R-22 PT Chart
HVAC Cheat Sheet · hvaccheatsheet.com/charts/r-22-pt-chart
At 40°F, R-22 is about 68.6 psig. At 100°F it's about 195.9 psig. Look up any reading below, or print the full chart.
The older residential refrigerant. Production ended in 2020, so service relies on recovered and reclaimed supply.
Prints the full chart on one page.
| °F | °C | psig |
|---|---|---|
| -38 | -38.9 | 1.4 |
| -36 | -37.8 | 2.2 |
| -34 | -36.7 | 3.1 |
| -32 | -35.6 | 4.0 |
| -30 | -34.4 | 4.9 |
| -28 | -33.3 | 5.9 |
| -26 | -32.2 | 6.9 |
| -24 | -31.1 | 8.0 |
| -22 | -30.0 | 9.1 |
| -20 | -28.9 | 10.2 |
| -18 | -27.8 | 11.4 |
| -16 | -26.7 | 12.6 |
| -14 | -25.6 | 13.9 |
| -12 | -24.4 | 15.2 |
| -10 | -23.3 | 16.5 |
| -8 | -22.2 | 17.9 |
| -6 | -21.1 | 19.4 |
| -4 | -20.0 | 20.9 |
| -2 | -18.9 | 22.4 |
| 0 | -17.8 | 24.0 |
| 2 | -16.7 | 25.7 |
| 4 | -15.6 | 27.4 |
| 6 | -14.4 | 29.2 |
| 8 | -13.3 | 31.0 |
| 10 | -12.2 | 32.8 |
| 12 | -11.1 | 34.8 |
| 14 | -10.0 | 36.8 |
| 16 | -8.9 | 38.8 |
| 18 | -7.8 | 40.9 |
| 20 | -6.7 | 43.1 |
| 22 | -5.6 | 45.3 |
| 24 | -4.4 | 47.6 |
| 26 | -3.3 | 50.0 |
| 28 | -2.2 | 52.4 |
| 30 | -1.1 | 55.0 |
| 32 | 0.0 | 57.5 |
| 34 | 1.1 | 60.2 |
| 36 | 2.2 | 62.9 |
| 38 | 3.3 | 65.7 |
| 40 | 4.4 | 68.6 |
| 42 | 5.6 | 71.5 |
| 44 | 6.7 | 74.5 |
| 46 | 7.8 | 77.6 |
| 48 | 8.9 | 80.8 |
| 50 | 10.0 | 84.1 |
| 52 | 11.1 | 87.4 |
| 54 | 12.2 | 90.8 |
| 56 | 13.3 | 94.4 |
| 58 | 14.4 | 98.0 |
| 60 | 15.6 | 101.6 |
| 62 | 16.7 | 105.4 |
| 64 | 17.8 | 109.3 |
| 66 | 18.9 | 113.2 |
| 68 | 20.0 | 117.3 |
| 70 | 21.1 | 121.4 |
| 72 | 22.2 | 125.7 |
| 74 | 23.3 | 130.0 |
| 76 | 24.4 | 134.5 |
| 78 | 25.6 | 139.0 |
| 80 | 26.7 | 143.6 |
| 82 | 27.8 | 148.4 |
| 84 | 28.9 | 153.2 |
| 86 | 30.0 | 158.2 |
| 88 | 31.1 | 163.2 |
| 90 | 32.2 | 168.4 |
| 92 | 33.3 | 173.7 |
| 94 | 34.4 | 179.1 |
| 96 | 35.6 | 184.6 |
| 98 | 36.7 | 190.2 |
| 100 | 37.8 | 195.9 |
| 105 | 40.6 | 210.8 |
| 110 | 43.3 | 226.4 |
| 115 | 46.1 | 242.8 |
| 120 | 48.9 | 260.0 |
| 125 | 51.7 | 278.0 |
| 130 | 54.4 | 296.9 |
| 135 | 57.2 | 316.7 |
| 140 | 60.0 | 337.4 |
| 145 | 62.8 | 359.0 |
| 150 | 65.6 | 381.7 |
| °F | °C | psig |
|---|---|---|
| -38 | -38.9 | 1.4 |
| -36 | -37.8 | 2.2 |
| -34 | -36.7 | 3.1 |
| -32 | -35.6 | 4.0 |
| -30 | -34.4 | 4.9 |
| -28 | -33.3 | 5.9 |
| -26 | -32.2 | 6.9 |
| -24 | -31.1 | 8.0 |
| -22 | -30.0 | 9.1 |
| -20 | -28.9 | 10.2 |
| -18 | -27.8 | 11.4 |
| -16 | -26.7 | 12.6 |
| -14 | -25.6 | 13.9 |
| -12 | -24.4 | 15.2 |
| -10 | -23.3 | 16.5 |
| -8 | -22.2 | 17.9 |
| -6 | -21.1 | 19.4 |
| -4 | -20.0 | 20.9 |
| -2 | -18.9 | 22.4 |
| 0 | -17.8 | 24.0 |
| 2 | -16.7 | 25.7 |
| 4 | -15.6 | 27.4 |
| 6 | -14.4 | 29.2 |
