R22 pressure temperature chart (PT)
An R22 pressure temperature chart (PT chart) is a saturation lookup for R22: it relates temperature and saturation pressure when liquid and vapor coexist in equilibrium. It’s useful for thermodynamic interpretation, but it is not a universal “normal running pressure” diagnostic chart.
Regulatory note (R22)
R22 is an HCFC refrigerant. Availability and permitted use vary by country/region and application, and rules change over time. FluidTool provides calculations and reference data only — it does not recommend what fluid you should use. Always follow local regulations and OEM guidance.
See also: R22 data sheet and GWP & ODP.
Pressure basis: absolute vs gauge
The table below is absolute pressure (kPa(a), bar(a), psi(a)). Many gauges display gauge pressure (relative to ambient). Converting requires local atmospheric pressure:
Learn more: Gauge vs absolute pressure (psig vs psia).
R22 saturation pressure vs temperature (reference table)
Generated using CoolProp (the same property engine used by FluidTool) at Q=0 saturation. Values are rounded for readability.
| T (°C) | T (°F) | Psat (kPa(a)) | Psat (bar(a)) | Psat (psi(a)) |
|---|---|---|---|---|
| -20 | -4 | 245.3 | 2.453 | 35.6 |
| -10 | 14 | 354.8 | 3.548 | 51.5 |
| 0 | 32 | 498.0 | 4.980 | 72.2 |
| 10 | 50 | 680.9 | 6.809 | 98.8 |
| 20 | 68 | 910.0 | 9.100 | 132.0 |
| 30 | 86 | 1191.9 | 11.919 | 172.9 |
| 40 | 104 | 1533.6 | 15.336 | 222.4 |
| 50 | 122 | 1942.7 | 19.427 | 281.8 |
| 60 | 140 | 2427.5 | 24.275 | 352.1 |
| 70 | 158 | 2997.4 | 29.974 | 434.7 |
How to verify any row in FluidTool
- Open FluidTool with R22 selected: /?fluid=R22
- Choose a Two-phase input pair (Temperature & Quality / T + Q).
- Set Q=0 and enter the temperature from the table to read Psat.
Related
- Refrigerant PT chart: what Tsat(P)/Psat(T) means and common pitfalls.
- Superheat & Subcooling: interpret measured line temperature vs saturation temperature.