R-407C PT chart
Saturation pressures for R-407C from -40 °F upward, computed from reference equations of state[6]. R-407C has one of the larger glides in common use, about 8 to 10 °F, so the bubble and dew columns differ by roughly 13 psi at box temperatures. Charging and subcooling use bubble, and superheat uses dew.
| Temp (°F) | Liquid / bubble (psig) | Vapor / dew (psig) |
|---|---|---|
| -40 | 2.7 | -2.3 |
| -35 | 5.1 | -0.4 |
| -30 | 7.7 | 1.6 |
| -25 | 10.6 | 3.9 |
| -20 | 13.7 | 6.5 |
| -15 | 17.2 | 9.3 |
| -10 | 20.9 | 12.3 |
| -5 | 25.0 | 15.7 |
| 0 | 29.5 | 19.4 |
| 5 | 34.3 | 23.5 |
| 10 | 39.5 | 27.9 |
| 15 | 45.2 | 32.7 |
| 20 | 51.2 | 37.9 |
| 25 | 57.7 | 43.5 |
| 30 | 64.7 | 49.6 |
| 35 | 72.2 | 56.1 |
| 40 | 80.2 | 63.2 |
| 45 | 88.8 | 70.7 |
| 50 | 97.9 | 78.8 |
| 55 | 107.6 | 87.5 |
| 60 | 117.9 | 96.8 |
| 65 | 128.9 | 106.7 |
| 70 | 140.5 | 117.3 |
| 75 | 152.8 | 128.5 |
| 80 | 165.8 | 140.5 |
| 85 | 179.6 | 153.2 |
| 90 | 194.1 | 166.7 |
| 95 | 209.4 | 181.0 |
| 100 | 225.5 | 196.1 |
| 105 | 242.4 | 212.1 |
| 110 | 260.3 | 229.0 |
| 115 | 279.0 | 246.9 |
| 120 | 298.6 | 265.8 |
| 125 | 319.2 | 285.7 |
| 130 | 340.7 | 306.6 |
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-407C glide is about 8 to 10 °F. Using the wrong column misstates superheat by several degrees. R-407C 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-407C reference: regulatory status, replacements, and equipment rated for it, on the R-407C page.
Updated