As shown in the illustrated flow diagram for...

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Question 1 of 205eccef9dbacbc34ba4d4610a

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, which of the labeled devices acts to automatically transition the recovery unit from the direct liquid recovery mode to the direct vapor recovery mode? See illustration GS-RA-32.

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🔍 Key Concepts

• Operation of direct liquid recovery versus direct vapor recovery in a refrigerant recovery unit • The functional difference between a float switch (FS) and a pressure switch (PS) in a flow diagram • How the accumulator tank and recovery cylinder are used during different recovery modes

💭 Think About

• Look at which component must know when the incoming refrigerant is no longer mostly liquid but has changed to mostly vapor. Would this be better detected by liquid level or by pressure? • Trace the refrigerant path in liquid mode from the system, through the accumulator and compressor, to the recovery cylinder. At what point in that path would an automatic switchover device need to be located? • Compare the labeled switches: which ones are monitoring pressure in lines, and which ones are monitoring liquid level in vessels, and how would each type of signal be used to change modes?

✅ Before You Answer

• Identify on the diagram where FS1 and FS2 are located (which vessel each one is mounted on) and think about which vessel’s level would tell you that liquid recovery is essentially complete. • Identify where PS1 and PS2 connect into the piping and whether they appear on the suction/accumulator side or the discharge/liquid line side—ask yourself if this seems more like a safety cutout or a mode-control device. • Before choosing, verify which label is attached to the device that would sense a drop in liquid level in the part of the system that first receives liquid from the system being serviced, since that is what triggers the need to shift to vapor recovery.

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