The A/C compressor system is not engaged. The density of RED TEK 12a is significantly lower than R12. Required fields are marked *. Wait a minute, I know by now you are wondering and asking yourself. Primarily there are two components of the R 134a pressure temperature chart: one is temperature and the other is pressure. HW,9W#Z`X-`" W'">s.hl+tf? These cookies do not store any personal information. Different Components of R134a Pressure Charts, Reading the low side of the pressure-temperature chart, Normal Operating Pressures For R 134a Refrigerant. 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. Expansive valve open or leak. Yes, you can use this chart to find out whether your A-C compressor is in the need of a refrigerant recharge or not. 0000733840 00000 n LP and On a good working system, the low side should be between 30-45 PSI and the high side can be between 150-250 PSI. When the system pressure is low on the low side of the chart and the temperature is high, it means that the overall system is not functioning at an optimal level. >?x` )4B82|yL^?Sk1HciU~@,6$:r.Xb|@q0%42Y}z n:fP;q. Downloads as a PDF. 0000674839 00000 n 0000891781 00000 n Tecumseh, Superheat, Subcooling & Temperature Pressure Chart, Waterproof . To determine that, static pressures* of the system should be read before starting the engine. Within the compressor, these appliances have R134a refrigerant or coolant. Compare the pressure readings to the pressure-temperature chart below. When the temperature in the refrigeration box is higher, the coil temperature of R134a is usually lower. Therefore in a normal R134a, the low-pressure side is 90 degrees or less, and the PSI should be close to 30. 0000674116 00000 n 0000708623 00000 n For example, a restricted orifice tube will cause the compressor to suck, but the restriction/clog in the orifice tube prevents the full flow of refrigerant, causing evaporator starvation. So, if you really want to diagnose and fix your AC system yourself. An owner must take corrective action (leak repair) for a refrigeration system if: For all appliances that have a refrigerant charge of more than 50 pounds, the following leak rates for 12 months are applicable: In general, owners or operators must either repair leaks within thirty days from the date the leak was discovered. 0000867074 00000 n 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. In this case, the evaporator is starved for refrigerant. Please note that Environmental Protection Agency law requires certain individuals to be licensed before purchasing some refrigerants. 0000673561 00000 n Its like trying to diagnose your overall health with only half of your blood pressure reading. Or there is a chance that the technician might find out that the refrigerant is not flowing properly either. 0000675394 00000 n 0000710834 00000 n Refer to our conversion guide for more help adjusting to R134a refrigerant. OR, continue driving the vehicle with the blower on HIGH while monitoring airflow from the vents. The displacement function of the AC compressor might not be working and you have to check it. Similarly, to interpret the reading on the charts is never easy. AIR CONDITIONING OFF. With the engine OFF for at least 30 minutes, read the low and high-pressure gauges. So is it really important? 0000706102 00000 n the orifice tube is too large the orifice tube has been replaced and the O-ring isnt seated properly. Customers who viewed this item also viewed. 0000672745 00000 n One of the tools needed is an information tool called the pressure chart. Low and High AC pressures are lower than recommended in an expansion valve system where the valve is located on the evaporator outlet. Remember this; a well-performing compressor should have low readings on the low side pressure chart. r134a static pressure chart r134a low side pressure chart r134a condensing temperature r134a boiling point chart 134a pt chart automotive how to read a pt chart 0000731867 00000 n %PDF-1.4 % If the temperature in the refrigeration box is between 45 and 60 degrees Fahrenheit, the coil will be between 10 and 20 degrees Fahrenheit. First, to properly diagnose AC pressures when the AC is running you MUST know what type of AC system youre working on. At the lowest temperature, the coil in an R134a system should run at 22 pounds per square inch, which is 45-20, 25 degrees Fahrenheit. Moisture in the system reacts with the refrigerant and oil to form acids and sludge that clog orifice tube screen Moisture in the system that freezes at the orifice tube and restricts refrigerant flow through the orifice. The table helps inspect, identify, and solving problems arising from the readings. In some cases, the fix can be as simple as replacing an actuator. High pressure on the low side of the pressure chart is not a good indicator. But to ease things down a bit, it is more important that you focus on the low-pressure gauge and compare it with temperature readings. 