When the air conditioner is cooled in the summer, due to the high indoor temperature and high humidity, when the temperature of the air contacting the heat exchanger surface is low, the moisture in the hot air condenses on the surface of the heat exchanger, and more and more water is present. Finally, through the sump, the drain is discharged to the outside.
When the air conditioner is turned off, the surface of the heat exchanger is still wet. In the case of moisture, it increases the mold and the like of the bacteria and corrodes the surface of the heat exchanger. Therefore, many air conditioners that do not have a drying function generate an odor after opening, which is caused by moisture and mold.
Therefore, in order to prevent this from happening in a humid heat exchanger, some air conditioners have increased the drying function, or automatically enter the drying mode after cooling off, and continue to fan the fan to dry the internal heat exchanger.
Therefore, the "dry" function of the air conditioner is to dry the surface of the heat exchanger and prevent water from being distributed to the mold.