What defines a very high-pressure appliance in terms of liquid phase saturation pressure at 104°F?

A very high-pressure appliance is specifically defined by its saturation pressure in the liquid phase at a temperature of 104°F. For a refrigerant to be categorized as very high pressure, it must exhibit a saturation pressure above 355 psia at this temperature. This classification is essential for understanding the operating characteristics and safety requirements for handling such refrigerants.

Refrigerants that fall within the defined range of 170 psia to 355 psia would be classified as high-pressure appliances, and those below 45 psia would not be classified as high-pressure at all. This distinction is crucial for technicians when selecting proper recovery equipment and adhering to safety protocols during servicing and maintenance activities. Understanding these pressure classifications helps ensure compliance with EPA regulations and promotes safe handling of refrigerants in various systems.