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Refrigerant Pressure Temperature Chart | HVAC Refrigeration - This page offers a temperature-pressure relationship chart for use in working with HVAC Systems that use R-410A, R-22, and R-134A. Additional refrigeration information and resources are located below the chart. For more information and comprehensive articles on HVAC Refrigeration see our Refrigeration Category.
High Performance HVAC Refrigerant Pressure Temperature Chart
PT Chart for Common Refrigerants
| PSIG (Pounds per Square Inch Gauge) | Temperature °Fahrenheit | ||
|---|---|---|---|
| Refrigerant Type | |||
| R-410A (HFC) | R-22 (HCFC) | R-134A (HFC) | |
| -5 inches mercury | -66 | -48 | -22 |
| -4 inches mercury | -64 | -47 | -21 |
| -3 inches mercury | -63 | -45 | -19 |
| -2 inches mercury | -62 | -44 | -18 |
| -1 inches mercury | -61 | -43 | -16 |
| 0 | -60 | -41 | -15 |
| 1 | -59 | -39 | -12 |
| 2 | -58 | -37 | -10 |
| 3 | -55 | -34 | -8 |
| 4 | -54 | -32 | -5 |
| 5 | -52 | -30 | -3 |
| 6 | -50 | -28 | -1 |
| 7 | -48 | -26 | 1 |
| 8 | -46 | -24 | 3 |
| 9 | -44 | -22 | 5 |
| 10 | -42 | -20 | 7 |
| 11 | -40 | -19 | 8 |
| 12 | -39 | -17 | 10 |
| 13 | -38 | -15 | 12 |
| 14 | -36 | -14 | 13 |
| 15 | -34 | -12 | 15 |
| 16 | -33 | -11 | 16 |
| 17 | -32 | -9 | 18 |
| 18 | -30 | -8 | 19 |
| 19 | -29 | -7 | 21 |
| 20 | -28 | -5 | 22 |
| 21 | -27 | -4 | 24 |
| 22 | -26 | -3 | 25 |
| 23 | -25 | -1 | 26 |
| 24 | -24 | 0 | 27 |
| 25 | -22 | 1 | 29 |
| 26 | -20 | 2 | 30 |
| 27 | -19 | 4 | 31 |
| 28 | -18 | 5 | 32 |
| 29 | -17 | 6 | 33 |
| 30 | -16 | 7 | 35 |
| 31 | -15 | 8 | 36 |
| 32 | -14 | 9 | 37 |
| 33 | -13 | 10 | 38 |
| 34 | -12 | 11 | 39 |
| 35 | -11 | 12 | 40 |
| 36 | -10 | 13 | 41 |
| 37 | -9 | 14 | 42 |
| 38 | -8 | 15 | 43 |
| 39 | -7 | 16 | 44 |
| 40 | -6 | 17 | 45 |
| 42 | -4 | 19 | 46 |
| 44 | -3 | 21 | 48 |
| 46 | -2 | 23 | 50 |
| 48 | 0 | 24 | 51 |
| 50 | 1 | 26 | 52 |
| 52 | 3 | 28 | 54 |
| 54 | 4 | 29 | 56 |
| 56 | 6 | 31 | 57 |
| 58 | 7 | 32 | 59 |
| 60 | 8 | 34 | 60 |
| 62 | 10 | 35 | 64 |
| 64 | 11 | 37 | 65 |
| 66 | 13 | 38 | 66 |
| 68 | 14 | 40 | 68 |
| 70 | 15 | 41 | 69 |
| 72 | 16 | 42 | 71 |
| 74 | 17 | 44 | 72 |
| 76 | 19 | 45 | 73 |
| 78 | 20 | 46 | 75 |
| 80 | 21 | 48 | 76 |
| 85 | 24 | 51 | 79 |
| 90 | 26 | 54 | 82 |
| 95 | 29 | 56 | 85 |
| 100 | 32 | 59 | 88 |
| 105 | 34 | 62 | 90 |
| 110 | 36 | 64 | 94 |
| 115 | 39 | 67 | 96 |
| 120 | 41 | 69 | 98 |
| 125 | 43 | 72 | 100 |
| 130 | 45 | 74 | 103 |
| 135 | 47 | 76 | 105 |
| 140 | 49 | 78 | 107 |
| 145 | 51 | 81 | 109 |
| 150 | 53 | 83 | 112 |
| 155 | 55 | 85 | 114 |
| 160 | 57 | 87 | 116 |
| 165 | 58 | 89 | 118 |
| 170 | 60 | 91 | 120 |
| 175 | 62 | 92 | 122 |
| 180 | 64 | 94 | 123 |
| 185 | 66 | 96 | 125 |
| 190 | 67 | 98 | 127 |
| 200 | 70 | 100 | 129 |
| 205 | 72 | 102 | 131 |
| 210 | 73 | 103 | 132 |
| 220 | 76 | 104 | 134 |
| 230 | 79 | 108 | 137 |
| 240 | 82 | 114 | 140 |
| 250 | 84 | 117 | 143 |
| 260 | 87 | 120 | 146 |
| 275 | 90 | 124 | 149 |
| 290 | 93 | 128 | 153 |
| 305 | 97 | 132 | 157 |
| 320 | 99 | 136 | 162 |
| 335 | 104 | 139 | 166 |
| 350 | 107 | 143 | 171 |
| 365 | 109 | 146 | 174 |
| 380 | 114 | 149 | 177 |
| 405 | 118 | 182 | 182 |
| 500 | 134 | 202 | 202 |
| 600 | 149 | Off the Chart | Off the Chart |
Refrigerant Pressure Temperature Chart - PT Chart for R-410A, R-134A, and R-22
These are currently the three most widely used refrigerants on the market today for HVAC applications in residential and commercial use.
