Statisicaly your friend was lucky. The MB chart shows 360 psi with R12 in some conditions. I'm having the same concern. Usually, mechanics charge around $200 for conversion. By using a black light the dye will glow in areas where oil leaks are visible. 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 . Can I use the one for the R-12? a 50f delta across the condensor is good, but I suspect that is an idle reading. and an evaporator core and expansion valve that are optimized for R134a . When you add fluorescent tracer dye to with the refrigerant oil it helps to track down leaks that push oil out of the system. Generally, the new amount is 75-85% of the quantity advised by the manufacturer. How an A/C Expansion Valve Works. Should I do the test again with the the aux fan jumpered? But as there's not a big difference, people say you can suffice with either. The name of the oil is Polyol Ester (POE). We, the Rxmechanic team, have presented a well-detailed comparison of R134a vs. R12. look at the difference! = R134a Charge Level. On the other hand, R12 has a global warming potential of 10,910. Can I just use an adapter and save $200? In most cases, the systems used have varied components, designs, and service ports. The crossover point is approximately at 64F. had writing on the side that said R134a. . A/C systems designed to use R-12 will cool best when charged with R-12 refrigerant. Is the information not applicable to the old Pantera system? Its chemical symbol is CCl2F2. Right now you know you have a bit too much, but with a CR4P compressor this is an insurance policy. Besides, its technology has been tested and trusted. . 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 . The only difference I can imagine would be the recharge connection. Just leave it alone for now. By after changing just about everything, he got what was termed, satisfactory cooling. The general practice of charging the system with 15% less refrigerant adds to the thermal deficiency of R134a. If there is no pusher fan, and you have the room, put one in. Its not that difficult but the procedures of evacuation, charging and testing should be done by a licensed a/c technician that is experienced with R134a and your particular car. The Main change in the system is the expansion valve. Since the hose is the stock hose, you cannot tell what refrigerant is inside. The general practice of charging the system with 15% less refrigerant adds to the thermal deficiency of R134a. From memory, I put in at least 8 ounces of oil, probably around 10 ounces in there. Besides R134a there are some other refrigerants that are approved to replace R12 and there is a long list of refrigerants that are not approved. R12 is simply too expensive for a 25+ year old A/C system. 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 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. Back in that era, my business associates drove those things, brand new, and maybe I should take my Cadillac instead, no they wouldn't be caught dead in a Caddy, people of our esteem should be driving an MB. 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. Make sure visiually that no large gaps exist that would allow the air to bypass the condensor on the way to the radiator.B. It is made up of carbon, hydrogen, and fluorine. Gnats & mosquitos will clog deep. -------------------------"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, unfortunately a small high side pressure gauge on a short hose. Expansion Valve. Before R12 was replaced with R134a in 1995, it was mostly used in trucks and cars. There are significant differences between R12, R134a, and R513A, which must be considered when handling, processing, applying, or retrofitting with these refrigerants. System has been working fine for a year. Your average garage that works on a/c on the side probably would not have this. 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. All fans must work at 100% of the OEM rating. To prevent refrigerant loss you should consider replacing your old hose lines with barrier type hose. You may have heard of a friend that did the job himself with borrowed equipment and 12 or 16 ounce cans of refrigerant. Your decision could be made based on economics, environmental concerns, or both. Electric fans do wear out. The non-flammables can have R22 type gas which is not compatible with most rubber hoses or they have gases that contribute to global warming. When the sensor detects the refrigerant leak the sniffers lights glow and the sniffer makes a noise. 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. The reason is that the vehicles, for instance, manufactured currently configure the engine for R1234yf refrigerant, making no provision for replacement. 5. Get to the point where I can walk without crutches2. I put one in my old daily driver '79 Chevy tank (r-12), and it really made a difference. George Bray on Wed August 31, 2005 5:03 PM I believe the optimum supercool setting will vary slightly between an expansion valve for an R12, as compared to R134a, system. -The amount of R-134a needed will typically be 80-90% of the R-12 charge. The pressure/temperature curves for R-1234yf and R-134a are very similar. Super heats are so close, it should not be a major concern.