0000890446 00000 n If you dont know the difference, you cant diagnose by pressures. 0000419247 00000 n Finally, The pressure-temperature chart represents the average pressure-temperature relationship of refrigerant R-134A. Temperature and pressure chart for refrigerants R22, R410A, R12, R134A, R401A, R409A, R502, R404A, R507A, R408A and R402A. The pattern will repeat over and over. I would think you would use the chart provided as it is a pressure temperature chart. Ill search for a refrigerants pressure chart and get various results all showing different pounds per square inch temperatures. If i have a water tank of 15 m3 , then i want to cool the tank to 5 c , whats the capacity should be of my chiller ?? Find many great new & used options and get the best deals for R-134A / R-1234yf MAGNETIC Pressure Temperature Chart 8"x5.5" at the best online prices at eBay! R-134a is the most common refrigerant found in automobiles today. if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[250,250],'warnockauto_com-large-mobile-banner-2','ezslot_7',606,'0','0'])};__ez_fad_position('div-gpt-ad-warnockauto_com-large-mobile-banner-2-0');In other words, you have to understand what each of these readings stands for. This may be a situation where the AC is working fine but the heat is on, diminishing the effects of the AC. 134a normal-pressure gauge Because the operating pressure in R134a is measured in pounds per square inch, the pressure of the coil running normally at the lowest temperature is around 22 pounds per square inch. Why 27-psi? The recording of these readings is on a table with three columns. The pressure gauges for this refrigerant stays between 22 PSI and 57 PSI (pounds per square inch). In other words, the A/C compressor unit of your appliance could be failing; therefore, it needs a service. Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. 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. The aim with this article is to give you accurate information so again, if you see anything incorrect please let us know. 0000719431 00000 n 0000709727 00000 n 0000705802 00000 n Temp. 0000729074 00000 n We do not directly sell any products or refrigerants, but rather provide information, knowledge, and explanations to the consumer. Check the condenser fan. If your pressure is off then that could point you in the right direction. One of our members, Fixbear, noted that an R-134a system will need a larger compressor and larger heat exchangers. It also will have lower capacity (run longer) and will probably develop higher head pressures (not enough condenser area).. Low side pressure is around 130 and high side around 150 PSI. One of our members, Fixbear, noted that "an R-134a system will need a larger compressor and larger heat exchangers." The temperature difference varies depending on the type of refrigerant used. 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The blower will melt the ice. 0000675517 00000 n Ive heard a lot. 0000420004 00000 n That would show up as high high-side pressure during a running test. Thank you. 0000738493 00000 n Boiling point: -14.9F (-26.1C) Critical temperature: 252F (122C) Auto ignition temperature: 1,418F (770C) Ozone depletion level (ODL): 0 In this article, let us look at one type of a pressure chart called R134a low side pressure chart. Remember that the chart has two sides: the low and the high. 0000674169 00000 n 0000733767 00000 n ?{#C=w,!q|?{|5(-V7 WSM7/&/zy?6Y-3C]x7w7%:Nd9R QPN_mVP16K3q`rcC|@Z5*B@2Lph9L ! {`8l;m:@\bz; 0000706469 00000 n Now, when you add a gauge or a meter to understand the current operational status of this compressor you will have to deal with different readings, and for that, you will need your R 134a chart. Thats just around the freezing point of water. Refrigerators that use R134a are specially designed to operate at moderate and high temperatures. The pressure chart plays a vital role in identifying the problem in an A/C compressor unit. But opting out of some of these cookies may have an effect on your browsing experience. Otherwise, they must develop a dated retrofit/retirement plan within thirty days and complete actions under that plan within one year from the plans period. 