R454b is a low global warming potential HFC/HFO zeotropic blend used for the replacement of R-410A. In this post, we will cover details and features of the R454B pressure-temperature chart and its related features. So let’s get started.
What is R-454B Refrigerant?
R454 B is an HVAC refrigerant that comes with a 68.9% R-32 (difluoromethane) and 31.1% R-1234yf (tetrafluoropropene) mixture.
It is also known as an A2L refrigerant, which has low toxicity and normal flammability features that are controlled with sensors installed at the site.
454b refrigerant is best for new air conditioners and heat pumps. It offers proper cooling from the carrier with a smaller carbon footprint.
R-454B Pressure Temperature Chart (PT Chart)
| Saturation Temperature °F | Temperature °C | Pressure (PSIG) |
| -40 | -40 | 12 |
| -30 | -34.4 | 20 |
| -20 | -28.9 | 28 |
| -10 | -23.3 | 38 |
| 0 | -17.8 | 50 |
| 10 | -12.2 | 61 |
| 20 | -6.7 | 75 |
| 30 | -1.1 | 91 |
| 40 | 4.4 | 110 |
| 45 | 7.2 | 120 |
| 50 | 10 | 132 |
| 60 | 15.6 | 155 |
| 70 | 21.1 | 182 |
| 80 | 26.7 | 214 |
| 90 | 32.2 | 252 |
| 100 | 37.8 | 295 |
| 110 | 43.3 | 340 |
| 120 | 48.9 | 390 |
| 130 | 54.4 | 445 |
| 140 | 60 | 505 |
| 150 | 65.6 | 570 |
R-454B Saturation Temperature Chart
| Temperature Range | HVAC Application | Pressure |
| -40°F to 0°F | Low Temperature Refrigeration | 12–50 PSIG |
| 0°F to 20°F | Freezer / Medium Temp | 50–75 PSIG |
| 30°F to 45°F | Residential Evaporator | 90–120 PSIG |
| 45°F to 55°F | Comfort Cooling | 120–145 PSIG |
| 90°F to 110°F | Condensing Temperature | 250–340 PSIG |
| 110°F to 130°F | Hot Weather Operation | 340–445 PSIG |
R-454B Bubble Point vs Dew Point Chart
| Temperature °F | Bubble Pressure PSIG | Dew Pressure PSIG | Glide |
| 0°F | 49 | 51 | 2°F |
| 20°F | 74 | 77 | 2–3°F |
| 40°F | 109 | 112 | 2–3°F |
| 60°F | 154 | 157 | 2–3°F |
| 80°F | 213 | 216 | 2–3°F |
| 100°F | 294 | 298 | 3°F |
| 120°F | 389 | 394 | 3–4°F |
R-454B Low Side Pressure Chart (Evaporator)
| Evaporator Temperature | Pressure |
| 0°F | ~50 PSIG |
| 10°F | ~61 PSIG |
| 20°F | ~75 PSIG |
| 30°F | ~91 PSIG |
| 35°F | ~100 PSIG |
| 40°F | ~110 PSIG |
| 45°F | ~120 PSIG |
| 50°F | ~132 PSIG |
R-454B High Side Pressure Chart (Condenser)
| Condensing Temperature | Pressure |
| 80°F | ~214 PSIG |
| 90°F | ~252 PSIG |
| 100°F | ~295 PSIG |
| 105°F | ~317 PSIG |
| 110°F | ~340 PSIG |
| 120°F | ~390 PSIG |
| 130°F | ~445 PSIG |
| 140°F | ~505 PSIG |
R-454B HVAC Operating Pressure Chart
| System Condition | Suction Pressure | Discharge Pressure |
| Low Load Cooling | 90–110 PSIG | 220–280 PSIG |
| Normal AC Cooling | 110–130 PSIG | 280–340 PSIG |
| High Outdoor Temp | 120–145 PSIG | 340–420 PSIG |
| Heat Pump Heating Mode | 140–180 PSIG | 350–500 PSIG |
R-454B Superheat Reference Chart
| Suction Pressure | Saturation Temp | Typical Superheat |
| 75 PSIG | 20°F | 8–12°F |
| 90 PSIG | 30°F | 8–12°F |
| 110 PSIG | 40°F | 10–15°F |
| 120 PSIG | 45°F | 10–15°F |
| 130 PSIG | 50°F | 12–18°F |
R-454B Refrigerant Comparison Pressure Charts
R-454B vs R-410A Pressure Comparison Charts
| Saturation Temperature | R-454B Pressure (PSIG) | R-410A Pressure (PSIG) |
| 0°F (-17.8°C) | 50 | 51 |
| 20°F (-6.7°C) | 75 | 118 |
| 40°F (4.4°C) | 110 | 235 |
| 60°F (15.6°C) | 155 | 350 |
| 80°F (26.7°C) | 214 | 480 |
| 100°F (37.8°C) | 295 | 320 |
| 110°F (43.3°C) | 340 | 360 |
| 120°F (48.9°C) | 390 | 418 |
