Question 127Refrigeration/AC - QMED70% to pass
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?
AI Explanation
The correct answer is D) liquid recovery using a liquid pump, followed by vapor recovery using a vacuum pump based recovery unit.
This is the most cost-effective method to recover refrigerant from a low-pressure chiller with more than 500 lbs of refrigerant and meet EPA requirements. The EPA requires the use of a liquid pump to recover the liquid refrigerant first, followed by a vacuum pump based recovery unit to recover the remaining vapor refrigerant. This two-step process ensures the maximum amount of refrigerant is recovered, which is the most cost-effective approach compared to using only a vapor recovery unit or a liquid pump alone.
The other options are incorrect because they do not fully comply with EPA regulations for large refrigerant recovery operations. Option A is less efficient than the required two-step process, while options B and C do not utilize both liquid and vapor recovery methods as required.
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