-------------------------The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government. I've straightened the fans I can and sprayed simple green on it, let it soak then hosed it down well. R134a requires the use of synthetic oil! Environmental Impact: When R134a escapes into the atmosphere, it contributes to global warming. 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. You can use the R134a retrofit capacity chart for this purpose. Once you have replaced the OEM condensor with a PF unit, you will need to make custom hoses to mate with your OEM system. Even with proper fan operation, missing seals & air dams can effect condensor effeciency. Comparatively, larger R134a molecules should take more space, and a smaller amount might be required. Boiling Point: R134a refrigerants boiling point is -26.3C (-15.34F). You can use this space to go into a little more detail about your company. I don't know where it is getting the switch off command, or why the vent temp drops steadily. Quick View. . Rxmechanic.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for website owners to earn advertising fees by advertising and linking to Amazon.com. Please enter a password for your user account. I don't think it has any air dams or seals, I'll check to make sure. Then I'll put the ball valve in on the coolant and test it and see what we have. We ALWAYS want to know the pressure readings! Just had knee surgery yesterday, so I"M not exactly hopping around too well. Could that be screwing up the systems performance?Anyway, when I installed the system, the new TXV (is that short for expansion valve?) 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. and feeds it through an expansion valve. Hence, the effect of R12 on global warming is up to 10,000 times higher than carbon dioxide. The common problem when converting from R12 to R134a is lack of knowledge or equipment. 1) Look Here at the available sizes of PF condensors.2) Go look at your vehicle's condensor & mounting. 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. I've done the FSM test and with 81F ambient, the vent should be 50F. Though - the valve for a 1991 says R12 on it, and for a 1994, it says R-134a. . It cycles on off in med (or low for that matter)Gotta tell ya. You do not however need to replace all the o-rings or seals for a simple conversion, it is simply a logical thing to do when and if the time comes to work or replace certain components because of age issues. I have a laser temp reader, and it says the temps going into the condensor are up to 160F - coming out it is always around 110 or so. For those of you who are considering what the cost is for R12 you can think of it this way: Dont go out to dinner this weekend. At this time you can still find R12, but, because it is no longer produced, availability is limited to current inventories and the price per pound is greater than R134a. Why wait for 200f on the engine coolant to start the fan? 2001-2023 Griffiths Technical Inc. All Rights Reserved. The smoking question & vent airflow indicate that the evaporator is fairly clean - and you are aware of the importance of that.The heater valve stops the flow, but there is always some conduction heating. Thread starter goldNSX; Start date 1 August 2009; Tagged . Even though their common major function is to cool the system, they have many differences. An orifice tube is just a fixed nozzle that pisses refrigerant into the evaporator without any sort of feedback. We've updated our forums!Click here to visit the new forum, Year: 1991Make: Jaguar Model: XJ6Engine Size: 4.0. You do not want to exceed the systems high side recommendations. CLUTCH CYCLING SWITCH. Post photos, respond to polls and access other special features. That is a good thing. It will work and there will be very little, in any difference in performance.As Chick stated, the difference is only the gas used in the sensor tube. R12 systems used mineral oil, but unfortunately mineral oil doesn't dissolve in R134a. I don't want to be chasing ghosts. Well, I'm not sure it is 'fine' - it doesn't cool very well in 95F weather. Compared with the cost-performance ratio, R507 is 30-40% . And yes - expansion valves sometimes need replacing if they are sticky - but a proper AC flush should eliminate the need for a new one if it's already in good condition. If you you dont have the free time to play then you are better off to pay a technician. R134a. Theres no doubt that R12 refrigerant is one of the first compounds manufactured for the air conditioning and refrigeration world, but it had to be banned. The difference really shows up on the high side. Unfortunately, the oil only mixes with the refrigerant as a liquid. Operating Pressure/Temperature Differences The pressure/temperature curves for R-1234yf and R-134a are very similar. Most of all the differences gravitate to longevity, functionality, and safety. 