Refrigerator R134a Low Side Pressure Chart

at -25°C evaporating roughly 55 % of R 134a or 45 % of R 12. Find the corresponding saturated pressure for your refrigerant. In a properly changed and functioning system the high pressure is the condensing temp of the refrigerant, and the low side is the boiling temp, Nothing more or nothing less. If you own a refrigerator built after 1995 chances are it uses 134a coolant. Using an R134A gauge set (or an R12 set with conversion), connect the red line to the high-side, blue line to the low-side, the yellow line to the vacuum pump. 3 kPa (700 mmHg, 27. *Make sure the condenser fan comes on when the readings are being checked. Nowadays, most refrigerant cans on the market come with an implemented gauge. P2 is discharge pressure, commonly called head pressure. Pressure at low side after running AC for awhile was about 33psi -- high side read 190psi. R-134A Refrigerant Pressure Temperature Chart - R-134A is an inert gas also known as Tetrafluoroethane, and for air conditioner systems. low side limit switch must shorted. Source: ACProCold. Last time I loaded refrigerant until working pressures on the r12 scale of ~250 on the high side, and ~55psi on the low side. The following must be documented at time of installation. There is currently serious consideration of replacing it with R744 (Carbon Dioxide) in refrigeration and heat pump applications. The first step in recharging your system is to locate the low side service port (or low-pressure port). So this is low side, this is high side and then this is the vapor side. SECTION 2—LOW-AMBIENT GUIDELINE This guideline is for 38TN split-system products only. The recommended pressure for a home refrigerator using R134A refrigerant is between 2 psig and 150 psig. When designing a SLHX, the refrigerant pressure drop is a major parameter to consider. Do not mix refrigerant types through a system or in the same container; mixing of refrigerants will. 08 degree F at the standard barometric pressure, and if the evaporator temperature is below 0 degree F, the pressure in the evaporator will be still well above the vacuum Thus the refrigerant R134a can be used for the low temperature applications also. Refrigerant R-404A is the baseline refrigerant in this study. The 2 ports on the system are the low-pressure and the high-pressure side. WARNING: Always use HFC-134a for A/C refrigerant. The charts on the back of R134a recharge kits that are available in auto parts stores indicate a car’s low side pressure should be, for instance, 45-55 psi when the outside ambient temp is 85degF. , 1" Face Dial Size. solution was to jumper the low side switch to keep the compressor running - low side reading of about 20psi - add 1. I know how to read the guages and a r134 pressure temperature chart. low side limit switch must shorted. Plugged drier or strainer 12. How Air Conditioning Works in a Car Refrigeration Cycle Any automotive air conditioning system employs four basic parts-a mechanical compressor, driven by the vehicle's engine; an expansion valve, which is a restriction the compressor pumps against; and two heat exchangers, the evaporator and the condenser. These ports are found on the passenger side of the engine compartment in most cases. This is the first in a series of advanced basic articles on the refrigeration cycle. System pressure testing Measuring the pressures in the high and low pressure circuits is the best way to test an air conditioning system. Read honest and unbiased product reviews from our users. Compressors only have two valves, and refrigerant flows in only one direction. Higher low side pressures make for a unsafe AC system. Using a PT chart or pressure temperature chart one can determine the pressure or the temperature of the refrigerant. R134a Refrigerant Pressure Temperature Calculator. [3] Attempts at phasing out its use as a refrigerant with substances that have lower global warming potential, such as HFO-1234yf , are underway. NOT FOR USE IN AMMONIA SYSTEMS! This is our coldest refrigerant we have for automotive use in hot climates with high humidity. Same as #11 above b. R-134A Refrigerant Pressure Temperature Chart - R-134A is an inert gas also known as Tetrafluoroethane, and for air conditioner systems. Evaporator oil logged 6. Having said that, here’s the scoop on system pressures in residential refrigerators running R-134a refrigerant: Low Side: About 2 psig, although I’ve seen these systems pull a slight vacuum, 0 to -3 psig, when down to temperature, meaning the freezer is at 0℉. NU-22 - 120° condensing / 40° evaporator approx. With those readings taken with the A/C system operating at oustide temperature of 85F(29C), what do the readings indicate? A. The pressure-enthalpy chart, as shown in Fig. Design changes to the condenser and evaporator need to be done to use this refrigerant. b) The gas then flows