R-454B vs R-32 Pressure Comparison Chart
| Temperature | R-454B Pressure | R-32 Pressure |
| 0°F | 50 PSIG | 51 PSIG |
| 20°F | 75 PSIG | 80 PSIG |
| 40°F | 110 PSIG | 120 PSIG |
| 60°F | 155 PSIG | 175 PSIG |
| 80°F | 214 PSIG | 250 PSIG |
| 100°F | 295 PSIG | 320 PSIG |
| 120°F | 390 PSIG | 420 PSIG |
R-454B vs R-407C Pressure Comparison Chart
| Temperature | R-454B | R-407C |
| 0°F | 50 PSIG | 48 PSIG |
| 20°F | 75 PSIG | 68 PSIG |
| 40°F | 110 PSIG | 105 PSIG |
| 60°F | 155 PSIG | 145 PSIG |
| 80°F | 214 PSIG | 210 PSIG |
| 100°F | 295 PSIG | 260 PSIG |
| 120°F | 390 PSIG | 340 PSIG |
R-454B vs R-134a Pressure Comparison Chart
| Temperature | R-454B | R-134a |
| 0°F | 50 PSIG | 15 PSIG |
| 20°F | 75 PSIG | 24 PSIG |
| 40°F | 110 PSIG | 37 PSIG |
| 60°F | 155 PSIG | 70 PSIG |
| 80°F | 214 PSIG | 102 PSIG |
| 100°F | 295 PSIG | 130 PSIG |
| 120°F | 390 PSIG | 170 PSIG |
R-454B vs R-404A Pressure Comparison Chart
| Temperature | R-454B | R-404A |
| 0°F | 50 PSIG | 54 PSIG |
| 20°F | 75 PSIG | 90 PSIG |
| 40°F | 110 PSIG | 150 PSIG |
| 60°F | 155 PSIG | 210 PSIG |
| 80°F | 214 PSIG | 300 PSIG |
| 100°F | 295 PSIG | 370 PSIG |
| 120°F | 390 PSIG | 460 PSIG |
Is R-454B Freon natural?
No, R22 uses Freon as a brand name, while r454b comes with the brands Opteon™ XL41, Solstice® 454B, and Forane® 454B.
R-454B effect on environments
r454b is energy-efficient, minimizes greenhouse gases occurring from electricity usage, and refrigerants offer low GWP.
r454b does not affect ozone depletion potential, with low toxicity. But GWP is 75 percent less than older refrigerant.
But it is energy-efficient and a new HVAC industry standard in residential air conditioners and heat pumps.
FAQs of R454B Refrigerant
What is the chemical composition of R454B refrigerant?
R454B is a mixture of 69.5% difluoromethane (R32) and 30.5% pentafluoroethane (R125). That mixture causes less ozone depletion potential refrigerant, having less effect on the environment compared to other refrigerants, for example, R410A, R407C, and R134A.
How does the Montreal Protocol affect the application of R410A and R454B?
The Montreal Protocol, used for the protection of the ozone layer, comes with a phasedown schedule for hydrofluorocarbons (HFCs) to control effects on the environment.
For this phase-down, Havac Industry uses an environmentally friendly refrigerant with less ozone depletion.
R45b refrigerant is the best replacement for R410a since it fulfills all requirements and is part of the ALTERNATE program according to the SNAP (Significant New Alternatives Policy) program.
Can R-410A be replaced with R-454B?
R410a is not used as a replacement for R454b units. A system that uses R410 is not supported for the R454b refrigerant since it has different pressure features and safety requirements. With that, the R-454B system needed certain safety parameters, like a dissipation system working effectively, to manage leaks that are not offered with R-410A.
What is the difference between 410A and 454B?
The basic difference is the environmental factor and composition. The R-410A mixture of R-32 and R-125 has a GWP of 2,088. R-454B is a mixture of R-32 and R-1234yf with a GWP of 466.
r454b is best for conditions with working at the same pressure.
Read more charts
- R422B Refrigerant PT Chart
- R-290 Propane Refrigerant PT Chart
- R-448A N40 Refrigerant PT Chart
- R407A Pressure-Temperature Chart
- R507 Pressure-Temperature Chart
