EPA 608 Refrigerant Pressure-Temperature Chart - 1.42

Q: What temperatures and pressure ranges are covered by this EPA 608 chart?

The chart lists refrigerant pressure values at multiple temperature points. It separates ranges into low-pressure (<30 psig), medium-pressure (30–155 psig), and higher-pressure sections (e.g., 155–340 psig) tied to a condensing temperature reference of 104°F.

Q: How does the chart distinguish between bubble liquid and dew vapor?

For applicable refrigerants, the table provides separate values labeled as Bubble Liquid and Dew Vapor. This lets readers compare pressures corresponding to different phase/conditions at the same temperature step.

Q: What role do ASHRAE class and GWP play in the chart?

Each refrigerant column is associated with an ASHRAE class entry and a GWP value. This supports classification and environmental-impact context alongside the pressure–temperature data used for studying EPA 608 concepts.

Sep 30, 2026

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Refrigerant pressure–temperature reference tables for the Official EPA 608 exam, presenting pressure values across a range of temperatures. The chart compares low-pressure refrigerants (<30 psig) and medium/high-pressure refrigerants measured against condensing temperature at 104°F, with values organized by ASHRAE classes and refrigerant types. It includes GWP, pressure categories, and bubble-liquid versus dew-vapor calculations for selected refrigerants to support exam study and verification.

