PT chart · ASHRAE A1
R-452A PT Chart
R-452A pressure–temperature chart in psig and °F/°C. Transport refrigeration (R-404A replacement).
R-452A 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 |
|---|---|---|---|
| -45 | -42.8 | 3.2 | 0.3 |
| -40 | -40.0 | 5.7 | 2.4 |
| -35 | -37.2 | 8.3 | 4.7 |
| -30 | -34.4 | 11.3 | 7.3 |
| -25 | -31.7 | 14.6 | 10.1 |
| -20 | -28.9 | 18.1 | 13.2 |
| -15 | -26.1 | 22.0 | 16.7 |
| -10 | -23.3 | 26.2 | 20.4 |
| -5 | -20.6 | 30.8 | 24.5 |
| 0 | -17.8 | 35.7 | 28.9 |
| 5 | -15.0 | 41.1 | 33.7 |
| 10 | -12.2 | 46.9 | 38.8 |
| 15 | -9.4 | 53.1 | 44.4 |
| 20 | -6.7 | 59.8 | 50.5 |
| 25 | -3.9 | 66.9 | 57.0 |
| 30 | -1.1 | 74.6 | 64.0 |
| 35 | 1.7 | 82.8 | 71.4 |
| 40 | 4.4 | 91.5 | 79.4 |
| 45 | 7.2 | 100.9 | 88.0 |
| 50 | 10.0 | 110.8 | 97.1 |
| 55 | 12.8 | 121.3 | 106.9 |
| 60 | 15.6 | 132.4 | 117.3 |
| 65 | 18.3 | 144.3 | 128.3 |
| 70 | 21.1 | 156.8 | 140.0 |
| 75 | 23.9 | 170.0 | 152.4 |
| 80 | 26.7 | 183.9 | 165.6 |
| 85 | 29.4 | 198.6 | 179.5 |
| 90 | 32.2 | 214.1 | 194.3 |
| 95 | 35.0 | 230.4 | 209.9 |
| 100 | 37.8 | 247.6 | 226.4 |
| 105 | 40.6 | 265.6 | 243.7 |
| 110 | 43.3 | 284.5 | 262.1 |
| 115 | 46.1 | 304.3 | 281.4 |
| 120 | 48.9 | 325.1 | 301.8 |
| 125 | 51.7 | 346.8 | 323.3 |
| 130 | 54.4 | 369.6 | 345.9 |
| 135 | 57.2 | 393.4 | 369.8 |
| 140 | 60.0 | 418.3 | 395.0 |
| 145 | 62.8 | 444.2 | 421.6 |
| 150 | 65.6 | 471.3 | 449.8 |
Source: Arkema Forane® Pressure Temperature Chart (PPC/SDC 05-2025). Reference only; verify against the equipment manufacturer's data.
The whole job, on your phone
HVAC Charge: Superheat & PT
Look up R-452A offline in the field and get superheat, subcooling and a charge call in seconds. See what's inside.