R-407C PT Chart
A1 GWP 1774Zeotropic blend (R-32/R-125/R-134a). HFC Blend.
About R-407C
R-407C was designed to match R-22's capacity in air conditioning and became the most common R-22 retrofit for split systems. It is a three-part blend of R-32, R-125 and R-134a with about 10°F of glide. That means the vapor (dew) and liquid (bubble) pressures below differ a lot, and using the wrong column is the most common charging mistake with this refrigerant.
Saturation pressures at typical operating points, taken from the table below:
- Evaporator (AC, 40°F): 80.2 PSIG liquid / 63.2 PSIG vapor
- Condensing (110°F): 260.2 PSIG liquid / 229.0 PSIG vapor
The table covers -80°F to 180°F in 5°F steps. Below about -47°F the liquid saturation pressure is below atmospheric, so gauges read in vacuum (shown in blue in the table).
R-407C Pressure-Temperature Graph (Bubble & Dew)
R-407C Saturation Pressure Table
R-407C is a zeotropic blend with temperature glide, so it has two saturation pressures at each temperature. Use Vapor (dew) PSIG to find evaporator saturation for superheat, and Liquid (bubble) PSIG to find condenser saturation for subcooling. PSIA, kPa and bar columns are liquid (bubble) pressures. Blue values indicate vacuum.
| °F | °C | Liquid PSIG (bubble) |
Vapor PSIG (dew) |
PSIA | kPa | bar |
|---|---|---|---|---|---|---|
| -80 | -62.2 | -9.2 | -11.2 | 5.48 | 37.8 | 0.378 |
| -75 | -59.4 | -8.3 | -10.5 | 6.43 | 44.4 | 0.444 |
| -70 | -56.7 | -7.2 | -9.8 | 7.51 | 51.8 | 0.518 |
| -65 | -53.9 | -6.0 | -8.9 | 8.73 | 60.2 | 0.602 |
| -60 | -51.1 | -4.6 | -7.9 | 10.11 | 69.7 | 0.697 |
| -55 | -48.3 | -3.0 | -6.7 | 11.65 | 80.4 | 0.804 |
| -50 | -45.6 | -1.3 | -5.4 | 13.38 | 92.3 | 0.923 |
| -45 | -42.8 | 0.6 | -3.9 | 15.31 | 105.5 | 1.055 |
| -40 | -40.0 | 2.7 | -2.3 | 17.44 | 120.3 | 1.203 |
| -35 | -37.2 | 5.1 | -0.4 | 19.81 | 136.6 | 1.366 |
| -30 | -34.4 | 7.7 | 1.6 | 22.41 | 154.5 | 1.545 |
| -25 | -31.7 | 10.6 | 3.9 | 25.29 | 174.3 | 1.743 |
| -20 | -28.9 | 13.7 | 6.5 | 28.44 | 196.1 | 1.961 |
| -15 | -26.1 | 17.2 | 9.3 | 31.88 | 219.8 | 2.198 |
| -10 | -23.3 | 20.9 | 12.3 | 35.64 | 245.8 | 2.458 |
| -5 | -20.6 | 25.0 | 15.7 | 39.74 | 274.0 | 2.74 |
| 0 | -17.8 | 29.5 | 19.4 | 44.19 | 304.7 | 3.047 |
| 5 | -15.0 | 34.3 | 23.5 | 49.01 | 337.9 | 3.379 |
| 10 | -12.2 | 39.5 | 27.9 | 54.23 | 373.9 | 3.739 |
| 15 | -9.4 | 45.2 | 32.7 | 59.86 | 412.7 | 4.127 |
| 20 | -6.7 | 51.2 | 37.9 | 65.92 | 454.5 | 4.545 |
| 25 | -3.9 | 57.7 | 43.5 | 72.44 | 499.4 | 4.994 |
| 30 | -1.1 | 64.7 | 49.6 | 79.43 | 547.6 | 5.476 |
| 35 | 1.7 | 72.2 | 56.1 | 86.92 | 599.3 | 5.993 |
| 40 | 4.4 | 80.2 | 63.2 | 94.93 | 654.5 | 6.545 |
| 45 | 7.2 | 88.8 | 70.7 | 103.49 | 713.5 | 7.135 |
| 50 | 10.0 | 97.9 | 78.8 | 112.61 | 776.4 | 7.764 |
