A technician is recovering R-11 from a low-pressure centrifugal chiller for a tear-down. To what evacuation level must the appliance be recovered?
a.15 psig
b.10 inches Hg vacuum
c.4 inches Hg vacuum
d.25 mm Hg absolute
Explanation
Low-pressure appliances must be evacuated to 25 mm Hg absolute, a deep vacuum roughly equal to 29 inches of mercury vacuum. This level is the same whether the recovery equipment was made before or after November 15, 1993. The inches-of-mercury figures apply to high-pressure systems, not low-pressure chillers.
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