# R448a PT Chart: Pressures At -49°F To 150°F Temperatures (+PDF)

R448a PT chart is quite useful in HVAC. It tells you what is the pressure of R488a liquid and vapor refrigerant from -49°F to 150°F. Inversely, you can also tell the temperature of R488a refrigerant if you know the pressures (from 0.7 psig to 462.8 psig). Further on, you will find an online R448a pressure temperature chart as well as a printable R448a PT chart in PDF form you can take with you.

R448a (CAS name: Solistice N-40) is a blend of 4 HFC and HFO refrigerants. It is comprised of R32 (24.3%), R125 (24.7%), 134a (25.7%), 1234zf (25.3%) and it has a boiling point of -45.9°C (-50.62°F).

You can use the 448a PT chart for several different HVAC tasks, including:

• Telling what are the pressures of 448a on 65-degree, 70-degree, 75-degree, 80-degree, 85-degree, 90-degree, 95-degree, 100-degree days, and so on. We include 8 examples of how high are the pressures of R448a on 65-100 degree days.
• Identifying if the refrigerant in HVACR systems or reusable grey bottles are actually R448a or not.
• Differentiating between 488a and other refrigerants, based on the pressure temperature chart.
• Using the 488a vapor pressures to determine the superheat and total superheat and, if needed, charge more freon if 448a superheat is high or remove freon (recover it) if the 488a superheat is low.
• Using the 488a liquid pressures to determine the subcooling and, if needed, charge or recover freon is the 448a set lines.

Note: You always have to measure both pressure and temperature when the HVAC unit (AC, refrigerator) is off and equalized. When equalized (mixture of liquid and vapor at the same temperature), the pressures of 448a on high and low sides are the same (measured at service ports). If you measure the pressure when the HVAC unit is running, the saturated state is found only at the evaporator and the condenser.

Here is the full R488a PT chart, followed by those 8 examples, and a printable PDF version you can take with you on the job:

