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 R134a has an ozone depletion potential of 0, implying that it has a slight effect on the ozone layer. (You must log in or sign up to reply here. But, what is considered a good temperature differential across the condensor? link to How to cut off a Catalytic Converter. -------------------------1983 Mercedes 240D on R12 and WVO!1192 Mercedes 300D 2.5 R134a1993 Toyota Pickup converted to R134a. What is usually sniffed are all the connections in the system: hoses and compressor, condenser, drier, expansion valve and evaporator fittings. However, it was found to be a very bad gas for the environment. According to Wikipedia, There is such a thing as "r132a" (1,1-Dichloro-2,2-Difluoroethane), however there is no indication of it being a commercially produced refrigerant. Welcome to rxmechanic.com. You either get a system that will function well with R1234yf or get any other type. If he is not in the garage fixing challenging mechanical problems, he is writing automotive repair guides, buyers guides, and car and tools comparisons. Catalog E-1, Thermostatic & Automatic Expansion Valves / Page 1 Table of Contents . 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 . R134a refrigerant fittings are different size. Just leave it alone for now. You should keep in mind that recharging your air conditioner improperly could result in more serious damage. The difference between R12 and r134a is the BTU carrying capability. 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. The aux fan seems to be working fine - it switches on occassionally. Maybe a jerky locker.I cleaned the condensor with the off the shelf ac cleaner stuff from Home Depot that I used on my home evaporator. I have one can left, so maybe a plan can be made. 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. How about evacing 1 pound of refrig from the system, and then putting 1 lb of pure R12 back in? If ambient is 90 (today) and the output of the condensor is 110, that's pretty good isn't it? The higher the ambient temperature the higher the high side pressure. B. Energy usage: R134a is less efficient in cooling compared to R12. Add to cart. Its chemical symbol is CH2FCF3. The system has been previously converted to R-134a. 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. Its duty is to convert toxic gasses produced by the engine into A brake cleaner is a powerful solvent for cleaning dirt from the brakes and other car components. 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. It may take a couple of tries to get things really clean.The laser is usually close on clean surfaces, but I prefer a T/C. Trinary Pressure Switch quantity. Make sure visiually that no large gaps exist that would allow the air to bypass the condensor on the way to the radiator.B. R134a requires a different oil. R-12 is no longer used or produced in many countries and remaining quantities have skyrocketed in price. I used a full can of evap cleaner. You do not have to split up the 5-6 oz of oil and add it to each component, just simply put it all in the compressor as it will move throughout the whole system once the system is operational. I'm thinking I might have put too much oil in the system - everywhere i read had a different amount - the manufacturer of the compressor, the MB factory service manual, online forums. Related products. What effect would it have on performance, if any?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. But as there's not a big difference, people say you can suffice with either. The analysis focuses on Coefficient of Performance for . 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. Since then, the industry standard has been R134a, which is an efficient replacement. But as there's not a big difference, people say you can suffice with either. Skin contact: If the R134a (liquid) comes in contact with your skin, it could cause a burn. Most vehicles manufactured before 1993 have the R12 A/C system. In cases such as this, the required capacity value of the expansion valve with R134a is reduced by 30% (correction factor 1.42). system of 0.33 TR and refrigerant used was R12. Took me a while to figure that one out, and how to say that. Compared with the cost-performance ratio, R507 is 30-40% . That is for the compressor, drier, expansion valve and condenser. #4. Is that why expansion valves are specific to R12 or R134A? The R134a compressor has a 1/8" step in on the high side port. Make sure to get the R12 EXP valve if that is the way you go. At 40, it is 35psi, which is a difference of 8.9psi. Is that why expansion valves are specific to R12 or R134A? This is an electronic tool that sucks in air through a tube and across a sensor. 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. Crap! difference between r12 and r134a expansion valve . It won't be optimal, though. 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. If the water valve is not closing all the way you will have re-heating of the cabin air.The cabin blower was not exactly a powerhouse - it was rated at 200w. When I compare parts, 93 uses one part number and 94 has a different part number. This drop can affect energy consumption since the plant will operate for a longer period or a larger plant will have to be installed. It slowly gets warmer and warmer in the car, even at highway speeds. Nevertheless, if your application is configured only for R12, then you can use it or consider replacing the applications engine. The best replacement for R134a is R1234yf, while R12 refrigerant replacement was R134a. Paul:It is never a waste of my time to chat with someone that understands the problem, and wants to fix it. R-401b is the mixture by weight of 61% R22, 11% R-152a and 28% of R-124. A. Pressure/temperature table for R12, R134a, and R513A is shown in Figure 1. . ambulance tailgate conversion You'll want the expansion valve matched to whatever refrigerant you're using. R12 is CFC: Even though R12 is one of the most commonly used refrigerants, it is CFC. These cheap kits usually have a few cans of R134a (either 12 ounce or 16 ounce), maybe an extra can of refrigerant oil, a few generic R134a charge port adapters and maybe some o-rings. . R404a is a zeotropic blend with a temp glide , because of the mixture of 2 or more refrigerants. Boiling Point: R134a refrigerants boiling point is -26.3C (-15.34F). System has been working fine for a year. The adjusted tension of this spring is the determining factor in the opening and closing of the expansion valve. Should I do the test again with the the aux fan jumpered? A comparison between R12 vs. R134a temperature will show that R12 has a higher temperature than R134a. 