What component is designed to prevent liquid refrigerant from returning to the compressor?

The correct response is the suction line accumulator, as its primary function is to hold excess liquid refrigerant that might otherwise flow back into the compressor. By doing so, it ensures that only vapor refrigerant enters the compressor, which is crucial for maintaining a proper operating environment and preventing any damage to the compressor that could happen if liquid refrigerant were to enter.

When refrigerant circulates through a cooling system, it changes state between liquid and vapor. If too much liquid refrigerant returns to the compressor, it can lead to what is known as liquid slugging. The suction line accumulator captures this excess liquid refrigerant, allowing it to vaporize before it reaches the compressor. This mechanism is vital because it protects the compressor's mechanical components, ensuring efficient operation and extending the lifespan of the system.

In contrast, the other components listed perform different roles. A liquid receiver stores liquid refrigerant and ensures a steady supply to the expansion devices, a thermal expansion valve regulates the flow of refrigerant into the evaporator based on temperature and pressure changes, and a discharge line filter removes debris from the refrigerant before it returns to the compressor. While these components play essential roles in the refrigeration cycle, they do not specifically prevent liquid refrigerant from reaching the compressor in the