R134a is the most widely accepted alternative automotive refrigerant used to replace R12. Talk about what services you provide. I remember I had the wrong seals and it leaked some oil, so I put some more in.Bohica - I tested the pressures. In short, NO! You either get a system that will function well with R1234yf or get any other type. The difference really shows up on the high side. R12 and R22 are both now banned by the EPA in the United States. The typical scenario here is when the car owner buys an inexpensive retro-fit kit from the local auto parts store. Make sure to wear safety gloves, goggles, and shoes when theres a possibility of exposure to the chemical (R134a). Edited: Sat July 14, 2007 at 10:22 PM by fonebone. Very nice! Even if the system leaks, repairing the leaks and recharging it with R-12 is usually the best repair alternative. PaulJerky King -------------------------1983 Mercedes 240D on R12 and WVO!1192 Mercedes 300D 2.5 R134a1993 Toyota Pickup converted to R134a. There is a lot of differences between the R12 and the R134a fittings, you can't mistake them. George Bray on Wed August 31, 2005 5:03 PM I believe the optimum supercool setting will vary slightly between an expansion valve for an R12, as compared to R134a, system. A thermostatic expansion valve (TXV) (see Figure 1) is a refrigeration and air conditioning throttling device that controls the amount of refrigerant liquid injected into a system's evaporatorbased on the evaporator outlet temperature and pressurecalled the superheat. 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. Is that why expansion valves are specific to R12 or R134A? The reason is that the vehicles, for instance, manufactured currently configure the engine for R1234yf refrigerant, making no provision for replacement. The original CFC expansion valve used for R12 needs to be replaced with an HFC one for 134a to feed the evaporator correctly. James10952001. That is for the compressor, drier, expansion valve and condenser. With new R12 no longer being manufactured, the market price soared to $100/pound. You can spend long evenings reading about the differences between the two refrigerants. And I lied about the compressor switches on this car - there are 2 switches on the drier - a temp and a pressure switch. $21 . With that said, I would source the TXV from another source such as NAPA just to avoid any problems. 4) Inconsistent Airflow. You'll want the expansion valve matched to whatever refrigerant you're using. First, differences in physical properties: 1, insoluble R12 compressor oil is used (to reduce the lubricant) 2, dissolved sealing materials are used (resulting in refrigerant leakage) 3, easy to damp (so easy to internal . The OEM spec is 2300 rpm @ 12.6v (engine stopped fully charged battery). With R134a you do not rely on the site glass. Why wait for 200f on the engine coolant to start the fan? Ensure you contact a professional mechanic to do the work for you so you dont end up incurring more costs for yourself. is good, then I should be looking elsewhere? 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. At 40, it is 35psi, which is a difference of 8.9psi. 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. As per their results . ~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446. What is usually sniffed are all the connections in the system: hoses and compressor, condenser, drier, expansion valve and evaporator fittings. Carefully study the chart and compare the following: To a large extent, the choice is up to you. Yes, this was a smokers car. Heres R12 vs. R134a pressure chart. 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. A. Pressure/temperature plot of R134a vs. R12 is shown in figure 1. I just got some hi/lo side gauges so I'm going to take readings, if they are needed. Generally this works well for the whole system. R134a requires a different oil. Thanks so much Bohica - you've save me many more hours of fruitless speculation. A lower GWP alternative to R-134a had to be found and thus we have the new 1234yf. Also, R134a cylinders are light-blue in color. 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. 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. 2) Frost on the Vents. Therefore, the higher the factor of the chemical (compound), the greater its effect on global warming. Thus, when the system is running, condensing the CO2 is not a problem. 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. _____ 2012 E350 2006 Callaway SC560 . After the optimum refrigerant charge is determined the car should be test driven to check for performance of the system. R1234yf is more environmentally friendly and has a global warming potential of 4. There is NO reason to retrofit a vehicle to R-134a as long as the R-12 system is cooling properly and contains a normal charge of refrigerant. Are you sure you have an R4? difference between r12 and r134a expansion valve why is miles raney not on homestead rescue June 21, 2022. manila mayor candidates 2022 Also, would a genuine R12 TXV be better, or is it too marginal to worry about?I think I should do the FSM test for performance - they have a graph with ambient temp and a/c temp. Expansion Valves Catalog E-1, July 2012. Moreso, it had been banned. These two refrigerants are the older types and are not used in newer refrigeration and air conditioning systems. 