R-454B PT chart
Saturation pressures for R-454B from -40 °F to 130 °F (-40 °C to 54.4 °C), computed from reference equations of state[7]. Operating pressures run close to R-410A, slightly lower. The glide is small (about 1 to 1.5 °F): read the vapor column for superheat and the liquid column for subcooling.
| Temp (°F) | Liquid / bubble (psig) | Vapor / dew (psig) |
|---|---|---|
| -40 | 9.8 | 8.5 |
| -35 | 13.0 | 11.5 |
| -30 | 16.6 | 14.9 |
| -25 | 20.5 | 18.6 |
| -20 | 24.7 | 22.7 |
| -15 | 29.4 | 27.1 |
| -10 | 34.5 | 32.0 |
| -5 | 40.0 | 37.2 |
| 0 | 45.9 | 42.9 |
| 5 | 52.4 | 49.1 |
| 10 | 59.3 | 55.7 |
| 15 | 66.8 | 62.9 |
| 20 | 74.8 | 70.6 |
| 25 | 83.5 | 78.9 |
| 30 | 92.7 | 87.8 |
| 35 | 102.6 | 97.3 |
| 40 | 113.2 | 107.5 |
| 45 | 124.5 | 118.3 |
| 50 | 136.4 | 129.9 |
| 55 | 149.2 | 142.2 |
| 60 | 162.7 | 155.3 |
| 65 | 177.1 | 169.2 |
| 70 | 192.3 | 183.9 |
| 75 | 208.4 | 199.5 |
| 80 | 225.4 | 216.0 |
| 85 | 243.4 | 233.5 |
| 90 | 262.3 | 251.9 |
| 95 | 282.3 | 271.4 |
| 100 | 303.3 | 291.9 |
| 105 | 325.4 | 313.5 |
| 110 | 348.6 | 336.3 |
| 115 | 373.0 | 360.3 |
| 120 | 398.6 | 385.5 |
| 125 | 425.5 | 412.1 |
| 130 | 453.6 | 440.0 |
Use the vapor (dew) column to check superheat at the suction line. Use the liquid (bubble) column to check subcooling at the liquid line and for charging. R-454B has a small glide. Use dew for superheat and bubble for subcooling. R-454B values are computed, not transcribed; see Sources.
How to read it: measure suction pressure at the service port, find that pressure in the vapor column, and the temperature beside it is the saturation temperature. Suction line temperature minus saturation temperature is superheat. For subcooling, use the liquid column and liquid line pressure, then subtract the liquid line temperature from the saturation temperature.
About this data
Computed with CoolProp 8.0.0 predefined mixture models (Helmholtz-energy equations of state; Bell, Wronski, Quoilin, Lemort 2014, Ind. Eng. Chem. Res. 53(6), doi:10.1021/ie4033999).
Full R-454B reference: regulatory status, replacements, and equipment rated for it, on the R-454B page.
Updated