to the condenser, here the gas condenses to a liquid, and gives off its heat to the outside air. Troubleshooting each type of refrigerant is different, so these examples of refrigerant pressures will be mostly used for R-22 ac service and repair. Condensing tends to make it even hotter, but the idea is to cool it down; in this case we are using water. Each refrigerant has it's own chart which is a graph of the Enthalpy of a refrigerant during various pressures and physical states. The drop in low side and raise in high side should happen fairly quickly, say 10 seconds. Psia is absolute pressure, which means it is gauge pressure + 14. Close the low side coupler valve and disconnect the low side hose from the A/C system. The following must be documented at time of installation. I slowly added refrigerant till the low side was around 3-4 psi. RED TEK® 12a as indicated and classified as a HC, is a highly refined product with a boiling point of -34. Source: ACProCold. 3 kPa (700 mmHg, 27. TEV seat leak 3. Long or small line d. To use the HVAC Technical Support AC Pressure Temperature Chart, Turn unit on; monitor system running approximately 15 to 30 minutes. The first step in recharging your system is to locate the low side service port (or low-pressure port). • R-134a box at 35°F, forced draft, single circuit – 65% liquid, 35% vapor enters the coil – Coil is about 20 degrees colder than the box – Pressure is 18. A/C R12 to R134a Low/High Side Retrofit Conversion Adapter Fitting Cap Valve US R-134A System Pressure MAGNETIC Chart | Ac Pro For Ac Pressure Chart For 134A. I put a new cap tube and filter drier. r134a pressure chart low side When the R134a pressure is low, the R134a. as the pump to keep the refrigerant circulating and to increase the refrigerant’s pressure. 3) the optimum charge of R12 alternative refrigerant R600a (45g ) ,R290 (70 g) and R134a(60g) 4) with optimum charge the suction pressure of R134a is 1. Propane is compressed by the compressor into the hot side or high pressure side tubing. R513A (Opteon TM XP10) is suitable in new systems as well as for retrofit of existing systems.   The 300 psi pressure you mention indicate a restriction in the. I bought the R-134a refrigerant over the counter at an auto parts store. Low pressure connection: 1/4 SAE. Observe that the high side includes refrigerant in all the 3 conditions listed above. If you do it, definately keep an eye on your high pressure side while filling it. Never introduce another refrigerant into the R134a equipment. The Original poster has probably put in so much refrigerant that the system went solid on the high side, or nearly so (verbal shorthand for completely liquid filled - no room for gas. Summary-When the R134a pressure is low, the R134a temperature is low. Refrigerant-134a has a different molecular structure and requires a large capacity condenser. High side pressures can skyrocket for any number of reasons without there being something wrong with the system. I know how to read the guages and a r134 pressure temperature chart. Steady rev the engine and you should see the low side drop low enough to cycle. Each refrigerant has it's own chart which is a graph of the Enthalpy of a refrigerant during various pressures and physical states. European regulations begin to phase out use of R-134a in mobile air conditioning in 2011, and eliminate its use in all new vehicles by 2017. Low pressure should be in the 25 psi area and not above 45 psi. as the pump to keep the refrigerant circulating and to increase the refrigerant’s pressure. Sanden AC Compressor: R134a Important Information. brickmason on Thu August 11, 2005 10:00 PM. Refrigerator Temperature 34º to 39ºF 1º to 4ºC 1º to 4ºC Low Side Pressure (cut-in) 5 to 12 psig 34 to 83 kPa 5 to 12 psig 34 to 83 kPa Low Side Pressure (cut-out) -2 to 2 psig-14 to 14 kPa-2 to 2 psig-14 to 14 kPa High Side Pressure (Last 1/3 of cycle) 90 to 115 psig 621 to 793 kPa 130 to 155 psig 896 to 1069 kPa. Air too cold d. Low pressure connection: 1/4 SAE. Charging the system with a refrigerant charging kit can take between 5 to 10 minutes depending on the system capacity. This setup can be used to recharge any system with a Danfoss compressor. Saturation temperatures and corresponding pres-sures are always the same for a particular refriger-ant. Thread valve onto top of can in clockwise direction. Quitting smoking now greatly reduces serious risk to your health. I bought a can of A/C Refrigerant Refill (R134a) with the refill dispenser/gauge, but I'm a little stuck on whether I need to actually refill my refrigerant. Remove low side dust cap. I bought the R-134a refrigerant over the counter at an auto parts store. The other item you would not be able to do if needed, is to run a vacuum and pressure test on the system. On a low-carb diet an elevated blood pressure tends to improve (normalize). r134a