we convert older systems where i work all the time and they work fine. I remember I had the wrong seals and it leaked some oil, so I put some more in.Bohica - I tested the pressures. Anyone know what happens when an R12 expansion valve is used in a system charged with R134A? Performance doesn't seem to have improved. With the knowledge of the differences, youll be able to draw a comparison between R12 vs R134a efficiency. The evap is hard to get at. The general practice of charging the system with 15% less refrigerant adds to the thermal deficiency of R134a. 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 common problem when converting from R12 to R134a is lack of knowledge or equipment. What effect would it have on performance, if any? Just because the radiator does not boil people assume that the cooling system is ok. Helical and Serpentine coils. I've done the FSM test and with 81F ambient, the vent should be 50F. The original expansion valves work very well with R134a. I have one can left, so maybe a plan can be made. Welcome to rxmechanic.com. With R134a you do not rely on the site glass. Please enter a valid email address for yourself. How an A/C Expansion Valve Works. Yes, I don't trust the heater valve either. . The condenser water inlet temperature and flow rate are controlled with the use of a . Superheat you can consider to be the additional amount of heat. 4.R404A R134a increased mass transfer resistance to reduce the transmission chamber heat coefficient, while R507 heat transfer coefficient is higher than R404A. When the sensor detects the refrigerant leak the sniffers lights glow and the sniffer makes a noise. look at the difference! They have no moving parts. The global warming potential of R134a is 1430. If you have the work done, be sure you find a true "A/C" shop that can make up lines. 5. Recharge the compressor with a/c ester oil and a tracer dye. Different correction factors are applied to other refrigerants. and recharged with mineral oil and 2.2 lbs R12. Generally you follow the refrigerant flow moving from connection to connection, component to component, and you sniff the a/c vents to check for evaporator leaks as well. 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. 2) Frost on the Vents. Any advice appreciated. This refers to BTU's (heat) moved per pound of refrigerant moved. I bought a relay to put on it connected to the compressor clutch. hardly noticable. A/C receiver difference between R12 and R134a? RULES for AOP - Owner Assistance and Contractors, Energy Efficiency and Building Performance Discussion NEW, Carnak Zone/Locked Areas - For Professional Member Only, How To Become a Pro and Rules For Pro Members, Pro Forum: Refrigerants and EPA regulations **NEW, Pro Forum: Residential Refrigeration and Appliances **NEW, Pro Forum: Equipment Recalls and Bulletins **NEW, Pro's Forum: Building Science Discussions, Educational Forums - Open for all in the industry, Welcome to HVAC-Talk's Educational Forums, How to Submit Links, Articles and Quiz Questions, Frequently Asked Questions About Submissions, Physics, Thermodynamics, Fluid Flow and Combustion, Educational, Training & Reference Information, Manufacturer's Technical Information Links, Electrical Theory, Circuits and Electronics, HVACR Equipment, Components & Accessories, Accessories Humidifiers, Air Cleaners, HRUs, Fans, Filters, etc. This means that it has a high potential of causing depletion to the ozone layer. In cases such as this, the required capacity value of the expansion valve with R134a is reduced by 30% (correction factor 1.42). The first vehicle that used the R1234yf refrigerant was the 2013 Cadillac XTS. Refrigerators generally utilize R22, R32, or 410A-based coolants as their cooling agent. 37 in 2005 tacoma, R134A. R 134A is designed for the high demands of an automobile AC and cannot be used on refrigerators due to pressure differences. Above this temperature, the saturation pressure of R134a is higher than that of R12; below, it is lower. R12 Expansion Valve = 201 830 06 84 R134A Expansion Valve = 201 830 04 84 Is there a difference after all? Hopefully after you have read this entire page you will have enough information to determine which type of refrigerant is best for you. R-134a can actually cool better than R-12 in a well designed R-134a system as it has better thermoconductive properties, but all the high pressure issues have to be addressed.But even when these cars were brand new, didn't cool worth a damned, recall almost dying in one in Las Vegas at the time, but a good way to lose weight with gallons of perspiration pouring out, just don't let that drip on the seats, that is inappropriate. What is needed? By after changing just about everything, he got what was termed, satisfactory cooling. If the charge is low the compressor will cycle on/off in the max AC position. The cure is to use the newer R134a compressors is sealing washers that are different thickness. Debug the condensor (I am a computer nerd after all!)3. CONCLUSIONS