Question 137Refrigeration & AC - QMED

70% to pass

As shown in the illustrated flow diagram for a self-contained recovery unit designed for the recovery of refrigerants from high-pressure appliances as defined by the EPA Clean Air Act rules, what is the functional purpose of the item labeled "FS2"? Illustration GS-RA-32

Diagram for USCG Refrigeration QMED: As shown in the illustrated flow diagram for a self-contained recovery unit...
AIt automatically shuts down the recovery unit compressor when the recovery cylinder becomes 80% full.
BIt automatically transitions the recovery unit from the direct liquid recovery mode to the direct vapor recovery mode.
CIt automatically shuts down the recovery unit compressor when the discharge pressure becomes excessive.
DIt automatically shuts down the recovery unit compressor when the refrigeration system has reached a depth of 15" Hg.
AI Explanation

The correct answer is B) It automatically transitions the recovery unit from the direct liquid recovery mode to the direct vapor recovery mode. The purpose of the item labeled "FS2" in the illustrated flow diagram is to automatically switch the recovery unit from liquid recovery mode to vapor recovery mode as the refrigerant is being transferred from the high-pressure appliance. This transition is necessary to ensure the recovery process is conducted safely and efficiently, as per the EPA Clean Air Act regulations governing the recovery of refrigerants. The other answer choices are incorrect because they do not accurately describe the functional purpose of FS2 in this specific recovery unit design. The unit does not have a mechanism to automatically shut down the compressor based on the recovery cylinder fill level, discharge pressure, or vacuum depth.

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Official Resources
46 CFR Machinery & Electrical 46 CFR Engineering USCG National Maritime Center
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