R-407C pressure-temperature chart
R-407C pressure-temperature chart with bubble-point saturation pressure from -40°F to 140°F, generated from CoolProp.
What this refrigerant PT chart answers
R-407C is a zeotropic blend often used as an R-22 replacement in compatible equipment.
This page is maintained by the HVAC Calculator Pro Editorial Team. We publish the inputs, calculation basis and limitations so a technician can reproduce the screening result and decide what must be checked in the field. It is a reference aid, not a substitute for the governing code, a licensed designer or the equipment manufacturer's instructions.
Bubble-point saturation table
gauge pressure · sea-level reference| Temperature | Equivalent | Pressure |
|---|---|---|
| -40 °F | -40.0 °C | 2.7 PSIG |
| -35 °F | -37.2 °C | 5.1 PSIG |
| -30 °F | -34.4 °C | 7.7 PSIG |
| -25 °F | -31.7 °C | 10.6 PSIG |
| -20 °F | -28.9 °C | 13.7 PSIG |
| -15 °F | -26.1 °C | 17.2 PSIG |
| -10 °F | -23.3 °C | 20.9 PSIG |
| -5 °F | -20.6 °C | 25.0 PSIG |
| 0 °F | -17.8 °C | 29.5 PSIG |
| 5 °F | -15.0 °C | 34.3 PSIG |
| 10 °F | -12.2 °C | 39.5 PSIG |
| 15 °F | -9.4 °C | 45.2 PSIG |
| 20 °F | -6.7 °C | 51.2 PSIG |
| 25 °F | -3.9 °C | 57.7 PSIG |
| 30 °F | -1.1 °C | 64.7 PSIG |
| 35 °F | 1.7 °C | 72.2 PSIG |
| 40 °F | 4.4 °C | 80.2 PSIG |
| 45 °F | 7.2 °C | 88.8 PSIG |
| 50 °F | 10.0 °C | 97.9 PSIG |
| 55 °F | 12.8 °C | 107.6 PSIG |
| 60 °F | 15.6 °C | 117.9 PSIG |
| 65 °F | 18.3 °C | 128.9 PSIG |
| 70 °F | 21.1 °C | 140.5 PSIG |
| 75 °F | 23.9 °C | 152.8 PSIG |
| 80 °F | 26.7 °C | 165.8 PSIG |
| 85 °F | 29.4 °C | 179.6 PSIG |
| 90 °F | 32.2 °C | 194.1 PSIG |
| 95 °F | 35.0 °C | 209.4 PSIG |
| 100 °F | 37.8 °C | 225.5 PSIG |
| 105 °F | 40.6 °C | 242.4 PSIG |
| 110 °F | 43.3 °C | 260.2 PSIG |
| 115 °F | 46.1 °C | 278.9 PSIG |
| 120 °F | 48.9 °C | 298.6 PSIG |
| 125 °F | 51.7 °C | 319.2 PSIG |
| 130 °F | 54.4 °C | 340.7 PSIG |
| 135 °F | 57.2 °C | 363.3 PSIG |
| 140 °F | 60.0 °C | 387.0 PSIG |
How to use this R-407C pressure-temperature chart
- Identify the refrigerant and confirm the unit's design data plate.
- Measure line temperature at the same stable operating point as the gauge pressure.
- Use the chart to translate saturation temperature and then apply the manufacturer's superheat or subcooling procedure.
Worked example: The displayed pressure is the bubble-point result; do not use it for a dew-point superheat calculation. Use dew temperature for superheat and bubble temperature for subcooling unless the manufacturer specifies another convention.
Record the result with the project address, equipment model, code edition and assumptions. That audit trail is more useful than copying a single number without its conditions.
Continue with the right tool
What is specific to R-407C
Temperature glide can create a meaningful difference between dew and bubble pressures, especially across a heat exchanger.
Safety and climate profile: Safety classification A1; approximate 100-year GWP 1,774; zeotropic blend with significant temperature glide.
PSIG is gauge pressure. Absolute pressure adds local atmospheric pressure, so a gauge reading cannot be compared directly with an absolute-pressure chart without conversion.
For the governing safety and refrigerant-transition context, consult the U.S. EPA refrigerant guidance and the equipment manufacturer documentation.
Use boundary: This table does not model line pressure drop, superheat, subcooling, altitude correction or field safety controls. Confirm the correct blend basis and dew/bubble convention before using it.
Common questions
Can I use the R-407C pressure alone to charge a system?
No. Pressure must be interpreted with line temperature, airflow, operating mode and the manufacturer's charging method.
Why does this R-407C page say bubble point?
Bubble point is the saturated-liquid reference used by this generated table. Zeotropic blends may also require a dew-point reference, so the service procedure controls.