Mitsubishi GL-Series units include a Dry Mode that is designed to remove moisture from the space the unit is installed in. This feature runs the unit at a low speed to remove moisture from the air. You may experience some cooling of the space while the unit is operating in Dry Mode.
Depending on how damp your space is, The system may not entirely eliminate the need for a dedicated dehumidifier, but it should help keep the space relatively dry in all but the most extreme conditions.