pressure chart low side When the R134a pressure is low, the R134a. 2 The fridge is recharged via a valve mounted at the end of a short stub on the suction side, clearly identified by the green shrink-fit tubing. ™ the temperature of the liquid refrigerant leaving the condenser. Last update to this page: April 30, 2002April 30, 2002. How to Check the Refrigerant Charge in R134a Fridge or Freezer Systems Information supplied courtesy of www. Systems using R-407C may have a higher system pressure drop than with R-22. a) Refrigerant comes into the compressor as a low- pressure gas, it is compressed and then moves out of the compressor as a high- pressure gas. So an R-134a system should be around 40# SST. According to the U. Start the engine and turn the AC on. The pressure chart is a guideline for approximate pressures to expect at various ambient temps if you are not doing a complete service. I plan to vac it down and recharge it but I want to find out if adding refrigerant fixes it first. Vapor blasted magnetic tips. HVAC: Common Refrigerant Pressures? I graduate from a Heating and Cooling course in 2 weeks. The charts on the back of R134a recharge kits that are available in auto parts stores indicate a car’s low side pressure should be, for instance, 45-55 psi when the outside ambient temp is 85degF. With your A/C on high and fan on high the target pressure depends upon ambient temperature. If it was a restriction, there should be high subcooling. Generally it will have a blue or a black cap (Do not connect to high-pressure side. Low pressure connection: 1/4 SAE. Check all hoses. Diagrams: System Pressure Chart Get a quick look at what an average A/C system looks like, along with the compressor manufacturer and what the specific R-134a requirements are for your car. --- Install new R-134a adhesive label over original R-12 label on radiator support. * Normal readings on high and low side with AC OFF (static pressure) – Depends on outside temperature, but normally is between 80-105 PSI * Normal low side reading with AC on high-speed and MAX & engine at 800-1000 RPM’s – Ranges from 25-35 PSI – Note that on. 5 MPG CAFE Standard. Also, what was the reason for adding R134a (which actually isn't Freon) in the first place?. Partially charge the system, and check for leaks (see Refrigerant Leak Test. How do I know how much R-134a refrigerant to add? R-134a System pressure chart. He added two cans of freon (r-134a I'm sure) and a third can the next day when the low pressure side was still lower than expected. ; Blue Gauge (low. Leak test compressor. Check all hoses. Sanden AC Compressor: R134a Important Information. Plugged drier or strainer 12. Southport Nc Tide Chart. If it was a restriction, there should be high subcooling. Low Side Pressure-2 to 6 psig ( -14 to 41 kPa) Refrigerator Frigidaire. I know how to read the guages and a r134 pressure temperature chart. 2 The fridge is recharged via a valve mounted at the end of a short stub on the suction side, clearly identified by the green shrink-fit tubing. Why and How to Use HVAC Gauge Manifolds Apr. It has much lower operating and standing pressures as compared to R-22. R-134a System Pressure Chart. The compressor takes low pressure, gaseous, r-134a, compresses it (which creates heat), then sends it to the condenser, where the heat is dissipated to the outside. Move across the columns horizontally to find the pressure. The other item you would not be able to do if needed, is to run a vacuum and pressure test on the system. Cheap pressure gauge, Buy Quality pressure temperature gauge directly from China pressure pump water Suppliers: 1. R134a is a HFC, used in automotive air conditioning and as a replacement for R12 and R22 in medium and high temperature refrigeration applications, such as commercial and domestic refrigeration and chillers. Now switch here. In the case of R134a in a low temp unit (refrigerator), yes it runs at less than zero pressure, just slightly less. : Includes air conditioning low side pressure chart on can Colder air 50 percent. You can recharge any R134a commercial refrigeration system, COOLERS, FREEZERS, ETC. Low Side Pressure: Cut-in = 6 to 13 Cut-out = -2 to +2 High Side Pressure: 105 - 115 Wattage: 150 - 220. r-134a temperature pressure chart for expansion valve system— engine and ac running Ambient Temperature °F/°C Low-Pressure Gauge High-Pressure Gauge 60°F Low side pressure 7-15 psi High side pressure 120-170 psi. NOTE! Refrigerant and oil capacity guides are based on data provided by sources such as AllData and Mitchell. What is the suction pressure of an R-134 in a low temperature deep freezer? Assuming that the evaporator tubing is going to be running about ten degrees F colder than the air in the freezer, and that the air temperature will be around minus ten de. For single refrigerants such as R22 and R134A, the isothermal line has