The differences in the theoretical C.O.P.H calculated for R12 and R134a are consistent with values quoted in the literature. It is made up of carbon, hydrogen, and fluorine. This leads me to labor over every small decision. Typically 5 to 6 ounces of a/c oil is adequate but this may vary depending upon the car. Even if the system leaks, repairing the leaks and recharging it with R-12 is usually the best repair alternative. The difference between R12 and r134a is the BTU carrying capability. difference between r12 and r134a expansion valve. The larger fitting goes on the discharge port and the smaller fitting goes on the suction line or compressor inlet / suction port. R134a is otherwise called 1,1,1,2 Tetrafluoroethane, Florasol 134a, Freon 134a, Norflurane (INN) or HFC 134a. 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. So I probably put the highest suggested amount in to be safe. 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. The aux fan didn't switch on though and I didn't check the high side temperature. gital control scheme. 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. Once you have replaced the OEM condensor with a PF unit, you will need to make custom hoses to mate with your OEM system. Bohica, I appreciate your help with this. Is that why expansion valves are specific to R12 or R134A? On the other hand, R12 has a global warming potential of 10,910. Boiling Point: R134a refrigerants boiling point is -26.3C (-15.34F). sparkee said: Thanks for the Service Bulletin. For example, if your system originally had 36 ounces of R12 then you multiply that by .80 and you have 29 ounce of R134a. R12 and R22 are both now banned by the EPA in the United States. However, you can convert R12 to R134a by yourself, save money and keep all the tools purchased. A good T/C, clamped to the line & insulated gives a repeatable measurement of the tube. VerticalScope Inc. All Rights Reserved. Yes, this was a smokers car. CR4P). I had a 1991 BMW switched to 134a by just changing the low pressure charging valve, flushing and refilling with 134 (maybe with 10% . 2022 nba 2k22 starting a fashion label signing the designer, a difference between r12 and r134a expansion valve, 2020 white paper of the church of pentecost, Chime Mobile Check Deposit Funds Availability, Why Does James Kill Donald In The Vanishing, nba 2k22 starting a fashion label signing the designer. ing the expansion valve, a maximum opening superheat of 7F, and a standard factory air test superheat setting. This is 11F off the FSM performance graph - vent should be around 50F. 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. The newer valves and switches will work with both refrigerants. The money you will save by will pay for the R12. It is perhaps possible to locate a unit with a company that purchases close out or distressed merchandise. At 40, it is 35psi, which is a difference of 8.9psi. Compared with the cost-performance ratio, R507 is 30-40% . All pre-97 XJs use systems with the same basic operating principle, although the parts do change a bit. Before R12 was replaced with R134a in 1995, it was mostly used in trucks and cars. ). 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. 42 (at best) w/ 134A in 2000 isuzu trooper. Hope this helps. R134a refrigerant is about 10% less efficient in moving heat than R12! Bookmarks: Digg; del . . In more serious, it could result in cardiac irregularities or death. 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. 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. 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. Given two identical vehicles, each with the same weighted amount of refrigerant, the vehicle with the R134a has the capability to remove more heat (measured in btus) from the vehicle than the same type of vehicle using the same amount of R12. There are three different refrigerants officially sanctioned by the EPA for automotive usage: r-12, r-. Please enter the name by which you would like to log-in and be known on this site. I mean, really a lot. I would not do a 134a conversion without a PF condensor. "Howdy, Folks!" (You must log in or sign up to reply here. You are indeed 20% out of the OEM spec for cooling. If you you dont have the free time to play then you are better off to pay a technician. Comparatively, larger R134a molecules should take more space, and a smaller amount might be required. Als nostres webs oferimOne Piece,Doctor Who,Torchwood, El Detectiu ConaniSlam Dunkdoblats en catal. BTW, I use a stick thermo in the vents and the laser on the condenser. Very interesting! However, theyre still used in older plants, systems, and the automotive industry. So, instead of using R12, other better options include R401b, R134a, R401a, etc. Trinary Pressure Switch quantity. system of 0.33 TR and refrigerant used was R12. R134a is the most widely accepted alternative automotive refrigerant used to replace R12. Figure 2 shows the different phases and pressures the refrigerant . Catalog E-1, Thermostatic & Automatic Expansion Valves / Page 1 Table of Contents . R12 contains a chemical called chlorine that destroys the ozone layer, thereby causing potential environmental risk. Miscibility with oil: R12 can be mixed with the compressor oil no matter the operating condition. Also called the orifice tube. We've updated our forums!Click here to visit the new forum, Year: 1991Make: Jaguar Model: XJ6Engine Size: 4.0. 