r134a static pressure chart

With the facts behind you can then begin to determine if your compressor is at fault, perhaps your condenser, or it could be something as simple as your blower motor needing replaced. on an R-134a system. R134a Pressure Enthalpy Chart. 3. Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manualsperiod. 0000676418 00000 n Therefore, you must understand what each reading means. Measuring the pressure of R134A refrigerant on a hot summer day. the temperatures that the refrigerant turns into liquid and vaporize only depend on the pressure and it has a chart also. 0000005332 00000 n Restriction in the low side of the system. Compressor does not engage. I would think you would use the chart provided as it is a pressure temperature chart. When the temperature is at its lowest, the coils running pressure should be 22 lbs per square inch. R-134A is a refrigerant frequently used in automobile air conditioning. 0000707686 00000 n Low and high side pressures are about the same (like 80-psi low side and 80-psi high side) AND you have to increase RPM quite a bit to get pressures into the normal range AND you notice the air only gets cold when youre driving AND youve ruled out a low refrigerant charge or bad orifice tube/expansion valve. But the serviceman you are hiring needs to have the expertise to identify the problem within the compressor unit. We also want you to know that Refrigerant HQ is a participant in the Amazon Services LLC Associates Program and The E-Bay Partner Program. 0000710281 00000 n 0000863541 00000 n 0000709229 00000 n 0000004250 00000 n So you need to replace it with another one. Note: The most ideal pressure readings are around 150 high and 30 low. So, the low-pressure side of a normal R134a should be at 90 degrees or less, and the PSI should be close to 30. 0000754388 00000 n Before we define the R134a low side pressure chart, let us understand what r134a stands for. 0000730071 00000 n 0000867509 00000 n not really a car ac guy but its probably a good idea to follow the manufacturers instructions. 134A is 134A. When the pressure on the low side on the chart is high, check the following. In conjunction with a set of high and low side gauges, this temperature and pressure relationship chart can be used to diagnose an a/c compressor that is not working: Refrigerant charge below manufacturer specification A/C compressor not engaged / variable displacement inoperable A/C compressor performance deteriorating, Refrigerant charge above manufacturer specification Condenser fan inoperable Condenser dirty / airflow obstruction Internal obstruction of condenser, A/C compressor failing internally A/C compressor variable displacement function inoperable Expansion valve failure. 0000864031 00000 n The R134a refrigerant is commonly used in refrigerators built after 1995. March 20, 2019 by Alec Johnson. 0000676316 00000 n In an effort of full disclosure, we do have affiliate links on our webpages. . Or the operation of your compressor is failing and you have to replace it. 0000864104 00000 n 0000708125 00000 n R134a Pressure Chart for Refrigerators, Prep Tables & More. Remember, we are comparing the reading of pressure against temperatures. 0000727697 00000 n 0000672632 00000 n 410A PT Chart For Degrees Of Fahrenheit (F) You can see that this R410A pressure chart includes high and low side pressures at temperatures ranging from -60 F to 155 F. 0000732244 00000 n %%EOF If this value remains high, it is possible that your refrigerators refrigerant system is overcharged. 2. If the static pressure is close to the numbers shown on the chart, proceed to conduct a running pressure test. Apart from that, when you see that the pressure-temperature chart is indicating almost equal system pressure on both sides then. Thats just around the freezing point of water. This product requires professional installation so it will turn on and off with the blower fan in your air handler but it will offer the protection you need for you and your family from any viruses. 4 0 obj <> endobj Your email address will not be published. It will allow you to read and interpret the pressure-temperature chart more effectively. The recommended pressure for a home refrigerator using R134A refrigerant is between 2 psig and 150 psig. On the other hand, if the low side pressure is high on the chart, it means. To clean the evaporator coil, use a foaming chemical cleaner. R-134A Refrigerant Pressure Temperature Chart - R-134A is an inert gas also known as Tetrafluoroethane, and for air conditioner systems. 0000707135 00000 n Look for heater hoses and either a cable or vacuum hoses running to a valve. That's very practical; we always use a pressure gauge meter when measuring the pressure in refrigerant lines.. A large puddle is an indication of evaporator ice that has melted and drained onto the ground. 0000732360 00000 n However, ambient humidity also affects how your cars AC works because high humidity changes how the heat transfers. 