30 deg is pretty coldSystems generally run between 40 and 43 deg. This kit comes complete with Expansion valve, o-ring kit, and 1ft. We sometimes use a relay switched from the compressor clutch to run fans. Not osmosis, but you know what I mean). R12 contains a chemical called chlorine that destroys the ozone layer, thereby causing potential environmental risk. The difference between the two is about 10,000 btu/h. Is there a difference between a R134a expansion valve and an R12 TXV? Low refrigerating effect per pound: In comparison to other refrigerants, the refrigerating effect of R12 per pound is low. How about evacing 1 pound of refrig from the system, and then putting 1 lb of pure R12 back in? Depending on which circuit diagram fits your car (cough, no vin list exists) you have either one or two switches controlling the aux fan. R12 and R134 are of different chemistry. The original CFC expansion valve used for R12 needs to be replaced with an HFC one for 134a to feed the evaporator correctly. In short, NO! 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 CONCLUSIONS The differences in the theoretical C.O.P.H calculated for R12 and R134a are consistent with values quoted in the literature. The evap is hard to get at. 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. Spray it deep, and let it sit for a few minutes. R-12 is no longer used or produced in many countries and remaining quantities have skyrocketed in price. R404a for freezing of product. american sniper longest shot; how to adjust sunsetter awning arms; pastor jeremy roberts texas. ~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446. 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. Agram a retevis rt22 password i bastrop county district clerk records el material que oferim als nostres webs. difference between r12 and r134a expansion valvewarning signs for a deteriorating patient with covid 19 infection 2022.07.03 18:36 18:36 Pray I can let some oil out of the compressor without losing my precious R12. What effect would it have on performance, if any? Very interesting! June 21, 2022 difference between r12 and r134a expansion valve . What is a T/C?4. Questions About Becoming A Professional Member? El juny de 2017, el mateix grup va decidir crear un web deDoctor Who amb el mateix objectiu. 4) Inconsistent Airflow. Blows pretty hard on full. Whether R134a performs as well as R12 in any given a/c system depends upon system components and the amount of R134a used. Anyone know what happens when an R12 expansion valve is used in a system charged with R134A? Not going to mess up your 'do, but you can feel it. As for R134a and R1234yf, theres no room for conversion. $21 . 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. Even if the system leaks, repairing the leaks and recharging it with R-12 is usually the best repair alternative. 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. Trinary Pressure Switch quantity. Most importantly, the oil used in the plant must always be compatible with the refrigerant used. Therefore, the higher the factor of the chemical (compound), the greater its effect on global warming. I'm doing one thing at a time so I know what the cause was. But I don't want to waste your time. Osuagwu Solomon is a certified mechanic with over a decade of experience in the mechanic garage, and he has over five years of experience in the writing industry. An extra half ounce? leading to corrosion of expansion valves, capillary tube plugging, and compressor bearing . 37 in 2005 tacoma, R134A. All fans must work at 100% of the OEM rating. Superheat you can consider to be the additional amount of heat. 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. The oil is spread all over your system when it is at rest. 4.3 out of 5 stars 491. It slowly gets warmer and warmer in the car, even at highway speeds. Flush with a garden hose - do not use a high pressure washer - you can bend the fins flat & damage the condensor.B. #19. You can also check the Aux fan in your case. Neuro spine Super Speciality Clinic - Above Apollo Pharmacy, Bangarpet Circle, Kolar - Bangarpet Road, Kolar Town. Reattach the hose lines using new R134a compatible o-rings, lightly lubricate with compressor oil. The next piece of equipment to track down leaks is a leak sniffer. R134a is otherwise called 1,1,1,2 Tetrafluoroethane, Florasol 134a, Freon 134a, Norflurane (INN) or HFC 134a. Paul:It is never a waste of my time to chat with someone that understands the problem, and wants to fix it. 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. Replacement expansion valve for R134a or R12 A/C refrigerants, with O-ring connections. ~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446. Large temperature difference between expansion valve inlet and outlet oReplace expansion valve Air . You should keep in mind that recharging your air conditioner improperly could result in more serious damage. This works when the R12 charge specification is listed in pounds. 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. A. Pressure/temperature table for R12, R134a, and R513A is shown in Figure 1. . He used thermostatic expansion valve and Capillary tube for analysis with R12.

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