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. I'll put the relay on for that. 5) A/C System Failure. 3 ounces? Large temperature difference between expansion valve inlet and outlet oReplace expansion valve Air . 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. You may need to adjust the valve in a bit to get desired superheat. . 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. I don't know where it is getting the switch off command, or why the vent temp drops steadily. evarporator, expansion valve plus flushing out the full system and replacing all the o rings. Be sure to test @ 1500 to 2000 engine rpm, and record the ambient temp as well. 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. R134a and R12 are among the most popular types of refrigerants. 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. Even with proper fan operation, missing seals & air dams can effect condensor effeciency. If there is a resource I should read first to save you time, let me know. might be due to charge or different compressor and age. Best for varieties of operating conditions: Its boiling point is -21.6 Celsius. Flush with a garden hose - do not use a high pressure washer - you can bend the fins flat & damage the condensor.B. With R134a you do not rely on the site glass. R12 and R22 are both now banned by the EPA in the United States. Edited: Sat July 14, 2007 at 10:22 PM by fonebone. The larger line at the expansion valve is the suction line. Thanks for the input. I'm having the same concern. 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. 10,000BTU conduction heating? 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. But, if your old compressor has lock-up or if your current expansion valve is not functional it would wise to replace the expansion valve with a valve designed for R134a. Thus, when the system is running, condensing the CO2 is not a problem. It is mixed with the freon for the most part, and does accumulate in all components in small amounts. Besides, its technology has been tested and trusted. But R22 is almost equally damaging. But I don't want to waste your time. Minor adjustments to the expansion valve and other controls may be necessary for some plans. It runs between the condenser outlet, receiver/drier unit and expansion valve at the firewall. Or is there always room for improvement, the more the merrier. If the charge is low the compressor will cycle on/off in the max AC position. If your a/c system is empty/low on refrigerant, if your system has a leak or if you need to open the system, then now is the time to decide which refrigerant you want to use. If you have a perfectly operating system using R12 you do not have to drop what you are doing and convert to R134a. We, the Rxmechanic team, have presented a well-detailed comparison of R134a vs. R12. The newer valves and switches will work with both refrigerants. For R12, its mineral oil. Since 2010, all home AC systems manufactured use a refrigerant like R134a that has zero ozone depletion potential (ODP). The larger fitting goes on the discharge port and the smaller fitting goes on the suction line or compressor inlet / suction port. When you add fluorescent tracer dye to with the refrigerant oil it helps to track down leaks that push oil out of the system. What was the ambient when you took that reading?Jumpering the aux fan is a common thing here in the desert. So the steps involved are cleaning out the old oil, replacing all the O-rings, replacing the dryer, replacing the expansion valve, and converting the high and low side connectors from Schrader to quick connect valves. Its chemical symbol is CCl2F2. You can use the R134a retrofit capacity chart for this purpose. R134a vs R12 refrigerant? I recommend replacing the expansion valve when you do the swap. R134a compressors are substituted as new to retrofit the R12 system compressor part numbers with different height sealing washers. and he synthesized R-134a in 1936, 5 years after R-12 was . Use strips of foam to couple the two heat exchangers if necessary.B. It's actually a reaction with chlorine in the mineral oil that may have been absorbed and leftover from the old R-12. 2001-2023 Griffiths Technical Inc. All Rights Reserved. Could that be screwing up the systems performance?Anyway, when I installed the system, the new TXV (is that short for expansion valve?) 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. Thanks again. 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. 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. Agram a retevis rt22 password i bastrop county district clerk records el material que oferim als nostres webs. R134a systems operate at higher discharge-side pressures than R12, which can cause compressor seals to leak. 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. July 3, 2022July 3, 2022. Statisicaly your friend was lucky. In addition, R134a refrigerants are not only used in auto air conditioners, they can be used in freezers, aerosol cans, and refrigerators. Talk about what services you provide. 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. 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.
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