valve when you do the swap. I dont know why the cost difference between compressors is so huge, though. Any suggestions, or do you need to know the hi/lo readings? Attach the R134a charge port adaptors, there are two types.. one of which you need to remove the old R12 valve cores. Superheat you can consider to be the additional amount of heat. Minor adjustments to the expansion valve and other controls may be necessary for some plans. This is 11F off the FSM performance graph - vent should be around 50F. The only difference I can imagine would be the recharge connection. R134a systems operate at higher discharge-side pressures than R12, which can cause compressor seals to leak. I used a full can of evap cleaner. The cable is adjustable at the valve arm. The AC usually does not work at all. of coiled cap tube on VCR system with R134a. Therefore, the higher the factor of the chemical (compound), the greater its effect on global warming. Interestingly, theres one oil type that works perfectly with both types of refrigerants. ~ 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. The evap is hard to get at. A capacity curve is shown in figure 2 for relative capacity of R134a vs. R12 for evaporating temperatures from 0F to 50F. 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.
UNDERSTANDING A/C Everything You Need To Know - Classic Auto Air Tech Talk - Differences between R-1234yf and R-134a - FJC Inc With the knowledge of the differences, youll be able to draw a comparison between R12 vs R134a efficiency. Not going to mess up your 'do, but you can feel it. Carefully study the chart and compare the following: To a large extent, the choice is up to you. Took me a while to figure that one out, and how to say that. -The amount of R-134a needed will typically be 80-90% of the R-12 charge. difference between r12 and r134a expansion valve. and feeds it through an expansion valve. The difference between R12 and r134a is the BTU carrying capability. 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.
R-12 vs R-134a Hose - Pelican Parts Forums 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. We've updated our forums!Click here to visit the new forum, Year: 1991Make: Jaguar Model: XJ6Engine Size: 4.0. The first vehicle that used the R1234yf refrigerant was the 2013 Cadillac XTS. Why wait for 200f on the engine coolant to start the fan?
difference between r12 and r134a expansion valve A comparison between R12 vs. R134a temperature will show that R12 has a higher temperature than R134a. I put one in my old daily driver '79 Chevy tank (r-12), and it really made a difference. . A Lot of the fins are bent, especially at the top. In addition, R134a refrigerants are not only used in auto air conditioners, they can be used in freezers, aerosol cans, and refrigerators. At 40, it is 35psi, which is a difference of 8.9psi. It would make a big difference at idle ,in traffic!! With that said, I would source the TXV from another source such as NAPA just to avoid any problems. Poc temps desprs van decidir unir els dos webs sota el nom de Xarxa Catal, el conjunt de pgines que oferirien de franc sries doblades i/o subtitulades en catal. Use a strong surfactant like Simple Green or Zep Citrus, and soak the fins on the condensor. Table 1 summarizes the technical characteristics of three potential R134a alternatives. Theres no problem with using R134a in a home air conditioning system because it is a hydrofluorocarbon that doesnt cause environmental harm. 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. If liquid refrigerant were to exit the evaporator. With tube & fin condensors in MVAC applications there is never "too much" airflow. A. Pressure/temperature table for R12, R134a, and R513A is shown in Figure 1. .
Effects of alternative refrigerants on the ejector dimensions for What is needed? Failure to abide by the EPA regulations can result in expensive fines for either you or your service technician. At this time you can still find R12, but, because it is no longer produced, availability is limited to current inventories and the price per pound is greater than R134a. link to How to cut off a Catalytic Converter. The typical scenario here is when the car owner buys an inexpensive retro-fit kit from the local auto parts store. What effect would it have on performance, if any? Jun 19, 2007. R134a compressors are substituted as new to retrofit the R12 system compressor part numbers with different height sealing washers. It is usually sold under the brand name, Freon 12. R1234yf. The aux fan seems to be working fine - it switches on occassionally. So if you car has a large amount of rubber hose, such as a 40 feet with the 911, then you will be re-charging the system often and that is expensive no matter which refrigerant you use. That's a lot isn't it? I would suggest you do stay away from R-134a since with the hot gas bypass of your system (if it is to be just as the original) extremes of temperature and pressure will be very hard on your compressor and the rest of the system. And I lied about the compressor switches on this car - there are 2 switches on the drier - a temp and a pressure switch. I don't believe it is but I had a service guy tell me it needs to be done. -------------------------"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." Any advice appreciated. R134a has a smaller molecule than R12 so R134a will leak out sooner than R12. So if you car has a large amount of rubber hose, such as a 40 feet with the 911, then you will be re-charging the system often and that is expensive no matter which refrigerant you use. 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. When I compare parts, 93 uses one part number and 94 has a different part number. Hmmmm.