2001-2023 Griffiths Technical Inc. All Rights Reserved. As R134A refrigerant has different operating characteristics and pressures this valve is not necesssry. By noting the ambient temperature you can look up what the preferred high side pressure should be. However, the supply houses don't indicate a difference. 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. 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. Hot coolant migrates up through the core by convection (is that the word? 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. Moreso, it had been banned. 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. A comparison between R12 vs. R134a temperature will show that R12 has a higher temperature than R134a. In practice this means that the car can overheat and the aux fan will stay off! The approval is very legal one, governed by the U.S. EPA. Thomas Jefferson, Thanks,OK, I'm starting to feel a little better about it. It is possible I have 10 ounces (250 ml) in the system. Ask Our Pros-Owner Assistance - NO DIY advice will be given. The oil used in R12 systems is not compatible with R134a refrigerant. R-12 - yellow R-134a - light blue R-22 - green R-402A - light brown (sand) R-402B - olive R-404A - orange R-407C - medium brown R-410A - rose R-507 - teal J Originally Posted by goldNSX. The cure is to use the newer R134a compressors is sealing washers that are different thickness. In a car ac, using this type of freon 20 years ago was difficult. 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. Compressor. 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. That switch should close @ 52c. I don't recall all the details, but starts off with the largest parallel flow condenser and improved fans. You can use the R134a retrofit capacity chart for this purpose. R134a Refrigerant Recharge Kit with BPV31 Bullet Piercing Valve and R134a Quick Coupler, R134a/R-12/R-22 Freon Refrigerant Hose Can Tap Kit for A/C System - Easy to use. 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. Look deep into the fins. AFAIK, there is no clutch on the engine fan on the 240D. I'll put the relay on for that. All fans must work at 100% of the OEM rating. Mark Baker R-401b is the mixture by weight of 61% R22, 11% R-152a and 28% of R-124. Rules governing changing from the former to the latter differ between countries. Only show this user. In sum, R12 has done more bad than good. Make sure visiually that no large gaps exist that would allow the air to bypass the condensor on the way to the radiator.B. Bottom line, R134a simply doesn't cool as well as R12. Spray it deep, and let it sit for a few minutes. 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. Add to cart. Crap! . 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. The experimental values of C.O.P.H obtained with the R134a/ester charge were 20.2% We say generally because the vehicle manufacturer may have a formula already worked out for the R134a conversion process. R134a has a smaller molecule than R12 so R134a will leak out sooner than R12. I have some experience with auto a/c but not too much. You can use this space to go into a little more detail about your company. Its highest value is 1. Since there is only about a 10% difference between R-12 and R-134a, the expansion valve being self-compensating really doesn't make that much difference. Generally the system will be initially charged with approximately 80% to 85% of the original amount of R12, using R134a. To ensure the right charge, you must fill the new system with between 75 and 85% of the factory-set capacity for optimal cooling. It is also used in automotive car conditioning and the plastic industry. Generally this works well for the whole system. Therefore, the R12 refrigerant is illegal, and emitting it is illegal. R12 is used in several applications like low temperature, medium temperature, and high-temperature applications. Statisicaly your friend was lucky. Get to the point where I can walk without crutches2. 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. It was later found that R-134a had a very high Global Warming Potential, or GWP, number. 