Is there a difference in the expansion valve for R12 as opposed to R-134a? I've done the FSM test and with 81F ambient, the vent should be 50F. sparkee said: Thanks for the Service Bulletin. 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. The mechanical fan & clutch should be checked as well. R 134A is designed for the high demands of an automobile AC and cannot be used on refrigerators due to pressure differences. Make sure to get the R12 EXP valve if that is the way you go. This means that it has a high potential of causing depletion to the ozone layer. ~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446. This is the part that controls the system pressures. You do not want to exceed the systems high side recommendations. Make sure visiually that no large gaps exist that would allow the air to bypass the condensor on the way to the radiator.B. Since you will be using less R134a than R12 you do not want to rely on the driers site glass to determine if the system is full. Thanks for the input. It can be used applications like walk-in coolers, food and dairy display cases, domestic refrigerators, and beverage dispensers and vending machines. Its among the greenhouse gases and will keep adding the current problem of heat not leaving the earths atmosphere. It does not "pool" to any degree in a large amount anywhere. Nick, I hear you - there maybe nothing to do here. But I don't want to waste your time. 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. I'm thinking of jumping the temp switch and leaving the fan on to see how it does. The symbol implies that R12 is a composite of carbon, chlorine, and fluorine. Took me a while to figure that one out, and how to say that. 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. #4. Nevertheless, if your application is configured only for R12, then you can use it or consider replacing the applications engine. Rules governing changing from the former to the latter differ between countries. #13. The condenser water inlet temperature and flow rate are controlled with the use of a . link to How to cut off a Catalytic Converter. I don't know where it is getting the switch off command, or why the vent temp drops steadily. R134a is called tetrafluoroethane (HFC). All fans must work at 100% of the OEM rating. The difference between R12 and r134a is the BTU carrying capability. Your old hoses of course will not fit. We, the Rxmechanic team, have presented a well-detailed comparison of R134a vs. R12. Accessories Pumps, Cooling Towers, Evap Condensers, etc, Components Valves, Motors, Condensers, Evaporators, etc, Duct Systems Design, Installation & Practice, Piping Systems Design, Installation & Practice, Control System Design, Installation & Practice, Pro's Forum: National Electrical Code (NEC), Pro's Forum: Calculations & Electrical Theory, Pro's Forum: Electrical Business & Marketing. I just got some hi/lo side gauges so I'm going to take readings, if they are needed. 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. I think so. 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. Most of all the differences gravitate to longevity, functionality, and safety. Some compressor manufacturers or OEMs suggest PAG type oil for R134a. 4) Inconsistent Airflow. That's a lot isn't it? Where would I get some basic info on it, I know nothing about it. . But R22 is almost equally damaging. Hence, the effect of R12 on global warming is up to 10,000 times higher than carbon dioxide. Generally this works well for the whole system. This is a great space to write long text about your company and your services. It is usually sold under the brand name, Freon 12. Just leave it alone for now. Rich Membership Chairman Using R134a in an R12 system will cause the oil not to move with the refrigerant, causing a system failure and probably won't even cool the system well, if at all. You either get a system that will function well with R1234yf or get any other type. In practice this means that the car can overheat and the aux fan will stay off! 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. 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. Recovery & flushing is the only way out of an oil overcharge in your vehicle.B. _____ 2012 E350 2006 Callaway SC560 . The reason is that the vehicles, for instance, manufactured currently configure the engine for R1234yf refrigerant, making no provision for replacement. 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. In more serious, it could result in cardiac irregularities or death. R134a is NOT less efficient than R12 Actually R134a is more efficient. CLUTCH CYCLING SWITCH. Still, I have some simple green, so may as well give it a go. The AC usually does not work at all. We consider the the various types alternative refrigerants that are illegal or not approved to be in two sectors: non-flammables and flammables. 1) Look Here at the available sizes of PF condensors.2) Go look at your vehicle's condensor & mounting. 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. Boiling Point: R134a refrigerants boiling point is -26.3C (-15.34F). VerticalScope Inc. All Rights Reserved. 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. Sense ells no existirem. a 50f delta across the condensor is good, but I suspect that is an idle reading. Is there a graph? Quick View. Put a relay on the compressor clutch to the aux fan (I like that idea - makes a lot of sense)How does that sound? Since 2010, all home AC systems manufactured use a refrigerant like R134a that has zero ozone depletion potential (ODP). 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. don't know enough about the subject to explain the choices.However, a few days ago I called the dealer to see about an OEM TEV and they said something that made me feel a little bit better; the same part number superceded every application back to the '60s, and that they couldn't do that without engineering signing off on it.Still, I would feel a lot better if I could see something written officially that compared the flow characteristics and performance of r12 and 134a TEVs are concluded that they were interchangeable in automotive applications.If someone knows of such a document I would sleep much better!Walt Edited: Mon September 12, 2005 at 8:13 PM by wamcneil. 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. Any advice appreciated. Stay home and grill your own steaks and stir your own martini. Typically 5 to 6 ounces of a/c oil is adequate but this may vary depending upon the car. 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. Use a strong surfactant like Simple Green or Zep Citrus, and soak the fins on the condensor. Stopleak is also risky. 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. The best replacement for R134a is R1234yf, while R12 refrigerant replacement was R134a. As noted, measure up front as best as you can to get as close to the aftermarket dim. 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. 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 It's helluva humid and hot here in north florida, and I drive around all day for my job. ). My turn to LOL - greasiesel! Failure to abide by the EPA regulations can result in expensive fines for either you or your service technician. 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. Can I order a valve based on the original eaton number? R134a compressors are substituted as new to retrofit the R12 system compressor part numbers with different height sealing washers. R134a and R12 are among the most popular types of refrigerants. -------------------------"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." 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. The flammables have hydrocarbons. 5) A/C System Failure. Hopefully after you have read this entire page you will have enough information to determine which type of refrigerant is best for you. Formula: (R12 Charge Specification x 0.9) - 0.25 lbs. Attach the R134a charge port adaptors, there are two types.. one of which you need to remove the old R12 valve cores. The best oil that runs well with R134a is PAG oil or Polyalkylene Glycol. Thanks again. There are two hoses listed, R-12 64-53-1-377-821 for $72.50, and R-134a 64-53-8-391-051 fro $262.50. I'm going to check the condensor is way clean too. The cable is adjustable at the valve arm. The larger line at the expansion valve is the suction line. The difference really shows up on the high side. However, it was found to be a very bad gas for the environment. Even though their common major function is to cool the system, they have many differences. -------------------------"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." And I already have so much time and money in this a/c project that I REFUSE to cut any corners as small as a TEV.It doesn't help that most people in the business (at least that I come in contact with, present company excluded, of course!) ESP when a compressor has frozen. Since then, the industry standard has been R134a, which is an efficient replacement. look at the difference! I think the way to go here is1. Swapping the components isnt a herculean task, but recharging the AC is a challenge. This leads me to labor over every small decision. Differences between R-12 and R-134a systems: 1. The sticker typically has a place to note the amount of refrigerant used, the type of oil and amount of oil, the technicians sign off or name and the date of the conversion. Next I'll jumper the aux fan. Even with proper fan operation, missing seals & air dams can effect condensor effeciency. Gnats & mosquitos will clog deep. Lets take you through the advantages, disadvantages, and differences of these two refrigerants a detailed comparison including R12 vs R134a performance. So, instead of using R12, other better options include R401b, R134a, R401a, etc.
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