R-410A pressure-temperature chart
Updated
Look up the R-410A saturation pressure for a temperature, or the saturation temperature for a gauge pressure. The full table follows.
Lookup
How to read the chart
Pressures are gauge pressure (psig) at sea level, which is absolute pressure minus 14.7 psi. R-410A has a small glide of about 0.2°F, so each temperature has a bubble pressure (liquid just starting to boil) and a slightly lower dew pressure (last liquid gone). Use the dew column on the suction side and the bubble column on the liquid side. Our superheat and subcooling calculator does that for you.
The lookup interpolates in a 1°F table, so results are accurate to about 0.1 psig or 0.1°F. The values were computed from the published equation of state for R-410A and match the Chemours chart, for example 118.8/118.4 psig at 40°F and 318.5/317.6 psig at 100°F.
Worked example
An evaporator coil running at a 40°F saturation temperature should show about 118 psig on the suction gauge. If the gauge reads 142.6 psig instead, the dew temperature is 50°F, so the coil is running 10°F warmer.
R-410A PT table (°F, psig)
| °F | Bubble (liquid) psig | Dew (vapor) psig |
|---|---|---|
| -40 | 10.8 | 10.7 |
| -38 | 12.1 | 12.0 |
| -36 | 13.4 | 13.3 |
| -34 | 14.8 | 14.7 |
| -32 | 16.3 | 16.2 |
| -30 | 17.8 | 17.7 |
| -28 | 19.4 | 19.3 |
| -26 | 21.0 | 20.9 |
| -24 | 22.7 | 22.6 |
| -22 | 24.5 | 24.4 |
| -20 | 26.3 | 26.2 |
| -18 | 28.2 | 28.1 |
| -16 | 30.2 | 30.0 |
| -14 | 32.2 | 32.0 |
| -12 | 34.3 | 34.1 |
| -10 | 36.5 | 36.3 |
| -8 | 38.7 | 38.5 |
| -6 | 41.0 | 40.8 |
| -4 | 43.4 | 43.2 |
| -2 | 45.9 | 45.7 |
| 0 | 48.4 | 48.2 |
| 2 | 51.1 | 50.8 |
| 4 | 53.8 | 53.5 |
| 6 | 56.6 | 56.3 |
| 8 | 59.5 | 59.2 |
| 10 | 62.4 | 62.2 |
| 12 | 65.5 | 65.2 |
| 14 | 68.6 | 68.4 |
| 16 | 71.9 | 71.6 |
| 18 | 75.2 | 74.9 |
| 20 | 78.7 | 78.4 |
| 22 | 82.2 | 81.9 |
| 24 | 85.8 | 85.5 |
| 26 | 89.6 | 89.2 |
| 28 | 93.4 | 93.1 |
| 30 | 97.4 | 97.0 |
| 32 | 101.4 | 101.1 |
| 34 | 105.6 | 105.2 |
| 36 | 109.9 | 109.5 |
| 38 | 114.3 | 113.9 |
| 40 | 118.8 | 118.4 |
| 42 | 123.4 | 123.0 |
| 44 | 128.2 | 127.7 |
| 46 | 133.0 | 132.6 |
| 48 | 138.0 | 137.5 |
| 50 | 143.1 | 142.6 |
| 52 | 148.4 | 147.9 |
| 54 | 153.8 | 153.2 |
| 56 | 159.3 | 158.7 |
| 58 | 164.9 | 164.4 |
| 60 | 170.7 | 170.1 |
| 62 | 176.6 | 176.0 |
| 64 | 182.7 | 182.1 |
| 66 | 188.9 | 188.3 |
| 68 | 195.2 | 194.6 |
| 70 | 201.7 | 201.1 |
| 72 | 208.4 | 207.7 |
| 74 | 215.2 | 214.5 |
| 76 | 222.1 | 221.4 |
| 78 | 229.2 | 228.5 |
| 80 | 236.5 | 235.7 |
| 82 | 243.9 | 243.2 |
| 84 | 251.5 | 250.7 |
| 86 | 259.3 | 258.5 |
| 88 | 267.2 | 266.4 |
| 90 | 275.3 | 274.5 |
| 92 | 283.6 | 282.7 |
| 94 | 292.1 | 291.2 |
| 96 | 300.7 | 299.8 |
| 98 | 309.5 | 308.6 |
| 100 | 318.5 | 317.6 |
| 102 | 327.7 | 326.7 |
| 104 | 337.1 | 336.1 |
| 106 | 346.7 | 345.7 |
| 108 | 356.5 | 355.4 |
| 110 | 366.5 | 365.4 |
| 112 | 376.6 | 375.5 |
| 114 | 387.0 | 385.9 |
| 116 | 397.6 | 396.5 |
| 118 | 408.4 | 407.3 |
| 120 | 419.5 | 418.3 |
| 122 | 430.7 | 429.6 |
| 124 | 442.2 | 441.0 |
| 126 | 453.9 | 452.7 |
| 128 | 465.9 | 464.7 |
| 130 | 478.0 | 476.8 |
| 132 | 490.5 | 489.3 |
| 134 | 503.1 | 501.9 |
| 136 | 516.0 | 514.9 |
| 138 | 529.2 | 528.0 |
| 140 | 542.6 | 541.5 |
| 142 | 556.3 | 555.2 |
| 144 | 570.3 | 569.2 |
| 146 | 584.5 | 583.5 |
| 148 | 599.1 | 598.1 |
| 150 | 613.9 | 613.0 |
Below about -60°F (not shown) the pressure is below atmospheric. Above 150°F you are approaching the 160°F critical point and the table no longer applies to normal operation.
Limits
This chart is for R-410A only. Do not use it for R-32 or R-454B, which run at different pressures. At high altitude, a gauge that reads psig shows less than these numbers for the same temperature, by roughly 0.5 psi per 1,000 feet.