Yes it will work with either Refrigerant! 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. Thus, when the system is running, condensing the CO2 is not a problem. 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. In a comparison between R12 vs R134a vs R1234yf, R1234yf will pass as the best refrigerant. leading to corrosion of expansion valves, capillary tube plugging, and compressor bearing . Gain access to our free AOP (Ask a Professional) Section to get real answers for your questions. 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. The aux fan seems to be working fine - it switches on occassionally. A discussion of the relationship between valve capacities and superheat set-tings can be found in Bulletin 10-9. Reattach the hose lines using new R134a compatible o-rings, lightly lubricate with compressor oil. 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. 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. This refers to BTU's (heat) moved per pound of refrigerant moved. Though I have seen em run as cold as 12 deg F. If the thermo switch is malfunctioning. If you have a York, and it is equipped with service valves, you can check & adjust the oil level without discharging the system. 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. The R134a compressor has a 1/8" step in on the high side port. 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. It is mixed with the freon for the most part, and does accumulate in all components in small amounts. american sniper longest shot; how to adjust sunsetter awning arms; pastor jeremy roberts texas. . 05-25-2017 02:14 AM. We sometimes use a relay switched from the compressor clutch to run fans. 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. The ozone depletion potential of a chemical is a factor that shows the level of degradation itll cause to the ozone layer that surrounds and secures the earth from harmful radiation. Why wait for 200f on the engine coolant to start the fan? 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. A lower GWP alternative to R-134a had to be found and thus we have the new 1234yf. Vent temperatures slowly go down to around 50F with hi speed driving. . Until 1995, most cars with air conditioning used R-12 Freon refrigerant which has shown to have an environmental impact. 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. ~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446. Unfortunately, the oil only mixes with the refrigerant as a liquid. 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. Yes, this was a smokers car. #19. Very nice! sparkee said: Thanks for the Service Bulletin. hardly noticable. R134a and R12 are both refrigerants used in vehicle air conditioning systems. Anyone know what happens when an R12 expansion valve is used in a system charged with R134A? 5. I'm curiousSo there is work to do, ie performance should be able to be improved. 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. _____ 2012 E350 2006 Callaway SC560 . R134a requires a different oil. ESP when a compressor has frozen. Do I leave the orignal condensor in, etc?Thanks. A/C systems designed to use R-12 will cool best when charged with R-12 refrigerant. 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. Bookmarks: Digg; del . I am ordering new parts, and planning to convert my system to R-134a. of refrigerant insulation tape. It is made up of carbon, hydrogen, and fluorine. On the other hand, R12 has a global warming potential of 10,910. Bad Car A/C Expansion Valve Symptoms. The problem with these so called drop in replacements is that to properly handle them you may need dedicated equipment to identify the gas and evacuate it for proper disposal. It is made up of carbon, hydrogen, and fluorine. 5. They have no moving parts. I'll report back on the aux fan on performance next. Be sure to test @ 1500 to 2000 engine rpm, and record the ambient temp as well. 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 first vehicle that used the R1234yf refrigerant was the 2013 Cadillac XTS. Therefore, its most suitable for both commercial and domestic environments. With the knowledge of the differences, youll be able to draw a comparison between R12 vs R134a efficiency. Besides, you have a greaseisel. 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. A capacity curve is shown in figure 2 for relative capacity of R134a vs. R12 for evaporating temperatures from 0F to 50F. Thanks again. (The .133 is the 300D Turbo).So, what does your compressor look like?B. gital control scheme. There is a lot of differences between the R12 and the R134a fittings, you can't mistake them. In cases such as this, the required capacity value of the expansion valve with R134a is reduced by 30% (correction factor 1.42). difference between r12 and r134a expansion valve. If not, you just don't know unless a test is performed. Not going to mess up your 'do, but you can feel it. So I probably put the highest suggested amount in to be safe. Right now you know you have a bit too much, but with a CR4P compressor this is an insurance policy. It was later found that R-134a had a very high Global Warming Potential, or GWP, number. When you add fluorescent tracer dye to with the refrigerant oil it helps to track down leaks that push oil out of the system. B. But R22 is almost equally damaging. And by matching the correct amount of R134a to use in a given vehicle, correcting the superheat of the expansion valve (if necessary), you can in some manner nearly balance or match the amount of heat drawn out by the evaporator and released by the condenser. Typically 5 to 6 ounces of a/c oil is adequate but this may vary depending upon the car. Then again, there are two different expansion valves. 