no gradient in the saturated area, that is, the saturation temperature under certain pressure is the same at both the liquid side and the gas side. operating pressure, the more challenging it will become to find low GWP, nonflammable refrigerant options. REFRIGERANT TEMPERATURE-PRESSURE CHART -- MOSTLY COMPUTER GENERATED FROM NIST REFPROP V5. The low side pressure is approx 9 PSIG. Yes - it is possible to overcharge the system - especially using a gage that only monitors the low side pressure. Once a system has been converted to R-421A. Do NOT overcharge! Do NOT exceed 60 psi on low pressure port. Connect it to the low pressure port. The high usually runs between 150-200 but systems vary so these numbers are only guidelines. Psig is equal to psis at sea level (14. I'm going to pick up some braze in ports and see if I can get me a torch. Nonflammable alternative blends. Shop with confidence. In the case of R134a in a low temp unit (refrigerator), yes it runs at less than zero pressure, just slightly less. Is there any recommendation on location for low side and high side valves?. If you own a refrigerator built after 1995 chances are it uses 134a coolant. NO!! R134a pressures will NOT be the same as R12 pressures. We offer therapeutic products for the prevention and treatment of bed sores: alternating pressure mattress and accessories, medical mattresses, low air loss mattress systems, alternating pressure pads, lateral rotation mattress systems, therapeutic foam mattresses and gel mattress overlays, static air, and water overlays. A refrigerator moves refrigerant from a high-pressure area to a low-pressure area. I'm going to pick up some braze in ports and see if I can get me a torch. The low side gauge indicates both pressure (psi) and vacuum (in/hg). DESIGN OF CENTRIFUGAL CHILLER USING HFO-1233zd(E) Equipment was designed to improve efficiency and make chillers more compact. my system was not open, Didn’t have a leak, what would the pressure reading on the hi side. The low side pressure is approx 9 PSIG. Generally it will have a blue or a black cap (Do not connect to high-pressure side.   The 300 psi pressure you mention indicate a restriction in the. Last time I loaded refrigerant until working pressures on the r12 scale of ~250 on the high side, and ~55psi on the low side. The first large difference between R 600a and R 134a or R 12, is found in the pressure level, which is lower, e. Open Valve stem to raise piercing pin. The compressor takes low pressure, gaseous, r-134a, compresses it (which creates heat), then sends it to the condenser, where the heat is dissipated to the outside. R-134a Refrigerant Check Gauge. As to gauge readings, the 400psi that the other fellow mentioned is not out of the ball park. Find a store. Plugged drier or strainer 12. Steady rev the engine and you should see the low side drop low enough to cycle. R-134a cylinders are colored light blue. Manifold air conditioning gauges are employed to check on the pressure of the refrigerant. Poor refrigerant distribution 4. With systems using R-134a refrigerant, the high-side pressure usually will equate to 2. Using a PT chart or pressure temperature chart one can determine the pressure or the temperature of the refrigerant. The 255 ton system delivers refrigerant superheated vapor at 40 degrees F to the compressor. It is a 134a system. Norepinephrine is a naturally occurring chemical in the body that acts as both a stress. • Low Cost Availability There is no refrigerant that matches all of the requirements, which means we have a range to choose from. R-134a System Pressure Chart. If your ports are located in the compressor, the low side is marked by an "S" and the high side by an "H". Thread valve onto top of can in clockwise direction. Filling is done through the low side. Low pressure connection: 1/4 SAE. The pressure in the condenser is high, so the refrigerant readily changes state to a liquid. R134a Low Side Pressure Chart , Guide to Ac Pressor Pressure Readings, 6 Mon Questions About Ac Gauges Freon Gauges, Pressure Temperature Chart 134a Pressure Chart Templates World In, Understanding Hot Gas bypass. Hardened chrome vanadium shafts. 2, displays all the pertinent properties for a given refrigerant (in this example R22). operating pressure, the more challenging it will become to find low GWP, nonflammable refrigerant options. Restricted or capped external equalizer 10. 