Are 134A and 404A Refrigerants Interchangeable?2020-09-24
Both types of presses use synthetic oil, which is fine. However, the characteristics of R134Ag and R40A are still quite different. The operating pressure of R404 is much higher than that of R134A. The same 50 degree condensing temperature R404A pressure is 22.9Bar, R134A pressure is 13bar. The cooling capacity per unit volume of R404A is less than that of R134A, about 1.4 times. In other words, if your system compressor does not change, after replacing the original R134A with R404A, the compressor displacement remains unchanged, but the cooling capacity is 40% larger, so the original two units are too small, so the system is Can not work normally. Conversely, if the original R404A is replaced by R134A, the cooling capacity is about 60%, and the system can operate without major safety issues.