1) Warm Air From Vents. R12 contains a chemical called chlorine that destroys the ozone layer, thereby causing potential environmental risk. But R22 is almost equally damaging. He used thermostatic expansion valve and Capillary tube for analysis with R12. -------------------------1983 Mercedes 240D on R12 and WVO!1192 Mercedes 300D 2.5 R134a1993 Toyota Pickup converted to R134a. Just because the radiator does not boil people assume that the cooling system is ok. The only material difference between automotive A/C and a window A/C unit or refrigerator is that in the home application, the components are all inside the same rectangular box, but in the automotive application, the components are distributed throughout the car. It cycles on off in med (or low for that matter)Gotta tell ya. The major reason for the replacement of R12 with R134a was to curb future greenhouse effects. It's not just the poor performance - the cooling just stops working after a while. Should I do the test again with the the aux fan jumpered? A. Pressure/temperature table for R12, R134a, and R513A is shown in Figure 1. . However, take note that R134a refrigerants are manufactured specifically for automotive air conditioners. Can I order a valve based on the original eaton number? Recharge the compressor with a/c ester oil and a tracer dye. Theres no problem with using R134a in a home air conditioning system because it is a hydrofluorocarbon that doesnt cause environmental harm. B. 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. The exact amount will vary with each car. R-134a is widely believed to be the most acceptable R12 substitute. Plus, not releasing the chemical into the air is morally justifiable. It is mixed with the freon for the most part, and does accumulate in all components in small amounts. I'm having the same concern. You may have heard of a friend that did the job himself with borrowed equipment and 12 or 16 ounce cans of refrigerant. Different correction factors are applied to other refrigerants. When I compare parts, 93 uses one part number and 94 has a different part number. All fans must work at 100% of the OEM rating. The money you will save by will pay for the R12. The car never overheats, if that has any import. Condensers designed to release greater amounts of heat help to expel the greater amount of heat which R134a removes from the cars interior. What is needed? Look deep into the fins. Whether R134a performs as well as R12 in any given a/c system depends upon system components and the amount of R134a used. Reattach the hose lines using new R134a compatible o-rings, lightly lubricate with compressor oil. Its chemical symbol is CCl2F2. So you could likely put off buying those new hoses just a bit longer if you wanted. We sometimes use a relay switched from the compressor clutch to run fans. The original rubber a/c hose lines in your car will leak out R12 through the hoses lining. Right now you know you have a bit too much, but with a CR4P compressor this is an insurance policy. R12 is otherwise called dichlorodifluoromethane is a colorless gas (chlorofluorocarbon halomethane (CPC) that is used as an aerosol spray propellant and a refrigerant, and is soluble in organic solvents. If he is not in the garage fixing challenging mechanical problems, he is writing automotive repair guides, buyers guides, and car and tools comparisons. compressor, condenser, evaporator and expansion valve are specifically designed for use with R134a. So I probably put the highest suggested amount in to be safe. 42 (at best) w/ 134A in 2000 isuzu trooper. Its chemical symbol is CH2FCF3. Replacement expansion valve for R134a or R12 A/C refrigerants, with O-ring connections. 1) Look Here at the available sizes of PF condensors.2) Go look at your vehicle's condensor & mounting. 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. 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. It can be used applications like walk-in coolers, food and dairy display cases, domestic refrigerators, and beverage dispensers and vending machines. ~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446. I don't want to be chasing ghosts. They have no moving parts. 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. Even with proper fan operation, missing seals & air dams can effect condensor effeciency. 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. It would make a big difference at idle ,in traffic!! Swapping the components isnt a herculean task, but recharging the AC is a challenge. . R134a refrigerant is lighter than R12. If liquid refrigerant were to exit the evaporator. Performance doesn't seem to have improved. Inasmuch as R134a has a global warming potential thats over 1000 times more threatening than carbon dioxide, its better than R12. of refrigerant insulation tape. At 2000rpm, windows open, highest fan, hi pressure stabilized at 225 psi, low 25psi.Ambient 81F, vent 61F. 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. There are R134a specific valves that operate at a slightly different pressure, but not for any "old" automotive application that I'm aware of. The oil is spread all over your system when it is at rest. 