Formula: (R12 Charge Specification x 0.9) - 0.25 lbs. A Lot of the fins are bent, especially at the top. Table 1 summarizes the technical characteristics of three potential R134a alternatives. Refrigerators generally utilize R22, R32, or 410A-based coolants as their cooling agent. We consider the the various types alternative refrigerants that are illegal or not approved to be in two sectors: non-flammables and flammables. Is checking the temperature of the in and out of the condensor not the easiest way to tell if it is doing a good job or not? 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. Have a look in the FAQ Section, and look for "Fan clutches & testing them". Since the hose is the stock hose, you cannot tell what refrigerant is inside. They can be mounted quite easy,and there is a mounting kit that helps to hang it. 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. How to Convert R12 to R22 | eHow Are r12 and r134 fittings different? Boiling Point: R134a refrigerants boiling point is -26.3C (-15.34F). They might say for instance, add 3-4 oz of oil to the compressor, 1 oz of oil for when you replace a drier, 2 oz oil for the evaporator and so on. The problem with not being an expert is that you don't know what is important and what's not. Use a drop light in the engine bay, and check the air path from the front of the car at night. 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 . Use strips of foam to couple the two heat exchangers if necessary.B. 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. The cost of recharging the air conditioner is between $150 to $500. Get to the point where I can walk without crutches2. By after changing just about everything, he got what was termed, satisfactory cooling. Yep, definately not a meat locker. R-134A has a slightly lower pressure at evaporator temperatures (30-40 degrees), but R-134a also has a much higher pressure at condenser temperatures (120-150 degrees). Then I'll put the ball valve in on the coolant and test it and see what we have. R134a and R12 are both refrigerants used in vehicle air conditioning systems. A/C R12 to R134a Conversion Success | IH8MUD Forum I would not do a 134a conversion without a PF condensor. Though - the valve for a 1991 says R12 on it, and for a 1994, it says R-134a. This is a great space to write long text about your company and your services. Is there a difference in the expansion valve for R12 as opposed to R-134a? Back in that era, my business associates drove those things, brand new, and maybe I should take my Cadillac instead, no they wouldn't be caught dead in a Caddy, people of our esteem should be driving an MB. By using a qualified a/c shop with the proper equipment you odds are in your favor of having the job done correctly the first time. Also the new quick connect fittings for the high & low side. This drop can affect energy consumption since the plant will operate for a longer period or a larger plant will have to be installed. system of 0.33 TR and refrigerant used was R12. Instead, top off R12 with R134a refrigerant. evarporator, expansion valve plus flushing out the full system and replacing all the o rings. 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). Thanks so much Bohica - you've save me many more hours of fruitless speculation. R1234yf is more environmentally friendly and has a global warming potential of 4. -------------------------"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." 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. Trinary Pressure Switch $ 39.99. Bookmarks: Digg; del . Compressor. Like say half a can or so recharge come springtime warm weather or something. Took me a while to figure that one out, and how to say that. The global warming potential of R134a is 1430. 5. This is not to say that one of these small retro-fit kits cant be used, however to be used wisely. I have the original (R12) style expansion valve in the Maverick AC system. How dumb!I will jumper the aux fan and redo the test. If you have the work done, be sure you find a true "A/C" shop that can make up lines. of coiled cap tube on VCR system with R134a. 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. R134a is called tetrafluoroethane (HFC). You do not need to replace the expansion valve in most cases. It runs between the condenser outlet, receiver/drier unit and expansion valve at the firewall. R12 systems used mineral oil, but unfortunately mineral oil doesn't dissolve in R134a. If the system was upgraded by a professional it should have an upgrade sticker. R134a systems operate at higher discharge-side pressures than R12, which can cause compressor seals to leak. Hence, the effect of R12 on global warming is up to 10,000 times higher than carbon dioxide. A discussion of the relationship between valve capacities and superheat set-tings can be found in Bulletin 10-9. how to get to disney springs from boardwalk / bb dakota plaid jacket canada / difference between r12 and r134a expansion valve. 3) A TXV optimized for 134a will be ok with R12. In a comparison between R12 vs R134a vs R1234yf, R1234yf will pass as the best refrigerant. of refrigerant insulation tape. had writing on the side that said R134a. What is needed? He used thermostatic expansion valve and Capillary tube for analysis with R12. 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. difference between r12 and r134a expansion valve why is miles raney not on homestead rescue June 21, 2022. manila mayor candidates 2022 This is 11F off the FSM performance graph - vent should be around 50F. R134a compressors are substituted as new to retrofit the R12 system compressor part numbers with different height sealing washers. R12 and R134 are of different chemistry. R-12 vs R-134a Hose - Pelican Parts Forums Generally the system will be initially charged with approximately 80% to 85% of the original amount of R12, using R134a. It was later found that R-134a had a very high Global Warming Potential, or GWP, number. When the temperature is reduced to-7C or below, the plants ability to cool the airdrops significantly. Expansion valves are an active device, they regulate the flow of refrigerant to the evaporator depending on evaporator temperature. Also, if you want to know what happens if you put R134a in an R12 system, you should first confirm if the R12 system can be replaced or if the refrigerants can be mixed. Its cylinders are colored white. 