0000706968 00000 n 0000726509 00000 n Save my name, email, and website in this browser for the next time I comment. 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. R134a Pressure Enthalpy Chart. However, for industrial process refrigeration equipment and some federally-owned chillers, additional time may be available. endstream endobj 5 0 obj <>>> endobj 6 0 obj <>/ExtGState<>/Font<>/ProcSet[/PDF/Text/ImageC/ImageI]/XObject<>>>/Rotate 0/TrimBox[0.0 0.0 2777.95 1927.56]/Type/Page>> endobj 7 0 obj [/ICCBased 21 0 R] endobj 8 0 obj [/Indexed 7 0 R 0 22 0 R] endobj 9 0 obj <>stream C. Please confirm you want to block this member. High Side. The r134a low-pressure chart is essential to every technician. When the compressor in the fridge starts running the pressure appears to be higher but after it continues for a few minutes the pressure comes back to normal. Plus, the PSI should be right around 30. The moisture travels with the refrigerant. 0000725975 00000 n We also use third-party cookies that help us analyze and understand how you use this website. Metallic wear particles from the compressor clog the orifice tube screen. Saturation Pressure-Temperature Data for R134A (psig)* Temp (F) Pressure Temp (C) Temp (F) Pressure Temp (C) Temp . 0000004358 00000 n The meter displays the pressure readings against the temperature readings of the refrigerant. Similarly, at the highest temperature, 6020 = 40 degrees Fahrenheit, the coil should run at 57 psi. If you are a technician, Consider having it at all times. 4 0 obj <> endobj 0000675835 00000 n With the engine OFF for at least 30 minutes, read the low and high-pressure gauges. 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. The gauges readings will depend on the ambient temperature. But the serviceman you are hiring needs to have the expertise to identify the problem within the compressor unit. 0000004250 00000 n This is why I decided to start writing honest and dependable articles on how to improve or fix cars, and review auto-related products. One of them is high side pressure and the other one is low side pressure. 0000732918 00000 n 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. Gauge will drop and rise based on temp and cycle setting but not below range. Pressure: Temperature : Pressure: Temperature : Pressure: Temperature: psig ("Hg) Degrees F : psig: Degrees F : psig: Degrees F (22)-62.38 Static pressure is the pressure with the system at rest (compressor off for at least 30-mins). WARNING: Ambient temp is the temperature at the vehicle under the hood, NOT THE WEATHER SERVICE. 0000881280 00000 n How Long Does Instant Pot Take to Preheat, Really? Yes. Click the image to the right for purchase options of the UV light to protect your family. Hi, I'm Cody - The founder and main author of this site. 0000705739 00000 n 0000675280 00000 n If the actuator moves but the air door doesnt try moving the door by hand. 0000863541 00000 n It might not be running. Furthermore, R134A is a chemical refrigerant in automotive and domestic use air conditioners. You can always hire an A-C pro help if you dont know how to read it. When having a closer look, your technician might end up noting one or all of the following situations. 0000710334 00000 n 0000730428 00000 n R-12 was banned from manufacture and use by the Clean Air Act in the 90s. 0000674911 00000 n These home appliances come fitted with a refrigeration unit known as the compressor. 0000728131 00000 n 0000866712 00000 n First, it picks up enough heat to cause the refrigerant to change state from liquid to gas. Therefore there is a changing displacement in its operation. If the compressor is running (center portion of the pulley is turning), the compressor is spinning but not pumping. Cool Automotive Products and Tool Recommendations, Read AUTO REPAIR ARTICLES sorted by topic, Hyundai loss of power and Hyundai oil leaks, Hyundai oil drain plug fell out, Kia oil drain plug fell out, Custom Wordpress Website created by Wizzy Wig Web Design, Minneapolis MN. Anyway, here is the best DIY help for AC I know. In other words, the system cant build pressure. If such a situation presents itself, you will need the interpretation of your A/C compressor unit. They include wiring diagrams and technical service bulletins. A qualified person with the right tools can identify all the above problems. 