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R-404A Pressure Temperature Chart
Interactive PT chart for R-404A. Used in commercial supermarket refrigeration and cold storage. SNAP Rule 23 banned R-404A in new equipment — but millions of existing systems still need field support.
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R-404A Saturation Data
35 data points| Temperature | Pressure (psig) |
|---|---|
| -40°F | 5.4 |
| -35°F | 8.2 |
| -30°F | 11.3 |
| -25°F | 14.8 |
| -20°F | 18.6 |
| -15°F | 22.8 |
| -10°F | 27.5 |
| -5°F | 32.6 |
| 0°F | 38.2 |
| 5°F | 44.3 |
| 10°F | 51 |
| 15°F | 58.2 |
| 20°F | 66.1 |
| 25°F | 74.6 |
| 30°F | 83.9 |
| 35°F | 93.8 |
| 40°F | 104.6 |
| 45°F | 116.2 |
| 50°F | 128.6 |
| 55°F | 141.9 |
| 60°F | 156.2 |
| 65°F | 171.5 |
| 70°F | 187.8 |
| 75°F | 205.2 |
| 80°F | 223.8 |
| 85°F | 243.6 |
| 90°F | 264.7 |
| 95°F | 287.2 |
| 100°F | 311.1 |
| 105°F | 336.5 |
| 110°F | 363.5 |
| 115°F | 392.1 |
| 120°F | 422.5 |
| 125°F | 454.8 |
| 130°F | 489 |
Source: ASHRAE Fundamentals. Pressures are gauge (psig) at sea level. Negative values indicate vacuum conditions.
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R-404A Pressure Reference Values
R-404A (also sold as HP62, Genetron 404A, and Suva 404A) is an HFC blend of R-125, R-143a, and R-134a. It replaced R-502 and R-22 in commercial refrigeration and became the dominant refrigerant in supermarkets and cold storage through the 2000s and 2010s.
| Temperature | R-404A (psig) |
|---|---|
| -40°F / -40°C | 6 |
| -20°F / -29°C | 22 |
| 0°F / -18°C | 42 |
| 20°F / -7°C | 62 |
| 40°F / 4°C | 83 |
| 70°F / 21°C | 137 |
| 100°F / 38°C | 245 |
| 120°F / 49°C | 311 |
Approximate values. Use the interactive tool above for precise readings. Source: ASHRAE Fundamentals.
Key Facts About R-404A
R-404A has a Global Warming Potential (GWP) of 3,922 — the highest of any widely used commercial refrigerant. This is the primary reason it is being phased out under EPA SNAP rules and AIM Act regulations.
EPA SNAP Rule 23 prohibited R-404A in new supermarket systems and industrial process refrigeration systems effective January 1, 2017.
At 40°F, R-404A saturates at approximately 83 psig. At the common low-temperature freezer evaporating temperature of -20°F, R-404A saturates at approximately 22 psig.
R-404A requires POE (polyolester) oil as the compressor lubricant — not mineral oil. POE oil must be handled carefully because it absorbs moisture rapidly when exposed to air.
R-404A is a zeotropic blend with a small temperature glide of approximately 0.5°F. Cylinder orientation during charging matters: charging as liquid from the bottom of an inverted cylinder ensures correct blend composition.
R-404A PT Chart — Frequently Asked Questions
What is the normal operating pressure for R-404A?
R-404A saturation pressures: at -20°F (typical low-temp freezer evaporator), R-404A saturates at approximately 22 psig. At 0°F (medium-temp evaporator), approximately 42 psig. At 40°F, approximately 83 psig. At 100°F (condenser), approximately 245 psig. R-404A is widely used in commercial refrigeration and operates at pressures between R-22 and R-410A.
Is R-404A banned?
R-404A is banned in new supermarket refrigeration systems and condensing units under EPA SNAP Rule 23, effective January 1, 2017 for new systems over 2,200 lbs charge, and expanded to smaller systems subsequently. R-404A has a very high Global Warming Potential (GWP) of 3,922 — the highest of the major commercial refrigerants. Existing R-404A systems can still be serviced with reclaimed refrigerant, but new installations must use lower-GWP alternatives.
What refrigerant replaces R-404A in supermarkets?
The primary EPA-approved replacements for R-404A in new supermarket systems are: CO2 (R-744) in transcritical or cascade systems for new large stores; R-448A and R-449A as lower-GWP HFO/HFC blends for retrofit and medium-sized systems; R-452A as a direct lower-GWP alternative. R-407A and R-407F are also SNAP-approved for some applications. Each has different pressure-temperature characteristics, so a new PT chart lookup is required when switching refrigerants.
What is the superheat target for an R-404A system?
R-404A evaporator superheat targets depend on application: for medium-temperature walk-in coolers, typical superheat at the evaporator outlet is 8–12°F. For low-temperature applications, 10–15°F is common to ensure no liquid reaches the compressor. R-404A is a zeotropic blend with a temperature glide of about 0.5°F, which is small enough that most technicians treat it like a near-azeotrope for field calculations.
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