R-22 refrigerant is the king and used widely in the residential and commercial markets followed by R-134A which is used in commercial applications for chillers and in wide use in car air conditioning systems. R-134A replaced R-12 for automobile air conditioning systems. R-410A is currently being phased in for residential use as the phase period for R-22 draws nearer.
The pressure of the refrigerant corresponds with the temperature. Using a PT chart or pressure temperature chart one can determine the pressure or the temperature of the refrigerant. To properly charge an HVAC air conditioning or heat pump system one needs to use the PT chart or pressure temperature chart, a set of manifold gauges, and a thermometer or solid-state temperature sensing device.
Every set of manifold gauges in use today have the pressure-temperature chart or PT chart on the dials of the gauges so an HVAC technician need not carry a pressure-temperature chart or PT chart with them. The gauges used for R-22 differ slightly from the gauges used for R-410A as the pressures and temperatures are different for each type of system.
Metering Devices - Subcooling and Superheat - Refrigerant Oil
Depending on the type of metering device the HVAC technician will use either the superheat method, the subcooling method, or use a chart provided by the manufacturer of the equipment to ensure that the charge in the system is correct. If the unit is not a split system but a package unit then a weigh-in of refrigerant based on the manufacturer’s data can be done without using charts or the superheat or subcooling methods. The HVAC technician may decide to use these methods to double-check the charge for the weigh-in to be sure the charge is correct.
It is also important to note that the oil for R-410A and the oil for R-22 are different oils and precautions taken so that the oils do not mix. This is a good reason why an HVAC technician needs to carry two different types of gauges, one for R410A and one for R-22. This prevents cross-contamination of oils from an R-410A system to an R-22 system. The oil for R-134A is also different than the other oils used for R-22 and R-410A and it is important not to mix oils from other systems or systems with different refrigerants and oils.
High Performance HVAC: Refrigerant Pressure Temperature Chart Information for Air Conditioners and Heat Pump Systems
HVAC Refrigerant Pressure Temperature Chart
Technical Resource: Refrigeration and Air Conditioning Technology
Forgot to put 134A above.
https://highperformancehvac.com/r-134a-refrigerant-pressure-temperature-chart/
this info does you no good if you don’t know which side of the pressure gauge you’re supposed to read. I keep asking if you use the low or high side and nobody can answer that simple question,it only gives one psig on the chart. So which side do you cross reference from? I think it’s the low side but I forgot.
Sorry dude, if you don’t know how to read a PT Chart you really don’t know what you are doing. While refrigeration is not rocket science it does require some basic education along with a license in the most developed countries. To get the license requires basic education (knowledge) about refrigeration and the simplicity of reading a PT Chart (pressure-temperature in case you didn’t know). Besides, using a PT chart is only a small part of the job, you have to also know superheat/subcooling and some other things. Much of the information is available here on this site and many other sites on the net. Good luck!
You put in danger yourself and anyone around you if you attempt to use refrigeration tools and refrigerant when you have no even basic knowledge of refrigeration, and a license to work with refrigerants.
Why would you even think you are capable of working on a refrigeration system when you don’t even understand the gauges we use. I’ve worked in this industry since 1957 and over the years have picked up the pieces of refrigeration systems after people like you had their little fling at messing around with them.
You need both to diagnose the system. If everything is properly designed and working you can use the low side, because that is the side that will correspond to the evaporator (the part that gets cold). Get some books, study, make sure you have the proper license and recovery equipment and tanks, or don’t work on it though–refrigerants can be really bad for the environment; take the time to do it right! 🙂
Real constructive information
Thanks!!