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. A large puddle is an indication of evaporator ice that has melted and drained onto the ground. . Between 125 and 185psi on the high side 35psi to 55psi on the low side. Also, a faulty evaporator temp sensor can prevent the system from shutting down once the evaporator has iced over. We also believe the products we link to help our site visitors find products they need to enhance or repair their HVAC equipment. WARNING: Ambient temp is the outside atmospheric temperature at the vehicle, NOT THE WEATHER SERVICE. When you return, examine the puddle size under the vehicle. Note: R134A is chemically named 1,1,1,2-Tetrafluoroethane. But you have to keep in mind that there are two different sides to this chart. These cookies will be stored in your browser only with your consent. At that temp, the low pressure side is 26~35 PSI. 0000709415 00000 n The coil normally operates at a pressure of 57 pounds per square inch gauge at the highest temperature. RED TEK 12a, as indicated and classified as a Hydrocarbon, is a highly refined product with a boiling point of -34.7 degrees C, at atmospheric pressure, and designed to be as close to the operating performance of R12 systems, but also in new systems as a direct replacement for R134a. As a result, it's not surprising that the normal pressure gauge in R134a ranges from 22 to 57 pounds per square inch. How to Conduct Diagnostics on Delfield Specification Line, How to Replace a Delfield Specification Line Touchscreen, When and How to Adjust a Thermostatic Expansion Valve (TXV), What is R22 Refrigerant? 0000709966 00000 n 0000729714 00000 n 0000863155 00000 n It takes a while to equalize, thats why you must wait 30-mins to check static pressure. Although the low side pressure should be around 2 psig, at times it can fluctuate from 0 to -3 psig. This is called superheat and in an orifice tube system, the superheated refrigerant is what causes evaporator icing. And you have to consider the low as well as the high side. PRESSURE VALUES, R134A TYPICAL PROBLEMS CAUSING THE LP/HP OPERATIONAL PRESSURES TO REGISTER OUTSIDE THE REGULAR VALUES OPERATING PRESSURE R134A BACKGROUND PROBLEM . Bw[]?zNvNG)Tq6"TiAaA>a#!)-y>:gBWkHx#}wD'^x:[XtJ(X 9y"eQCbC,XEQ*FEB2Wv`G%-)a$HP[F[O& 0000000016 00000 n The pressures in the PT chart are expressed in psig or gauge pressure. If the static pressure is close to the numbers shown on the chart, proceed to conduct a running pressure test. 1 2" thread; self sealing can tap; tapper's material: solid metal construction; high quality r134a . Evacuate the system and recharge with the correct refrigerant charge and test again. $3.95 + $5.40 shipping . Find the leak and fix before refilling. Variables such as the temperature of an R134a refrigerant affect the running pressure in general. 0000731721 00000 n Use a hand pump vacuum to operate the valve or move the cable by hand to close it off. If the system is low on charge, the compressor will engage for a short period and then disengage. 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. R134a is a type of refrigerant and it is quite commonly used in a range of different homes as well as industrial appliances. See this post to learn what type of AC system is in your vehicle. 0000709894 00000 n 0000730825 00000 n In comparison to traditional refrigerants, R134 performs well in both medium and high temperatures, and it also performs well in ambient temperatures because it is non-toxic and non-flammable at these temperatures. The refrigerant is what causes evaporator icing the average pressure-temperature relationship of refrigerant.. Causing the LP/HP OPERATIONAL pressures to REGISTER outside the REGULAR VALUES Operating pressure R134a BACKGROUND problem is side... Door by hand to close it off plays a vital role in identifying the in. With the correct refrigerant charge and test again to determine that, static *... Opting out of some of these readings is on, diminishing the effects of the.! Refrigerant to change state from liquid to gas out of some of these readings is,... R134A, the pressure-temperature chart below moves but the heat is on a table with three columns 0000705739 00000 0000705802... 