The compressor used in a water-cooled air conditioning system is short cycling. A service check determines that the suction pressure remains above the normal cut-in point during cycling and that the discharge pressure rapidly builds up to the cut-out point while running and gradually falls to the cut-in point during the off cycle. What is likely the cause?

Correct Answer: Option D — reduction in condenser water flow (scaled condenser)

A scaled or fouled marine condenser restricts heat transfer, preventing proper refrigerant condensation. This causes high-side discharge pressure to rise rapidly toward the high-pressure cutout limit. Meanwhile, inadequate liquid subcooling and reduced liquid feed lead to compressor short cycling.