Gree GMV-ND36ZD/A-T Owner's Manual page 14

Ceiling type
4.1.3 Leveling
The water level test must be done after installing the indoor unit to make the unit is
horizontal, as shown below.
Note: Adjust the height of the unit to make the drain pipe slant slightly downward so that
the drainage will become much smoother.
Multi Variable Air Conditioners Floor and Ceiling Type Indoor Unit
Fig.4.1.2.3
Fig.4.1.3
10
Unit:mm