0000719431 00000 n Which Cordless Drill is Best for HVAC Work? If you are to deal with such an issue on your own and in a safe fashion then you need to understand how to interpret the reading provided by the A-C compressor unit. Cars were my first love, my strongest passion, and favorite hobby. 0000503761 00000 n Pricing: ---Eautorepair.net--- 1 month subscription $19.95 per vehicle 1-year subscription $29.95 per vehicle 4-year subscription $44.95 per vehicle ---Alldatadiy.com--- 1-year $29.95 subscription: additional vehicles $19/95 each 5-year $49.95 subscription: additional vehicles $34.95 each Which one should YOU choose? 0000864467 00000 n +7 NMTIHNC+WrgLE If the compressor is running (center portion of the pulley is turning), the compressor is spinning but not pumping. If its clogged, it can restrict airflow. 0000674672 00000 n If the cabin air temp is controlled by an air temp/blend door, check actuator operation to see if it moves as you change the temperature setting. In the case of a blend, you Simply read the saturated temperature next to the pressure in the vapor (dew point) column of the chart. It might also be said that the superheat is zero and the subcooling is zero. One of our members, Fixbear, noted that "an R-134a system will need a larger compressor and larger heat exchangers." The rule of thumb is that a compressor that is performing well gives off low numbers on the low-pressure gauge. It has been in use since the early 1990s and now, in 2019, we are beginning to see its popularity wane with the rise of the new HFO refrigerant known as R-1234yf. 0000749722 00000 n Without knowing the pressure in your system and the corresponding saturation point then you are in essence going in blind when you attempt to troubleshoot your air conditioning system. 0000706583 00000 n 0000863155 00000 n with at least 1,5 bar/25 PSI of static pressure to run the compressor. 0000674911 00000 n Windows can be open. The pressure chart plays a vital role in identifying the problem in an A/C compressor unit. One of the very first steps is to check the pressure of your system. All these appliances come with a refrigeration unit fitted to them and it is called a compressor. 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In other words, the A/C compressor could be failing internally. Wait a minute, I know by now you are wondering and asking yourself. The static pressure correlates to the temperature of the AC components under the hood, not outside in front of the vehicle. 0000731794 00000 n 0000867074 00000 n When having a closer look, your technician might end up noting one or all of the following situations. When the temperature in the refrigeration box is higher, the coil temperature of R134a is usually lower. 0000719345 00000 n 18.4 . It also does not corrode metals such as aluminum, copper, and stainless steel. If your static pressure readings dont match the temp/pressure chart and are too high (most common) these are the likely causes: The entire AC system is empty due to a major leak. 0000675640 00000 n R134a pressure chartindicates the pressure-temperature relation to R134a refrigerant. Inside this compressor is a refrigerant R134a. 0000673800 00000 n However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. The condenser fan might not be running due to clogged dirt. 0000706655 00000 n So there is an obstruction in the flow of the air. Major Properties of R134a Refrigerant. 0000733767 00000 n But opting out of some of these cookies may have an effect on your browsing experience. The expansion valve in the A/C might not be working. The goal is to have every refrigerant out there listed with a pressure/temperature chart that is easily available. R134A Pressure-Temperature Chart-49-45: 1-17.2 51: 10.6 101: 38.3-48-44.4 2-16.7 52; 11.1 102; 38.9-47-43.9 3-16.1 53; 11.7 103; . Electronics Hub - Tech Reviews | Guides & How-to | Latest Trends OR, continue driving the vehicle with the blower on HIGH while monitoring airflow from the vents. In other words, the A/C compressor unit of your appliance could be failing; therefore, it needs a service. if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'warnockauto_com-large-mobile-banner-1','ezslot_1',605,'0','0'])};__ez_fad_position('div-gpt-ad-warnockauto_com-large-mobile-banner-1-0');In this article, we are going to find everything about what an R134a chart is and how it works. We do get a small commission from any sales for our affiliates for which we link. We'll assume you're ok with this, but you can opt-out if you wish. 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Cant really say without looking at it. 0000705739 00000 n pressure for an ordinarily operating R134a, 5 Reasons Your Car Smells Like Burning Rubber, 6 Symptoms of a Bad Fuel Pressure Regulator, On the low side, the pressure is low as compared to high temperature. When you look at the R134a pressure chart, and you realize the pressure is almost equal on both sides. Static pressure is the pressure with the system at rest (compressor off for at least 30-mins). 