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 RA-0032
• Float switches (FS) vs pressure switches (PS) in the legend and where they are installed in the diagram • The difference between protecting the recovery cylinder vs protecting the compressor/accumulator • How the system would know when to change from liquid recovery to vapor recovery
• Look at where FS2 is physically located in the flow diagram. What component is it inside, and what is that component’s job during recovery? • Compare FS2 with FS1 on the recovery cylinder. Which option in the answers sounds more like the job of FS1 instead of FS2? • Which of the answers describe a function that would more likely use a pressure switch (PS1 or PS2) instead of a float switch?
• Identify from the legend that FS = Float Switch and PS = Pressure Switch, and match that to each answer choice. • Trace the piping around the accumulator tank and FS2 to see what happens if the liquid level gets too high or too low there. • Confirm which control (FS1, FS2, PS1, PS2) would reasonably be tied to an 80% full recovery cylinder and which would be tied to reaching 15" Hg vacuum.
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