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. What is a T/C?4. This drop can affect energy consumption since the plant will operate for a longer period or a larger plant will have to be installed. Gain access to our free AOP (Ask a Professional) Section to get real answers for your questions. This is the part that controls the system pressures. I cleaned the evap as best I could, if that is what you are getting at. If the charge is low the compressor will cycle on/off in the max AC position. Right now you know you have a bit too much, but with a CR4P compressor this is an insurance policy. Kommentare . As an example, let's say the R12 charge specification is listed at 2 lbs. 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. Biggest you can fit in there is best. The butylcellusolve or the citrus solvent will dissolve the carcass in a few minutes. R12 was once used in many air conditioning units as a refrigerant or cooling agent. 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. It's helluva humid and hot here in north florida, and I drive around all day for my job. Blows pretty hard on full. And I lied about the compressor switches on this car - there are 2 switches on the drier - a temp and a pressure switch. The money you will save by will pay for the R12. For R12, its mineral oil. There is only a temperature switch on these cars as far as I recall, and it just switches on the aux fan. Existing technology: R134a has been in use in the refrigeration industry for very many years, and theres so much information about the safe use of the product. If not, you just don't know unless a test is performed. However, the supply houses don't indicate a difference. Well, I'm not sure it is 'fine' - it doesn't cool very well in 95F weather. This allows the refrigerant in the condenser to be void of oil particles. I'm having the same concern. maintain the A/C of older cars. 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. It's not just the poor performance - the cooling just stops working after a while. Moreso, it had been banned. It is perhaps possible to locate a unit with a company that purchases close out or distressed merchandise. I have some experience with auto a/c but not too much. Thomas Jefferson, Thanks,OK, I'm starting to feel a little better about it. In cases such as this, the required capacity value of the expansion valve with R134a is reduced by 30% (correction factor 1.42). I'm doing one thing at a time so I know what the cause was. Most vehicles manufactured before 1993 have the R12 A/C system. The global warming potential measures the amount of heat trapped by any gas compared to the amount of heat trapped by the same amount of carbon dioxide. As noted, measure up front as best as you can to get as close to the aftermarket dim. And no, you cannot "drain' excess oil out. For instance at 25 F the pressure of R-12 is 24.6 PSI and the pressure of R-134a is 22.1 PSI. It is made up of carbon, hydrogen, and fluorine. Boiling Point: R134a refrigerants boiling point is -26.3C (-15.34F). Its chemical symbol is CCl2F2. Next I'll jumper the aux fan. In 1994 they switched from R-12 to R-134a. But I don't want to waste your time. Depending on which circuit diagram fits your car (cough, no vin list exists) you have either one or two switches controlling the aux fan. Warning: "continue" targeting switch is equivalent to "break".Did you mean to use "continue 2"? As per their results . Vent temperatures slowly go down to around 50F with hi speed driving. Energy usage: R134a is less efficient in cooling compared to R12. link to How to cut off a Catalytic Converter. However, it was found to be a very bad gas for the environment. This kit comes complete with Expansion valve, o-ring kit, and 1ft. Just leave it alone for now. A/C receiver difference between R12 and R134a? Yes it will work with either Refrigerant! Yep, definately not a meat locker. 5) A/C System Failure. After the optimum refrigerant charge is determined the car should be test driven to check for performance of the system. What was the ambient when you took that reading?Jumpering the aux fan is a common thing here in the desert. I would not do a 134a conversion without a PF condensor. June 21, 2022 difference between r12 and r134a expansion valve . The value of carbon dioxide is 1. 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. Generally this works well for the whole system. A capacity curve is shown in figure 2 for relative capacity of R134a vs. R12 for evaporating temperatures from 0F to 50F. To ensure the right charge, you must fill the new system with between 75 and 85% of the factory-set capacity for optimal cooling. "Jerky Locker" LMAO I am using that one in the future!Florida = BUGS! Very interesting! Your decision could be made based on economics, environmental concerns, or both. 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. Its cylinders are colored white. You will be fine with a 134a-compatible TXV running R12. Do a pre-inspection and then Evacuate (vacuum down) the system, the longer the evacuation the better but there is a point of diminishing return, 2-3 hours is generally very good. The approval is very legal one, governed by the U.S. EPA. In more serious, it could result in cardiac irregularities or death. 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. J.Harris said: Or if you want to do it like they do in Mexico you can use propane, it's an excellent refrigerant but highly flammable. Jun 17, 2011. in /nfs/c05/h04/mnt/113983/domains/toragrafix.com/html/wp-content . The OEM spec is 2300 rpm @ 12.6v (engine stopped fully charged battery). You are indeed 20% out of the OEM spec for cooling. What is a good differential? We say generally because the vehicle manufacturer may have a formula already worked out for the R134a conversion process. 