ing the expansion valve, a maximum opening superheat of 7F, and a standard factory air test superheat setting. 10,000BTU conduction heating? asia pacific stevie awards 2021. gin, amaretto cocktail. Nice to use new gadgets! The cure is to use the newer R134a compressors is sealing washers that are different thickness. But R22 is almost equally damaging. 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. If you are replacing other system components, such as condensers, driers or hoses, you may need to add more a/c refrigerant oil to the system. So I probably put the highest suggested amount in to be safe. The exact amount will vary with each car. Unfortunately, the R12 refrigerant doesnt always blow cold air. With new R12 no longer being manufactured, the market price soared to $100/pound. How is 1234yf different from . -------------------------"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." I'm going to check the condensor is way clean too. 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. Tech Talk - Differences between R-1234yf and R-134a - FJC Inc Als nostres webs oferimOne Piece,Doctor Who,Torchwood, El Detectiu ConaniSlam Dunkdoblats en catal. Its chemical symbol is CH2FCF3. R-134a XV for R-134a use. It runs between the condenser outlet, receiver/drier unit and expansion valve at the firewall. Since 2010, all home AC systems manufactured use a refrigerant like R134a that has zero ozone depletion potential (ODP). Is that why expansion valves are specific to R12 or R134A? Sense ells no existirem. R134a and R12 are both refrigerants used in vehicle air conditioning systems. The original CFC expansion valve used for R12 needs to be replaced with an HFC one for 134a to feed the evaporator correctly. The compressors used by refrigeration plants to compress gas require oil to help lubricate its moving parts. The butylcellusolve or the citrus solvent will dissolve the carcass in a few minutes. However, theyre still used in older plants, systems, and the automotive industry. The cost of recharging the air conditioner is between $150 to $500. R134a and R12 are among the most popular types of refrigerants. 5) A/C System Failure. Flushed, vacuumed etc. CR4P). If liquid refrigerant were to exit the evaporator. It can be used applications like walk-in coolers, food and dairy display cases, domestic refrigerators, and beverage dispensers and vending machines. Warning: "continue" targeting switch is equivalent to "break".Did you mean to use "continue 2"? 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. I'm curiousSo there is work to do, ie performance should be able to be improved. Where would I get some basic info on it, I know nothing about it. It is also used in automotive car conditioning and the plastic industry. (The .133 is the 300D Turbo).So, what does your compressor look like?B. Its chemical symbol is CCl2F2. BTW, I use a stick thermo in the vents and the laser on the condenser. I'm putting r12 back in my system, but all of the valves I can for the application (1990 jeep grand wagoneer) say r134a on them. Different correction factors are applied to other refrigerants. It cycles on off in med (or low for that matter)Gotta tell ya. Make sure to get the R12 EXP valve if that is the way you go. 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. Like say half a can or so recharge come springtime warm weather or something. The larger line at the expansion valve is the suction line. I'll report back on the aux fan on performance next. Replied by Rich928 on topic R12 or R134a. Whenever its exposed to the environment, it changes to a gas. 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. R-12 is no longer used or produced in many countries and remaining quantities have skyrocketed in price. The common problem when converting from R12 to R134a is lack of knowledge or equipment. 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. R12 is simply too expensive for a 25+ year old A/C system. The aux fan seems to be working fine - it switches on occassionally. R12 is used in several applications like low temperature, medium temperature, and high-temperature applications. R12 is CFC: Even though R12 is one of the most commonly used refrigerants, it is CFC. Though you can purchase 12 or 16 ounce cans of R134a from local retailers it is very difficult to measure out the correct amount into your system. 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 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. The difference between R12 and R134a TEV (exp valves) is primarily the 'superheat'. Mine was 61, so the system is not working as it is supposed to. The experimental values of C.O.P.H obtained with the R134a/ester charge were 20.2% PDF Experimental analysis of Thermostatic expansion valve, Constant In practice this means that the car can overheat and the aux fan will stay off! Right now you know you have a bit too much, but with a CR4P compressor this is an insurance policy. They have no moving parts. Quick View. R134a was selected as a replacement refrigerant for R12 because R12 contains chlorine and has a major effect to ozone layer depletion. That is a good thing. But, what is considered a good temperature differential across the condensor? But as there's not a big difference, people say