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. Ask Our Pros-Owner Assistance - NO DIY advice will be given. I think the way to go here is1. Note that passwords are case-sensitive. Tech Talk - Differences between R-1234yf and R-134a - FJC Inc ESP when a compressor has frozen. Replace the drier with a drier that has a desiccant that is R134a compatible, use new R134a o-rings. There are significant differences between R12, R134a, and R513A, which must be considered when handling, processing, applying, or retrofitting with these refrigerants. The condenser water inlet temperature and flow rate are controlled with the use of a . I'll report back on the aux fan on performance next. 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. 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. Replied by Rich928 on topic R12 or R134a. I've done the FSM test and with 81F ambient, the vent should be 50F. But R22 is almost equally damaging. 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. Effects of alternative refrigerants on the ejector dimensions for With the knowledge of the differences, youll be able to draw a comparison between R12 vs R134a efficiency. 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. Using R134a requires that Polyolester (POE) lubricant must be used in the compressor. 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. So, instead of using R12, other better options include R401b, R134a, R401a, etc. Further production of R12 was banned in some developed countries by the Montreal Protocol because of its harsh effect on the ozone layer. 1) Look Here at the available sizes of PF condensors.2) Go look at your vehicle's condensor & mounting. Answer: OK, I'll bite. MB has specfic test parameters for performance, but you can always test at max load - doors open fan on highest speed.The oil overcharge looks like a parabolic curve. 05-25-2017 02:14 AM. Vent temperatures slowly go down to around 50F with hi speed driving. You'll want the expansion valve matched to whatever refrigerant you're using. difference between r12 and r134a expansion valve Just leave it alone for now. It's helluva humid and hot here in north florida, and I drive around all day for my job. I don't know where it is getting the switch off command, or why the vent temp drops steadily. Safe but sorry! 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. As noted, measure up front as best as you can to get as close to the aftermarket dim. The newer valves and switches will work with both refrigerants. . A/C receiver difference between R12 and R134a? | NSX Prime Since then, the industry standard has been R134a, which is an efficient replacement. Next I'll jumper the aux fan. Expansion Valve for R134a? | Team Chevelle About four or five years ago, I guy with an MB came here with the same problem, that tread was over six pages long. In practice this means that the car can overheat and the aux fan will stay off! The non-flammables can have R22 type gas which is not compatible with most rubber hoses or they have gases that contribute to global warming. If there is no pusher fan, and you have the room, put one in. The exact amount will vary with each car. link to How to cut off a Catalytic Converter. But as there's not a big difference, people say you can suffice with either. That is for the compressor, drier, expansion valve and condenser. CLUTCH CYCLING SWITCH. The R134a compressor has a 1/8" step in on the high side port. It is mixed with the freon for the most part, and does accumulate in all components in small amounts. Compatible with multiple applications: The major reason for the introduction of R134a was to replace R12, so it functions perfectly in the same range of applications like rotary, screw, and centrifugal compressors for air conditioning and refrigeration. When you add fluorescent tracer dye to with the refrigerant oil it helps to track down leaks that push oil out of the system. R134a has the chemical formula CF3CH2F and is known as tetrafluoroethane. sparkee said: Thanks for the Service Bulletin. R-134a XV for R-134a use. How thermostatic expansion valves work | Danfoss american sniper longest shot; how to adjust sunsetter awning arms; pastor jeremy roberts texas. (You must log in or sign up to reply here. The aux fan seems to be working fine - it switches on occassionally. Warning: "continue" targeting switch is equivalent to "break".Did you mean to use "continue 2"? 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. Unfortunately, the R12 refrigerant doesnt always blow cold air. There is more to check.The evaporator must be clean as well as the condensor - was this a smoker's car?You should check the water control valve for the heater core. Anyone know what happens when an R12 expansion valve is used in a system charged with R134A? Even if the system leaks, repairing the leaks and recharging it with R-12 is usually the best repair alternative. Nick, I hear you - there maybe nothing to do here. Therefore, the R12 refrigerant is illegal, and emitting it is illegal. At 2000rpm, windows open, highest fan, hi pressure stabilized at 225 psi, low 25psi.Ambient 81F, vent 61F. Neuro spine Super Speciality Clinic - Above Apollo Pharmacy, Bangarpet Circle, Kolar - Bangarpet Road, Kolar Town. "Jerky Locker" LMAO I am using that one in the future!Florida = BUGS! 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. 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. maintain the A/C of older cars. Plus, not releasing the chemical into the air is morally justifiable. However, if it is taken close to a fire flame or any electrical heating element, it disintegrates into toxic products. What is a T/C?4. R404a for freezing of product. Then when it is switched off for a few minutes and then back on, the air cools again. PDF COMPARISON OF Rl34a AND R12 REFRIGERANTS IN A VAPOUR - AIVC
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