When recovering from a low-pressure chiller with a large charge, the most efficient practice is to:
a.Recover vapor only
b.Recover with the purge unit running
c.Recover only after adding nitrogen
d.Recover liquid first, then vapor
Explanation
Recovering liquid first moves the bulk of the charge quickly, then vapor recovery pulls the remaining refrigerant down to the required 25 mm Hg absolute. Recovering vapor alone is far slower on a large charge. The purge unit removes air but is not the recovery method.
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