CR4P). 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. Thanks again. I'm not sure. Whenever its exposed to the environment, it changes to a gas. Reattach the hose lines using new R134a compatible o-rings, lightly lubricate with compressor oil. We've updated our forums!Click here to visit the new forum, Year: 1991Make: Jaguar Model: XJ6Engine Size: 4.0. The system will be checked for gross leaks while under vacuum. I had a 1991 BMW switched to 134a by just changing the low pressure charging valve, flushing and refilling with 134 (maybe with 10% . Agram a retevis rt22 password i bastrop county district clerk records el material que oferim als nostres webs. The primary function of the design engineer is to make things difficult for the fabricator and impossible for the serviceman. 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. The next piece of equipment to track down leaks is a leak sniffer. We mention using ester type refrigerant oil. El maig de 2016, un grup damics van crear un lloc web deOne Piece amb lobjectiu doferir la srie doblada en catal de forma gratuta i crear una comunitat que inclogus informaci, notcies i ms. 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. "Jerky Locker" LMAO I am using that one in the future!Florida = BUGS! As R134A refrigerant has different operating characteristics and pressures this valve is not necesssry. What is a T/C?4. Just leave it alone for now. Formula: (R12 Charge Specification x 0.9) - 0.25 lbs. The analysis focuses on Coefficient of Performance for . Most vehicles manufactured before 1993 have the R12 A/C system. ~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446. If he is not in the garage fixing challenging mechanical problems, he is writing automotive repair guides, buyers guides, and car and tools comparisons. 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. You are indeed 20% out of the OEM spec for cooling. By using a black light the dye will glow in areas where oil leaks are visible. Safe but sorry! The Main change in the system is the expansion valve. of coiled cap tube on VCR system with R134a. This would be a custom install, there is no "drop-in" condensor upgrade for that car.Check for proper fan operation, and clean the air path on both the condensor & radiator. I had to vaccum the system for 2 hours and recharge 4 oz of PAG oil plus 36 oz of 134A freon (3 cans). Before R12 was replaced with R134a in 1995, it was mostly used in trucks and cars. The expansion valve is designed so that the temperature of the refrigerant at the evaporator outlet must have 8 to 12F (4 to 7C) of superheat before more refrigerant is allowed to enter the evaporator. There is a lot of differences between the R12 and the R134a fittings, you can't mistake them. Is there a difference between a R134a expansion valve and an R12 TXV? Large temperature difference between expansion valve inlet and outlet oReplace expansion valve Air . Bookmarks: Digg; del . R12, on the other hand, has an ozone depletion potential of 1, implying that it can damage the ozone layer. Mine was 61, so the system is not working as it is supposed to. Stopleak is also risky. Replied by Rich928 on topic R12 or R134a. All fans must work at 100% of the OEM rating. It cycles on off in med (or low for that matter)Gotta tell ya. For R12, its mineral oil. Just had knee surgery yesterday, so I"M not exactly hopping around too well. R134a systems operate at higher discharge-side pressures than R12, which can cause compressor seals to leak. Can I use the one for the R-12? With R-12, 30 is 28.4psi and 40 is 36.9psi, for a difference of 8.5psi. A York oil capacity is listed as "6.5 to 9.6 ounces". Put a relay on the compressor clutch to the aux fan (I like that idea - makes a lot of sense)How does that sound? The best oil that runs well with R134a is PAG oil or Polyalkylene Glycol. Please enter a password for your user account. Hmmmm. Any suggestions, or do you need to know the hi/lo readings? It was later found that R-134a had a very high Global Warming Potential, or GWP, number. 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. R134a refrigerant is lighter than R12. But, what is considered a good temperature differential across the condensor? The cure is to use the newer R134a compressors is sealing washers that are different thickness. 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. If you have a York, and it is equipped with service valves, you can check & adjust the oil level without discharging the system. Can I order a valve based on the original eaton number? At 2000rpm, windows open, highest fan, hi pressure stabilized at 225 psi, low 25psi.Ambient 81F, vent 61F. Trinary Pressure Switch $ 39.99. The exact amount will vary with each car. of refrigerant insulation tape. Does it matter - assuming both are new & uncontaminated? R12, on the other hand, is called chlorofluorocarbon (CFC). After the system has been tested out it should be checked for leaks. It is usually sold under the brand name, Freon 12. As per their results . The MB chart shows 360 psi with R12 in some conditions. Also the new quick connect fittings for the high & low side. These efforts to balance the system can not be realized if there are problems within the a/c system, such as: poor performing compressor, dirty condenser or poor air flow through the condenser, malfunctioning expansion valve, water or air in the system, improperly operating fresh air or heat input in the climate-air mixing system. We chose to use 5-6 ounces of oil to be on the safe side: 3-4 ounces for the compressor, 1 oz of oil for the drier and another ounce of oil for system losses. This drop can affect energy consumption since the plant will operate for a longer period or a larger plant will have to be installed. ). Gnats & mosquitos will clog deep. That way I will have reduced the oil by about 1/3 (assuming the oil is mixed evenly through the system). 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. Edited: Tue July 17, 2007 at 3:25 AM by bohica2xo, I believe there is only one switch - the refrigerant switch. 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 . 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. It can be used applications like walk-in coolers, food and dairy display cases, domestic refrigerators, and beverage dispensers and vending machines. 