R404A pressure–temperature chart
R404A is a zeotropic blend. Its normal boiling point is -45.5 °C; the critical pressure is 37.3 bar. At the AHRI 540 air-conditioning rating point — 7.2 °C evaporating, 54.4 °C condensing — the saturation pressures are 7.50 and 25.37 bar, a pressure ratio of 3.38. As a zeotropic blend it evaporates and condenses over a range of temperatures at one pressure — a glide of 0.5 K at 0.0 °C — so the dew line (where the last liquid boils off) and the bubble line (where the first vapour forms) are both tabulated. Superheat is measured up from the dew temperature and subcooling down from the bubble temperature; a map's 8.3 K of subcooling is 8.3 K under the bubble line, not the dew line, and this solver reads it so.
Units: SI · US customary
Saturation table, -70 to 70 °C
| Dew °C | Bubble °C | Glide K | kPa abs | bar abs | psig | hfg kJ/kg | ρ liquid kg/m³ | ρ vapour kg/m³ |
|---|---|---|---|---|---|---|---|---|
| -70 | -70.9 | 0.9 | 26.1 | 0.261 | -10.9 | 215.3 | 1378 | 1.54 |
| -65 | -65.9 | 0.9 | 35.5 | 0.355 | -9.5 | 212.2 | 1363 | 2.05 |
| -60 | -60.9 | 0.9 | 47.5 | 0.475 | -7.8 | 209.2 | 1348 | 2.69 |
| -55 | -55.8 | 0.8 | 62.5 | 0.625 | -5.6 | 206.0 | 1333 | 3.48 |
| -50 | -50.8 | 0.8 | 81.0 | 0.810 | -2.9 | 202.9 | 1318 | 4.44 |
| -45 | -45.7 | 0.7 | 103.7 | 1.037 | 0.3 | 199.7 | 1303 | 5.60 |
| -40 | -40.7 | 0.7 | 131.0 | 1.310 | 4.3 | 196.4 | 1287 | 6.99 |
| -35 | -35.7 | 0.7 | 163.6 | 1.636 | 9.0 | 193.0 | 1271 | 8.62 |
| -30 | -30.7 | 0.7 | 202.2 | 2.022 | 14.6 | 189.5 | 1255 | 10.55 |
| -25 | -25.6 | 0.6 | 247.5 | 2.475 | 21.2 | 185.9 | 1239 | 12.80 |
| -20 | -20.6 | 0.6 | 300.2 | 3.002 | 28.8 | 182.2 | 1222 | 15.41 |
| -15 | -15.6 | 0.6 | 361.0 | 3.610 | 37.7 | 178.3 | 1205 | 18.43 |
| -10 | -10.6 | 0.6 | 430.7 | 4.307 | 47.8 | 174.3 | 1187 | 21.90 |
| -5 | -5.5 | 0.5 | 510.2 | 5.102 | 59.3 | 170.2 | 1169 | 25.89 |
| 0 | -0.5 | 0.5 | 600.3 | 6.003 | 72.4 | 165.8 | 1150 | 30.46 |
| 5 | 4.5 | 0.5 | 701.8 | 7.018 | 87.1 | 161.3 | 1131 | 35.68 |
| 10 | 9.5 | 0.5 | 815.7 | 8.157 | 103.6 | 156.5 | 1110 | 41.65 |
| 15 | 14.5 | 0.5 | 942.9 | 9.429 | 122.1 | 151.4 | 1089 | 48.48 |
| 20 | 19.6 | 0.4 | 1084.4 | 10.844 | 142.6 | 146.0 | 1067 | 56.29 |
| 25 | 24.6 | 0.4 | 1241.3 | 12.413 | 165.3 | 140.3 | 1044 | 65.26 |
| 30 | 29.6 | 0.4 | 1414.5 | 14.145 | 190.5 | 134.1 | 1019 | 75.59 |
| 35 | 34.6 | 0.4 | 1605.3 | 16.053 | 218.1 | 127.5 | 993 | 87.57 |
| 40 | 39.7 | 0.3 | 1815.0 | 18.150 | 248.5 | 120.3 | 965 | 101.58 |
| 45 | 44.7 | 0.3 | 2044.8 | 20.448 | 281.9 | 112.4 | 934 | 118.15 |
| 50 | 49.7 | 0.3 | 2296.2 | 22.962 | 318.3 | 103.5 | 899 | 138.11 |
