For superheat and subcooling calculations in HVAC systems
This pressure-temperature chart shows the relationship between pressure and saturation temperature for R407C refrigerant. Use this chart to calculate superheat and subcooling when troubleshooting or commissioning HVAC systems.
Superheat = Actual temperature - Saturation temperature (at suction pressure)
Subcooling = Saturation temperature (at liquid pressure) - Actual temperature
R407C is a zeotropic blend with significant temperature glide (approximately 9-11°F or 5-6°C). This means:
This chart provides both dew point and bubble point temperatures for accurate calculations.
| Lower Temperature Range | Higher Temperature Range | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Temperature °F |
Temperature °C |
Bubble Pressure PSIG (Liquid) |
Dew Pressure PSIG (Vapor) |
Bubble Pressure kPa (Liquid) |
Dew Pressure kPa (Vapor) |
Temperature °F |
Temperature °C |
Bubble Pressure PSIG (Liquid) |
Dew Pressure PSIG (Vapor) |
Bubble Pressure kPa (Liquid) |
Dew Pressure kPa (Vapor) |
| -40 | -40.0 | 4.1 | 1.3 | 28.3 | 9.0 | 60 | 15.6 | 125.0 | 107.2 | 861.8 | 739.1 |
| -35 | -37.2 | 6.6 | 3.6 | 45.5 | 24.8 | 65 | 18.3 | 139.5 | 120.6 | 961.8 | 831.5 |
| -30 | -34.4 | 9.4 | 6.2 | 64.8 | 42.7 | 70 | 21.1 | 155.2 | 135.0 | 1070.1 | 931.1 |
| -25 | -31.7 | 12.7 | 9.1 | 87.5 | 62.7 | 75 | 23.9 | 172.0 | 150.5 | 1186.3 | 1037.5 |
| -20 | -28.9 | 16.4 | 12.5 | 113.0 | 86.2 | 80 | 26.7 | 190.1 | 167.3 | 1311.0 | 1153.6 |
| -15 | -26.1 | 20.6 | 16.3 | 142.0 | 112.3 | 85 | 29.4 | 209.4 | 185.2 | 1443.6 | 1277.1 |
| -10 | -23.3 | 25.4 | 20.6 | 175.1 | 142.0 | 90 | 32.2 | 230.1 | 204.5 | 1586.3 | 1410.0 |
| -5 | -20.6 | 30.7 | 25.5 | 211.6 | 175.8 | 95 | 35.0 | 252.2 | 225.2 | 1738.9 | 1553.1 |
| 0 | -17.8 | 36.6 | 30.9 | 252.3 | 213.0 | 100 | 37.8 | 275.7 | 247.1 | 1901.2 | 1704.0 |
| 5 | -15.0 | 43.2 | 36.9 | 297.8 | 254.4 | 105 | 40.6 | 300.7 | 270.5 | 2073.3 | 1865.3 |
| 10 | -12.2 | 50.4 | 43.6 | 347.4 | 300.6 | 110 | 43.3 | 327.2 | 295.3 | 2256.0 | 2036.4 |
| 15 | -9.4 | 58.3 | 50.9 | 402.0 | 351.0 | 115 | 46.1 | 355.3 | 321.7 | 2449.7 | 2218.4 |
| 20 | -6.7 | 66.9 | 58.9 | 461.3 | 406.1 | 120 | 48.9 | 385.1 | 349.7 | 2654.8 | 2411.3 |
| 25 | -3.9 | 76.3 | 67.6 | 526.0 | 466.1 | 125 | 51.7 | 416.6 | 379.4 | 2871.7 | 2615.9 |
| 30 | -1.1 | 86.5 | 77.1 | 596.4 | 531.6 | 130 | 54.4 | 449.9 | 410.8 | 3102.1 | 2832.0 |
| 35 | 1.7 | 97.5 | 87.4 | 672.3 | 602.6 | 135 | 57.2 | 485.1 | 444.0 | 3345.3 | 3061.0 |
| 40 | 4.4 | 109.4 | 98.5 | 754.3 | 679.2 | 140 | 60.0 | 522.2 | 479.0 | 3600.1 | 3301.8 |
| 45 | 7.2 | 122.3 | 110.6 | 843.2 | 762.5 | 145 | 62.8 | 561.4 | 516.0 | 3870.3 | 3558.4 |
| 50 | 10.0 | 136.1 | 123.5 | 938.4 | 851.6 | 150 | 65.6 | 602.8 | 555.0 | 4155.6 | 3826.0 |
| 55 | 12.8 | 151.1 | 137.5 | 1041.9 | 948.0 | ||||||