Which aspect does the crankcase heater specifically address during the on-cycle?

The crankcase heater is specifically designed to prevent refrigerant migration during the on-cycle. When a refrigeration system is not operating, particularly during off-cycles, refrigerant can migrate away from the compressor and into the evaporator or other low-pressure areas. This can lead to difficulties when the system restarts, as the compressor may attempt to start with liquid refrigerant present, which can cause damage or inefficiency.

By warming the crankcase, the heater keeps the refrigerant in a gaseous state, ensuring that the compressor has a proper charge of vapor to start with. This enhances compressor reliability, reduces the risk of liquid slugging, and helps maintain the efficiency of the refrigeration cycle.

The other aspects mentioned, such as managing high compressor superheat, avoiding liquid flooding, and controlling operational pressures, are important in the overall operation of a refrigeration system, but they are not the primary function of the crankcase heater during the on-cycle. The focus here is specifically on safeguarding the compressor from the adverse effects of refrigerant migration.