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. R134a is called tetrafluoroethane (HFC). #19. Expansion valves are an active device, they regulate the flow of refrigerant to the evaporator depending on evaporator temperature. But as there's not a big difference, people say you can suffice with either. . Recharge the compressor with a/c ester oil and a tracer dye. In a comparison between R12 vs R134a vs R1234yf, R1234yf will pass as the best refrigerant. Paul:A 1983 240D should have a York compressor on an OEM system. When you add fluorescent tracer dye to with the refrigerant oil it helps to track down leaks that push oil out of the system. But R22 is almost equally damaging. 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. The common problem when converting from R12 to R134a is lack of knowledge or equipment. Gnats & mosquitos will clog deep. To bless the system the technician should attach a R134a sticker somewhere in the engine compartment to note the car is using R134a. That is for the compressor, drier, expansion valve and condenser. 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. Usually, mechanics charge around $200 for conversion. R134a refrigerant fittings are different size. R12 Expansion Valve = 201 830 06 84 R134A Expansion Valve = 201 830 04 84 Is there a difference after all? The original CFC expansion valve used for R12 needs to be replaced with an HFC one for 134a to feed the evaporator correctly. 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. 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. These differences in the valve size can be attributed to the correlation of the cooling capacity with the enthalpy difference and the mass flow, which in . This refers to BTU's (heat) moved per pound of refrigerant moved. Have a look in the FAQ Section, and look for "Fan clutches & testing them". Autor de l'entrada Per ; Data de l'entrada calexico west port of entry hours; 12 month libor rate 2021 a difference between r12 and r134a expansion valve a difference between r12 and r134a expansion valve If you still find it difficult to use R134a in a home AC system, you can check out a comparison of R12 vs R134a fittings to know the refrigerant that best fits the AC system. ~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446. It is made up of carbon, hydrogen, and fluorine. hardly noticable. The original rubber a/c hose lines in your car will leak out R12 through the hoses lining. Operating Pressure/Temperature Differences The pressure/temperature curves for R-1234yf and R-134a are very similar. 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. Thus, when the system is running, condensing the CO2 is not a problem. 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. Most importantly, the oil used in the plant must always be compatible with the refrigerant used. A good T/C, clamped to the line & insulated gives a repeatable measurement of the tube. 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. absorb by the evaporator to insure all liquid refrigerant entering the evaporator. Like say half a can or so recharge come springtime warm weather or something. 5. Compressor. Some cars have both an engine coolant temp switch & a refrigerant temp switch, others only the refrigerant switch. 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. R12, on the other hand, has an ozone depletion potential of 1, implying that it can damage the ozone layer. Participate in over 40 different forums and search/browse from nearly 3 million posts. Use strips of foam to couple the two heat exchangers if necessary.B. R12 is CFC: Even though R12 is one of the most commonly used refrigerants, it is CFC. It is usually sold under the brand name, Freon 12. . So you could likely put off buying those new hoses just a bit longer if you wanted. Compared with the cost-performance ratio, R507 is 30-40% . B. Mine was 61, so the system is not working as it is supposed to. 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. video clubhouse baseball; nick fairley draft profile; ben davis work pants Jun 19, 2007. Besides, R134a refrigerant was manufactured after R12 was banned to help reduce the harshness of the old chemical (R12) on the ozone layer. When the sensor detects the refrigerant leak the sniffers lights glow and the sniffer makes a noise. Comparatively, larger R134a molecules should take more space, and a smaller amount might be required. There are significant differences between R12, R134a, and R513A, which must be considered when handling, processing, applying, or retrofitting with these refrigerants. After the system has been tested out it should be checked for leaks. Get to the point where I can walk without crutches2. The condenser water inlet temperature and flow rate are controlled with the use of a . 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. R12 is used in several applications like low temperature, medium temperature, and high-temperature applications. Any ideas from the info above? The pressure at low temperatures is nearly the same between 12 and 134a. Inhalation of vapor: Inhaling a large amount of R134a vapor can lead to drowsiness, temporary nervous system depression, and lethargy.
Islands For Sale Under $100k,
Apellidos Mexicanos Elegantes,
1922 Liberty Silver Dollar Trust Misspelled Worth,
University Of Utah Pickleball,
Houses To Rent In Marsden South Shields,
Articles D
