PT chart · ASHRAE A1
R-407A PT Chart
R-407A pressure–temperature chart in psig and °F/°C. Low and medium-temp refrigeration.
R-407A 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 | 0.8″ Hg | 9.0″ Hg |
| -45 | -42.8 | 1.7 | 5.7″ Hg |
| -40 | -40.0 | 3.9 | 2.0″ Hg |
| -35 | -37.2 | 6.4 | 1.0 |
| -30 | -34.4 | 9.2 | 3.3 |
| -25 | -31.7 | 12.2 | 5.8 |
| -20 | -28.9 | 15.6 | 8.5 |
| -15 | -26.1 | 19.2 | 11.5 |
| -10 | -23.3 | 23.2 | 14.9 |
| -5 | -20.6 | 27.5 | 18.5 |
| 0 | -17.8 | 32.2 | 22.5 |
| 5 | -15.0 | 37.3 | 26.9 |
| 10 | -12.2 | 42.8 | 31.6 |
| 15 | -9.4 | 48.7 | 36.7 |
| 20 | -6.7 | 55.1 | 42.3 |
| 25 | -3.9 | 62.0 | 48.3 |
| 30 | -1.1 | 69.3 | 54.8 |
| 35 | 1.7 | 77.2 | 61.8 |
| 40 | 4.4 | 85.6 | 69.4 |
| 45 | 7.2 | 94.6 | 77.4 |
| 50 | 10.0 | 104.2 | 86.1 |
| 55 | 12.8 | 114.4 | 95.3 |
| 60 | 15.6 | 125.2 | 105.2 |
| 65 | 18.3 | 136.7 | 115.8 |
| 70 | 21.1 | 148.8 | 127.0 |
| 75 | 23.9 | 161.7 | 138.9 |
| 80 | 26.7 | 175.3 | 151.6 |
| 85 | 29.4 | 189.7 | 165.1 |
| 90 | 32.2 | 204.8 | 179.3 |
| 95 | 35.0 | 220.8 | 194.5 |
| 100 | 37.8 | 237.7 | 210.4 |
| 105 | 40.6 | 255.3 | 227.4 |
| 110 | 43.3 | 273.9 | 245.2 |
| 115 | 46.1 | 293.5 | 264.1 |
| 120 | 48.9 | 314.0 | 284.0 |
| 125 | 51.7 | 335.4 | 305.0 |
| 130 | 54.4 | 357.9 | 327.1 |
| 135 | 57.2 | 381.5 | 350.5 |
| 140 | 60.0 | 406.2 | 375.1 |
| 145 | 62.8 | 431.9 | 401.0 |
| 150 | 65.6 | 458.9 | 428.3 |
Source: Arkema Forane® Pressure-Temperature Wall Chart, Americas (2019). Reference only; verify against the equipment manufacturer's data.
The whole job, on your phone
HVAC Charge: Superheat & PT
Look up R-407A offline in the field and get superheat, subcooling and a charge call in seconds. See what's inside.