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. However, if it is taken close to a fire flame or any electrical heating element, it disintegrates into toxic products. Just leave it alone for now. Then when it is switched off for a few minutes and then back on, the air cools again. The expansion valve(Tx) is in the car at the inlet line to the evaporator with compressors you best get advice from an ac specialist shop as the differences could be the gas that it pumps some systems use R12 and others use R134a or later gas yes R1234yf Freon gas can be replaced by R134a; the newer systems were designed with this in mind so no, there will be no damage to the compressor but some time in . The primary function of the design engineer is to make things difficult for the fabricator and impossible for the serviceman. Could that be screwing up the systems performance?Anyway, when I installed the system, the new TXV (is that short for expansion valve?) 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. 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. GWP is a measurement of Greenhouse Gases and their effect on Global Warming. 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. Neuro spine Super Speciality Clinic - Above Apollo Pharmacy, Bangarpet Circle, Kolar - Bangarpet Road, Kolar Town. Besides, its technology has been tested and trusted. R134a is NOT less efficient than R12 Actually R134a is more efficient. Gnats & mosquitos will clog deep. Hmmmm. For R12, its mineral oil. Production of R12 ceased in 1996, although it can still be reclaimed, purified, and resold, and small cans of New Old Stock R12 are still widely available on eBay and Craigslist. Its chemical symbol is CCl2F2. R-12 is no longer used or produced in many countries and remaining quantities have skyrocketed in price. Rules governing changing from the former to the latter differ between countries. My turn to LOL - greasiesel! That way I will have reduced the oil by about 1/3 (assuming the oil is mixed evenly through the system). From memory, I put in at least 8 ounces of oil, probably around 10 ounces in there. 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. The cable is adjustable at the valve arm. You'll want the expansion valve matched to whatever refrigerant you're using. shown for the parallel flow, aluminum condenser that is listed. 3) A TXV optimized for 134a will be ok with R12. 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 . Shorting the plug for the refrigerant switch should run the fan when the compressor is on. It does not "pool" to any degree in a large amount anywhere. Answer: OK, I'll bite. We consider the the various types alternative refrigerants that are illegal or not approved to be in two sectors: non-flammables and flammables. You either get a system that will function well with R1234yf or get any other type. You should keep in mind that recharging your air conditioner improperly could result in more serious damage. Then I'll put the ball valve in on the coolant and test it and see what we have. Also, if you want to know what happens if you put R134a in an R12 system, you should first confirm if the R12 system can be replaced or if the refrigerants can be mixed. He used thermostatic expansion valve and Capillary tube for analysis with R12. Its chemical symbol is CCl2F2. As for R134a and R1234yf, theres no room for conversion. The #1 question asked by NEW MEMBERS. With tube & fin condensors in MVAC applications there is never "too much" airflow. What is a good differential? 05-25-2017 02:14 AM. Then again, there are two different expansion valves. Does it matter - assuming both are new & uncontaminated? With that said, I would source the TXV from another source such as NAPA just to avoid any problems. The safe high side pressures are determined with a PT (pressures and temperatures) chart. Swapping the components isnt a herculean task, but recharging the AC is a challenge. Kommentare . We mention using ester type refrigerant oil. 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. But as there's not a big difference, people say you can suffice with either. 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. 4 Stars & Up & Up; 3 Stars & Up & Up; 2 Stars & Up . Edited: Sat July 14, 2007 at 10:22 PM by fonebone. There are significant differences between R12, R134a, and R513A, which must be considered when handling, processing, applying, or retrofitting with these refrigerants. Any suggestions, or do you need to know the hi/lo readings? Best for varieties of operating conditions: Its boiling point is -21.6 Celsius. difference between r12 and r134a expansion valve. Right now you know you have a bit too much, but with a CR4P compressor this is an insurance policy. 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. R12 is CFC: Even though R12 is one of the most commonly used refrigerants, it is CFC. The original CFC expansion valve used for R12 needs to be replaced with an HFC one for 134a to feed the evaporator correctly. 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. 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. R-134A has a slightly lower pressure at evaporator temperatures (30-40 degrees), but R-134a also has a much higher pressure at condenser temperatures (120-150 degrees). Still, I have some simple green, so may as well give it a go. Since then, the industry standard has been R134a, which is an efficient replacement. Can I just use an adapter and save $200? R12 was once used in many air conditioning units as a refrigerant or cooling agent. 