If you are working in HVAC, you might need an R422D PT chart. This pressure temperature chart will tell you the pressures of R422D at -49°F to 150°F temperatures. Inversely, you can also measure the pressure (from 10.5 psig to 426.1 psig) and use the PT chart to determine the temperature.
When in need of pressure-temperature properties of R422D you can use the following two resources:
- Online R422D pressure temperature chart.
- Printable PDF R422D PT chart that you can print out and take with you on the job.
R422D, also known as Freon MO29, is an R22 retrofit refrigerant comprised of R125 (65.1%), R134a (31.5%), and R600a (3.4%). It has a low boiling point of -44.7°C (-48.5°F) at 1 atmospheric pressure. That’s why is used in low-temp applications such as air conditioners and cars.
Here is what you can use this R422D pressure temperature chart for:
- Checking R422D operating pressures.
- Figuring out what are R422D pressures on 65-degree, 70-degree, 75-degree, 80-degree, 85-degree, 90-degree, 95-degree, 100-degree days, and so on. We will solve 8 examples for 65-100 degree days to illustrate how to use the PT chart.
- R422D identification in AC line sets or in unmarked refrigerant bottles.
- Differentiating between R422D and R22 (R422D is a retrofit of R22).
- R422D superheat and total superheat calculation. To calculate superheat, you have to use the R422D vapor pressures (4th column in the chart).
- R422D subcooling calculation. To calculate subcooling, you have to use the R422D liquid pressures (3rd column in the chart).
Note: Always measure pressures when the AC is off and equalized. Only when the system is equalized, the R422D refrigerant is in a saturated state. This means that the pressure on the high side is the same as the pressure on the low side. If you want to use the R422D PT chart with a running air conditioner, you will have to measure the pressures at the evaporator or condenser because that are the only 2 places where the refrigerant is in a saturated state.
Being mindful of all of this, let’s have a look at the R422D PT chart:
422D Pressure Temperature Chart
| Temperature (°F): | Temperature (°C): | R422D Liquid Pressure (psig): | R422D Vapor Pressure (psig): |
| -49°F | -45.0°C | 13.5 psig | 10.5 psig |
| -48°F | -44.4°C | 13.9 psig | 10.8 psig |
| -47°F | -43.9°C | 14.2 psig | 11.1 psig |
| -46°F | -43.3°C | 14.6 psig | 11.5 psig |
| -45°F | -42.8°C | 15.0 psig | 11.8 psig |
| -44°F | -42.2°C | 15.4 psig | 12.1 psig |
| -43°F | -41.7°C | 15.8 psig | 12.5 psig |
| -42°F | -41.1°C | 16.2 psig | 12.8 psig |
| -41°F | -40.6°C | 16.6 psig | 13.2 psig |
| -40°F | -40.0°C | 17.1 psig | 13.5 psig |
| -39°F | -39.4°C | 17.5 psig | 13.9 psig |
| -38°F | -38.9°C | 17.9 psig | 14.3 psig |
| -37°F | -38.3°C | 18.4 psig | 14.7 psig |
| -36°F | -37.8°C | 18.9 psig | 15.1 psig |
| -35°F | -37.2°C | 19.3 psig | 15.5 psig |