## 448a Pressure Temperature Chart

 Temperature (°F): Temperature (°C): 448a Liquid Pressure (psig): 448a Vapor Pressure (psig): -49°F -45.0°C 0.7 psig 0.0 psig -48°F -44.4°C 1.1 psig 0.0 psig -47°F -43.9°C 1.5 psig 0.0 psig -46°F -43.3°C 1.9 psig 0.0 psig -45°F -42.8°C 2.4 psig 0.0 psig -44°F -42.2°C 2.8 psig 0.0 psig -43°F -41.7°C 3.3 psig 0.0 psig -42°F -41.1°C 3.8 psig 0.0 psig -41°F -40.6°C 4.2 psig 0.0 psig -40°F -40.0°C 4.7 psig 0.0 psig -39°F -39.4°C 5.2 psig 0.2 psig -38°F -38.9°C 5.7 psig 0.6 psig -37°F -38.3°C 6.2 psig 1.1 psig -36°F -37.8°C 6.8 psig 1.5 psig -35°F -37.2°C 7.3 psig 1.9 psig -34°F -36.7°C 7.9 psig 2.4 psig -33°F -36.1°C 8.4 psig 2.8 psig -32°F -35.6°C 9.0 psig 3.3 psig -31°F -35.0°C 9.6 psig 3.7 psig -30°F -34.4°C 10.2 psig 4.2 psig -29°F -33.9°C 10.8 psig 4.7 psig -28°F -33.3°C 11.4 psig 5.2 psig -27°F -32.8°C 12.0 psig 5.7 psig -26°F -32.2°C 12.6 psig 6.3 psig -25°F -31.7°C 13.3 psig 6.8 psig -24°F -31.1°C 13.9 psig 7.3 psig -23°F -30.6°C 14.6 psig 7.9 psig -22°F -30.0°C 15.3 psig 8.4 psig -21°F -29.4°C 16.0 psig 9.0 psig -20°F -28.9°C 16.7 psig 9.6 psig -19°F -28.3°C 17.4 psig 10.2 psig -18°F -27.8°C 18.2 psig 10.8 psig -17°F -27.2°C 18.9 psig 11.2 psig -16°F -26.7°C 19.7 psig 12.1 psig -15°F -26.1°C 20.4 psig 12.7 psig -14°F -25.6°C 21.2 psig 13.4 psig -13°F -25.0°C 22.0 psig 14.0 psig -12°F -24.4°C 22.8 psig 14.7 psig -11°F -23.9°C 23.7 psig 15.4 psig -10°F -23.3°C 24.5 psig 16.1 psig -9°F -22.8°C 25.4 psig 16.8 psig -8°F -22.2°C 26.2 psig 17.6 psig -7°F -21.7°C 27.1 psig 18.3 psig -6°F -21.1°C 28.0 psig 19.1 psig -5°F -20.6°C 28.9 psig 19.8 psig -4°F -20.0°C 29.9 psig 20.6 psig -3°F -19.4°C 30.8 psig 21.4 psig -2°F -18.9°C 31.8 psig 22.2 psig -1°F -18.3°C 32.7 psig 23.1 psig 0°F -17.8°C 33.7 psig 23.9 psig 1°F -17.2°C 34.7 psig 24.8 psig 2°F -16.7°C 35.8 psig 25.6 psig 3°F -16.1°C 36.8 psig 26.5 psig 4°F -15.6°C 37.8 psig 27.4 psig 5°F -15.0°C 38.9 psig 28.3 psig 6°F -14.4°C 40.0 psig 29.3 psig 7°F -13.9°C 41.1 psig 30.2 psig 8°F -13.3°C 42.2 psig 31.2 psig 9°F -12.8°C 43.4 psig 32.2 psig 10°F -12.2°C 44.5 psig 33.1 psig 11°F -11.7°C 45.7 psig 34.2 psig 12°F -11.1°C 46.9 psig 35.2 psig 13°F -10.6°C 48.1 psig 36.2 psig 14°F -10.0°C 49.3 psig 37.3 psig 15°F -9.4°C 50.6 psig 38.4 psig 16°F -8.9°C 51.8 psig 39.4 psig 17°F -8.3°C 53.1 psig 40.6 psig 18°F -7.8°C 54.4 psig 41.7 psig 19°F -7.2°C 55.7 psig 42.8 psig 20°F -6.7°C 57.1 psig 44.0 psig 21°F -6.1°C 58.4 psig 45.2 psig 22°F -5.6°C 59.8 psig 46.4 psig 23°F -5.0°C 61.2 psig 47.6 psig 24°F -4.4°C 62.6 psig 48.8 psig 25°F -3.9°C 64.0 psig 50.1 psig 26°F -3.3°C 65.5 psig 51.3 psig 27°F -2.8°C 66.9 psig 52.6 psig 28°F -2.2°C 68.4 psig 53.9 psig 29°F -1.7°C 70.0 psig 55.3 psig 30°F -1.1°C 71.5 psig 56.6 psig 31°F -0.6°C 73.0 psig 58.0 psig 32°F 0°C 74.6 psig 59.4 psig 33°F 0.6°C 76.2 psig 60.8 psig 34°F 1.1°C 77.8 psig 62.2 psig 35°F 1.7°C 79.5 psig 63.7 psig 36°F 2.2°C 81.1 psig 65.1 psig 37°F 2.8°C 82.8 psig 66.6 psig 38°F 3.3°C 84.5 psig 68.1 psig 39°F 3.9°C 86.3 psig 69.7 psig 40°F 4.4°C 88.0 psig 71.2 psig 41°F 5.0°C 89.8 psig 72.8 psig 42°F 5.6°C 91.6 psig 74.4 psig 43°F 6.1°C 93.4 psig 76.0 psig 44°F 6.7°C 95.2 psig 77.7 psig 45°F 7.2°C 97.1 psig 79.3 psig 46°F 7.8°C 99.0 psig 81.0 psig 47°F 8.3°C 100.9 psig 82.7 psig 48°F 8.9°C 102.9 psig 84.5 psig 49°F 9.4°C 104.8 psig 86.2 psig 50°F 10.0°C 106.8 psig 88.0 psig 51°F 10.6°C 108.8 psig 89.8 psig 52°F 11.1°C 110.8 psig 91.7 psig 53°F 11.7°C 112.9 psig 93.5 psig 54°F 12.2°C 115.0 psig 95.4 psig 55°F 12.8°C 117.1 psig 97.3 psig 56°F 13.3°C 119.2 psig 99.2 psig 57°F 13.9°C 121.4 psig 101.2 psig 58°F 14.4°C 123.6 psig 103.2 psig 59°F 15.0°C 125.8 psig 105.2 psig 60°F 15.6°C 128.0 psig 107.2 psig 61°F 16.1°C 130.3 psig 109.3 psig 62°F 16.7°C 132.6 psig 111.3 psig 63°F 17.2°C 134.9 psig 113.4 psig 64°F 17.8°C 137.3 psig 115.6 psig 65°F 18.3°C 139.6 psig 117.7 psig 66°F 18.9°C 142.0 psig 119.9 psig 67°F 19.4°C 144.5 psig 122.1 psig 68°F 20.0°C 146.9 psig 124.4 psig 69°F 20.6°C 149.4 psig 126.7 psig 70°F 21.1°C 151.9 psig 129.0 psig 71°F 21.7°C 154.4 psig 131.3 psig 72°F 22.2°C 157.0 psig 133.7 psig 73°F 22.8°C 159.6 psig 136.0 psig 74°F 23.3°C 162.2 psig 138.5 psig 75°F 23.9°C 164.9 psig 140.9 psig 76°F 24.4°C 167.6 psig 143.4 psig 77°F 25.0°C 170.3 psig 145.9 psig 78°F 25.6°C 173.0 psig 148.4 psig 79°F 26.1°C 175.8 psig 151.0 psig 80°F 26.7°C 178.6 psig 153.6 psig 81°F 27.2°C 181.4 psig 156.2 psig 82°F 27.8°C 184.3 psig 158.8 psig 83°F 28.3°C 187.2 psig 161.5 psig 84°F 29.4°C 190.1 psig 164.3 psig 85°F 30.0°C 193.1 psig 167.0 psig 86°F 30.6°C 196.1 psig 169.8 psig 87°F 31.1°C 199.1 psig 172.6 psig 88°F 31.7°C 202.2 psig 175.4 psig 89°F 31.7°C 205.2 psig 178.3 psig 90°F 32.2°C 208.4 psig 181.2 psig 91°F 32.8°C 211.5 psig 184.2 psig 92°F 33.3°C 214.7 psig 187.2 psig 93°F 33.9°C 217.9 psig 190.2 psig 94°F 34.4°C 221.2 psig 193.2 psig 95°F 35.0°C 224.4 psig 196.3 psig 96°F 35.6°C 227.7 psig 199.4 psig 97°F 36.1°C 231.1 psig 202.6 psig 98°F 36.7°C 234.5 psig 205.8 psig 99°F 37.2°C 237.9 psig 209.0 psig 100°F 37.8°C 241.3 psig 212.3 psig 105°F 40.6°C 297.4 psig 265.7 psig 110°F 43.3°C 277.8 psig 246.9 psig 115°F 46.1°C 291.8 psig 289.6 psig 120°F 48.9°C 317.9 psig 285.6 psig 125°F 51.7°C 339.4 psig 306.5 psig 130°F 54.4°C 362.0 psig 328.5 psig 135°F 57.2°C 385.5 psig 351.8 psig 140°F 60.0°C 410.2 psig 376.3 psig 145°F 62.8°C 435.9 psig 402.1 psig 150°F 65.6°C 462.8 psig 429.4 psig

