The purge unit on a centrifugal system takes its suction from the top of the condenser, which is essential for removing non-condensable gases and maintaining system efficiency. Other options like the compressor oil sump, top of the evaporator, and suction elbow do not serve this function. Proper suction point selection is crucial for optimal refrigeration cycle performance. ;
The purge unit on a centrifugal refrigeration system takes its suction from the top of the condenser to efficiently remove non-condensable gases. This is important for maintaining optimal system performance and preventing pressure build-up. Therefore, the correct answer is option A: Top of the condenser.
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