What is the primary function of the soft start in a gas defrost?

The primary function of the soft start in a gas defrost is to slowly equalize the evaporator to the defrost pressure. This gradual approach helps to manage the transition from a refrigeration mode to a defrost mode, ensuring that the evaporator does not experience sudden changes in pressure or temperature.

This controlled change helps minimize thermal shock to the system and prevents potential damage to the evaporator coils. By allowing the system to equalize slowly, it effectively enhances the efficiency of the defrost process, ensuring that the heat exchange occurs smoothly and that the moisture accumulated on the evaporator surfaces can be removed effectively. The other options focus on different aspects of the defrost process, but they do not capture the essential role of the soft start in promoting a safe and effective transition to defrost pressures.