you can suffice with either. And, unfortunately a small high side pressure gauge on a short hose. If it splashes inside the eye, it could lead to a serious eye problem. We consider the the various types alternative refrigerants that are illegal or not approved to be in two sectors: non-flammables and flammables. Automotive Replacement Expansion Valves & Parts; Industrial & Scientific; Customer Reviews. Attach the R134a charge port adaptors, there are two types.. one of which you need to remove the old R12 valve cores. R12 to 134A conversion. | Allpar Forums The mechanical fan & clutch should be checked as well. (On firewall where A/C lines go into cab.) difference between r12 and r134a expansion valve I bought a relay to put on it connected to the compressor clutch. I had to vaccum the system for 2 hours and recharge 4 oz of PAG oil plus 36 oz of 134A freon (3 cans). The pressure at low temperatures is nearly the same between 12 and 134a. In most cases, the systems used have varied components, designs, and service ports. "Jerky Locker" LMAO I am using that one in the future!Florida = BUGS! In short, NO! Edited: Sat July 14, 2007 at 10:22 PM by fonebone. Then when it is switched off for a few minutes and then back on, the air cools again. Is there a graph? PDF Tecumseh Guidelines for Utilization of R134a If ambient is 90 (today) and the output of the condensor is 110, that's pretty good isn't it? This is 11F off the FSM performance graph - vent should be around 50F. 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. 4.3 out of 5 stars 491. Superheat you can consider to be the additional amount of heat. Miscibility with oil: R12 can be mixed with the compressor oil no matter the operating condition. difference between r12 and r134a expansion valve. R134a refrigerant is about 10% less efficient in moving heat than R12! I remember I had the wrong seals and it leaked some oil, so I put some more in.Bohica - I tested the pressures. B. The R134a compressor has a 1/8" step in on the high side port. Its chemical symbol is CH2FCF3. When the ambient air temps get above 80F the gauge readings can run a bit higher on the high side and lower on the low side when using R134a. Above this temperature, the saturation pressure of R134a is higher than that of R12; below, it is lower. You will be fine with a 134a-compatible TXV running R12. Also the new quick connect fittings for the high & low side. Jun 19, 2007. The primary function of the design engineer is to make things difficult for the fabricator and impossible for the serviceman. Bookmarks: Digg; del . Most vehicles manufactured before 1993 have the R12 A/C system. Agram a retevis rt22 password i bastrop county district clerk records el material que oferim als nostres webs. Does it matter - assuming both are new & uncontaminated? 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. Have a look in the FAQ Section, and look for "Fan clutches & testing them". R134a compressors are substituted as new to retrofit the R12 system compressor part numbers with different height sealing washers. The symbol implies that R12 is a composite of carbon, chlorine, and fluorine. 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. The global warming potential of R134a is 1430. A/C Expansion Valve Replacement Cost. leading to corrosion of expansion valves, capillary tube plugging, and compressor bearing . compressor, condenser, evaporator and expansion valve are specifically designed for use with R134a. Performance doesn't seem to have improved. |. Then, subtract that result by 0.25 pounds to get the proper amount of R134a charge. Additionally, R134a was introduced as a replacement for R22 and R12 in high and medium-temperature refrigeration systems like domestic and commercial chillers. #4. 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. For example, at an evap temp of 30 (your daughter's system is probably running around 25-28 saturated in order to give a 32 duct temp), the pressure of R-134a is 26.1psi. Before we mentioned that you can add approximately 5-6 ounces of ester oil to the compressor. So that indicates it is cooling well there doesn't it? This refers to BTU's (heat) moved per pound of refrigerant moved. The general practice of charging the system with 15% less refrigerant adds to the thermal deficiency of R134a. There is only a temperature switch on these cars as far as I recall, and it just switches on the aux fan. Since the hose is the stock hose, you cannot tell what refrigerant is inside. These two refrigerants are the older types and are not used in newer refrigeration and air conditioning systems. and recharged with mineral oil and 2.2 lbs R12. I have one can left, so maybe a plan can be made. . R134a vs R12 - What is the Differences? - Rx Mechanic Even if the system leaks, repairing the leaks and recharging it with R-12 is usually the best repair alternative. 