Final answer:
The oil safety control is a differential pressure switch that operates on the pressure within the oil line and the pressure within the compressor's crankcase, ensuring proper oil circulation and preventing compressor damage.
Step-by-step explanation:
The oil safety control operates on differential pressure, which means it uses the difference between two pressures to function. These pressures are typically the pressure within the oil line (output pressure) and the pressure within the compressor's crankcase (suction pressure). When the compressor is running, the oil pump creates higher pressure in the oil line. If the oil line's pressure drops too low in relation to the crankcase's pressure, it may indicate that there is not enough oil being circulated through the system. The differential pressure switch is configured to detect this drop in pressure difference and can shut off the compressor to prevent damage due to lack of lubrication.