R1234yf Refrigerant Pressure Temperature Chart

- Aug 22, 2020-


The HFO R-1234yf is the refrigerant of the future. Or, at least, that is how it has been marketed. Yf was the first HFO refrigerant to see mainstream attention. A few years back there was immense pressure in the European Union to stop using the HFC R-134a for automotive air conditioning. The pressure was there due to the extremely high Global Warming Potential (GWP) that R-134a has. R-134a has a GWP of one-thousand four-hundred and thirty. It is classified as a super pollutant.

The answer to the world’s problems came with the announcement of the new HFO refrigerant known as R-1234yf. Yf refrigerant has a Global Warming Potential of only four. That is a huge difference when comparing it to other refrigerants on the market today. The only downside for yf is that it is rated as slightly flammable or 2L from ASHRAE and other air conditioning organizations.

The European Union quickly phased down and out R-134a and had their new vehicles start taking R-1234yf. While the acceptance of yf is much slower here in the United States there are numerous vehicle manufacturers who have begun using this refrigerant in their newer model vehicles. With each year that passes more and more vehicles begin taking yf.


1234yf Pressure Chart

One of the very first steps when it comes to diagnosing a vehicle’s air conditioner is understanding the temperature and the current pressure that your system is operating at. Having these facts along with the saturation point, the subcool, and the superheat  numbers for the refrigerant you are working on are essential when it comes to really understanding what is going wrong with your system.

The chart below details the pressures and the saturation point, or boiling point, R-1234yf:

°F°CPSIKPA
-94-70-9.82-67.7
-90.4-68-9.26-63.8
-86.8-66-8.65-59.6
-83.2-64-7.99-55.1
-79.6-62-7.27-50.1
-76-60-6.49-44.7
-72.4-58-5.65-39.0
-68.8-56-4.73-32.6
-65.2-54-3.75-25.9
-61.6-52-2.69-18.5
-58-50-1.55-10.7
-54.4-48-0.33-2.3
-50.8-460.996.8
-47.2-442.3916.5
-43.6-423.8926.8
-40-405.4937.9
-36.4-387.1949.6
-32.8-369.0162.1
-29.2-3410.9475.4
-25.6-3212.9989.6
-22-3015.17104.6
-18.4-2817.47120.5
-14.8-2619.91137.3
-11.2-2422.49155.1
-7.6-2225.21173.8
-4-2028.08193.6
-0.4-1831.11214.5
3.2-1634.29236.4
6.8-1437.64259.5
10.4-1241.17283.9
14-1044.87309.4
17.6-848.75336.1
21.2-652.82364.2
24.8-457.09393.6
28.4-261.56424.4
32066.23456.6
35.6271.11490.3
39.2476.21525.4
42.8681.54562.2
46.4887.09600.5
501092.89640.5
53.61298.92682.0
57.214105.21725.4
60.816111.75770.5
64.418118.55817.4
6820125.63866.2
71.622132.98916.9
75.224140.62969.5
78.826148.541024.1
82.428156.771080.9
8630165.31139.7
89.632174.151200.7
93.234183.321263.9
96.836192.821329.4
100.438202.651397.2
10440212.851467.5
107.642223.391540.2
111.244234.291615.4
114.846245.571693.1
118.448257.241773.6
12250269.311856.8
125.652281.761942.7
129.25494.75653.3
132.856100.09690.1
136.458105.62728.2
14060111.34767.7
143.662117.26808.5
147.264123.38850.7
150.866129.71894.3
154.468136.26939.5
15870143986.0