| 55 | 12.8 | 107.6 | 87.5 | 122.32 | 843.4 | 8.434 |
| 60 | 15.6 | 117.9 | 96.8 | 132.64 | 914.5 | 9.145 |
| 65 | 18.3 | 128.9 | 106.7 | 143.6 | 990.1 | 9.901 |
| 70 | 21.1 | 140.5 | 117.3 | 155.21 | 1070.1 | 10.701 |
| 75 | 23.9 | 152.8 | 128.5 | 167.51 | 1155.0 | 11.55 |
| 80 | 26.7 | 165.8 | 140.5 | 180.52 | 1244.7 | 12.447 |
| 85 | 29.4 | 179.6 | 153.2 | 194.27 | 1339.4 | 13.394 |
| 90 | 32.2 | 194.1 | 166.7 | 208.77 | 1439.4 | 14.394 |
| 95 | 35.0 | 209.4 | 181.0 | 224.06 | 1544.8 | 15.448 |
| 100 | 37.8 | 225.5 | 196.1 | 240.16 | 1655.9 | 16.559 |
| 105 | 40.6 | 242.4 | 212.1 | 257.11 | 1772.7 | 17.727 |
| 110 | 43.3 | 260.2 | 229.0 | 274.92 | 1895.5 | 18.955 |
| 115 | 46.1 | 278.9 | 246.9 | 293.63 | 2024.5 | 20.245 |
| 120 | 48.9 | 298.6 | 265.8 | 313.27 | 2159.9 | 21.599 |
| 125 | 51.7 | 319.2 | 285.7 | 333.86 | 2301.9 | 23.019 |
| 130 | 54.4 | 340.7 | 306.6 | 355.43 | 2450.6 | 24.506 |
| 135 | 57.2 | 363.3 | 329.4 | 378.03 | 2606.4 | 26.064 |
| 140 | 60.0 | 387.0 | 352.1 | 401.67 | 2769.4 | 27.694 |
| 145 | 62.8 | 411.7 | 376.7 | 426.4 | 2939.9 | 29.399 |
| 150 | 65.6 | 437.5 | 402.6 | 452.24 | 3118.1 | 31.181 |
| 155 | 68.3 | 464.5 | 429.9 | 479.23 | 3304.2 | 33.042 |
| 160 | 71.1 | 492.7 | 458.7 | 507.39 | 3498.3 | 34.983 |
| 165 | 73.9 | 522.0 | 489.1 | 536.74 | 3700.7 | 37.007 |
| 170 | 76.7 | 552.6 | 521.4 | 567.29 | 3911.3 | 39.113 |
| 175 | 79.4 | 584.3 | 555.6 | 598.98 | 4129.8 | 41.298 |
| 180 | 82.2 | 616.9 | — | 631.58 | 4354.6 | 43.546 |
Properties
| ASHRAE Designation | 407C |
| Safety Classification | A1 (non-flammable, low toxicity) |
| GWP (AR4, 100-yr) | 1774 |
| ODP | 0 |
| Molecular Weight | 86.2 g/mol |
| Boiling Point (1 atm) | -46.5°F / -43.6°C |
| Critical Temperature | 187.2°F / 86.2°C |
| Critical Pressure | 671.8 psia / 46.32 bar |
| Category | HFC Blend |
Common Applications
- Commercial AC
- Heat pumps
- R-22 retrofit
Frequently Asked Questions
What pressure should R-407C be at 70°F?
At 70°F, R-407C has a saturation pressure of 140.5 PSIG (155.2 PSIA), compared to R-22's 121.4 PSIG. R-407C operates at moderately higher pressures than R-22 across the temperature range.
Is R-407C a drop-in replacement for R-22?
R-407C is a near-drop-in retrofit for R-22 in split AC systems. It requires charging as a liquid to maintain blend composition, may need a Schrader valve change, and may require POE oil addition. Check manufacturer guidance before converting.
What is the temperature glide of R-407C?
R-407C has a temperature glide of about 10–12°F at typical evaporator conditions. Unlike a pure refrigerant, the liquid and vapor have different compositions during phase change. This means bubble and dew point temperatures differ — important for system analysis and leak repair.