LanguageEnglish

CategoryExam

FormatPDF

Pages2

Reading Time5 min

AccessFree to download

Refrigerant pressure-temperature tables

Low-, medium-, and high-pressure refrigerant ranges

ASHRAE class and GWP references

| | Low-Pressure Refrigerant <30 psig
at 104°F condensing temperature | | | Medium-Pressure Refrigerant 30 to 155 psigat 104°F condensing temperature | | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | ASHRAE
Class | B1 | B1 | A2L | A1 | A1 | A1 | | A1 | A3 | A2L | A2L | ASHRAE
Class | | GWP | 77 | 1030 | 4.7-7 | 10,900 | 609 | 1558 | | 1430 | 3 | 4 | 6 | GWP | | | HCFC | HFC | HFO | CFC | HCFC | HCFC R-409A | | HFC | Hydrocarbon
Isobutane | HFO | HFO | | | °F | R-123 | R-245fa | R-1233zd | R-12 | R-124 | Bubble*
Liquid | Dew*
Vapor | R-134a | R-600a | R-1234yf | R-1234ze | °F | | -40° | * | -13.9 | -28.3 | -11.0 | -22.1 | 6.7 | -14.8 | -14.8 | -21.6 | -11.5 | -19.1 | -40° | | -35° | * | -13.7 | -28.0 | -8.4 | -20.9 | 3.5 | -12.5 | -12.5 | -20.4 | -8.9 | -17.4 | -35° | | -30° | * | -13.5 | -27.6 | -5.5 | -19.4 | 0.0 | -9.9 | -9.8 | -18.9 | -6.0 | -15.4 | -30° | | -25° | * | -13.2 | -27.2 | -2.4 | -11.8 | 1.9 | -7.0 | -6.9 | -17.4 | -2.8 | -13.3 | -25° | | -20° | -27.8 | -13.0 | -26.7 | 0.5 | -16.0 | 4.0 | -3.8 | -3.1 | -15.6 | 0.4 | -10.9 | -20° | | -15° | -27.4 | -12.7 | -26.1 | 2.4 | -14.0 | 6.3 | 2.0 | -0.1 | -13.7 | 2.3 | -8.2 | -15° | | -10° | -26.9 | -12.2 | -25.5 | 4.5 | -11.8 | 8.8 | 1.8 | 1.9 | -11.5 | 4.4 | -5.3 | -10° | | -5° | -26.4 | -11.9 | -24.7 | 6.7 | -9.3 | 11.6 | 4.0 | 4.1 | -9.2 | 6.7 | -2.0 | -5° | | 0° | -25.9 | -11.4 | -23.9 | 9.1 | -6.6 | 14.6 | 6.3 | 6.5 | -6.6 | 9.1 | -0.8 | 0° | | 5° | -25.2 | -11.0 | -23.0 | 11.7 | -3.6 | 17.8 | 8.8 | 9.1 | -3.8 | 12.0 | 2.7 | 5° | | 10° | -24.5 | -10.4 | -22.0 | 14.6 | -0.3 | 21.3 | 11.6 | 11.9 | -0.7 | 14.9 | 4.8 | 10° | | 15° | -23.8 | -9.5 | -20.8 | 17.7 | 1.6 | 25.1 | 14.7 | 15.0 | 1.3 | 18.1 | 7.2 | 15° | | 20° | -22.8 | -9.1 | -19.5 | 21.0 | 3.6 | 29.2 | 18.0 | 18.4 | 3.1 | 21.6 | 9.7 | 20° | | 25° | -21.8 | -8.0 | -18.1 | 24.6 | 5.7 | 33.6 | 21.6 | 22.1 | 5.0 | 25.4 | 12.5 | 25° | | 30° | -20.7 | -7.5 | -16.5 | 28.4 | 8.0 | 38.4 | 25.5 | 26.1 | 7.1 | 29.4 | 15.4 | 30° | | 35° | -19.5 | -6.8 | -14.7 | 32.5 | 10.5 | 43.4 | 29.7 | 30.4 | 9.4 | 33.8 | 18.7 | 35° | | 40° | -18.1 | -5.6 | -12.8 | 36.9 | 13.2 | 48.9 | 34.2 | 35.0 | 11.8 | 38.4 | 22.2 | 40° | | 45° | -16.6 | -4.2 | -10.7 | 41.6 | 16.1 | 54.7 | 39.1 | 40.1 | 14.4 | 43.4 | 26.0 | 45° | | 50° | -14.9 | -2.8 | -8.3 | 46.6 | 19.3 | 60.9 | 44.3 | 45.4 | 17.2 | 48.8 | 30.0 | 50° | | 55° | -13.0 | -1.8 | -5.8 | 51.9 | 22.7 | 67.5 | 49.9 | 51.2 | 20.2 | 54.5 | 34.4 | 55° | | 60° | -11.2 | 0.0 | -3.0 | 57.6 | 26.3 | 74.5 | 55.9 | 57.4 | 23.5 | 60.6 | 39.1 | 60° | | 65° | -8.9 | 1.9 | 0.0 | 63.7 | 30.2 | 81.9 | 62.3 | 64.0 | 26.9 | 67.0 | 44.1 | 65° | | 70° | -6.5 | 3.5 | 1.6 | 70.1 | 34.4 | 89.8 | 69.2 | 71.1 | 30.6 | 73.9 | 49.5 | 70° | | 75° | -4.1 | 5.9 | 3.4 | 76.8 | 38.9 | 98.2 | 76.5 | 78.7 | 34.5 | 81.3 | 55.2 | 75° | | 80° | -1.2 | 7.9 | 5.3 | 84.0 | 43.7 | 107 | 84.2 | 86.7 | 38.6 | 89.0 | 61.3 | 80° | | 85° | 0.9 | 10.2 | 7.3 | 91.6 | 48.8 | 116 | 92.5 | 95.2 | 43.0 | 97.2 | 67.8 | 85° | | 90° | 2.5 | 12.8 | 9.5 | 99.6 | 54.3 | 126 | 101 | 104 | 47.7 | 106 | 74.8 | 90° | | 95° | 4.3 | 15.8 | 11.9 | 108 | 60.1 | 137 | 111 | 114 | 52.7 | 115 | 82.1 | 95° | | 100° | 6.1 | 19.0 | 14.4 | 117 | 66.2 | 148 | 120 | 124 | 57.9 | 125 | 89.9 | 100° | | 104° | 7.7 | 21.3 | 16.6 | 124 | 71.4 | 157 | 129 | 133 | 62.3 | 133 | 96.5 | 104° | | 105° | 8.1 | 23.0 | 17.1 | 126 | 72.7 | 159 | 131 | 135 | 63.4 | 135 | 98.2 | 105° | | 110° | 10.3 | 26.0 | 20.0 | 136 | 79.6 | 171 | 142 | 146 | 69.3 | 146 | 107 | 110° | | 115° | 12.6 | 30.0 | 23.1 | 146 | 86.9 | 184 | 153 | 158 | 75.4 | 157 | 116 | 115° | | 120° | 15.1 | 33.0 | 26.5 | 157 | 94.6 | 197 | 166 | 171 | 81.9 | 169 | 126 | 120° | | 125° | 17.8 | 36.0 | 30.0 | 169 | 103 | 211 | 179 | 185 | 88.7 | 182 | 136 | 125° | | 130° | 20.6 | 41.0 | 33.8 | 181 | 111 | 226 | 192 | 199 | 95.8 | 195 | 147 | 130° | | 135° | 23.6 | 46.0 | 37.8 | 193 | 120 | 241 | 207 | 214 | 103 | 209 | 158 | 135° |

FAQs

What temperatures and pressure ranges are covered by this EPA 608 chart?

The chart lists refrigerant pressure values at multiple temperature points. It separates ranges into low-pressure (<30 psig), medium-pressure (30–155 psig), and higher-pressure sections (e.g., 155–340 psig) tied to a condensing temperature reference of 104°F.

How does the chart distinguish between bubble liquid and dew vapor?

For applicable refrigerants, the table provides separate values labeled as Bubble Liquid and Dew Vapor. This lets readers compare pressures corresponding to different phase/conditions at the same temperature step.

What role do ASHRAE class and GWP play in the chart?

Each refrigerant column is associated with an ASHRAE class entry and a GWP value. This supports classification and environmental-impact context alongside the pressure–temperature data used for studying EPA 608 concepts.

Sep 30, 2026

Upload by Fans