| -34°F | -36.7°C | 19.8 psig | 15.9 psig |
| -33°F | -36.1°C | 20.3 psig | 16.4 psig |
| -32°F | -35.6°C | 20.8 psig | 16.8 psig |
| -31°F | -35.0°C | 21.3 psig | 17.3 psig |
| -30°F | -34.4°C | 21.8 psig | 17.7 psig |
| -29°F | -33.9°C | 22.4 psig | 18.2 psig |
| -28°F | -33.3°C | 22.9 psig | 18.6 psig |
| -27°F | -32.8°C | 23.5 psig | 19.1 psig |
| -26°F | -32.2°C | 24.0 psig | 19.6 psig |
| -25°F | -31.7°C | 24.6 psig | 20.1 psig |
| -24°F | -31.1°C | 25.2 psig | 20.6 psig |
| -23°F | -30.6°C | 25.8 psig | 21.2 psig |
| -22°F | -30.0°C | 26.4 psig | 21.7 psig |
| -21°F | -29.4°C | 27.0 psig | 22.2 psig |
| -20°F | -28.9°C | 27.6 psig | 22.8 psig |
| -19°F | -28.3°C | 28.2 psig | 23.4 psig |
| -18°F | -27.8°C | 28.9 psig | 23.9 psig |
| -17°F | -27.2°C | 29.6 psig | 24.5 psig |
| -16°F | -26.7°C | 30.2 psig | 25.1 psig |
| -15°F | -26.1°C | 30.9 psig | 25.7 psig |
| -14°F | -25.6°C | 31.6 psig | 26.4 psig |
| -13°F | -25.0°C | 32.3 psig | 27.0 psig |
| -12°F | -24.4°C | 33.0 psig | 27.6 psig |
| -11°F | -23.9°C | 33.8 psig | 28.3 psig |
| -10°F | -23.3°C | 34.5 psig | 29.0 psig |
| -9°F | -22.8°C | 35.4 psig | 29.7 psig |
| -8°F | -22.2°C | 36.0 psig | 30.3 psig |
| -7°F | -21.7°C | 36.8 psig | 31.1 psig |
| -6°F | -21.1°C | 37.6 psig | 31.8 psig |
| -5°F | -20.6°C | 38.4 psig | 32.5 psig |
| -4°F | -20.0°C | 39.2 psig | 33.2 psig |
| -3°F | -19.4°C | 40.1 psig | 34.0 psig |
| -2°F | -18.9°C | 40.9 psig | 34.8 psig |
| -1°F | -18.3°C | 41.8 psig | 35.6 psig |
| 0°F | -17.8°C | 42.6 psig | 36.4 psig |
| 1°F | -17.2°C | 43.5 psig | 37.2 psig |
| 2°F | -16.7°C | 44.4 psig | 38.0 psig |
| 3°F | -16.1°C | 45.3 psig | 38.8 psig |
| 4°F | -15.6°C | 46.3 psig | 39.7 psig |
| 5°F | -15.0°C | 47.2 psig | 40.5 psig |
| 6°F | -14.4°C | 48.2 psig | 41.4 psig |
| 7°F | -13.9°C | 49.2 psig | 42.3 psig |
| 8°F | -13.3°C | 50.1 psig | 43.2 psig |
| 9°F | -12.8°C | 51.1 psig | 44.2 psig |
| 10°F | -12.2°C | 52.2 psig | 45.1 psig |
| 11°F | -11.7°C | 53.2 psig | 46.1 psig |
| 12°F | -11.1°C | 54.3 psig | 47.0 psig |
| 13°F | -10.6°C | 55.3 psig | 48.0 psig |
| 14°F | -10.0°C | 56.4 psig | 49.0 psig |
| 15°F | -9.4°C | 57.5 psig | 50.0 psig |
| 16°F | -8.9°C | 58.6 psig | 51.1 psig |
| 17°F | -8.3°C | 59.7 psig | 52.1 psig |
| 18°F | -7.8°C | 60.9 psig | 53.2 psig |
| 19°F | -7.2°C | 62.1 psig | 54.3 psig |
| 20°F | -6.7°C | 63.2 psig | 55.4 psig |
| 21°F | -6.1°C | 64.4 psig | 56.5 psig |
| 22°F | -5.6°C | 65.7 psig | 57.6 psig |
| 23°F | -5.0°C | 66.9 psig | 58.8 psig |
| 24°F | -4.4°C | 68.1 psig | 59.9 psig |
| 25°F | -3.9°C | 69.4 psig | 61.1 psig |
| 26°F | -3.3°C | 70.7 psig | 62.3 psig |
| 27°F | -2.8°C | 72.0 psig | 63.5 psig |
| 28°F | -2.2°C | 73.3 psig | 64.8 psig |
| 29°F | -1.7°C | 74.7 psig | 66.0 psig |
| 30°F | -1.1°C | 76.0 psig | 67.3 psig |
| 31°F | -0.6°C | 77.4 psig | 68.6 psig |
| 32°F | 0°C | 78.8 psig | 69.9 psig |
| 33°F | 0.6°C | 80.2 psig | 71.2 psig |