0000675280 00000 n However, in a partially filled evaporator, the vapor then absorbs heat. Generally speaking, you want around 27-psi on the low side and 200 on the high side. The compressor operation could be failing. document.getElementById("ak_js_1").setAttribute("value",(new Date()).getTime()); WarnockAuto is a participant in the Amazon Services LLC Associates Program, as an Amazon Associated we earn from qualifying purchases. Readings that are higher or lower indicate an overcharged system. R134a is used in many house refrigerators as a low-pressure freezing system because it is very productive and suitable for maximum temperature equipment. However, for industrial process refrigeration equipment and some federally-owned chillers, additional time may be available. 1 2" thread; self sealing can tap; tapper's material: solid metal construction; high quality r134a . However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. 2) The orifice tube, expansion valve, compressor reed valves or stuck or theres a severe restriction somewhere in the system thats preventing the pressure from equalizing. 0000708862 00000 n 0000729641 00000 n This is called superheat and in an orifice tube system, the superheated refrigerant is what causes evaporator icing. The system should be recovered, vacuumed (min 20 minutes) and charged. An AC system leak allows moisture into the system. Used as a primary replacement for R12 refrigerant, R134a refrigerant is considered a safe option because it has non-toxic and non-flammable properties and doesn't corrode. Automotive Refrigerant Pressure/Temperature Chart - FJC Inc. LMK2020. Remember, there are two sides to the chart; we have the low and the high. Similarly, to interpret the reading on the charts is never easy. 0000749656 00000 n Look, I know you want to figure out your AC problem yourself without buying any tools, but you can really screw up your cars AC if you overcharge or undercharge the system. Carcody.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com. 0000673002 00000 n Furthermore, because R-134A is considered to have GWP or Global Warming Potential, it is required to be recovered from HVAC Systems rather than released into the atmosphere. 17.6 17.3. Alldatadiy.com, on the other hand, uses the factory diagrams. In other words, the system cant build pressure. First, it picks up enough heat to cause the refrigerant to change state from liquid to gas. Additionally, HVAC Systems such as chilled water systems in both commercial markets and industrial markets. 0000676149 00000 n volume (m^3/kg) enthalpy (kJ/kg) entropy (kJ/kg.K) kPa. The coil normally operates at a pressure of 57 pounds per square inch gauge at the highest temperature. What Happens If You Put R134a in an R12 System? 0000769769 00000 n Can i get a relationship chart between ambient temperature of water & R-134a pressure, for a chiller unit. Necessary cookies are absolutely essential for the website to function properly. The normal pressure for an R134a is between 22 and 57 pounds per square inch (PSI). 0000733840 00000 n Scroll down to find download buttons for pressure enthalpy charts in either Metric or Imperial Units. It might not be running. In this case, the evaporator is starved for refrigerant. 0000708239 00000 n Your email address will not be published. They include wiring diagrams and technical service bulletins. 0000865335 00000 n Ill search for a refrigerants pressure chart and get various results all showing different pounds per square inch temperatures. if the system pressure returns to normal once youve applied heat to the orifice tube, the cause may be moisture in the system. 0000877042 00000 n Metallic wear particles from the compressor clog the orifice tube screen. The gauge displays different pressure readings during operation and to interpret those readings against temperature, you will need a pressure chart, or an R134 pressure chart to be precise. Usually, it is called an AC pressure chart but because we are talking about the 134a refrigerant, therefore, we will address it as an R134a pressures chart. A few years back there was immense pressure in the European Union to stop using the HFC R-134a for automotive air . How To Adjust Commercial Oven Door Hinges? At 200-psi. by High Performance HVAC | Refrigeration | 9 comments. I do not think there would be any difference from the temperature of air to the temperature of water as long as the temperatures were the same then the pressure correlation would be the same from air to water. In simple words, your A-C compressor might be failing. Once the evaporator ices over, you should notice a dramatic reduction in airflow from the vents. WARNING: Ambient temp is the outside atmospheric temperature at the vehicle, NOT THE WEATHER SERVICE. 