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 problem with using an approved alternative refrigerants other than R134a is that when the system is serviced it requires certain types of fittings, labels and dedicated equipment. Can I use the one for the R-12? R12 to R134a change expansion valve? - HVAC-Talk: Heating, Air Interestingly, theres one oil type that works perfectly with both types of refrigerants. This is a great space to write long text about your company and your services. Swapping the components isnt a herculean task, but recharging the AC is a challenge. Its among the greenhouse gases and will keep adding the current problem of heat not leaving the earths atmosphere. Well, I'm not sure it is 'fine' - it doesn't cool very well in 95F weather. CLUTCH CYCLING SWITCH. The original expansion valves work very well with R134a. Any ideas from the info above? I had a 1991 BMW switched to 134a by just changing the low pressure charging valve, flushing and refilling with 134 (maybe with 10% . The best oil that runs well with R134a is PAG oil or Polyalkylene Glycol. The AC usually does not work at all. What is needed? Note that passwords are case-sensitive. Any advice appreciated. The current expansion valve is FF - 1/4 - C. Is it neccesary to replace this valve? If the system was upgraded by a professional it should have an upgrade sticker. Just had knee surgery yesterday, so I"M not exactly hopping around too well. Though - the valve for a 1991 says R12 on it, and for a 1994, it says R-134a. The old compressor used R12 and the new unit will be R134a. 42 (at best) w/ 134A in 2000 isuzu trooper. is good, then I should be looking elsewhere? 5. How about evacing 1 pound of refrig from the system, and then putting 1 lb of pure R12 back in? Its cylinders are colored white. Therefore, its most suitable for both commercial and domestic environments. The cable is adjustable at the valve arm. (You must log in or sign up to reply here. 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 system has been previously converted to R-134a. I am ordering new parts, and planning to convert my system to R-134a. 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. For R12, its mineral oil. For instance at 25 F the pressure of R-12 is 24.6 PSI and the pressure of R-134a is 22.1 PSI. Blows pretty hard on full. R134a refrigerant fittings are different size. R 134A is designed for the high demands of an automobile AC and cannot be used on refrigerators due to pressure differences. 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. 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. 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. link to How to cut off a Catalytic Converter. When the temperature is reduced to-7C or below, the plants ability to cool the airdrops significantly. The ratings for evaporator temperatures 40F, 20F, -10F, -40F in the capacity tables are in accordance with ANSI/ARI = R134a Charge Level R12 Expansion Valve = 201 830 06 84 R134A Expansion Valve = 201 830 04 84 Is there a difference after all? I mean, really a lot. We ALWAYS want to know the pressure readings! Compatible with multiple applications: The major reason for the introduction of R134a was to replace R12, so it functions perfectly in the same range of applications like rotary, screw, and centrifugal compressors for air conditioning and refrigeration. 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. Stability: RR12 doesnt disintegrate even under extreme operating conditions. R404a is a zeotropic blend with a temp glide , because of the mixture of 2 or more refrigerants. Dimensioning of refrigeration components - part 2 - Danfoss 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. Stopleak is also risky. Can I just use an adapter and save $200? Your average garage that works on a/c on the side probably would not have this. difference between r12 and r134a expansion valve. The oil is spread all over your system when it is at rest. 1) Warm Air From Vents. How to Convert R12 to R22 | eHow Stay home and grill your own steaks and stir your own martini. Pray I can let some oil out of the compressor without losing my precious R12. Consider using the newer valve, even with 134a stamped on the valve. 34 in 70 series w/ R12 in 100+ Tucson, AZ summer heat w/ hd-t, w/ 13B-T is was unbearable about 31 at vent w/ R12. Best for varieties of operating conditions: Its boiling point is -21.6 Celsius. If the system was upgraded by a professional it should have an upgrade sticker. R134a vs R12 refrigerant? . 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. 3 ounces? 30 deg is pretty coldSystems generally run between 40 and 43 deg. Is that reasonable?Vent airflow is good, I think. If you have the work done, be sure you find a true "A/C" shop that can make up lines. 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). R134a has a smaller molecule than R12 so R134a will leak out sooner than R12. I don't believe it is but I had a service guy tell me it needs to be done. Most importantly, the oil used in the plant must always be compatible with the refrigerant used. In large application systems, the vapor density of this refrigerant is usually high. 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. The next piece of equipment to track down leaks is a leak sniffer. Carefully study the chart and compare the following: To a large extent, the choice is up to you. gital control scheme. My turn to LOL - greasiesel! R12 systems used mineral oil, but unfortunately mineral oil doesn't dissolve in R134a. GWP is a measurement of Greenhouse Gases and their effect on Global Warming.
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