| 55 | 54.7 | 0.3 | 2571.0 | 25.710 | 358.2 | 93.3 | 860 | 162.79 |
| 60 | 59.8 | 0.2 | 2871.2 | 28.712 | 401.7 | 81.3 | 813 | 194.69 |
| 65 | 64.8 | 0.2 | 3200.0 | 32.000 | 449.4 | 65.9 | 754 | 239.58 |
| 70 | 69.9 | 0.1 | 3563.3 | 35.633 | 502.1 | 41.5 | 658 | 320.99 |
Pressures are absolute in kPa and bar, gauge in psig (at 101.325 kPa atmospheric); hfg is the latent heat of vaporisation at the dew pressure; densities are saturated liquid and saturated vapour. Computed with CoolProp 8.0.0, the open-source property library the solver runs on, sampled every 0.5 K and printed every 5 K — the same tables the builder reads when it solves a circuit on R404A.
R404A compressors in the catalog
1,596 compressor maps run on R404A, each a page with its AHRI 540 / EN 12900 map across the published envelope, and each selectable in the builder. Read any of them at your own evaporating and condensing temperatures →
- Copeland — 441 maps: ZB (73), ZF (61), CS (45), ZS (34), ZBD (29), YS (19), YF (17), CF (10), KCM (10), YFH (10), ZFH (10), RST (9)
- Danfoss — 467 maps: MLZ (206), MTZ (115), LLZ (61), NTZ (38), SZ (32), VLZ (8), VTZ (7)
- Tecumseh — 327 maps: AJ (77), FH (59), AE (54), AG (40), AWS (28), AGB (24), AJK (14), AHC (4), AKA (4), AL (4), AWA (4), HG (3)
- Invotech — 220 maps: YM (94), YF (92), YSF (26), YSM (8)
- Embraco — 141 maps: NT (42), NEK (30), NEU (25), NJ (13), EMT (8), NTU (8), EHU (5), VNEK (4), NJX (3), NTX (2)
The largest at the air-conditioning point
- Copeland ZB220KQE-TWD (R404A scroll, 60 Hz, MT) — 97.5 kW at 7.2 / 54.4 °C
- Copeland 6DBXR32ME-TSK (R404A Discus recip, 50 Hz, AC) — 87.4 kW at 7.2 / 54.4 °C
- Danfoss MLZ240T4 (R404A scroll, 50 Hz) — 82.1 kW at 7.2 / 54.4 °C
- Copeland ZB220KQE-TWD (R404A scroll, 50 Hz, MT) — 81.1 kW at 7.2 / 54.4 °C
- Copeland ZB190KQE-TWD (R404A scroll, 60 Hz, MT) — 79.3 kW at 7.2 / 54.4 °C
- Invotech YM410E1G-100 (R404A medium-temperature refrigeration scroll, 60 Hz, 460 V 3P) — 71.8 kW at 7.2 / 54.4 °C
- Danfoss MLZ200T4 (R404A scroll, 50 Hz) — 66.9 kW at 7.2 / 54.4 °C
- Copeland ZB190KQE-TWD (R404A scroll, 50 Hz, MT) — 65.7 kW at 7.2 / 54.4 °C
- Copeland ZB150KQE-TWD (R404A scroll, 60 Hz, MT) — 64.1 kW at 7.2 / 54.4 °C
- Invotech YM350E1G-100 (R404A medium-temperature refrigeration scroll, 60 Hz, 460 V 3P) — 61.3 kW at 7.2 / 54.4 °C
Open the R404A chart in the app — the pressure–temperature line drawn, readable at any point, with a compressor's envelope over it — or open the builder and draw a circuit on R404A: the solver finds its evaporating and condensing temperatures from the coils and the compressor's map.