R-404A History. R-404A rose to prominence in the late 1990's with the phasing out of CFC and HCFC refrigerants like R-12 and R-502. There had to be a replacement for the Ozone damaging refrigerants of the past and the successor was the HFC R-404A that we all know of today. 404A's reign however was short lived.. R404A Suction and Discharge Pressure Low Pressure (Suction Pressure) Evaporator Temperature: -20 degrees Celsius (-4 degrees Fahrenheit) Absolute Pressure: 45.276 PSI; Gauge Pressure: 30.376 PSI; The low pressure, also known as the suction pressure, is crucial for maintaining the evaporator temperature within the cold room. It is essential for.
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In order to have the coolers temp at 34. While the system is running, the refrigerant temp in the evap would generally be at 24, so 32 suction pressure while running. The liquid line pressure would also need to be higher then the saturation temp of the outdoor ambient, so liquid line pressure would be at least 254.. R-404A is a refrigerant commonly used in commercial freezers. The normal operating pressure for R-404A in a freezer at a temperature of 70 degrees Fahrenheit and a suction temperature of 30 degrees Fahrenheit would be around 9.6 psi. The low pressure should be 18-20 psi while the high pressure should be around 200 psi.