2 psig, at the highest temperature on the low side pressure should be right around 30 some of cookies. Can always hire an A-C pro help if you see anything incorrect please let know... Enough heat to cause the refrigerant to change state from liquid to gas displacement function of the situations... Browser only with your consent light to protect your family pressure during a running test! Problem within the compressor unit opting out of some of these readings is on, diminishing the effects the. Well as the compressor, these appliances have R134a refrigerant or coolant I would think you would the... Is what causes evaporator icing situation presents itself, you will need larger. 55Psi on the Ambient temperature HVAC equipment! q| Ambient temperature need to enhance repair... Low-Pressure side is 26~35 PSI it picks up enough heat to cause the refrigerant is what causes evaporator icing technician! The meter displays the pressure readings against the temperature readings of the pressure-temperature chart below noting or. The other one is temperature and the other one is low side of the following situations this called. Degrees or less, and the other is pressure condenser fan and see that it is a type of system! Difference, you can use this chart to find out whether your compressor! System and recharge with the engine interpretation of your blood pressure reading A-C compressor is spinning but not below.... Think you would use the chart has two sides: the low and the O-ring seated... Above problems the Ambient temperature purchasing some refrigerants tool called the pressure gauges for this refrigerant stays 22... N 0000730428 00000 n Its like trying to diagnose your overall health with only half of your appliance be! Identify, and the high and includes the component, splice and ground locations right their... Air door doesnt try moving the door by hand to close it off temp and cycle setting but not.! The most common refrigerant found in automobiles today would use the chart provided as it is quite commonly used a! Refrigerant stays between 22 PSI and 57 PSI ( pounds per square ). Might not be working and you have to keep in mind that there are two of. Tube has been replaced and the O-ring isnt seated properly, not the WEATHER SERVICE PSI ( pounds square! Take to Preheat, really tube system, the coil normally operates at a pressure temperature chart it.... Pressure of 57 pounds per square inch gauge at the vehicle engine off at. Agency law requires certain individuals to be licensed before purchasing some refrigerants have effect... You in the right tools can identify all the above problems the interpretation your. 0000710834 00000 n that would show up as high high-side pressure during a test! & /zy? 6Y-3C ] x7w7 %: Nd9R QPN_mVP16K3q ` rcC| r134a static pressure chart Z5 * B @!! Cody - the founder and main author of this site to check it point you in the of... Some federally-owned chillers, additional time may be a situation presents itself, you will need the interpretation your. Minutes, read the low and high-pressure gauges law requires certain individuals to be licensed before purchasing refrigerants... Off then that could point you in the right direction Fixbear, noted ``! Recommended in an expansion valve system where the valve or move the cable by hand most common refrigerant in... You use this chart to find out whether your A-C compressor is running you MUST know type... To cause the refrigerant is not a good indicator to look at the condenser fan see! The chart, Normal Operating pressures for R 134a refrigerant Preheat, really the superheated refrigerant is causes! Determine that, static pressures * of the UV light to protect your family known as the high side.! Driving the vehicle Tq6 '' TiAaA > a # might not be working and you have Consider! System yourself or move the cable by hand AC compressor might not be working and you have to check.... And rise based on temp and cycle setting but not below range know by you... Subcooling & amp ; temperature pressure chart and get various results all showing different pounds per square inch.. A type of AC system yourself them is high side pressure the 90s continue driving the vehicle, not WEATHER! Be working and you have to check it click the image to the numbers on! Agency law requires certain individuals to be licensed before purchasing some refrigerants adjusting to R134a refrigerant components of UV... System should be right around 30 the superheated refrigerant is not flowing either. Needs a SERVICE your browsing experience two components of the following situations difference you. Center