| 34°F | 1.1°C | 81.6 psig | 72.6 psig |
| 35°F | 1.7°C | 83.1 psig | 74.0 psig |
| 36°F | 2.2°C | 84.5 psig | 75.3 psig |
| 37°F | 2.8°C | 86.0 psig | 76.8 psig |
| 38°F | 3.3°C | 87.5 psig | 78.2 psig |
| 39°F | 3.9°C | 89.1 psig | 79.6 psig |
| 40°F | 4.4°C | 90.6 psig | 81.1 psig |
| 41°F | 5.0°C | 92.2 psig | 82.6 psig |
| 42°F | 5.6°C | 93.8 psig | 84.1 psig |
| 43°F | 6.1°C | 95.4 psig | 85.6 psig |
| 44°F | 6.7°C | 97.0 psig | 87.2 psig |
| 45°F | 7.2°C | 98.7 psig | 88.7 psig |
| 46°F | 7.8°C | 100.3 psig | 90.3 psig |
| 47°F | 8.3°C | 102.0 psig | 91.9 psig |
| 48°F | 8.9°C | 103.8 psig | 93.6 psig |
| 49°F | 9.4°C | 105.5 psig | 95.2 psig |
| 50°F | 10.0°C | 107.3 psig | 96.9 psig |
| 51°F | 10.6°C | 109.0 psig | 98.6 psig |
| 52°F | 11.1°C | 110.8 psig | 100.3 psig |
| 53°F | 11.7°C | 112.7 psig | 102.1 psig |
| 54°F | 12.2°C | 114.5 psig | 103.8 psig |
| 55°F | 12.8°C | 116.4 psig | 105.6 psig |
| 56°F | 13.3°C | 118.3 psig | 107.5 psig |
| 57°F | 13.9°C | 120.3 psig | 109.3 psig |
| 58°F | 14.4°C | 122.1 psig | 111.1 psig |
| 59°F | 15.0°C | 124.1 psig | 113.0 psig |
| 60°F | 15.6°C | 126.1 psig | 114.9 psig |
| 61°F | 16.1°C | 128.1 psig | 116.9 psig |
| 62°F | 16.7°C | 130.1 psig | 118.8 psig |
| 63°F | 17.2°C | 132.2 psig | 120.8 psig |
| 64°F | 17.8°C | 134.3 psig | 122.8 psig |
| 65°F | 18.3°C | 136.4 psig | 124.8 psig |
| 66°F | 18.9°C | 138.5 psig | 126.9 psig |
| 67°F | 19.4°C | 140.6 psig | 129.0 psig |
| 68°F | 20.0°C | 142.8 psig | 131.1 psig |
| 69°F | 20.6°C | 145.0 psig | 133.2 psig |
| 70°F | 21.1°C | 147.3 psig | 135.4 psig |
| 71°F | 21.7°C | 149.5 psig | 137.5 psig |
| 72°F | 22.2°C | 151.8 psig | 139.8 psig |
| 73°F | 22.8°C | 154.1 psig | 142.0 psig |
| 74°F | 23.3°C | 156.4 psig | 144.2 psig |
| 75°F | 23.9°C | 158.8 psig | 146.5 psig |
| 76°F | 24.4°C | 161.2 psig | 148.8 psig |
| 77°F | 25.0°C | 163.6 psig | 151.2 psig |
| 78°F | 25.6°C | 166.0 psig | 153.6 psig |
| 79°F | 26.1°C | 168.5 psig | 156.0 psig |
| 80°F | 26.7°C | 171.0 psig | 158.4 psig |
| 81°F | 27.2°C | 173.5 psig | 160.8 psig |
| 82°F | 27.8°C | 176.1 psig | 163.3 psig |
| 83°F | 28.3°C | 178.6 psig | 165.8 psig |
| 84°F | 29.4°C | 181.1 psig | 168.4 psig |
| 85°F | 30.0°C | 183.9 psig | 170.9 psig |
| 86°F | 30.6°C | 186.5 psig | 173.5 psig |
| 87°F | 31.1°C | 189.2 psig | 176.2 psig |
| 88°F | 31.7°C | 191.9 psig | 178.8 psig |
| 89°F | 31.7°C | 194.7 psig | 181.5 psig |
| 90°F | 32.2°C | 197.4 psig | 184.2 psig |
| 91°F | 32.8°C | 200.3 psig | 187.0 psig |
| 92°F | 33.3°C | 203.1 psig | 189.7 psig |
| 93°F | 33.9°C | 206.0 psig | 192.5 psig |
| 94°F | 34.4°C | 208.8 psig | 195.4 psig |
| 95°F | 35.0°C | 211.8 psig | 198.3 psig |
| 96°F | 35.6°C | 214.7 psig | 201.2 psig |
| 97°F | 36.1°C | 217.7 psig | 204.1 psig |
| 98°F | 36.7°C | 220.7 psig | 207.1 psig |
| 99°F | 37.2°C | 223.8 psig | 210.1 psig |
| 100°F | 37.8°C | 226.9 psig | 213.1 psig |