5. If not, you just don't know unless a test is performed. It is possible I have 10 ounces (250 ml) in the system. B. To ensure the right charge, you must fill the new system with between 75 and 85% of the factory-set capacity for optimal cooling. All fans must work at 100% of the OEM rating. Thus, when the system is running, condensing the CO2 is not a problem. Paul:It is never a waste of my time to chat with someone that understands the problem, and wants to fix it. R12 systems used mineral oil, but unfortunately mineral oil doesn't dissolve in R134a. Welcome to rxmechanic.com. 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. leading to corrosion of expansion valves, capillary tube plugging, and compressor bearing . You can use this space to go into a little more detail about your company. So to keep things simple and to avoid controversy and politics we have R134a. Moreso, it had been banned. 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. 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. Plus, not releasing the chemical into the air is morally justifiable. difference between r12 and r134a expansion valve. This is a great space to write long text about your company and your services. I'll report back on the aux fan on performance next. At the time I thought nothing of it, but now I am thinking maybe that is contributing to the system not working as well as it could. Automotive Replacement Expansion Valves & Parts; Industrial & Scientific; Customer Reviews. But as there's not a big difference, people say you can suffice with either. The flammables have hydrocarbons. The name of the oil is Polyol Ester (POE). american sniper longest shot; how to adjust sunsetter awning arms; pastor jeremy roberts texas. 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!) 05-25-2017 02:14 AM. The bad thing is I don't know what to do about it. Swapping the components isnt a herculean task, but recharging the AC is a challenge. Tamb oferim en VOSC el contingut daquestes sries que no es troba doblat, com les temporades deDoctor Who de la 7 en endavant,les OVA i els especials de One Piece i molt ms. A. Pressure/temperature table for R12, R134a, and R513A is shown in Figure 1. . Some say that a chemical reaction can harm the A/C very badly as R134a reacts with mineral oil in some way. Heres some important advice Whenever you notice your R12 refrigerant is leaking, turn off all flames and open the doors so it can escape to the open atmosphere. Thomas Jefferson, Thanks,OK, I'm starting to feel a little better about it. Depending on which circuit diagram fits your car (cough, no vin list exists) you have either one or two switches controlling the aux fan. Look at where the lines will end up. 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. In a comparison between R12 vs R134a vs R1234yf, R1234yf will pass as the best refrigerant. Formula: (R12 Charge Specification x 0.9) - 0.25 lbs. Look deep into the fins. It is made up of carbon, hydrogen, and fluorine. The approval is very legal one, governed by the U.S. EPA. 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. So that indicates it is cooling well there doesn't it? About four or five years ago, I guy with an MB came here with the same problem, that tread was over six pages long. difference between r12 and r134a expansion valve. Is that reasonable?Vent airflow is good, I think. There are three different refrigerants officially sanctioned by the EPA for automotive usage: r-12, r-. 3) A TXV optimized for 134a will be ok with R12. Read on for more information about using automotive r134a in a refrigerator and vice versa. It didn't seem too dirty though - I don't think it is the problem, but I could be wrong. Inasmuch as R134a has a global warming potential thats over 1000 times more threatening than carbon dioxide, its better than R12. Can I just use an adapter and save $200? 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. Is the information not applicable to the old Pantera system? Stay home and grill your own steaks and stir your own martini. Neuro spine Super Speciality Clinic - Above Apollo Pharmacy, Bangarpet Circle, Kolar - Bangarpet Road, Kolar Town. The original expansion valves work very well with R134a. By noting the ambient temperature you can look up what the preferred high side pressure should be. When the temperature is reduced to-7C or below, the plants ability to cool the airdrops significantly. It would make a big difference at idle ,in traffic!! I could easily be over at least 2 - 3 ounces over on the oil. 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). Are r12 and r134 fittings different? You do not want to exceed the systems high side recommendations. It is perhaps possible to locate a unit with a company that purchases close out or distressed merchandise. I would not do a 134a conversion without a PF condensor. 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. 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. 2001-2023 Griffiths Technical Inc. All Rights Reserved. Comparatively, larger R134a molecules should take more space, and a smaller amount might be required. You may have heard of a friend that did the job himself with borrowed equipment and 12 or 16 ounce cans of refrigerant. Whether R134a performs as well as R12 in any given a/c system depends upon system components and the amount of R134a used. . "Howdy, Folks!" I've done the FSM test and with 81F ambient, the vent should be 50F. Can I just use an adapter and save $200? 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. As for R134a and R1234yf, theres no room for conversion. Your old hoses of course will not fit. 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. 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. They should be able to keep you comfortable on a long trip, but don't expect vent frost in 3 minutes or lesss.2) Too much oil can reduce cooling capacity, and the effect is not linear. Flush with a garden hose - do not use a high pressure washer - you can bend the fins flat & damage the condensor.B. #13. If you have the work done, be sure you find a true "A/C" shop that can make up lines. Its among the greenhouse gases and will keep adding the current problem of heat not leaving the earths atmosphere. This leads me to labor over every small decision.