What happens if liquid enters the evaporator during the gas defrost process?

During the gas defrost process, the primary goal is to remove frost or ice buildup on the evaporator coils to ensure efficient heat transfer and maintain proper system operation. When liquid refrigerant enters the evaporator instead of being vaporized fully, it can lead to improper temperature regulation.

The presence of liquid in the evaporator during defrost can cause frosting on the coils because the liquid does not evaporate efficiently in the environment required for defrosting. The low temperatures within the evaporator, combined with the introduction of liquid refrigerant, can result in condensation and frost accumulation. This frost can then impede airflow, reduce heat exchange efficiency, and potentially lead to further operational issues.

Thus, the adverse effect of liquid entering the evaporator during this critical process is a tendency to create frosting on the coils, which disrupts the intended function of the defrost cycle. This is why the correct answer highlights the impact of liquid refrigerant on frost formation rather than discussing benefits or increased pressures in the system.