difference between r12 and r134a expansion valve difference between r12 and r134a expansion valve

Edited: Sat July 14, 2007 at 10:22 PM by fonebone. 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. With R12 you use to check to see if the site glass was full, if it had bubbles it meant you had a low charge. difference between r12 and r134a expansion valve. I think the way to go here is1. The difference between R12 and r134a is the BTU carrying capability. Related products. So, instead of using R12, other better options include R401b, R134a, R401a, etc. Is that reasonable?Vent airflow is good, I think. Environmental Impact: When R134a escapes into the atmosphere, it contributes to global warming. The global warming potential of R134a is 1430. Below are the major differences between R134a and R12: The chemical composition of R12 and R134a differ. 37 in 2005 tacoma, R134A. Is there a difference between a R134a expansion valve and an R12 TXV? difference between r12 and r134a expansion valve You'll want the expansion valve matched to whatever refrigerant you're using. It can be used applications like walk-in coolers, food and dairy display cases, domestic refrigerators, and beverage dispensers and vending machines. To bless the system the technician should attach a R134a sticker somewhere in the engine compartment to note the car is using R134a. Still, I have some simple green, so may as well give it a go. So if the TXV is OK, and the too much oil situation is not a big problem, then I wonder why the compressor is switching off after about 15 minutes of cooling? About four or five years ago, I guy with an MB came here with the same problem, that tread was over six pages long. A York oil capacity is listed as "6.5 to 9.6 ounces". = R134a Charge Level. Safety: R134a is safe to use as its non-flammable and cant explode. In 1994 they switched from R-12 to R-134a. When the temperature is reduced to-7C or below, the plants ability to cool the airdrops significantly. 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. in /nfs/c05/h04/mnt/113983/domains/toragrafix.com/html/wp-content . R134a requires the use of synthetic oil! Its chemical symbol is CCl2F2. We've updated our forums!Click here to visit the new forum, Year: 1991Make: Jaguar Model: XJ6Engine Size: 4.0. video clubhouse baseball; nick fairley draft profile; ben davis work pants R134a refrigerant is lighter than R12. Most of all the differences gravitate to longevity, functionality, and safety. 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. First, differences in physical properties: 1, insoluble R12 compressor oil is used (to reduce the lubricant) 2, dissolved sealing materials are used (resulting in refrigerant leakage) 3, easy to damp (so easy to internal . Interestingly, theres one oil type that works perfectly with both types of refrigerants. I recommend replacing the expansion valve when you do the swap. In sum, R12 has done more bad than good. Once you have replaced the OEM condensor with a PF unit, you will need to make custom hoses to mate with your OEM system. compressor, condenser, evaporator and expansion valve are specifically designed for use with R134a. How to Convert R12 to R22 | eHow CONCLUSIONS The differences in the theoretical C.O.P.H calculated for R12 and R134a are consistent with values quoted in the literature. -------------------------1983 Mercedes 240D on R12 and WVO!1192 Mercedes 300D 2.5 R134a1993 Toyota Pickup converted to R134a, Hi pdrayton- If you can remember the oil capacity that you found in all your research and post that, then bohica and others can have a better idea if you have too much; see if you can find that info! R134a requires a different oil. In a comparison between R12 vs R134a vs R1234yf, R1234yf will pass as the best refrigerant. Hence, the effect of R12 on global warming is up to 10,000 times higher than carbon dioxide. With tube & fin condensors in MVAC applications there is never "too much" airflow. Use a drop light in the engine bay, and check the air path from the front of the car at night. The higher the ambient temperature the higher the high side pressure. So you could likely put off buying those new hoses just a bit longer if you wanted. 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. But some types of PAG do not mix well with the old residual R12 mineral oil left in the system components whereas ester does mix very well. The system has been previously converted to R-134a. Next I'll jumper the aux fan. 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. 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. Its chemical symbol is CH2FCF3. Temp switch works the aux fan. And I lied about the compressor switches on this car - there are 2 switches on the drier - a temp and a pressure switch. The MB chart shows 360 psi with R12 in some conditions. Best for varieties of operating conditions: Its boiling point is -21.6 Celsius. On this website we are addressing only R134a and not other suggested drop in replacements. Here are the basics for converting a system that does not have a charge of R12, its empty. difference between r12 and r134a expansion valve The cost of recharging the air conditioner is between $150 to $500. This is not to say that one of these small retro-fit kits cant be used, however to be used wisely. The larger line at the expansion valve is the suction line. We recently created this blog site to enable us to share our knowledge with other automotive mechanics and car owners. 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. If you have the work done, be sure you find a true "A/C" shop that can make up lines. -------------------------1983 Mercedes 240D on R12 and WVO!1192 Mercedes 300D 2.5 R134a1993 Toyota Pickup converted to R134a. I'll report back on the aux fan on performance next. That is for the compressor, drier, expansion valve and condenser. 1) Look Here at the available sizes of PF condensors.2) Go look at your vehicle's condensor & mounting. Even though their common major function is to cool the system, they have many differences. R134a refrigerant fittings are different size. But I don't want to waste your time. ThanksPaul -------------------------1983 Mercedes 240D on R12 and WVO!1192 Mercedes 300D 2.5 R134a1993 Toyota Pickup converted to R134a. So I probably put the highest suggested amount in to be safe. However, theyre still used in older plants, systems, and the automotive industry. Hmmmm. 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. It won't be optimal, though. 2001-2023 Griffiths Technical Inc. All Rights Reserved. 