40 CFR §82.152 classifies appliances by their refrigerant's liquid-phase saturation pressure at 104°F. Which range makes an appliance low-pressure?
Explanation
A low-pressure appliance uses a refrigerant with a saturation pressure below 45 psia at 104°F (R-11, R-123, R-113, R-245fa). (b) 45–170 psia is medium-pressure (R-12, R-134a, R-500); (c) 170–355 psia is high-pressure (R-22, R-407C, R-410A); (d) above 355 psia, or a critical temperature below 104°F, is very-high-pressure (R-13, R-23, R-503). Older guides describe the classes by boiling point, but the regulation uses these pressure bands, and the class decides which row of the evacuation table applies.
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