🔍 Key Concepts

• Low-pressure cutout controls that prevent compressor operation at low suction pressure • Effect of refrigerant charge level on suction pressure and compressor starting • How mechanical internal faults (valves, rings) affect running efficiency vs. starting ability

💭 Think About

• Think about which condition would keep the safety/control circuit from allowing the compressor to start even though the box is warm • Which option would most directly cause the suction pressure to be too low for the low-pressure control to close? • Which of the mechanical problems listed would mainly reduce capacity/efficiency rather than prevent the motor from starting at all?

✅ Before You Answer

• Identify which choice would lower suction pressure enough to keep a low-pressure cutout open • Decide which faults would more likely show up as poor cooling while running instead of a total failure to start • Verify that the condition you choose is one that a pressure-operated control could actually sense and react to