R134A PT chart is a standard table. Basically, this 134A PT chart tells you what is the pressure of R134A refrigerant at certain temperatures. The charts start at the low end (-49°F) and tell you the pressures all the way to the high end (150°F).
Example: What is the pressure of 134A freon at 85°F? You just chart the chart (found below) and you will see that at 85°F, the pressure of R134A is 95.2 psig (pounds per square inch gauge).
The pressures in the PT chart are expressed in psig or gauge pressure. That’s very practical; we always use a pressure gauge meter when measuring the pressure in refrigerant lines.
Note: R134A is chemically named 1,1,1,2-Tetrafluoroethane. For on-site use, we include a printable R134A PT chart in PDF form at the end of the article.
To help everybody out, we have explained some examples about what is the 134A pressure on 75°F, 80°F, 90°F, and 100°F days below the PT chart for R134A. It’s quite useful to check that out if you find the chart a bit confusing.
Here is the full R134A PT table:
134A Pressure Temperature Chart
| Temperature (°F): | Temperature (°C): | Pressure (psig): |
| -49°F | -45.0°C | 18.4 psig |
| -48°F | -44.4°C | 18.0 psig |
| -47°F | -43.9°C | 17.6 psig |
| -46°F | -43.3°C | 17.3 psig |
| -45°F | -42.8°C | 16.9 psig |
| -44°F | -42.2°C | 16.5 psig |
| -43°F | -41.7°C | 16.1 psig |
| -42°F | -41.1°C | 15.7 psig |
| -41°F | -40.6°C | 15.2 psig |
| -40°F | -40.0°C | 14.8 psig |
| -39°F | -39.4°C | 14.4 psig |
| -38°F | -38.9°C | 13.9 psig |
| -37°F | -38.3°C | 13.4 psig |
| -36°F | -37.8°C | 13.0 psig |
| -35°F | -37.2°C | 12.5 psig |
| -34°F | -36.7°C | 12.0 psig |
| -33°F | -36.1°C | 11.4 psig |
| -32°F | -35.6°C | 10.9 psig |
| -31°F | -35.0°C | 10.4 psig |
| -30°F | -34.4°C | 9.8 psig |
| -29°F | -33.9°C | 9.3 psig |
| -28°F | -33.3°C | 8.7 psig |
| -27°F | -32.8°C | 8.1 psig |
| -26°F | -32.2°C | 7.5 psig |
| -25°F | -31.7°C | 6.9 psig |
| -24°F | -31.1°C | 6.3 psig |
| -23°F | -30.6°C | 5.7 psig |
| -22°F | -30.0°C | 5.0 psig |
| -21°F | -29.4°C | 4.3 psig |
| -20°F | -28.9°C | 3.7 psig |
| -19°F | -28.3°C | 3.0 psig |
| -18°F | -27.8°C | 2.3 psig |
| -17°F | -27.2°C | 1.5 psig |
| -16°F | -26.7°C | 0.8 psig |
| -15°F | -26.1°C | 0.1 psig |
| -14°F | -25.6°C | 0.4 psig |
| -13°F | -25.0°C | 0.7 psig |
| -12°F | -24.4°C | 1.1 psig |
| -11°F | -23.9°C | 1.5 psig |
| -10°F | -23.3°C | 1.9 psig |
| -9°F | -22.8°C | 2.4 psig |
| -8°F | -22.2°C | 2.8 psig |
| -7°F | -21.7°C | 3.2 psig |
| -6°F | -21.1°C | 3.6 psig |
| -5°F | -20.6°C | 4.1 psig |
| -4°F | -20.0°C | 4.6 psig |
| -3°F | -19.4°C | 5.0 psig |
| -2°F | -18.9°C | 5.5 psig |
| -1°F | -18.3°C | 6.0 psig |
| 0°F | -17.8°C | 6.5 psig |
| 1°F | -17.2°C | 7.0 psig |
| 2°F | -16.7°C | 7.5 psig |
| 3°F | -16.1°C | 8.0 psig |
| 4°F | -15.6°C | 8.5 psig |
| 5°F | -15.0°C | 9.1 psig |
| 6°F | -14.4°C | 9.6 psig |
| 7°F | -13.9°C | 10.2 psig |
| 8°F | -13.3°C | 10.8 psig |
| 9°F | -12.8°C | 11.3 psig |
| 10°F | -12.2°C | 11.9 psig |
| 11°F | -11.7°C | 12.5 psig |
| 12°F | -11.1°C | 13.1 psig |
| 13°F | -10.6°C | 13.8 psig |
| 14°F | -10.0°C | 14.4 psig |
| 15°F | -9.4°C | 15.0 psig |
| 16°F | -8.9°C | 15.7 psig |
| 17°F | -8.3°C | 16.4 psig |
| 18°F | -7.8°C | 17.0 psig |
| 19°F | -7.2°C | 17.7 psig |
| 20°F | -6.7°C | 18.4 psig |
| 21°F | -6.1°C | 19.1 psig |
| 22°F | -5.6°C | 19.9 psig |
| 23°F | -5.0°C | 20.6 psig |
| 24°F | -4.4°C | 21.3 psig |
| 25°F | -3.9°C | 22.1 psig |
| 26°F | -3.3°C | 22.9 psig |
| 27°F | -2.8°C | 23.7 psig |
| 28°F | -2.2°C | 24.5 psig |
| 29°F | -1.7°C | 25.3 psig |
