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The most cost-effective method of recovering refrigerant from a low-pressure chiller with more than 500 lbs of refrigerant and to meet EPA requirements is to recover the refrigerant using what protocol?
A) vapor recovery using a vacuum pump based recovery unit followed by liquid recovery using a liquid pump
B) recovery using a vacuum pump based vapor recovery machine only
C) recovery using a liquid pump only
D) liquid recovery using a liquid pump, followed by vapor recovery using a vacuum pump based recovery unit
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