R-22 Pressure-Temperature Chart
Click the saturation curve, edit a value, or scan the table — every view stays in sync. ASHRAE-sourced data for legacy R-22 systems still in service.
For Licensed & Trained HVAC Technicians Only
This checklist is intended exclusively for use by licensed, certified, and trained HVAC professionals. It is not a DIY guide and should not be used by untrained individuals to perform repairs or diagnostics. The purpose of this checklist is to help qualified technicians maintain a consistent, step-by-step workflow so that no critical step is overlooked or skipped during service.
R-22 Saturation Curve
Chlorodifluoromethane (HCFC) — single-component, phased out
Click or tap anywhere on the chart — the cursor snaps to the R-22 saturation curve and stays there until your next click.
Direct Lookup
Edit either field — the other updates instantly. The chart cursor moves in sync.
Lookup Table
Tap any row to highlight that point on the chart.
| Temp (°F) | Pressure (psig) |
|---|---|
| -40 | 0.5 |
| -30 | 4.9 |
| -20 | 10.1 |
| -10 | 16.5 |
| 0 | 24.0 |
| 10 | 32.8 |
| 20 | 43.0 |
| 30 | 54.9 |
| 40 | 68.5 |
| 50 | 84.0 |
| 60 | 101.6 |
| 70 | 121.4 |
| 80 | 143.6 |
| 90 | 168.4 |
| 100 | 195.9 |
| 110 | 226.4 |
| 120 | 259.9 |
| 130 | 296.8 |
| 140 | 337.2 |
| 150 | 381.4 |
How to use this chart
The saturation curve shows the pressure at which liquid and vapor R-22 coexist for a given temperature. In the field, you read this two ways:
- Suction-side superheat: measure suction pressure → look up saturation temperature → subtract from the suction-line temperature. Open Superheat Calculator →
- Liquid-side subcooling: measure liquid pressure → look up saturation temperature → subtract the liquid-line temperature. Open Subcool Calculator →
R-22 is a single-component HCFC refrigerant, so a single saturation curve applies to both bubble and dew points. New production was phased out in the U.S. under the Montreal Protocol on January 1, 2020, but reclaimed R-22 remains legal for servicing existing systems.
Data source: ASHRAE Handbook of Fundamentals refrigerant property tables.
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