Nate Core Practice Test 2025 – 400 Free Practice Questions to Pass the Exam

The presence of ice buildup on evaporators is often attributed to insufficient airflow or low refrigerant charge. Insufficient airflow over the evaporator coils can prevent the heat exchange process from occurring effectively. When airflow is restricted, the refrigerant does not absorb enough heat, which can lead to lower temperatures on the coils. As a result, moisture in the air can condense and freeze, causing ice to accumulate.

Additionally, a low refrigerant charge can reduce the system's ability to absorb heat. A lack of refrigerant means there is less thermal energy being transferred, which can prevent the evaporator from reaching the desired temperature for efficient operation. This scenario can also lead to moisture freezing on the coils, contributing to ice buildup.

In contrast, other factors such as ambient temperature fluctuations and excessive humidity levels might impact the overall performance of a refrigeration system, but they are not as direct in causing ice accumulation on the evaporators as insufficient airflow or a low refrigerant charge.