Which condition is likely to increase compressor wear?

Liquid slugging is a condition that occurs when liquid refrigerant enters the compressor during its operation, which is primarily designed to compress gas. Compressors are engineered to handle gases, and when liquid enters, it can cause a variety of mechanical issues. The presence of liquid refrigerant in the compression chamber can lead to hydraulic locking, where the liquid doesn’t compress like a gas, placing excessive strain on the compressor components. This strain increases wear on the compressor's internal parts, such as the bearings and piston, which can lead to premature failure.

In contrast, low ambient temperature typically can lead to more efficient operation as the refrigerant can condense more effectively; high vapor pressure refers to the conditions under which the refrigerant vaporizes, which can actually be favorable in certain circumstances; and an excess of lubricating oil might create more lubrication but is not as detrimental as liquid slugging, which directly compromises the compressor's core function.