When is the defrost cycle typically terminated?

The defrost cycle in refrigeration systems is typically terminated based on either temperature, pressure, or time to ensure effective removal of frost and prevent ice buildup on the evaporator coils.

Temperature is a critical factor because once the evaporator coils have reached a sufficient temperature that allows the frost or ice to melt away, the defrost cycle can be concluded. Pressure is also monitored as it can indicate if the refrigerant is operating within the correct parameters, signaling when it can return to normal operation.

Time is factored in to prevent the defrost cycle from running too long, especially if either temperature or pressure indicators are not met. The use of these various parameters ensures that the defrost process is efficient and does not occur longer than necessary, which is important for maintaining system efficiency.

Other choices do not capture the multifaceted criteria that govern the termination of the defrost cycle. For instance, fluid velocity alone does not provide enough context regarding the need to end a defrost cycle, as it does not directly relate to the goals of frost removal. Terminating based on compressor load alone does not account for the conditions that may still require defrosting. Lastly, the inactive state of the outdoor unit is not a definitive criterion for defrost termination since it