5. The major reason for the replacement of R12 with R134a was to curb future greenhouse effects. -------------------------"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." Sense ells no existirem. As noted, measure up front as best as you can to get as close to the aftermarket dim. Below are the major differences between R134a and R12: Chemistry The chemical composition of R12 and R134a differ. had writing on the side that said R134a. The best oil that runs well with R134a is PAG oil or Polyalkylene Glycol. Paul:A 1983 240D should have a York compressor on an OEM system. R134a and R12 are both refrigerants used in vehicle air conditioning systems. That would be the "black death" syndrome. 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. Plus, not releasing the chemical into the air is morally justifiable. -------------------------"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." 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. The P H and T cond,sat of the HR12 at a T oa of 40 C were higher than that of the R134a, resulting in a higher P e than that for the R134a. Should I do the test again with the the aux fan jumpered? bokoen1 hoi4 the great purge / meryl and maks dancing with the stars / difference between r12 and r134a expansion valve. Then again, there are two different expansion valves. 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 Nice to use new gadgets! Whether R134a performs as well as R12 in any given a/c system depends upon system components and the amount of R134a used. Ensure you contact a professional mechanic to do the work for you so you dont end up incurring more costs for yourself. James10952001. difference between r12 and r134a expansion valve why is miles raney not on homestead rescue June 21, 2022. manila mayor candidates 2022 Biggest you can fit in there is best. So to keep things simple and to avoid controversy and politics we have R134a. However, take note that R134a refrigerants are manufactured specifically for automotive air conditioners. Is the information not applicable to the old Pantera system? 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. Above this temperature, the saturation pressure of R134a is higher than that of R12; below, it is lower. Since 2010, all home AC systems manufactured use a refrigerant like R134a that has zero ozone depletion potential (ODP). Nick, I hear you - there maybe nothing to do here. About four or five years ago, I guy with an MB came here with the same problem, that tread was over six pages long. Do I leave the orignal condensor in, etc?Thanks. 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. The name of the oil is Polyol Ester (POE). _____ 2012 E350 2006 Callaway SC560 . This would become an expensive investment for a repair or service station to have unique dedicated equipment for every type of alternative refrigerant. Jun 19, 2007. Also, it can be used with all types of compressors. It slowly gets warmer and warmer in the car, even at highway speeds. Even with proper fan operation, missing seals & air dams can effect condensor effeciency. We suggest dumping the old refrigerant oil in a clean container and inspect the oil for sludge or waxing (old oil that has gelled) and contamination (metal particles). It's best to determine on a case-by-case basis while monitoring system pressures and output air temperature. #19. a 50f delta across the condensor is good, but I suspect that is an idle reading. You can spend long evenings reading about the differences between the two refrigerants. By: james smith underoath; Comments: 0 . R134a is called tetrafluoroethane (HFC). 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. B. The reason is that the vehicles, for instance, manufactured currently configure the engine for R1234yf refrigerant, making no provision for replacement. 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. I don't know where it is getting the switch off command, or why the vent temp drops steadily. The pressure at low temperatures is nearly the same between 12 and 134a. Flushed, vacuumed etc. In this study, without the need for major modifications to the bus air conditioner, the variation of the ejector dimensions according to different parameters has been investigated in the case of using the R1234yf, R1234ze(E), or R600a refrigerants, which may be a substitute for R134a as a refrigerant due to . But R22 is almost equally damaging. In large application systems, the vapor density of this refrigerant is usually high. A. Pressure/temperature plot of R134a vs. R12 is shown in figure 1. I'm having the same concern. Though - the valve for a 1991 says R12 on it, and for a 1994, it says R-134a. 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. At this point it is time to make an appointment with the a/c shop. _____ 2012 E350 2006 Callaway SC560 . 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.
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