R422D PT Chart: Pressure For -49°F To 150°F Temperatures (+PDF)

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:

  1. Online R422D pressure temperature chart.
  2. 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:

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