Dry Mode: There are two versions of this and Chillwell 2.0 Erfahrungsberichte To understand this you have to understand how AC works.

AC "Condenses" water From the air on the cold portion of the AC.

Dry Mode can be two things.

A De-humidifier mode designed to dry the air in a room or building

Dry the interior workings of the AC to prevent mold and mildew inside.