PT chart · ASHRAE A1
R-22 PT Chart
R-22 pressure–temperature chart in psig and °F/°C. Older AC and heat pumps (phased out).
Vacuum readings are shown in inches of mercury (″ Hg) below atmospheric pressure.
Calculate superheat & subcooling with R-22
| °F | °C | Pressure, psig |
|---|---|---|
| -50 | -45.6 | 6.1″ Hg |
| -45 | -42.8 | 2.7″ Hg |
| -40 | -40.0 | 0.6 |
| -35 | -37.2 | 2.6 |
| -30 | -34.4 | 4.9 |
| -25 | -31.7 | 7.4 |
| -20 | -28.9 | 10.2 |
| -15 | -26.1 | 13.2 |
| -10 | -23.3 | 16.5 |
| -5 | -20.6 | 20.1 |
| 0 | -17.8 | 24.0 |
| 5 | -15.0 | 28.3 |
| 10 | -12.2 | 32.8 |
| 15 | -9.4 | 37.8 |
| 20 | -6.7 | 43.1 |
| 25 | -3.9 | 48.8 |
| 30 | -1.1 | 55.0 |
| 35 | 1.7 | 61.5 |
| 40 | 4.4 | 68.6 |
| 45 | 7.2 | 76.1 |
| 50 | 10.0 | 84.1 |
| 55 | 12.8 | 92.6 |
| 60 | 15.6 | 101.6 |
| 65 | 18.3 | 111.3 |
| 70 | 21.1 | 121.4 |
| 75 | 23.9 | 132.2 |
| 80 | 26.7 | 143.6 |
| 85 | 29.4 | 155.7 |
| 90 | 32.2 | 168.4 |
| 95 | 35.0 | 181.8 |
| 100 | 37.8 | 195.9 |
| 105 | 40.6 | 210.8 |
| 110 | 43.3 | 226.4 |
| 115 | 46.1 | 242.8 |
| 120 | 48.9 | 260.0 |
| 125 | 51.7 | 278.0 |
| 130 | 54.4 | 296.9 |
| 135 | 57.2 | 316.7 |
| 140 | 60.0 | 337.4 |
| 145 | 62.8 | 359.0 |
| 150 | 65.6 | 381.7 |
Source: Arkema Forane® Pressure Temperature Chart (PPC/SDC 05-2025). Reference only; verify against the equipment manufacturer's data.
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