When is the defrost cycle typically terminated?

The defrost cycle is typically terminated based on either temperature, pressure, or time because these factors ensure that the system effectively removes ice buildup on the evaporator coil, optimizing performance and efficiency.

Temperature is often monitored to ensure the coil reaches a certain threshold that indicates ice removal, while pressure can provide insight into refrigerant flow and system conditions. Time-based termination may also be utilized as a safeguard to prevent excessive operation of the defrost cycle, even if the ice hasn’t completely melted. This multi-faceted approach allows for a balance between efficient operation and the prevention of ice formation that could hinder system performance.

The other options do not provide a complete or operationally safe approach to terminating the defrost cycle. Relying solely on humidity levels may not accurately reflect the necessary conditions for effective defrosting. Terminating the cycle only when ice is visibly melted may lead to inefficient operation, as some residual ice might remain, refusing adequate airflow. Lastly, terminating after a set duration without regard to actual conditions could lead to unnecessary energy consumption or ineffective defrosting, resulting in potential issues down the line.