As always, the pressure of 448a rises with the temperature. If you want to figure out if you have a 448a refrigerant in the line set or in a bottle at certain temperatures, you can consult this PT chart.

Here are just a few examples of how to use the 448a pressure temperature chart given the outdoor temperature:

### Example 1: What Are 448a Pressures On A 65-Degree Day?

From the PT chart, we can read that the pressure of liquid 448a on a 65-degree day is 139.6 psig.

Similarly, we can see that the vapor pressure of 448a on a 65-degree is 117.7 psig.

### Example 2: What Are 448a Pressures On A 70-Degree Day?

From the PT chart, we can read that the pressure of liquid 448a on a 70-degree day is 151.9 psig.

Similarly, we can see that the vapor pressure of 448a on a 70-degree is 129.0 psig.

### Example 3: What Are 448a Pressures On A 75-Degree Day?

From the PT chart, we can read that the pressure of liquid 448a on a 75-degree day is 164.9 psig.

Similarly, we can see that the vapor pressure of 448a on a 75-degree is 140.9 psig.

### Example 4: What Are 448a Pressures On A 80-Degree Day?

From the PT chart, we can read that the pressure of liquid 448a on an 80-degree day is 178.6 psig.

Similarly, we can see that the vapor pressure of 448a on an 80-degree is 153.6 psig.

### Example 5: What Are 448a Pressures On A 85-Degree Day?

From the PT chart, we can read that the pressure of liquid 448a on an 85-degree day is 193.1 psig.

Similarly, we can see that the vapor pressure of 448a on an 85-degree is 167.0 psig.

### Example 6: What Are 448a Pressures On A 90-Degree Day?

From the PT chart, we can read that the pressure of liquid 448a on a 90-degree day is 208.4 psig.

Similarly, we can see that the vapor pressure of 448a on a 90-degree is 181.2 psig.

### Example 7: What Are 448a Pressures On A 95-Degree Day?

From the PT chart, we can read that the pressure of liquid 448a on a 95-degree day is 224.4 psig.

Similarly, we can see that the vapor pressure of 448a on a 95-degree is 196.3 psig.

### Example 8: What Are 448a Pressures On A 100-Degree Day?

From the PT chart, we can read that the pressure of liquid 448a on a 100-degree day is 241.3 psig.

Similarly, we can see that the vapor pressure of 448a on a 100-degree is 212.3 psig.

## 448a Pressure Temperature Chart PDF

As promised, you can get the printable PDF version of the 448a PT chart here if you need it on-site. Here is the full chart you can freely download and take with you:

With this printable PT chart, we hope that you will be able to use a 448aPT chart without any problems.