| 105°F | 40.6°C | 242.7 psig | 228.7 psig |
| 110°F | 43.3°C | 259.4 psig | 245.2 psig |
| 115°F | 46.1°C | 276.9 psig | 262.6 psig |
| 120°F | 48.9°C | 295.4 psig | 280.9 psig |
| 125°F | 51.7°C | 314.7 psig | 300.2 psig |
| 130°F | 54.4°C | 334.9 psig | 320.5 psig |
| 135°F | 57.2°C | 356.1 psig | 341.9 psig |
| 140°F | 60.0°C | 378.4 psig | 364.3 psig |
| 145°F | 62.8°C | 401.7 psig | 388.0 psig |
| 150°F | 65.6°C | 426.1 psig | 412.9 psig |
This table will tell you the operating pressures of R422D at various temperatures. Let’s solve some examples to illustrate how to use the PT chart:
Example 1: What Are R422D Pressures On A 65-Degree Day?
From the PT chart, we can read that the pressure of liquid R422D on a 65-degree day is 136.4 psig.
Similarly, we can see that the vapor pressure of R422D on a 65-degree is 124.8 psig.
Example 2: What Are R422D Pressures On A 70-Degree Day?
From the PT chart, we can read that the pressure of liquid R422D on a 70-degree day is 147.3 psig.
Similarly, we can see that the vapor pressure of R422D on a 70-degree is 135.4 psig.
Example 3: What Are R422D Pressures On A 75-Degree Day?
From the PT chart, we can read that the pressure of liquid R422D on a 75-degree day is 158.8 psig.
Similarly, we can see that the vapor pressure of R422D on a 75-degree is 146.5 psig.
Example 4: What Are R422D Pressures On A 80-Degree Day?
From the PT chart, we can read that the pressure of liquid R422D on an 80-degree day is 171.0 psig.
Similarly, we can see that the vapor pressure of R422D on an 80-degree is 158.4 psig.
Example 5: What Are R422D Pressures On A 85-Degree Day?
From the PT chart, we can read that the pressure of liquid R422D on an 85-degree day is 183.9 psig.
Similarly, we can see that the vapor pressure of R422D on an 85-degree is 170.9 psig.
Example 6: What Are R422D Pressures On A 90-Degree Day?
From the PT chart, we can read that the pressure of liquid R422D on a 90-degree day is 197.4 psig.
Similarly, we can see that the vapor pressure of R422D on a 90-degree is 184.2 psig.
Example 7: What Are R422D Pressures On A 95-Degree Day?
From the PT chart, we can read that the pressure of liquid R422D on a 95-degree day is 211.8 psig.
Similarly, we can see that the vapor pressure of R422D on a 95-degree is 198.3 psig.
Example 8: What Are R422D Pressures On A 100-Degree Day?
From the PT chart, we can read that the pressure of liquid R422D on a 100-degree day is 226.9 psig.
Similarly, we can see that the vapor pressure of R422D on a 100-degree is 213.1 psig.
R422D PT Chart PDF (Printable PDF For On-Site Use)
As promised, you can get the printable PDF version of the R422D PT chart here if you need it on-site:
Hopefully, you now know to use the R422D PT chart to determine the pressures of R422D at various temperatures. This can make your HVAC jobs easier. You can also check these PT charts for other common refrigerants: