In the illustrated R-134a high pressure...

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Question 1 of 205eccef9dbacbc34ba4d45f16

In the illustrated R-134a high pressure centrifugal chiller refrigerant flow circuit, what is the functional purpose of the refrigerant flowing as seen through the moisture indicator (item #3)? functions as a cooling medium for the hermetically sealed compressor drive motor functions as a cooling medium for the lubricating oil See illustration GS-RA-26.

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🔍 Key Concepts

• Follow the piping from the moisture indicator (#3) to see exactly which components that particular liquid refrigerant stream passes through • Typical hermetic centrifugal chiller motor cooling uses liquid refrigerant bled from the condenser to cool the motor before returning to the evaporator or suction line • Typical oil cooling circuits may use refrigerant as a cooling medium, but the oil cooler is usually a clearly labeled separate heat exchanger

💭 Think About

• From item #3, trace the line: does that refrigerant path go into the motor housing, the oil cooler, or both before it returns to the system? • Look for where the oil cooler is drawn and labeled—does the piping from #3 actually enter that component, or does the oil cooler appear to be on a different circuit? • If the refrigerant from #3 were cooling both the motor and the lubricating oil, what kind of branching or series flow would you expect to see on the diagram?

✅ Before You Answer

• Verify every component number that lies on the refrigerant line leaving #3 and match those numbers to the legend on your exam sheet • Confirm whether the oil cooler symbol (and its item number) is directly connected to the same refrigerant line as #3, or if it has a separate supply • Make sure you distinguish between refrigerant-cooled components and those cooled by water or another medium in the illustration before choosing your answer

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