| 8 | -13.3 | 31.0 |
| 10 | -12.2 | 32.8 |
| 12 | -11.1 | 34.8 |
| 14 | -10.0 | 36.8 |
| 16 | -8.9 | 38.8 |
| 18 | -7.8 | 40.9 |
| 20 | -6.7 | 43.1 |
| 22 | -5.6 | 45.3 |
| 24 | -4.4 | 47.6 |
| 26 | -3.3 | 50.0 |
| 28 | -2.2 | 52.4 |
| 30 | -1.1 | 55.0 |
| 32 | 0.0 | 57.5 |
| 34 | 1.1 | 60.2 |
| 36 | 2.2 | 62.9 |
| 38 | 3.3 | 65.7 |
| 40 | 4.4 | 68.6 |
| °F | °C | psig |
|---|---|---|
| 42 | 5.6 | 71.5 |
| 44 | 6.7 | 74.5 |
| 46 | 7.8 | 77.6 |
| 48 | 8.9 | 80.8 |
| 50 | 10.0 | 84.1 |
| 52 | 11.1 | 87.4 |
| 54 | 12.2 | 90.8 |
| 56 | 13.3 | 94.4 |
| 58 | 14.4 | 98.0 |
| 60 | 15.6 | 101.6 |
| 62 | 16.7 | 105.4 |
| 64 | 17.8 | 109.3 |
| 66 | 18.9 | 113.2 |
| 68 | 20.0 | 117.3 |
| 70 | 21.1 | 121.4 |
| 72 | 22.2 | 125.7 |
| 74 | 23.3 | 130.0 |
| 76 | 24.4 | 134.5 |
| 78 | 25.6 | 139.0 |
| 80 | 26.7 | 143.6 |
| 82 | 27.8 | 148.4 |
| 84 | 28.9 | 153.2 |
| 86 | 30.0 | 158.2 |
| 88 | 31.1 | 163.2 |
| 90 | 32.2 | 168.4 |
| 92 | 33.3 | 173.7 |
| 94 | 34.4 | 179.1 |
| 96 | 35.6 | 184.6 |
| 98 | 36.7 | 190.2 |
| 100 | 37.8 | 195.9 |
| 105 | 40.6 | 210.8 |
| 110 | 43.3 | 226.4 |
| 115 | 46.1 | 242.8 |
| 120 | 48.9 | 260.0 |
| 125 | 51.7 | 278.0 |
| 130 | 54.4 | 296.9 |
| 135 | 57.2 | 316.7 |
| 140 | 60.0 | 337.4 |
| 145 | 62.8 | 359.0 |
| 150 | 65.6 | 381.7 |
- Typical cooling-mode suction runs around 65–75 psig (about 38–44°F saturation) at normal conditions.
- R-22 runs at roughly 60% of R-410A pressures. Never charge R-410A, R-454B or R-32 into an R-22 system.
- Only EPA 608 certified technicians can buy and handle it.
- Gauge pressure at sea level. At high elevation a gauge reads slightly higher for the same temperature (roughly 0.5 psi per 1,000 ft).
How to use a PT chart
A PT chart gives the temperature at which a refrigerant boils or condenses at a given pressure. Read your gauge, find the saturation temperature, then compare it with the line temperature you measure:
- Superheat = suction line temperature − saturation temperature at suction pressure.
- Subcooling = saturation temperature at liquid pressure − liquid line temperature.
The superheat and subcooling calculator does the math, and how to read a PT chart walks through it step by step. Always charge to the equipment manufacturer's instructions.
Source
Values are from the Daikin Comfort Technologies A1 vs. A2L pressure-temperature chart (data provided by Weitron), and were spot-checked against other manufacturer charts. Interpolated lookups are estimates.
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Field reference only. Confirm against the refrigerant manufacturer's data and the equipment manufacturer's charging instructions. Spot an error? Tell us.