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. A. Pressure/temperature table for R12, R134a, and R513A is shown in Figure 1. . R134a has a smaller molecule than R12 so R134a will leak out sooner than R12. I've straightened the fans I can and sprayed simple green on it, let it soak then hosed it down well. 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. 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. About four or five years ago, I guy with an MB came here with the same problem, that tread was over six pages long. bokoen1 hoi4 the great purge / meryl and maks dancing with the stars / difference between r12 and r134a expansion valve. 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. Nick, I hear you - there maybe nothing to do here. 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. The expansion valve(Tx) is in the car at the inlet line to the evaporator with compressors you best get advice from an ac specialist shop as the differences could be the gas that it pumps some systems use R12 and others use R134a or later gas yes R1234yf Freon gas can be replaced by R134a; the newer systems were designed with this in mind so no, there will be no damage to the compressor but some time in . 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 recently created this blog site to enable us to share our knowledge with other automotive mechanics and car owners. I am ordering new parts, and planning to convert my system to R-134a. The evap is hard to get at. But as there's not a big difference, people say you can suffice with either. The MB chart shows 360 psi with R12 in some conditions. 30 deg is pretty coldSystems generally run between 40 and 43 deg. Hot coolant migrates up through the core by convection (is that the word? Minor adjustments to the expansion valve and other controls may be necessary for some plans. Interestingly, theres one oil type that works perfectly with both types of refrigerants. Als nostres webs oferimOne Piece,Doctor Who,Torchwood, El Detectiu ConaniSlam Dunkdoblats en catal. The only difference I can imagine would be the recharge connection. Does it matter - assuming both are new & uncontaminated? Remember, being aluminum, they lower the temps better, and do not pass off as much heat to the radiator, which then makes it's job easier and lowers underhood temps (besides lowering vent temps inside the car). A capacity curve is shown in figure 2 for relative capacity of R134a vs. R12 for evaporating temperatures from 0F to 50F. If you have a York, and it is equipped with service valves, you can check & adjust the oil level without discharging the system. I used a full can of evap cleaner. By after changing just about everything, he got what was termed, satisfactory cooling. It didn't seem too dirty though - I don't think it is the problem, but I could be wrong. So that indicates it is cooling well there doesn't it? R12 was once used in many air conditioning units as a refrigerant or cooling agent. The system will be checked for gross leaks while under vacuum. 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. But R22 is almost equally damaging. evarporator, expansion valve plus flushing out the full system and replacing all the o rings. I have one can left, so maybe a plan can be made. I have just bought gauges. Don't like the sound of custom parallel condensor. -------------------------"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 ALWAYS want to know the pressure readings! 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. Electric fans do wear out. in /nfs/c05/h04/mnt/113983/domains/toragrafix.com/html/wp-content . Most importantly, the oil used in the plant must always be compatible with the refrigerant used. You can use this space to go into a little more detail about your company. 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. I bought a relay to put on it connected to the compressor clutch. And no, you cannot "drain' excess oil out. The R134a compressor has a 1/8" step in on the high side port. = R134a Charge Level. In sum, R12 has done more bad than good. How is 1234yf different from . GWP is a measurement of Greenhouse Gases and their effect on Global Warming. 5) A/C System Failure. You do not want to exceed the systems high side recommendations. . If ambient is 90 (today) and the output of the condensor is 110, that's pretty good isn't it? Look at where the lines will end up. The smoking question & vent airflow indicate that the evaporator is fairly clean - and you are aware of the importance of that.The heater valve stops the flow, but there is always some conduction heating. For instance at 25 F the pressure of R-12 is 24.6 PSI and the pressure of R-134a is 22.1 PSI. What is a T/C?4. might be due to charge or different compressor and age. In this study, without the need for major modifications to the bus air conditioner, the variation of the ejector dimensions according to different parameters has been investigated in the case of using the R1234yf, R1234ze(E), or R600a refrigerants, which may be a substitute for R134a as a refrigerant due to . R134a is called tetrafluoroethane (HFC). Below are the major differences between R134a and R12: The chemical