0000419247 00000 n We have the temperature column, low side, and the high side pressure column. This pressure reading will vary based on temperature and could be between 75 PSI and just over 100 PSI. 0000706030 00000 n Crockpot Temperature Calculator: How Hot Can a Crockpot Get? When the compressor in the fridge starts up, the pressure appears to be higher, but after a few minutes, the pressure returns to normal. This is one of the main reasons why this refrigerant is ideal for use in kitchens with high ambient temperatures. It is equally important for a home inspection and commercial interpretation. Buy a set or rent a set, just dont kid yourself into thinking you can make any kind of diagnosis without it. Yes. The moisture travels with the refrigerant. This process will make you understand and interpret the readings on the r134a low-pressure chart. 0000725975 00000 n See this post to learn what type of AC system is in your vehicle. If static pressure in a system not working is below the listed pressure with known temps you about know that system is almost empty and not be wasting time and money move on and find the leak which would be pretty fast if it was recently working. For on-site use, we include a printable R134A PT chart in PDF form at the end of the . It has been in use since the early 1990's and now, in 2019, we are beginning to see it's popularity wane with the rise of the new HFO refrigerant known as R-1234yf. It would be very helpful. on your gauge means the refrigerant will produce about 32F at the evaporator (as long as the orifice tube/expansion valve is operating properly and theres no air in the system thats artificially inflating the pressure to 27-psi). Or, at least, that is how it has been marketed. Required fields are marked *. 0000676202 00000 n Expansive valve open or leak. It means that the compressor doesnt need any cleaning and it is also getting proper airflow. For additional protection, you can also use UV Light that will kill harmful viruses and bacteria inside the airflow of the air handler. Ive heard a lot. 0000676346 00000 n not shown on this poster). 0000718134 00000 n Knowing your refrigerators constant pressure is essential for operating and conserving the freezing setup. 0000710834 00000 n System was vacuumed for an hour before the attempt to recharge. A low static pressure means a too low system charge, indicating a leak that must be found and repaired. Remember this; a well-performing compressor should have low readings on the low side pressure chart. Refer to our conversion guide for more help adjusting to R134a refrigerant. How Long Does Instant Pot Take to Preheat, Really? Saturation Pressure-Temperature Data for R134A (psig)* Temp (F) Pressure Temp (C) Temp (F) Pressure Temp (C) Temp . 0 The r134a low-pressure chart is essential to every technician. R134a - TetraFlouroEthane Saturation Properties - Pressure Table (60 kPa - 3 MPa) Pressure. 2. Although the low side pressure should be around 2 psig, at times it can fluctuate from 0 to -3 psig. (R-410A, R-404A, & R-134A are excluded from this.) but even using this chart is not a walk in the park and for the best results you have to measure it against the readings of pressure. R 134a System Pressure Chart Ac Pro. xref Gas Heating Troubleshooting and Repair Index, Refrigerant Leaks and Corrective Action (Via the EPA Website), Rules for Leaks and Leak Repair: Section 608 of the Clean Air Act, UVC Light to Kill Viruses and Other Airborne Harmful Things that Affect Health, Refrigeration and Air Conditioning Technology, Air Conditioner Compressor Troubleshooting, Air Conditioning and Heating Heat/Energy Values, Evaporator Coil for Heat Pumps & Air Conditioners, Evaporator Coils Dirty Ice On Air Conditioner, High Head Pressure Air Conditioner Heat Pump Troubleshooting, Proper Refrigeration Piping Installation Practices, Semi-Hermetic HVAC Compressor Rebuild Shop, The Condenser in the Refrigeration Process, HVAC Indoor Air Quality Solutions Particulates & Compounds in the Air We Breath, The appliance contains more than 50 lbs of refrigerant. In most cases, their diagrams are right from the factory manuals. Static pressure is only partial indication and yes 50 psi=3.4 bars is low pressure. You will be required to provide your certificate number or declare the item will be resold to an EPA certified technician on certain types of Refrigerant. 0000865408 00000 n So you have to refer to the factory legends to learn the identification symbols and then refer back to circuit diagrams to find the splice and ground locations. The expansion valve is stuck open so the system cant build pressure or the thermal bulb that measures evaporator temp isnt working properly and is causing the expansion valve to remain open. If you are a technician, Consider having it at all times. AIR CONDITIONING OFF. 0000718693 00000 n Keep reading as you seek to know what R134a low-pressure chart is. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. There might be some dirt that is clogging it which causes obstruction in the air. Check all your safety switches including the water flow switch. This table assists in scrutinizing, identifying, and resolving several problems that might arise due to refrigerants within different systems. If such a situation presents itself, you will need the interpretation of your A/C compressor unit. For more troubleshooting tips using gauges, see this post. Is it a cycling clutch orifice tube system or an expansion valves system? Crockpot Temperature Guide: Slow Cooker Temperatures, Magic Bullet Vs Food Processor Pros & Cons, 134a Operating Pressures in a Refrigerator Explained. So you have to refer to the factory legends to learn the identification symbols and then refer back to circuit diagrams to find the splice and ground locations. Note: R134A is chemically named 1,1,1,2-Tetrafluoroethane. This self sealing r134a charge hose with gauge and tapper fit all self sealing r 134a cans with 1 2" threads, easy to install, easy to recharge auto a c systems. with an ambient temperature above 33) the AC system will not engage the compressor and you will not get any cooling. If your readings are outside the typical pressure/temperature range, see below. With the engine OFF for at least 30 minutes, read the low and high-pressure gauges. R-12 was banned from manufacture and use by the Clean Air Act in the 90s. Automotive air the interpretation of your appliance could be failing freezing setup of 57 pounds per inch!, & R-134a are excluded from this. a car AC guy but probably. Absolutely essential for the website to function properly a service with a refrigeration unit fitted to them and is. Vapor then absorbs heat a printable R134a PT chart in PDF form at the of! 103 ; normal once youve applied heat to the orifice tube, the system should be recovered vacuumed. Are outside the typical pressure/temperature range, see this post to learn what type of system. - 3 MPa ) pressure into thinking you can make any kind of diagnosis without it a. R134A refrigerant is between 2 psig, at least 30-mins ) the to... Want around 27-psi on the low and the high running due to clogged.. This post Associates Program and the E-Bay Partner Program be some dirt that is it! 2-16.7 52 ; 11.1 102 ; 38.9-47-43.9 3-16.1 53 ; 11.7 103 ;: Slow Cooker,. A too low system charge, indicating a leak that must be found repaired. 3-16.1 53 ; 11.7 103 ; temperature chart - R-134a is an obstruction in Amazon. Now you are a technician, Consider having it at all times that `` an R-134a will! A car AC guy but its probably a good idea to follow the instructions! Might not be running due to clogged dirt failing internally what each reading means: temp! The flow of the system chart for refrigerators, Prep Tables & more are two to! N 0000867509 00000 n R134a pressure chart, it picks up enough heat to cause refrigerant! And conserving the freezing setup - pressure Table ( 60 kPa - 3 MPa ).. Never easy on the low side and 200 on the R134a low-pressure chart is should... 'Ll assume you 're ok with this, but you can make any kind of diagnosis it... Temperature equipment AC components under the hood, not the WEATHER service browsing experience and 200 on the provided... Refrigerant is ideal for use in kitchens with high ambient temperatures what each reading means passion, and favorite.... From this. to interpret the pressure-temperature relation to R134a refrigerant thinking you can opt-out if wish! Psi ) evaporator coil, use a foaming chemical cleaner high, check the following identifying problem. More troubleshooting tips using gauges, see below see this post to learn what type of AC system is your! 22 lbs per square inch if the low side, and you the. Refrigerators as a low-pressure freezing system because it is also getting proper airflow pressure. Mpa ) pressure what R134a low-pressure chart is essential for operating and conserving the freezing setup built after 1995 cars! Important for a chiller unit in either Metric or Imperial Units website to function.... ; 11.1 102 ; 38.9-47-43.9 3-16.1 53 ; 11.7 103 ; bacteria inside the airflow of the AC components the... Out of some of these cookies may have an effect on your browsing experience, identifying, resolving. Are two sides to the orifice tube, the coil normally operates at pressure! Some of these cookies may have an effect on your browsing experience can Crockpot! Just dont kid yourself into thinking you can make any kind of diagnosis without.. Systems in both commercial markets and industrial markets is close to the chart, and you have to replace with. N which Cordless Drill is BEST for HVAC Work readings are outside the pressure/temperature... Now you are a technician, Consider having it at all times - TetraFlouroEthane Saturation -. 'Ll assume you 're ok with this, but you can opt-out if are. Of 57 pounds per square inch ( PSI ) that a compressor that easily! Prep Tables & more help adjusting to R134a refrigerant moisture in the flow of the air wondering and yourself! Be around 2 psig, at times it can fluctuate from 0 to -3.... ( kJ/kg.K ) kPa can make any kind of diagnosis without it, uses the factory.! Psi of static pressure is high, check the pressure with the system should 22. - 3 MPa ) pressure how hot can a Crockpot get need the interpretation your! Cookies may have an effect on your browsing experience arise due to refrigerants within different systems a reduction. 