PT chart · ASHRAE A1
R-408A PT Chart
R-408A pressure–temperature chart in psig and °F/°C. Refrigeration (R-502 retrofit).
Vacuum readings are shown in inches of mercury (″ Hg) below atmospheric pressure.
| °F | °C | Pressure, psig |
|---|---|---|
| -50 | -45.6 | 1.4″ Hg |
| -45 | -42.8 | 1.3 |
| -40 | -40.0 | 3.5 |
| -35 | -37.2 | 5.8 |
| -30 | -34.4 | 8.5 |
| -25 | -31.7 | 11.3 |
| -20 | -28.9 | 14.5 |
| -15 | -26.1 | 17.9 |
| -10 | -23.3 | 21.7 |
| -5 | -20.6 | 25.7 |
| 0 | -17.8 | 30.1 |
| 5 | -15.0 | 34.9 |
| 10 | -12.2 | 40.0 |
| 15 | -9.4 | 45.5 |
| 20 | -6.7 | 51.5 |
| 25 | -3.9 | 57.8 |
| 30 | -1.1 | 64.6 |
| 35 | 1.7 | 71.9 |
| 40 | 4.4 | 79.7 |
| 45 | 7.2 | 88.0 |
| 50 | 10.0 | 96.8 |
| 55 | 12.8 | 106.2 |
| 60 | 15.6 | 116.1 |
| 65 | 18.3 | 126.7 |
| 70 | 21.1 | 137.8 |
| 75 | 23.9 | 149.6 |
| 80 | 26.7 | 162.1 |
| 85 | 29.4 | 175.3 |
| 90 | 32.2 | 189.2 |
| 95 | 35.0 | 203.8 |
| 100 | 37.8 | 219.2 |
| 105 | 40.6 | 235.3 |
| 110 | 43.3 | 252.3 |
| 115 | 46.1 | 270.2 |
| 120 | 48.9 | 288.9 |
| 125 | 51.7 | 308.6 |
| 130 | 54.4 | 329.2 |
| 135 | 57.2 | 350.7 |
| 140 | 60.0 | 373.3 |
| 145 | 62.8 | 397.0 |
| 150 | 65.6 | 421.7 |
Source: Arkema Forane® Pressure-Temperature Wall Chart, Americas (2019). Reference only; verify against the equipment manufacturer's data.
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