R410A PT Chart: Pressure Temperature Chart For 410A Refrigerant

R410A is one of the most commonly used refrigerants. It’s patented by Honeywell, and known under several other names such as “AZ-20”, “Genetron R410A”, “Puron”, and so on. It’s the preferred freon for residential air conditioners, replacing the older R22 according to the Montreal Protocol and subsequently phasing out of R22.

To properly use it, you need an R410A PT chart. This is a pressure-temperature chart that specifies the saturation pressure for R410A at any given temperature. The R410A PT chart can be used to answer questions like:

What are normal operating pressures for 410A?

What is the pressure of r410a at 72 degrees Fahrenheit?

What should gauge read for 410A?

Here is the full 410A PT chart for liquid state (after the chart, you can also find a useful R410A PT graph):

R410A Pressure-Temperature Chart

Temperature (°C) Pressure (barA) Pressure (barg) Pressure (psig)
-70 °C 0,36 barA -0,66 barg -9,52 psig
-68 °C 0,40 barA -0,61 barg -8,85 psig
-66 °C 0,45 barA -0,56 barg -8,10 psig
-64 °C 0,51 barA -0,50 barg -7,27 psig
-62 °C 0,57 barA -0,44 barg -6,37 psig
-60 °C 0,64 barA -0,37 barg -5,37 psig
-58 °C 0,72 barA -0,30 barg -4,29 psig
-56 °C 0,80 barA -0,21 barg -3,10 psig
-54 °C 0,89 barA -0,12 barg -1,81 psig
-52 °C 0,98 barA -0,03 barg -0,41 psig
-50 °C 1,09 barA 0,08 barg 1,11 psig
-48 °C 1,20 barA 0,19 barg 2,76 psig
-46 °C 1,33 barA 0,31 barg 4,54 psig
-44 °C 1,46 barA 0,45 barg 6,46 psig
-42 °C 1,60 barA 0,59 barg 8,53 psig
-40 °C 1,76 barA 0,74 barg 10,76 psig
-38 °C 1,92 barA 0,91 barg 13,15 psig
-36 °C 2,10 barA 1,08 barg 15,71 psig
-34 °C 2,29 barA 1,27 barg 18,45 psig
-32 °C 2,49 barA 1,47 barg 21,38 psig
-30 °C 2,70 barA 1,69 barg 24,51 psig
-28 °C 2,93 barA 1,92 barg 27,84 psig
-26 °C 3,18 barA 2,16 barg 31,38 psig
-24 °C 3,44 barA 2,42 barg 35,16 psig
-22 °C 3,71 barA 2,70 barg 39,16 psig
-20 °C 4,01 barA 2,99 barg 43,41 psig
-18 °C 4,32 barA 3,30 barg 47,91 psig
-16 °C 4,65 barA 3,63 barg 52,67 psig
-14 °C 4,99 barA 3,98 barg 57,70 psig
-12 °C 5,36 barA 4,35 barg 63,02 psig
-10 °C 5,75 barA 4,73 barg 68,63 psig
-8 °C 6,15 barA 5,14 barg 74,54 psig
-6 °C 6,58 barA 5,57 barg 80,76 psig
-4 °C 7,03 barA 6,02 barg 87,31 psig
-2 °C 7,51 barA 6,50 barg 94,19 psig
0 °C 8,01 barA 6,99 barg 101,42 psig
2 °C 8,53 barA 7,52 barg 109,00 psig
4 °C 9,08 barA 8,07 barg 116,95 psig
6 °C 9,65 barA 8,64 barg 125,28 psig
8 °C 10,25 barA 9,24 barg 133,99 psig
10 °C 10,88 barA 9,87 barg 143,13 psig
12 °C 11,54 barA 10,53 barg 152,66 psig
14 °C 12,23 barA 11,22 barg 162,63 psig
16 °C 12,95 barA 11,93 barg 173,03 psig
18 °C 13,70 barA 12,68 barg 183,89 psig
20 °C 14,48 barA 13,48 barg 195,21 psig
22 °C 15,29 barA 14,28 barg 207,02 psig
24 °C 16,14 barA 15,13 barg 219,31 psig
26 °C 17,02 barA 16,01 barg 232,10 psig
28 °C 17,94 barA 16,93 barg 245,41 psig
30 °C 18,89 barA 17,88 barg 259,26 psig
32 °C 19,89 barA 18,87 barg 273,66 psig
34 °C 20,92 barA 19,91 barg 288,62 psig
36 °C 21,99 barA 20,98 barg 304,15 psig
38 °C 23,10 barA 22,09 barg 320,49 psig
40 °C 24,26 barA 23,24 barg 337,02 psig
42 °C 25,45 barA 24,44 barg 354,29 psig
44 °C 26,70 barA 25,68 barg 372,42 psig
46 °C 27,99 barA 26,97 barg 391,09 psig
48 °C 29,32 barA 28,31 barg 410,47 psig
50 °C 30,71 barA 29,69 barg 430,55 psig
52 °C 32,14 barA 31,13 barg 451,34 psig
54 °C 33,63 barA 32,61 barg 472,90 psig
56 °C 35,17 barA 34,16 barg 495,25 psig
58 °C 36,76 barA 35,75 barg 518,39 psig
60 °C 38,42 barA 37,41 barg 542,37 psig
62 °C 40,13 barA 39,12 barg 567,24 psig
64 °C 41,91 barA 40,90 barg 593,02 psig
66 °C 43,75 barA 42,74 barg 619,74 psig
68 °C 45,67 barA 44,66 barg 647,5 psig
70 °C 47,65 barA 46,64 barg 676,28 psig

Example: What is the pressure of r410a at 72 degrees Fahrenheit? We can see that at 72°F, the R410A pressure is 208,4 psig.

As you can, the pressure at a specific temperature is usually given in 3 different units:

  • barA. Known as “absolute pressure“; pressure against a perfect vacuum. It’s calculated as Gauge Pressure + Atmospheric Pressure. The standard atmospheric pressure of 101,3 Pa or 14,7 psi is used. Hence, the barA unit is equal to Gauge Pressure + 14,7 psi.
  • barg. Used to describe R410A gauge pressure; it’s commonly referred to as “2-bar gauge pressure” in HVAC literature.
  • psig. Pounds Per Square Inch (psig) is most commonly used to express pressure levels at a specific temperature for R410A refrigerant. In universal units, 1 psi equals to about 6895 N/m2.

Usually you can get these R410A PT charts with every R410A refrigerant. For some people, using a graph instead of a chart is easier. Here is the Celsius-to-barA graph for R410A:

R410A PT Graph (Celsius-to-barA)

If you’re more comfortable using degrees Fahrenheit, you can also use a Fahrenheit-to-barA graph:

Hopefully these two graphs will help some people to figure out the saturation points for the R410A refrigerant.

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