PT chart · ASHRAE A1
R-449A PT Chart
R-449A pressure–temperature chart in psig and °F/°C. Low and medium-temp refrigeration (R-404A replacement).
R-449A 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 |
|---|---|---|---|
| -40 | -40.0 | 4.5 | 0.0 |
| -35 | -37.2 | 7.1 | 2.1 |
| -30 | -34.4 | 9.9 | 4.4 |
| -25 | -31.7 | 13.0 | 7.0 |
| -20 | -28.9 | 16.4 | 9.9 |
| -15 | -26.1 | 20.1 | 13.0 |
| -10 | -23.3 | 24.2 | 16.4 |
| -5 | -20.6 | 28.6 | 20.2 |
| 0 | -17.8 | 33.4 | 24.3 |
| 5 | -15.0 | 38.5 | 28.7 |
| 10 | -12.2 | 44.1 | 33.6 |
| 15 | -9.4 | 50.1 | 38.8 |
| 20 | -6.7 | 56.6 | 44.5 |
| 25 | -3.9 | 63.5 | 50.6 |
| 30 | -1.1 | 70.9 | 57.1 |
| 35 | 1.7 | 78.9 | 64.2 |
| 40 | 4.4 | 87.4 | 71.8 |
| 45 | 7.2 | 96.4 | 80.0 |
| 50 | 10.0 | 106.1 | 88.7 |
| 55 | 12.8 | 116.3 | 98.0 |
| 60 | 15.6 | 127.2 | 107.9 |
| 65 | 18.3 | 138.8 | 118.5 |
| 70 | 21.1 | 151.0 | 129.7 |
| 75 | 23.9 | 163.9 | 141.7 |
| 80 | 26.7 | 177.6 | 154.3 |
| 85 | 29.4 | 192.0 | 167.8 |
| 90 | 32.2 | 207.2 | 182.0 |
| 95 | 35.0 | 223.2 | 197.1 |
| 100 | 37.8 | 240.1 | 213.1 |
| 105 | 40.6 | 257.8 | 229.9 |
| 110 | 43.3 | 276.4 | 247.7 |
| 115 | 46.1 | 295.9 | 266.5 |
| 120 | 48.9 | 316.3 | 286.3 |
| 125 | 51.7 | 337.8 | 307.2 |
| 130 | 54.4 | 360.2 | 329.2 |
| 135 | 57.2 | 383.7 | 352.4 |
| 140 | 60.0 | 408.3 | 376.8 |
| 145 | 62.8 | 433.9 | 402.5 |
| 150 | 65.6 | 460.7 | 429.7 |
Source: Arkema Forane® Pressure Temperature Chart (PPC/SDC 05-2025). Reference only; verify against the equipment manufacturer's data.
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