How does the evaporator coil usually operate when using a manual shutdown defrost system?

When using a manual shutdown defrost system, the evaporator coil typically operates below 32 degrees Fahrenheit. In refrigeration systems, especially those designed for low-temperature applications, the evaporator coil absorbs heat from the surrounding environment to facilitate cooling. When temperatures are below freezing, frost or ice can accumulate on the coil, which can impede its efficiency.

A manual shutdown defrost system is utilized to address this issue. It involves turning off the refrigeration system, allowing the ice buildup to melt and ensuring that the evaporator coil can operate effectively after the defrost cycle. Therefore, having the evaporator coil operating below the freezing point is normal as it is during these conditions that frost accumulation occurs, necessitating the defrosting process to maintain optimal functioning of the refrigeration system.