R454B PT Chart: Pressures At -40°F To 150°F Temperatures

R454B refrigerant pressure chart tells you what are pressures of R454B at -40°F to 150°F temperatures. If you know the temperature, you can use the R454B PT chart to determine the pressure. If you know the pressure of R454B (between 8.8 psig and 581.4 psig), you can also use the chart to determine the temperature of the refrigerant.

You will find two useful resources here, namely:

• Online R454B pressure temperature chart spanning from -40°F to 150°F temp.
• Printable PDF version of R454B PT chart you can take with you on the job.

There are several brand names for R454B: Opteon XL41, Solstice 454B, and Puron Advance. This is a blend of R32 (68.9%) and R1234yf (31.1%). It has a very low boiling point of -59.5°F (-50.9°C). That’s why is primarily used in air conditioners. Note: Due to very low boiling point, pressures of liquid R454B refrigerant exceeds 300 psig on 100-degree days.

You can use the R454B refrigerant PT chart for:

• Checking operating pressures of R454B.
• Check what pressures should R454B have 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.
• Figure out if the AC line set or a reusable freon bottle contains R454B  refrigerant.
• Differentiate between R454B and other refrigerants, like R22, R410a, and so on.
• Use it to calculate the required R454B superheat and total superheat. For superheat, you will need to know R454B vapor pressures (3rd column in the chart).
• Use it to calculate the required R454B subcooling. For subcooling, you will need to use the R454B liquid pressure (4th column in the chart).

Note: When measuring pressures, the R454B refrigerant has to be in a saturated state (mixture of liquid and vapor). That’s why you have to turn the air conditioner off and wait for the refrigerant to equalize. That means that the pressure of R454B is the same on the high side and low side. When measuring pressures on a running AC unit, be aware that the saturated state only exists at the evaporator and condenser (compressor contains vapor, TXV valve contains liquid).

With this in mind, let’s have a look at the R454B PT chart and the 8 temperature examples (at the end you will also find a printable PDF version):

454B Pressure Temperature Chart

This chart contains all R454B operating pressures at different temperatures. If we presume that the outdoor temperature around the line set is stable, the refrigerant will also have that same temperature. We can use the PT chart to tell how what are the pressures of R454B refrigerant on hotter and colder days like this:

Example 1: What Are R454B Pressures On A 65-Degree Day?

From the PT chart, we can read that the pressure of liquid R454B on a 65-degree day is 177.3 psig.

Similarly, we can see that the vapor pressure of R454B on a 65-degree is 169.3 psig.

Example 2: What Are R454B Pressures On A 70-Degree Day?

From the PT chart, we can read that the pressure of liquid R454B on a 70-degree day is 192.5 psig.

Similarly, we can see that the vapor pressure of R454B on a 70-degree is 184.0 psig.

Example 3: What Are R454B Pressures On A 75-Degree Day?

From the PT chart, we can read that the pressure of liquid R454B on a 75-degree day is 208.6 psig.

Similarly, we can see that the vapor pressure of R454B on a 75-degree is 199.6 psig.

Example 4: What Are R454B Pressures On A 80-Degree Day?

From the PT chart, we can read that the pressure of liquid 4R454B on an 80-degree day is 225.6 psig.

Similarly, we can see that the vapor pressure of R454B on an 80-degree is 216.1 psig.

Example 5: What Are R454B Pressures On A 85-Degree Day?

From the PT chart, we can read that the pressure of liquid R454B on an 85-degree day is 243.6 psig.

Similarly, we can see that the vapor pressure of R454B on an 85-degree is 233.5 psig.

Example 6: What Are R454B Pressures On A 90-Degree Day?

From the PT chart, we can read that the pressure of liquid R454B on a 90-degree day is 262.5 psig.

Similarly, we can see that the vapor pressure of R454B on a 90-degree is 251.9 psig.

Example 7: What Are R454B Pressures On A 95-Degree Day?

From the PT chart, we can read that the pressure of liquid R454B on a 95-degree day is 282.5 psig.

Similarly, we can see that the vapor pressure of R454B on a 95-degree is 271.4 psig.

Example 8: What Are R454B Pressures On A 100-Degree Day?

From the PT chart, we can read that the pressure of liquid R454B on a 100-degree day is 303.6 psig.

Similarly, we can see that the vapor pressure of R454B on a 100-degree is 291.6 psig.

R454B Pressure Temperature Chart PDF

As promised, you can get the printable PDF version of the R454B 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 an R454B chart without any problems.

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