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Use the interactive PT chart with calculator →R-438A Pressure Temperature Chart
Saturation pressure (PSIG) for R-438A (ISCEON MO99) at temperatures from -40°F to 120°F. A popular near drop-in replacement for R-22.
| Temp (°F) | Pressure (PSIG) |
|---|---|
| -40°F | -0.2 vac |
| -20°F | 14.2 |
| 0°F | 32.9 |
| 20°F | 56.5 |
| 40°F | 86.2 |
| 60°F | 123.2 |
| 80°F | 169.0 |
| 100°F | 225.0 |
| 120°F | 293.5 |
Frequently Asked Questions
What is the saturation pressure of R-438A at 40°F?
At 40°F, R-438A has a saturation pressure of 86.2 PSIG.
What is R-438A used for?
R-438A (also known as ISCEON MO99) is an HFC blend designed as a near drop-in replacement for R-22 in existing systems. It works with both mineral oil and POE oil, making retrofits simpler.
Can I use R-438A as a drop-in for R-22?
R-438A is one of the closest drop-in replacements for R-22 available. It can work with existing mineral oil in many cases, though POE oil is recommended for best performance. The system TXV may need adjustment, and a filter drier change is recommended during retrofit.