A/C receiver difference between R12 and R134a? | NSX Prime Only show this user. 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. Just leave it alone for now. In short, NO! I remember I had the wrong seals and it leaked some oil, so I put some more in.Bohica - I tested the pressures. |. 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. . R-134a XV for R-134a use. The name of the oil is Polyol Ester (POE). However, take note that R134a refrigerants are manufactured specifically for automotive air conditioners. 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. Thanks so much Bohica - you've save me many more hours of fruitless speculation. R12 is highly destructive to the earths ozone layer. This refers to BTU's (heat) moved per pound of refrigerant moved. Gain access to our free AOP (Ask a Professional) Section to get real answers for your questions. The larger line at the expansion valve is the suction line. in /nfs/c05/h04/mnt/113983/domains/toragrafix.com/html/wp-content .
The difference really shows up on the high side. (You must log in or sign up to reply here. This is due to many facts: R134a refrigerant is about 10% less efficient in moving heat than R12! I mean, really a lot. Trinary Pressure Switch quantity. Thus, when the system is running, condensing the CO2 is not a problem. ). 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. There is a lot of differences between the R12 and the R134a fittings, you can't mistake them.
The newer valves and switches will work with both refrigerants. Also, it can be used with all types of compressors. On the other hand, R12 has a global warming potential of 10,910. 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. The next piece of equipment to track down leaks is a leak sniffer. Spray it deep, and let it sit for a few minutes. -------------------------"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." Electric fans do wear out. I'll report back on the aux fan on performance next. I could easily be over at least 2 - 3 ounces over on the oil. I put in a new (not reman) compressor (R4 I believe it is) in my merc 240D, new drier, new expansion valve, new o-rings, nylog. 05-25-2017 02:14 AM. 4 Stars & Up & Up; 3 Stars & Up & Up; 2 Stars & Up . 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. R134a refrigerant is about 10% less efficient in moving heat than R12! Talk about what services you provide. Above this temperature, the saturation pressure of R134a is higher than that of R12; below, it is lower. That is a good thing. The oil is spread all over your system when it is at rest. I don't want to be chasing ghosts. "Howdy, Folks!" It has already been clearly stated that R12 is a chemical that damages the earths ozone layer and shouldnt be released into the environment no matter the circumstance. Depending on which circuit diagram fits your car (cough, no vin list exists) you have either one or two switches controlling the aux fan. 5) A/C System Failure. A final difference is that most (though not all) R-1234yf cars will have a Suction Line Heat Exchanger. Gnats & mosquitos will clog deep. Components Coils, Heaters, Motors, etc. 4) Repeat step 2, making sure it will fit. R 134A is designed for the high demands of an automobile AC and cannot be used on refrigerators due to pressure differences. Even with proper fan operation, missing seals & air dams can effect condensor effeciency. 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? Replacement expansion valve for R134a or R12 A/C refrigerants, with O-ring connections. Disconnect the two hose lines to the compressor, protect the ends from getting dirty. But as there's not a big difference, people say you can suffice with either. Environmental Impact: When R134a escapes into the atmosphere, it contributes to global warming. R12 can move more heat than r134 so when it isn't very hot and the system isn't maxed out you wont be able to tell the difference but when its 110 out and the inside is 140 R12 will cool the cabin temp faster. A capacity curve is shown in figure 2 for relative capacity of R134a vs. R12 for evaporating temperatures from 0F to 50F.