A very-high-pressure appliance using R-13 must have its refrigerant recovered before service. Using recovery equipment made after November 15, 1993, what is the required evacuation level?

解析

For very-high-pressure appliances (R-13, R-23, R-503), 40 CFR §82.156 Table 1 requires 0 inches Hg (atmospheric) whether the recovery equipment was made before or after November 15, 1993. These refrigerants are so high-pressure that reaching atmospheric already removes most of the charge. 10 inches Hg is for high-pressure appliances of 200 pounds or more and medium-pressure ones under 200; 15 inches Hg is for medium-pressure appliances of 200 pounds or more; 25 mm Hg absolute is the low-pressure level.