R-410A pressure-temperature chart
R-410A saturation pressures from -40 °F to 150 °F, in gauge pressure (psig). Enter any temperature or pressure in the tool above to get the other, corrected for your elevation. At 40 °F, R-410A saturates at 118.4 psig; at 105 °F, 341.9 psig (liquid).
R-410A PT chart (psig, every 5 °F)
| °F | °C | Liquid (bubble) psig | Vapor (dew) psig |
|---|---|---|---|
| -40 | -40.0 | 10.8 | 10.7 |
| -35 | -37.2 | 14.1 | 14.0 |
| -30 | -34.4 | 17.8 | 17.7 |
| -25 | -31.7 | 21.9 | 21.8 |
| -20 | -28.9 | 26.3 | 26.2 |
| -15 | -26.1 | 31.2 | 31.0 |
| -10 | -23.3 | 36.5 | 36.3 |
| -5 | -20.6 | 42.2 | 42.0 |
| 0 | -17.8 | 48.4 | 48.2 |
| 5 | -15.0 | 55.2 | 54.9 |
| 10 | -12.2 | 62.4 | 62.2 |
| 15 | -9.4 | 70.3 | 70.0 |
| 20 | -6.7 | 78.7 | 78.4 |
| 25 | -3.9 | 87.7 | 87.4 |
| 30 | -1.1 | 97.4 | 97.0 |
| 35 | 1.7 | 107.7 | 107.3 |
| 40 | 4.4 | 118.8 | 118.4 |
| 45 | 7.2 | 130.6 | 130.1 |
| 50 | 10.0 | 143.2 | 142.6 |
| 55 | 12.8 | 156.5 | 156.0 |
| 60 | 15.6 | 170.7 | 170.1 |
| 65 | 18.3 | 185.8 | 185.1 |
| 70 | 21.1 | 201.8 | 201.1 |
| 75 | 23.9 | 218.7 | 217.9 |
| 80 | 26.7 | 236.5 | 235.8 |
| 85 | 29.4 | 255.4 | 254.6 |
| 90 | 32.2 | 275.4 | 274.5 |
| 95 | 35.0 | 296.4 | 295.5 |
| 100 | 37.8 | 318.5 | 317.6 |
| 105 | 40.6 | 341.9 | 340.9 |
| 110 | 43.3 | 366.4 | 365.4 |
| 115 | 46.1 | 392.3 | 391.2 |
| 120 | 48.9 | 419.4 | 418.3 |
| 125 | 51.7 | 447.9 | 446.8 |
| 130 | 54.4 | 477.9 | 476.8 |
| 135 | 57.2 | 509.4 | 508.3 |
| 140 | 60.0 | 542.5 | 541.4 |
| 145 | 62.8 | 577.3 | 576.3 |
| 150 | 65.6 | 613.9 | 613.0 |
Need a reading between rows, or your elevation corrected? Use the tool above: type a temperature or a pressure and it fills in the other.
About R-410A
R-410A is a near-azeotropic blend of R-32 and R-125 (50/50 by weight), the standard refrigerant in US residential air conditioning and heat pumps for well over a decade. Its glide is a fraction of a degree, so the liquid and vapor columns are nearly identical. It runs at much higher pressure than R-22: at 40 °F, about 118 psig against 69 psig.
New residential AC and heat pump systems are moving to lower-GWP refrigerants, mainly R-454B and R-32, under EPA's Technology Transitions rule. Existing R-410A systems can still be serviced with R-410A, so you will see it on service calls for years.
How to read a PT chart
A pressure-temperature chart gives the saturation temperature: the temperature at which the refrigerant boils or condenses at a given pressure. Inside the evaporator and condenser, where liquid and vapor are both present, pressure and temperature are locked together, so one gauge reading tells you the other.
- Find your pressure on the chart (or type it into the tool) and read the saturation temperature next to it.
- Superheat = suction line temperature − saturation temperature at suction pressure. Use the superheat calculator.
- Subcooling = saturation temperature at liquid line pressure − liquid line temperature. Use the subcooling calculator.
- Gauges read psig, pressure above the air around you. Charts are built for sea level (14.696 psi). At 5,000 ft your gauge reads about 2.5 psi high against the chart; enter your elevation in the tool and it corrects for it.
Liquid and vapor columns: temperature glide
R-410A is a blend whose components boil at slightly different temperatures, so at the same pressure it starts boiling (the bubble point, liquid column) a little colder than it finishes condensing (the dew point, vapor column). That difference is the glide. Use the vapor (dew) value for superheat and the liquid (bubble) value for subcooling. The tool does this for you.
Working on refrigerant circuits?
Opening the refrigerant circuit on stationary equipment using the refrigerants on this page requires EPA Section 608 certification, and suppliers can only sell you most refrigerants if you have it. See how to get EPA 608 certified or take the free EPA 608 practice tests.
Where the numbers come from
Saturation pressures for R-410A: Arkema, Forane 410A thermodynamic properties (generated with NIST REFPROP 9.0). Converted to gauge pressure at sea level (psig = psia − 14.696); below 0 psig the chart shows inches of mercury of vacuum. Values are for pure refrigerant: air, moisture or a mixed charge will throw readings off. The equipment manufacturer's charging chart and data plate govern.
FAQ
What should R-410A pressures be?
It depends on the temperatures. On a typical cooling day the evaporator runs near 40 °F saturation, which is about 118 psig on the suction side, and the condenser runs 15 to 30 °F above outdoor air temperature, which is roughly 342 psig at 105 °F. Use superheat and subcooling, not pressure alone, to judge the charge.
What is the R-410A pressure at 40 degrees?
118.4 psig (vapor) and 118.8 psig (liquid) at sea level.
What is R-410A pressure at 100 degrees?
318.5 psig (liquid) and 317.6 psig (vapor) at sea level.
Is this tool free?
Yes. No account, no email, no download. It runs in your browser and works on your phone at the unit.