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. It is made up of carbon, hydrogen, and fluorine. Can I use the one for the R-12? Neuro spine Super Speciality Clinic - Above Apollo Pharmacy, Bangarpet Circle, Kolar - Bangarpet Road, Kolar Town. Get to the point where I can walk without crutches2. ). 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. Sense ells no existirem. This leads me to labor over every small decision. (On firewall where A/C lines go into cab.) 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. What is needed? Usually, mechanics charge around $200 for conversion. Environmental Impact: When R134a escapes into the atmosphere, it contributes to global warming. A thermostatic expansion valve (TXV) (see Figure 1) is a refrigeration and air conditioning throttling device that controls the amount of refrigerant liquid injected into a system's evaporatorbased on the evaporator outlet temperature and pressurecalled the superheat. A/C Expansion Valve Replacement Cost. Even with proper fan operation, missing seals & air dams can effect condensor effeciency. ~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446. If there is no pusher fan, and you have the room, put one in. A comparison between R12 vs. R134a temperature will show that R12 has a higher temperature than R134a. BTW, I use a stick thermo in the vents and the laser on the condenser. ~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446. It may take a couple of tries to get things really clean.The laser is usually close on clean surfaces, but I prefer a T/C. I don't think it has any air dams or seals, I'll check to make sure. Best for varieties of operating conditions: Its boiling point is -21.6 Celsius. 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. 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. This allows the refrigerant in the condenser to be void of oil particles. Condensers designed to release greater amounts of heat help to expel the greater amount of heat which R134a removes from the cars interior. You'll want the expansion valve matched to whatever refrigerant you're using. System has been working fine for a year. R-401b is the mixture by weight of 61% R22, 11% R-152a and 28% of R-124. Some cars have both an engine coolant temp switch & a refrigerant temp switch, others only the refrigerant switch. difference between r12 and r134a expansion valve. 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. Paul -------------------------1983 Mercedes 240D on R12 and WVO!1192 Mercedes 300D 2.5 R134a1993 Toyota Pickup converted to R134a. 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. -------------------------Just another brick in the wallHad a little mule I fed him castor oil and every time he jumped the fence he fertilized the soil, The older expansion valves were filled with the refrigerant they were used with, the replacement valves (today) are filled with a different chemical to work with both refrigerants..Hope this helps-------------------------ChickEmail: Chick---------------------------------------------Freedoms just another word for nothing left to lose, I believe the optimum supercool setting will vary slightly between an expansion valve for an R12, as compared to R134a, system. PaulJerky King -------------------------1983 Mercedes 240D on R12 and WVO!1192 Mercedes 300D 2.5 R134a1993 Toyota Pickup converted to R134a. 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. Can I just use an adapter and save $200? According to Wikipedia, There is such a thing as "r132a" (1,1-Dichloro-2,2-Difluoroethane), however there is no indication of it being a commercially produced refrigerant. This is a great space to write long text about your company and your services. The symbol implies that R12 is a composite of carbon, chlorine, and fluorine. The reason is that the vehicles, for instance, manufactured currently configure the engine for R1234yf refrigerant, making no provision for replacement. difference between r12 and r134a expansion valve why is miles raney not on homestead rescue June 21, 2022. manila mayor candidates 2022 We mention using ester type refrigerant oil. 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. Statisicaly your friend was lucky. . 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. Any ideas from the info above? As noted, measure up front as best as you can to get as close to the aftermarket dim. Consider using the newer valve, even with 134a stamped on the valve. All pre-97 XJs use systems with the same basic operating principle, although the parts do change a bit. 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. Flush with a garden hose - do not use a high pressure washer - you can bend the fins flat & damage the condensor.B. There are significant differences between R12, R134a, and R513A, which must be considered when handling, processing, applying, or retrofitting with these refrigerants. If you have the work done, be sure you find a true "A/C" shop that can make up lines. The system will be checked for gross leaks while under vacuum. Stability: RR12 doesnt disintegrate even under extreme operating conditions. Yes, I don't trust the heater valve either. But, if your old compressor has lock-up or if your current expansion valve is not functional it would wise to replace the expansion valve with a valve designed for R134a. Your average garage that works on a/c on the side probably would not have this. When I compare parts, 93 uses one part number and 94 has a different part number. Looks like a couple of things happening here1) 80's vintage Eurocars were not "meat lockers". = R134a Charge Level. I could easily be over at least 2 - 3 ounces over on the oil. Heres R12 vs. R134a pressure chart. The difference between R12 and r134a is the BTU carrying capability.
Easyguard Ec204 Manual, Articles D
Easyguard Ec204 Manual, Articles D