R-407C Pressure Temperature Chart
Bubble and dew point pressures (PSIG) for R-407C at temperatures from -40°F to 120°F. A zeotropic R-22 replacement with temperature glide.
| Temp (°F) | Bubble (PSIG) | Dew (PSIG) |
|---|---|---|
| -40°F | 3.0 | 1.2 |
| -20°F | 19.5 | 15.5 |
| 0°F | 41.5 | 35.6 |
| 20°F | 70.6 | 62.9 |
| 40°F | 108.5 | 99.0 |
| 60°F | 157.0 | 145.2 |
| 80°F | 218.2 | 203.6 |
| 100°F | 294.6 | 276.8 |
| 120°F | 389.1 | 367.6 |
Frequently Asked Questions
Why does R-407C have two pressures (bubble and dew)?
R-407C is a zeotropic blend of R-32, R-125, and R-134a. Unlike pure refrigerants, it evaporates and condenses over a temperature range (called temperature glide). The bubble point is the pressure where the liquid starts to boil, and the dew point is the pressure where the last drop of liquid evaporates. The glide is typically 8 to 10°F.
What is the saturation pressure of R-407C at 40°F?
At 40°F, R-407C has a bubble point pressure of 108.5 PSIG and a dew point pressure of 99.0 PSIG.
What is R-407C used for?
R-407C was designed as a retrofit replacement for R-22 in air conditioning and medium-temperature refrigeration systems. It has similar operating pressures and capacity to R-22, though it requires POE oil rather than mineral oil.