| 30°F | -1.1°C | 26.1 psig |
| 31°F | -0.6°C | 26.9 psig |
| 32°F | 0°C | 27.8 psig |
| 33°F | 0.6°C | 28.6 psig |
| 34°F | 1.1°C | 29.5 psig |
| 35°F | 1.7°C | 30.4 psig |
| 36°F | 2.2°C | 31.3 psig |
| 37°F | 2.8°C | 32.2 psig |
| 38°F | 3.3°C | 33.1 psig |
| 39°F | 3.9°C | 34.1 psig |
| 40°F | 4.4°C | 35.0 psig |
| 41°F | 5.0°C | 36.0 psig |
| 42°F | 5.6°C | 37.0 psig |
| 43°F | 6.1°C | 38.0 psig |
| 44°F | 6.7°C | 39.0 psig |
| 45°F | 7.2°C | 40.1 psig |
| 46°F | 7.8°C | 41.1 psig |
| 47°F | 8.3°C | 42.2 psig |
| 48°F | 8.9°C | 43.2 psig |
| 49°F | 9.4°C | 44.3 psig |
| 50°F | 10.0°C | 45.4 psig |
| 51°F | 10.6°C | 46.6 psig |
| 52°F | 11.1°C | 47.7 psig |
| 53°F | 11.7°C | 48.9 psig |
| 54°F | 12.2°C | 50.0 psig |
| 55°F | 12.8°C | 51.2 psig |
| 56°F | 13.3°C | 52.4 psig |
| 57°F | 13.9°C | 53.6 psig |
| 58°F | 14.4°C | 54.9 psig |
| 59°F | 15.0°C | 56.1 psig |
| 60°F | 15.6°C | 57.4 psig |
| 61°F | 16.1°C | 58.7 psig |
| 62°F | 16.7°C | 60.0 psig |
| 63°F | 17.2°C | 61.3 psig |
| 64°F | 17.8°C | 62.7 psig |
| 65°F | 18.3°C | 64.0 psig |
| 66°F | 18.9°C | 65.4 psig |
| 67°F | 19.4°C | 66.8 psig |
| 68°F | 20.0°C | 68.2 psig |
| 69°F | 20.6°C | 69.7 psig |
| 70°F | 21.1°C | 71.1 psig |
| 71°F | 21.7°C | 72.6 psig |
| 72°F | 22.2°C | 74.1 psig |
| 73°F | 22.8°C | 75.6 psig |
| 74°F | 23.3°C | 77.1 psig |
| 75°F | 23.9°C | 78.7 psig |
| 76°F | 24.4°C | 80.2 psig |
| 77°F | 25.0°C | 81.8 psig |
| 78°F | 25.6°C | 83.4 psig |
| 79°F | 26.1°C | 85.0 psig |
| 80°F | 26.7°C | 86.7 psig |
| 81°F | 27.2°C | 88.4 psig |
| 82°F | 27.8°C | 90.0 psig |
| 83°F | 28.3°C | 91.8 psig |
| 84°F | 29.4°C | 93.5 psig |
| 85°F | 30.0°C | 95.2 psig |
| 86°F | 30.6°C | 97.0 psig |
| 87°F | 31.1°C | 98.8 psig |
| 88°F | 31.7°C | 100.6 psig |
| 89°F | 31.7°C | 102.5 psig |
| 90°F | 32.2°C | 104.3 psig |
| 91°F | 32.8°C | 106.2 psig |
| 92°F | 33.3°C | 108.1 psig |
| 93°F | 33.9°C | 110.0 psig |
| 94°F | 34.4°C | 112.0 psig |
| 95°F | 35.0°C | 114.0 psig |
| 96°F | 35.6°C | 115.9 psig |
| 97°F | 36.1°C | 118.0 psig |
| 98°F | 36.7°C | 120.0 psig |
| 99°F | 37.2°C | 122.1 psig |
| 100°F | 37.8°C | 124.2 psig |
| 105°F | 40.6°C | 135.0 psig |
| 110°F | 43.3°C | 146.4 psig |
| 115°F | 46.1°C | 158.4 psig |
| 120°F | 48.9°C | 171.2 psig |
| 125°F | 51.7°C | 184.6 psig |
| 130°F | 54.4°C | 198.7 psig |
| 135°F | 57.2°C | 213.6 psig |
| 140°F | 60.0°C | 229.2 psig |
| 145°F | 62.8°C | 245.7 psig |
| 150°F | 65.6°C | 262.9 psig |
Here are some examples of how to read this chart:
What Is The Pressure Of R134A On 75 Degree Day?
You simply check the table above and see that the pressure of R134A on a 75-degree day is 78.7 psig.
What Is The Pressure Of R134A On 80 Degree Day?
You simply check the table above and see that the pressure of R134A on a 80-degree day is 86.7 psig.
What Is The Pressure Of R134A On 90 Degree Day?
You simply check the table above and see that the pressure of R134A on a 90-degree day is 104.3 psig.
What Is The Pressure Of R134A On 100 Degree Day?
You simply check the table above and see that the pressure of R134A on a 100-degree day is 124.2 psig.
R134A PT Chart PDF (Printable PDF For On-Site Use)
As promised, you can get the printable PDF version of the R134A PT chart here if you need it on-site:
All in all, you can now figure out what psi pressure does a 134A refrigerant have at all temperatures. You can check similar tables for:
Thank you for this chart. So that I can fallow the standard pressure for every temperature that I need. For repairing any kind of refrigeration using 134a prion.