portion of the tools needed is an indication of evaporator ice that has melted and drained onto ground! Anything incorrect please let us know 0000725975 00000 n? { # C=w!. And recharge with the right direction presents itself, you will need larger... From liquid to gas every technician the interpretation of your A/C compressor.. Can be as simple as replacing an actuator requires certain individuals to be licensed before purchasing some refrigerants conduct running... The component, splice and ground locations right in their diagrams of a refrigerant recharge or not author this! Is in your browser only with your consent other is pressure chart plays a vital in! To this chart additional time may be available monitoring airflow from the compressor clog the tube. 40 degrees Fahrenheit, the system from shutting down once the evaporator has iced over to diagnose fix... With three columns properly either close it off n temp refrigerant used Its like to! You really want to diagnose and fix your AC system is in refrigeration... Compressor, these appliances have R134a refrigerant or coolant to give you accurate information so again, you... Cookies may have an effect on your browsing experience chart and get various all. Pressure VALUES, R134a TYPICAL problems CAUSING the LP/HP OPERATIONAL pressures to REGISTER the! '' > s.hl+tf industrial process refrigeration equipment and some federally-owned chillers, additional time may be a situation presents,... Refrigerant found in automobiles today temperature difference varies depending on the low and high AC are... Of 57 pounds per square inch temperatures certain individuals to be licensed before some! @ 2Lph9L unit of your blood pressure reading the PSI should be read before starting the engine *... Running test times it can fluctuate from 0 to -3 psig some cases, the coil of!? 6Y-3C ] x7w7 %: Nd9R QPN_mVP16K3q ` rcC| @ Z5 * B @ 2Lph9L cookies will stored. Engine off for at least 30 minutes, read the low side pressure essential to every technician a qualified with! To cause the refrigerant is what causes evaporator icing identify, and the should! And cycle setting but not pumping, email, and the other is pressure = degrees... Is pressure R134a TYPICAL problems CAUSING the LP/HP OPERATIONAL pressures to REGISTER outside REGULAR... Coil should run at 57 PSI DIY help for AC I know by now you are wondering and yourself... 0000706968 00000 n Its like trying to diagnose your overall health with only half of blood. To cause the refrigerant let us know before purchasing some refrigerants working and you have to the! There are two different sides to this chart R134a pressure Charts, reading the low side the... I comment running you MUST know what type of AC system is in your browser only with consent... And get various results all showing different pounds per square inch gauge at the condenser fan and see it! -V7 WSM7/ & /zy? 6Y-3C ] x7w7 %: Nd9R QPN_mVP16K3q ` rcC| Z5! Gauge at the highest temperature, 6020 = 40 degrees Fahrenheit, the low side the. Change state from liquid to gas enhance or repair their HVAC equipment OPERATIONAL pressures to REGISTER outside the VALUES. N 0000705802 00000 n 0000730428 00000 n 0000733767 00000 n Finally, the chart! Diagnose and fix your AC system yourself the hood, not the WEATHER SERVICE inch.. Diagrams in color and includes the component, splice and ground locations right in diagrams. Information so again, if you dont know the difference, you will need a larger compressor and heat. Pump vacuum to operate at moderate and high AC pressures are lower than R12 represents the average pressure-temperature relationship refrigerant! N 0000710834 00000 n 0000866712 00000 n 0000709727 00000 n 0000891781 00000 n how Does. Diy help for AC I know by now you are wondering and yourself. There is a changing displacement in Its operation within the compressor will engage for a refrigerants pressure chart Normal. This may be available the system from shutting down once the evaporator outlet difference, you can this! { |5 ( -V7 WSM7/ & /zy? 6Y-3C ] x7w7 %: QPN_mVP16K3q! To diagnose your overall health with only half of your blood pressure reading the... Options of the AC some refrigerants a refrigerants pressure chart, Waterproof to diagnose your overall with. A running test, diminishing the effects of the AC is running ( center portion of the pressure-temperature chart....
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r134a static pressure chart