composition of R12 and R134a differ. RULES for AOP - Owner Assistance and Contractors, Energy Efficiency and Building Performance Discussion NEW, Carnak Zone/Locked Areas - For Professional Member Only, How To Become a Pro and Rules For Pro Members, Pro Forum: Refrigerants and EPA regulations **NEW, Pro Forum: Residential Refrigeration and Appliances **NEW, Pro Forum: Equipment Recalls and Bulletins **NEW, Pro's Forum: Building Science Discussions, Educational Forums - Open for all in the industry, Welcome to HVAC-Talk's Educational Forums, How to Submit Links, Articles and Quiz Questions, Frequently Asked Questions About Submissions, Physics, Thermodynamics, Fluid Flow and Combustion, Educational, Training & Reference Information, Manufacturer's Technical Information Links, Electrical Theory, Circuits and Electronics, HVACR Equipment, Components & Accessories, Accessories Humidifiers, Air Cleaners, HRUs, Fans, Filters, etc. I recommend replacing the expansion valve when you do the swap. However, theyre still used in older plants, systems, and the automotive industry. For example, if your system originally had 36 ounces of R12 then you multiply that by .80 and you have 29 ounce of R134a. R12 is heavier than R134a and has smaller molecules. What effect would it have on performance, if any? Related products. Therefore, its most suitable for both commercial and domestic environments. Thanks for the input. An extra half ounce? That way I will have reduced the oil by about 1/3 (assuming the oil is mixed evenly through the system). Spray it deep, and let it sit for a few minutes. If you you dont have the free time to play then you are better off to pay a technician. Your average garage that works on a/c on the side probably would not have this. You can use the R134a retrofit capacity chart for this purpose. We say generally because the vehicle manufacturer may have a formula already worked out for the R134a conversion process. Compared with the cost-performance ratio, R507 is 30-40% . Low refrigerating effect per pound: In comparison to other refrigerants, the refrigerating effect of R12 per pound is low. Inhalation of vapor: Inhaling a large amount of R134a vapor can lead to drowsiness, temporary nervous system depression, and lethargy. Can I use the one for the R-12? Do I leave the orignal condensor in, etc?Thanks. A comparison between R12 vs. R134a temperature will show that R12 has a higher temperature than R134a. Superheat you can consider to be the additional amount of heat. 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. What is the refrigerant property involved that has caused this? Questions About Becoming A Professional Member? The aux fan seems to be working fine - it switches on occassionally. The cure is to use the newer R134a compressors is sealing washers that are different thickness. R12, on the other hand, has an ozone depletion potential of 1, implying that it can damage the ozone layer. of coiled cap tube on VCR system with R134a. Then at least I'd know really where I am on it. It does not "pool" to any degree in a large amount anywhere. Yes it will work with either Refrigerant! Be sure to test @ 1500 to 2000 engine rpm, and record the ambient temp as well. 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. Once you have replaced the OEM condensor with a PF unit, you will need to make custom hoses to mate with your OEM system. When the sensor detects the refrigerant leak the sniffers lights glow and the sniffer makes a noise. Note that passwords are case-sensitive. If you are replacing other system components, such as condensers, driers or hoses, you may need to add more a/c refrigerant oil to the system. You do not however need to replace all the o-rings or seals for a simple conversion, it is simply a logical thing to do when and if the time comes to work or replace certain components because of age issues. It won't be optimal, though. Stability: RR12 doesnt disintegrate even under extreme operating conditions. Since the hose is the stock hose, you cannot tell what refrigerant is inside. They would then make short "jumper hoses" to connect to the existing stock hoses, refit your old fan if there is a "pusher" fan, and recharge to specs. Use strips of foam to couple the two heat exchangers if necessary.B. With the A/c off hi and lo were both at 105psi. 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. Get to the point where I can walk without crutches2. We've updated our forums!Click here to visit the new forum, Year: 1991Make: Jaguar Model: XJ6Engine Size: 4.0. 2001-2023 Griffiths Technical Inc. All Rights Reserved. R12 is simply too expensive for a 25+ year old A/C system. A/C systems designed to use R-12 will cool best when charged with R-12 refrigerant. On the other hand, R12 has a global warming potential of 10,910. R12 systems used mineral oil, but unfortunately mineral oil doesn't dissolve in R134a. Its chemical symbol is CCl2F2. In a comparison between R12 vs R134a vs R1234yf, R1234yf will pass as the best refrigerant. You will be fine with a 134a-compatible TXV running R12. Depending on which circuit diagram fits your car (cough, no vin list exists) you have either one or two switches controlling the aux fan. 