7 kPa) low-side pressure. R134a is a HFC, used in automotive air conditioning and as a replacement for R12 and R22 in medium and high temperature refrigeration applications, such as commercial and domestic refrigeration and chillers. : Includes air conditioning low side pressure chart on can Colder air 50 percent. High and low side pressure readings on home AC R-22 refrigerant I would like to find out the normal operating range of pressure (high and low side) on a fully charged R-22 (york) home air conditioning system; also, the unit is a 4 ton unit, what is the total freon capacity in the system. In the case of R134a in a low temp unit (refrigerator), yes it runs at less than zero pressure, just slightly less. 404a Pt Chart Elegant R134a Refrigerant Pressure Temperature Chart, 134a Pt Chart Kivanllowriverwebsites. The refrigerant is now a high temperature, high pressure va‐ por. Psig is equal to psis at sea level (14. Ensure there is anti-freezein AUTOMOTIVE AIR CONDITIONING An automotive air conditioner is a system which cools and dehumidifies the interior of a car, bus or truck smoothness 5. All you need is a can of R-134a with a gauge and you're set. Low pressure drop across valve a. Measure the pressure at the discharge service valve. NO!! R134a pressures will NOT be the same as R12 pressures. The table below shows the comparison between temperature and pressure for R134a. I would pull the charge and put in the right amount. The air conditioner service people say the refrigerant is full and there are no leaks. 2 The fridge is recharged via a valve mounted at the end of a short stub on the suction side, clearly identified by the green shrink-fit tubing. At low mass flux, e. Since it only holds a few ounces, and R-134a is relatively benign, and cheap as dirt. “What is the HP/LP of a freezer which uses R 134 as a refrigerant?” Unfortunately for you, dear studi; As with almost all of refrigeration engineering, there's no pat answer to assessing what your high side and low side pressures should be using R. Find a store. I did use the manifold gauges and measured the high and low pressure at 2000rpm. Unfortunately, I did not take high side pressure readings, so I do not know the subcooling. Your system is low on Freon. Charging the system with a refrigerant charging kit can take between 5 to 10 minutes depending on the system capacity. With your A/C on high and fan on high the target pressure depends upon ambient temperature. The 255 ton system delivers refrigerant superheated vapor at 40 degrees F to the compressor. Leak in system 2. , 1" Face Dial Size. Filled the low pressure side pipe (the larger of the two) by first installing a tap or bullet piercing valve: Then attach the hose end with the piercing needle to a 12-16oz R134a refrigerant (freon). 6% higher energy consumption for XP-10 when integrated over a representative load. If it does not go below zero, you have a sizeable leak and will need to correct it before you continue. When the charge in the system is correct according to the conditions described in Section 1, remove the Charging Hose from the suction side service valve while the system is running. Pressure at low side after running AC for awhile was about 33psi -- high side read 190psi. 3 kPa (700 mmHg, 27. A/C Pro Port. The first large difference between R 600a and R 134a or R 12, is found in the pressure level, which is lower, e. On a low-carb diet an elevated blood pressure tends to improve (normalize). Note: R134a has a Global Warming Potential (GWP) of 1300 with respect to Carbon Dioxide. It can be used for recharging refrigerant, or to diagnose an a/c system based on pressure readings from your gauges. R134A AC Air Condition Adjustable Quick Connector Adapter High/Low Pressure $10. C02 equivalent global warming potential. above can be obtained by measuring pressure and temperature of refrigerant at a certain point. Although not shown, I usually boil a plastic container of water in the microwave and partially submerge the can of r134a refrigerant in the water during the recharge procedure. For high-glide blends, however, the desired coil temperature is the average (or midpoint) temperature of the coil. Also the 'correct' pressure reading varies with temperature. What is the correct low side pressure on an R12 refrigerator? This refrigerator is about 10 yrs old. It's been 4-5 years since I've done a 308 A/C system & I don't have my reference docs available right now. That chart is not universal. Engine on and a/c running on max cooling - High side 175, Low side 25 to 28 (the compressor is drawing down ok on low side when it cycles). Check the performance charts of the compressor for the maximum suction pressure. A/C R134a pressures too high. Even today, the conversion from R12 to R134a is still an ongoing topic in the area of classic and modern classic cars as well as in several non-EU countries. Low side pressure Typical: ~ 30 psi High side pres-sure Typical: 2. a) Refrigerant comes into the compressor as a low- pressure gas, it is compressed and then moves out of the compressor as a high- pressure gas. Side-By-Side question Search Fixya Press enter to search. at the condenser outlet. The effect of suction-line heat exchangers was investigated for a dual-cycle system using refrigerant R-134a in both cycles. The pressure-enthalpy chart, as shown in Fig. Established in 1980's, Kangpusi Refrigeration now brings you high quality r134a hermetic rotary small refrigeration compressor, r410a hermetic rotary small refrigeration compressor, r134a rotary refrigerator compressor. Charging the system with a refrigerant charging kit can take between 5 to 10 minutes depending on the system capacity. Here at On-Time Appliance we use the large 30# cans but this is not piratical for the average person who owns a refrigerator. ZeroR Refrigerant is lightweight. 