PT chart · ASHRAE A1
R-407C PT Chart
R-407C pressure–temperature chart in psig and °F/°C. AC and heat pumps (R-22 replacement).
R-407C is a zeotropic blend with temperature glide, so the chart has two columns: use the vapor (dew) column for superheat and the liquid (bubble) column for subcooling.
Vacuum readings are shown in inches of mercury (″ Hg) below atmospheric pressure.
| °F | °C | Liquid (bubble), psig | Vapor (dew), psig |
|---|---|---|---|
| -50 | -45.6 | 2.7″ Hg | 11.0″ Hg |
| -45 | -42.8 | 0.6 | 8.0″ Hg |
| -40 | -40.0 | 2.7 | 4.6″ Hg |
| -35 | -37.2 | 5.1 | 0.9″ Hg |
| -30 | -34.4 | 7.7 | 1.6 |
| -25 | -31.7 | 10.6 | 3.9 |
| -20 | -28.9 | 13.7 | 6.5 |
| -15 | -26.1 | 17.2 | 9.3 |
| -10 | -23.3 | 20.9 | 12.3 |
| -5 | -20.6 | 25.0 | 15.7 |
| 0 | -17.8 | 29.5 | 19.4 |
| 5 | -15.0 | 34.3 | 23.5 |
| 10 | -12.2 | 39.5 | 27.9 |
| 15 | -9.4 | 45.2 | 32.7 |
| 20 | -6.7 | 51.2 | 37.9 |
| 25 | -3.9 | 57.7 | 43.5 |
| 30 | -1.1 | 64.7 | 49.6 |
| 35 | 1.7 | 72.2 | 56.1 |
| 40 | 4.4 | 80.2 | 63.2 |
| 45 | 7.2 | 88.8 | 70.7 |
| 50 | 10.0 | 97.9 | 78.8 |
| 55 | 12.8 | 107.6 | 87.5 |
| 60 | 15.6 | 118.0 | 96.8 |
| 65 | 18.3 | 128.9 | 106.7 |
| 70 | 21.1 | 140.5 | 117.3 |
| 75 | 23.9 | 152.8 | 128.6 |
| 80 | 26.7 | 165.8 | 140.5 |
| 85 | 29.4 | 179.6 | 153.2 |
| 90 | 32.2 | 194.1 | 166.7 |
| 95 | 35.0 | 209.4 | 181.0 |
| 100 | 37.8 | 225.5 | 196.1 |
| 105 | 40.6 | 242.4 | 212.1 |
| 110 | 43.3 | 260.3 | 229.0 |
| 115 | 46.1 | 279.0 | 246.9 |
| 120 | 48.9 | 298.6 | 265.8 |
| 125 | 51.7 | 319.2 | 285.7 |
| 130 | 54.4 | 340.7 | 306.7 |
| 135 | 57.2 | 363.3 | 328.8 |
| 140 | 60.0 | 387.0 | 352.1 |
| 145 | 62.8 | 411.7 | 376.6 |
| 150 | 65.6 | 437.5 | 402.5 |
Source: Arkema Forane® Pressure Temperature Chart (PPC/SDC 05-2025). Reference only; verify against the equipment manufacturer's data.
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