Nate Electrical Practice Exam

Which two pressures does the compressor oil safety control operate on?

1. Oil pump pressure and suction pressure

2. Oil pump pressure and discharge pressure

3. Suction pressure and discharge pressure

4. Oil pressure and atmospheric pressure

The correct answer is: Oil pump pressure and suction pressure

The compressor oil safety control operates primarily on oil pump pressure and suction pressure. This mechanism is crucial for ensuring that the compressor maintains optimal operation and prevents damage due to inadequate lubrication. Oil pump pressure is critical because it indicates that the oil is being circulated effectively throughout the compressor system. If the oil pressure drops below a certain threshold, it may suggest that lubrication is insufficient, which can lead to component wear or even catastrophic failure. Suction pressure, on the other hand, reflects the low-pressure side of the compressor. It indicates the state of the refrigerant entering the compressor. A significant drop in suction pressure could point to issues like blockages or low refrigerant levels, which also impacts the compressor’s ability to operate efficiently and safely. By monitoring both oil pump pressure and suction pressure, the oil safety control ensures that the compressor is operating within safe parameters. If either pressure falls below acceptable levels, the control can act to prevent damage, thereby extending the lifespan of the compressor and maintaining system efficiency. Understanding the important roles of these pressures highlights why the identification of oil pump pressure and suction pressure is vital in maintaining compressor safety and performance.