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. In addition, R134a refrigerants are not only used in auto air conditioners, they can be used in freezers, aerosol cans, and refrigerators. With the knowledge of the differences, youll be able to draw a comparison between R12 vs R134a efficiency. This is an electronic tool that sucks in air through a tube and across a sensor. A slow loss of cooling at city speeds is usually related to condensor capacity & airflow issues. But as there's not a big difference, people say you can suffice with either. The only difference I can imagine would be the recharge connection. The R134a compressor has a 1/8" step in on the high side port. Very nice! A slow loss of cooling at city speeds is usually related to condensor capacity & airflow issues.You could improve the cooling capacity by replacing the condensor with a high effeciency parallel flow unit. You can buy bulk hose, and the proper fittings, then have them crimped off the vehicle.Be sure that no air bypasses the new condensor on the way to the radiator. The ARPA Zone/Open Membership Discussion Forums. Neuro spine Super Speciality Clinic - Above Apollo Pharmacy, Bangarpet Circle, Kolar - Bangarpet Road, Kolar Town. R134a compressors are substituted as new to retrofit the R12 system compressor part numbers with different height sealing washers. R12 is simply too expensive for a 25+ year old A/C system. bokoen1 hoi4 the great purge / meryl and maks dancing with the stars / difference between r12 and r134a expansion valve. R12, on the other hand, has an ozone depletion potential of 1, implying that it can damage the ozone layer. 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. R12, on the other hand, is called chlorofluorocarbon (CFC). Welcome to rxmechanic.com. 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. Since then, the industry standard has been R134a, which is an efficient replacement. Where would I get some basic info on it, I know nothing about it. R134a has the chemical formula CF3CH2F and is known as tetrafluoroethane. 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). Are r12 and r134 fittings different? 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. 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. Expansion Valve. This is because R134a. If you're getting a R134a compressor, might as well finish the job - replace the receiver/dryer, flush everything else, and convert to R134a anyhow. There are significant differences between R12, R134a, and R513A, which must be considered when handling, processing, applying, or retrofitting with these refrigerants. How is 1234yf different from . Read on for more information about using automotive r134a in a refrigerator and vice versa. Miscibility with oil: R12 can be mixed with the compressor oil no matter the operating condition. We sometimes use a relay switched from the compressor clutch to run fans. maintain the A/C of older cars. The OEM spec is 2300 rpm @ 12.6v (engine stopped fully charged battery). The difference between R12 and R134a TEV (exp valves) is primarily the 'superheat'. I've done the FSM test and with 81F ambient, the vent should be 50F. 05-25-2017 02:14 AM. R134a is called tetrafluoroethane (HFC). 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. 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. Later model cars that come with 134A will have 134A only connectors. Catalog E-1, Thermostatic & Automatic Expansion Valves / Page 1 Table of Contents . Concentration level: The R134a vapor dilutes the oxygen concentration in the air to a low level, thereby causing harm. R134a is the most widely accepted alternative automotive refrigerant used to replace R12. If you find any of these conditions you will want to liquid flush (with dedicated AC flush solution) all the lines, condensers, evaporator (remove the expansion valve) before you proceed further. american sniper longest shot; how to adjust sunsetter awning arms; pastor jeremy roberts texas. . 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. There are R134a specific valves that operate at a slightly different pressure, but not for any "old" automotive application that I'm aware of. Its chemical symbol is CH2FCF3. The major reason for the replacement of R12 with R134a was to curb future greenhouse effects. 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. Recovery & flushing is the only way out of an oil overcharge in your vehicle.B. But, what is considered a good temperature differential across the condensor? R134a has a smaller molecule than R12 so R134a will leak out sooner than R12. Pound for pound R134a is a more efficient refrigerant than R12, however it runs at higher pressures in some aspects and therefore requires more effective condensing. You will be fine with a 134a-compatible TXV running R12. R134a and water have the same abilities to change the state but R134a can do this more rapidly and at a much lower temperature than water. Answer: OK, I'll bite. ambulance tailgate conversion R134a Expansion valve different from R12? - Automotive Air Conditioning 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. Even with proper fan operation, missing seals & air dams can effect condensor effeciency. Reattach the hose lines using new R134a compatible o-rings, lightly lubricate with compressor oil. An orifice tube is just a fixed nozzle that pisses refrigerant into the evaporator without any sort of feedback. The cure is to use the newer R134a compressors is sealing washers that are different thickness. It would make a big difference at idle ,in traffic!! B. It is made up of carbon, hydrogen, and fluorine. leading to corrosion of expansion valves, capillary tube plugging, and compressor bearing . Warning: "continue" targeting switch is equivalent to "break".Did you mean to use "continue 2"? But, if your car lacks enough condenser and you have many 100+ degree days then you may want to stick either increase air flow, add another condenser as we mentioned in The Mr. Ice Project or stick with R12. R12 contains a chemical called chlorine that destroys the ozone layer, thereby causing potential environmental risk. This is 11F off the FSM performance graph - vent should be around 50F. The original CFC expansion valve used for R12 needs to be replaced with an HFC one for 134a to feed the evaporator correctly. A/C receiver difference between R12 and R134a? | NSX Prime 5. If your car does not have a high pressure cut-out switch in the AC system then youll need to have one installed (call us if you need help).