A technician recovers R-22 with an older recovery unit manufactured before November 15, 1993 from a system holding 250 pounds. What is the required evacuation level?
a.0 inches Hg vacuum
b.15 inches Hg vacuum
c.10 inches Hg vacuum
d.4 inches Hg vacuum
Explanation
Recovery equipment manufactured before November 15, 1993 has lower required evacuation levels. For a high-pressure appliance holding 200 pounds or more, that older equipment must reach 4 inches Hg vacuum. Appliances under 200 pounds with pre-1993 equipment need only 0 inches Hg (atmospheric).
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