What is one of the most important aspects an operator must check before starting up a compressor?

One of the most important aspects an operator must check before starting up a compressor is ensuring that the oil levels are adequate. Proper oil levels are crucial for the lubrication of the compressor components. Insufficient oil can lead to increased friction, overheating, and ultimately, mechanical failure. Adequate oil not only lubricates the moving parts of the compressor but also helps in sealing, cooling, and removing contaminants. This preparation step is fundamental in maintaining the reliability and efficiency of the compressor system, minimizing the risk of breakdowns, and ensuring a smooth operational start-up.

In contrast, checking superheat on the suction primarily pertains to maintaining optimal refrigeration cycle efficiency and is more of an operational check rather than a pre-start requirement. Adjusting the evaporating metering device is generally done during operational tuning rather than as a startup step. Turning off condenser fans and water is not advisable as it could lead to temperature-related issues in the system, undermining the cooling effect needed when the compressor starts. Thus, verifying oil levels holds the most significance in preventing potential damage during the startup of a compressor.