3 kPa (700 mmHg, 27. The (TXV) metering device converts high pressure liquid into little low pressure liquid droplets that change from a liquid to a vapor as they receive heat from the air passing through the evaporator core. CHECKING A/C SYSTEM PRESSURE CHARGING/ADDING REFRIGERANT AMBIENT TEMPERATURE PRESSURE GAUGE CHART* CAUTION: Always wear protective gloves and eye wear. Clean Air Act. Pressure - Temperature Chart All pressures shown are in PSIG; Red print = Vacuum (inches of Mercury) °F1222502 134a 401A 401B 402A 404A 408A 409A 410A. Do not attempt to adapt the unit for another refrigerant. NO!! R134a pressures will NOT be the same as R12 pressures. Because R134a runs at a higher pressure than SO2, a restrictor should be installed in the low side line. Low side pressure should ideally be in the 28-38 psi range. Check all hoses. Your AC works by compressing the refrigerant and letting it expand thru a small orfice. R-134a cans are under pressure. Undersized. This setup can be used to recharge any system with a Danfoss compressor. Also the 'correct' pressure reading varies with temperature. This is the liquid side. This pressure relates to the refrigerated box's highest temperature. Filling is done through the low side. You should be fine. Previous post Next post. Modular Products Inc. How well does the system work?. Air too cold d. R134a in HIGH-PRESSURE side is HOT and the cooler ambient air moving over the condenser can absorb the heat from it. 8) For overcharged or leaking systems, evacuate into a suitable container and restart charging procedure. (The use of braze taps is highly recommended to prevent leaks, especially on the discharge side. R513A (Opteon TM XP10) is suitable in new systems as well as for retrofit of existing systems. When the weather heats up I will recheck the pressures and system performance. 3 lbs I believe) his low side pressure still wasn't changed. • 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 you're driving AND you've ruled out a low refrigerant charge or bad orifice tube/expansion valve. So this is low side, this is high side and then this is the vapor side. ictworkshopsolutions. Use recovery equipment designated only for R134a. Side-By-Side What Are Typical 134A Manifold Gauge Pressures ? | eHow. Industries, commercial businesses, property owners, and others looking for an R-22 replacement to maintain their air conditioning (AC) systems can turn to Freon™ NU-22B™ refrigerant. 3) Cp of R600a much higher than R134a. PRESSURE TEMPERATURE CHART HFC-134A REFRIGERATION PRESSURE TEMPERATURE CHART 404A. Pressure at low side after running AC for awhile was about 33psi -- high side read 190psi. 5) Change the blower motor speed to low and continue to watch the low side pressure. Complete the charging via the low/suction side of the Follow common practices for confirming refrigerant charge via system operating pressures and amperage draw: High and low pressure should be per a pressure temperature chart for R290 Amperage draw should be within. 99 2pcs Straight Column Refrigerant Joint Quick Coupler Connectors R134A Adapter $12. R134a Pressure Gauge Chart This chart details how ambient temperature correlates with the system refrigerant charge pressure, and how it affects high and low side psi readings. The first heat exchange that occurs in this basic refrigeration cycle is the evaporator. chart for 134A. Guidelines for Charging Freon™ 134a UV Into the AC System. Higher ambient temps means higher low side pressures. Psig is equal to psia – 14. R134a TEMPERATURE PRESSURE CHART Ambient Temperature (˚F) Low Side Gauge High Side Gauge. R-134a Recharge hoses will only fit on the low pressure service port on all R-134a vehicles. More or less charge will not make it blow. Refrigerant R134a or HFC-134a is a commercially available hydrofluorocarbon (HFC) refrigerant for use as a long-term replacement for R-12 in new equipment and for retrofitting medium temperature CFC-12 systems. TEV seat leak 3. However, medium pressure alternatives provide more of a challenge (Figure 4). Refrigerator Temperature 34º to 39ºF 1º to 4ºC 1º to 4ºC Low Side Pressure (cut-in) 5 to 12 psig 34 to 83 kPa 5 to 12 psig 34 to 83 kPa Low Side Pressure (cut-out) -2 to 2 psig-14 to 14 kPa-2 to 2 psig-14 to 14 kPa High Side Pressure (Last 1/3 of cycle) 90 to 115 psig 621 to 793 kPa 130 to 155 psig 896 to 1069 kPa.