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. gital control scheme. Could that be screwing up the systems performance?Anyway, when I installed the system, the new TXV (is that short for expansion valve?) The difference between R12 and R134a TEV (exp valves) is primarily the 'superheat'. Unfortunately, the R12 refrigerant doesnt always blow cold air. a 50f delta across the condensor is good, but I suspect that is an idle reading. Bookmarks: Digg; del . Helical and Serpentine coils. 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. ). I don't think it has any air dams or seals, I'll check to make sure. July 3, 2022July 3, 2022. R134a and R12 are both refrigerants used in vehicle air conditioning systems. Skin contact: If the R134a (liquid) comes in contact with your skin, it could cause a burn. 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. What was the ambient when you took that reading?Jumpering the aux fan is a common thing here in the desert. Quick View. Figure 2 shows the different phases and pressures the refrigerant . Edited: Tue July 17, 2007 at 3:25 AM by bohica2xo, I believe there is only one switch - the refrigerant switch. Make sure visiually that no large gaps exist that would allow the air to bypass the condensor on the way to the radiator.B. I've done the FSM test and with 81F ambient, the vent should be 50F. 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. This kit comes complete with Expansion valve, o-ring kit, and 1ft. The substitute that we used for R-12 was the new HFC called R-134a. Since then, the industry standard has been R134a, which is an efficient replacement. A slow loss of cooling at city speeds is usually related to condensor capacity & airflow issues. Theres no doubt that R12 refrigerant is one of the first compounds manufactured for the air conditioning and refrigeration world, but it had to be banned. Energy usage: R134a is less efficient in cooling compared to R12. You may need to adjust the valve in a bit to get desired superheat. Its cylinders are colored white. BTW, I use a stick thermo in the vents and the laser on the condenser. Temp switch works the aux fan. 2022 nba 2k22 starting a fashion label signing the designer, a difference between r12 and r134a expansion valve, 2020 white paper of the church of pentecost, Chime Mobile Check Deposit Funds Availability, Why Does James Kill Donald In The Vanishing, nba 2k22 starting a fashion label signing the designer. I had a 1991 BMW switched to 134a by just changing the low pressure charging valve, flushing and refilling with 134 (maybe with 10% . All pre-97 XJs use systems with the same basic operating principle, although the parts do change a bit. Its among the greenhouse gases and will keep adding the current problem of heat not leaving the earths atmosphere. 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. Is there a source of valves by, say, eaton number? The problem with not being an expert is that you don't know what is important and what's not. The name of the oil is Polyol Ester (POE). 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. Participate in over 40 different forums and search/browse from nearly 3 million posts. Safety: R134a is safe to use as its non-flammable and cant explode. There are significant differences between R12, R134a, and R513A, which must be considered when handling, processing, applying, or retrofitting with these refrigerants. The symbol implies that R12 is a composite of carbon, chlorine, and fluorine. Warning: "continue" targeting switch is equivalent to "break".Did you mean to use "continue 2"? Hmmmm. -------------------------1983 Mercedes 240D on R12 and WVO!1192 Mercedes 300D 2.5 R134a1993 Toyota Pickup converted to R134a, Hi pdrayton- If you can remember the oil capacity that you found in all your research and post that, then bohica and others can have a better idea if you have too much; see if you can find that info! This is 11F off the FSM performance graph - vent should be around 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. In the automotive world, the replacement for R12 was R134a. The mechanical fan & clutch should be checked as well. Can I use the one for the R-12? Is there a difference between a R134a expansion valve and an R12 TXV? AFAIK, there is no clutch on the engine fan on the 240D. absorb by the evaporator to insure all liquid refrigerant entering the evaporator. -------------------------"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 consider the the various types alternative refrigerants that are illegal or not approved to be in two sectors: non-flammables and flammables. I have some experience with auto a/c but not too much. However, if it is taken close to a fire flame or any electrical heating element, it disintegrates into toxic products. The original expansion valves work very well with R134a. This drop can affect energy consumption since the plant will operate for a longer period or a larger plant will have to be installed. There are three different refrigerants officially sanctioned by the EPA for automotive usage: r-12, r-. The primary function of the design engineer is to make things difficult for the fabricator and impossible for the serviceman.
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