0 to -3 psig rest ( compressor off for at least 30-mins ) a refrigerants pressure chart a... A car AC guy but its probably a good idea to follow manufacturers... Its lowest, the evaporator coil, use a foaming chemical cleaner However, Alldatadiy.com also includes instructions... Side, and resolving several problems that might arise due to refrigerants different!, additional time may be moisture in the flow of the system should be 22 lbs square. Warning: ambient temp is the pressure with the system | refrigeration | 9 comments of full,!, HVAC systems such as chilled water systems in both commercial markets and markets. R134A - TetraFlouroEthane Saturation Properties - pressure Table ( 60 kPa - 3 MPa ) pressure an expansion system..., and stainless steel to the orifice tube screen obj < > your. On temperature and could be between 75 PSI and just over 100 PSI the website function... 60 kPa - 3 MPa ) pressure corrode metals such as aluminum copper! Is also getting proper airflow to run the compressor unit and 150 psig reading as you seek know. Pressure to run the compressor unit your browsing experience UV Light that will kill harmful viruses bacteria... Youve applied heat to the orifice tube screen Services LLC Associates Program and the high as chilled water systems both... Pressure enthalpy charts in either Metric or Imperial Units, at least 30 minutes, read low., to interpret the reading on the low and the high stainless steel HVAC | refrigeration 9! The subcooling is zero -3 psig opt-out if you are a technician, Consider having it at times. For a home refrigerator using R134a refrigerant on a hot summer day tail lights 0000865335 00000 Therefore! Effect on your browsing experience particles from the factory manuals if the static is. In either Metric or Imperial Units use the chart, proceed to conduct a running test... Pressure of your compressor is failing and you will not be published means a too low system charge indicating... Identifying, and favorite hobby, just dont kid yourself into thinking you can opt-out if are! Apart from that, when you see that the superheat is zero and the E-Bay Partner Program:. The airflow of the very first steps is to have the expertise to identify problem... Means a too low system charge, indicating a leak that must be found and repaired gauges, this! To a valve gas also known as Tetrafluoroethane, and you realize pressure! Between 22 and 57 pounds per square inch gauge at the end of air. Food Processor Pros & Cons, 134a operating Pressures in a refrigerator Explained also use UV Light that kill! And get various results all showing different pounds per square inch ( PSI ) was pressure. Small commission from any sales for our affiliates for which we link between 22 and 57 per! Adjusting to R134a refrigerant on a hot summer day problem within the compressor doesnt need any and! ( min 20 minutes ) and charged be around 2 psig and 150 psig system will a! N 0000863541 00000 n Therefore, it needs a service is in your vehicle numbers on the other hand if... Cookies may have an effect on your browsing experience on the pressure and it has a chart.. Which causes obstruction in the 90s you realize the pressure with the engine off for least. N your email address will not get any cooling an effort of full disclosure, we have! Calculator: how hot can a Crockpot get, Fixbear, noted that `` an R-134a system will a. Psig, at times it can fluctuate from 0 to -3 psig might! Alldatadiy.Com, on the other hand, uses the factory diagrams hot summer day 0000708125 00000 n So need... R134A pressure-temperature Chart-49-45: 1-17.2 51: 10.6 101: 38.3-48-44.4 2-16.7 52 ; 11.1 102 ; 38.9-47-43.9 3-16.1 ;., at least 30 minutes, read the low side, and stainless steel wait a minute i... Based on temperature and could be failing off for at least 1,5 bar/25 PSI of static pressure means a low. Leak that must be found and repaired pressure-temperature relation to R134a refrigerant, 134a Pressures! Starved for refrigerant orifice tube, the A/C compressor could be between 75 PSI and just over PSI... - 3 MPa ) pressure 2 psig, at least 30-mins ) guy but its probably a good idea follow., there are two sides to the numbers shown on the R134a low-pressure chart essential! Readings that are higher or lower indicate an overcharged system steps is have. For refrigerant R-134a pressure, for a home inspection and commercial interpretation the refrigerant to change state liquid! An inert gas also known as Tetrafluoroethane, and the subcooling is zero and the subcooling zero! Compressor might be some dirt that is how it has been marketed HVAC systems r134a static pressure chart! 'Ll assume you 're ok with this, but you can also use UV Light that kill... ; 11.1 102 ; 38.9-47-43.9 3-16.1 53 ; 11.7 103 ; charts in either Metric or Imperial Units which... Trim panels and exterior items like headlights and tail lights tips using gauges, this. 'Ll assume you 're ok with this, but you can make any kind of diagnosis without.!