Gree Split Air Conditioner Owner's Manual page 24

Install outdoor unit
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Leak hunting
Use soap water or leak hunting meter to check whether
the joints is leak.
Outdoor condensation drainage (Heat pump type only)
When the unit is heating, the condensing water
and defrosting water can be drained out reliably
through the drain hose.
Installation: Install the outdoor drain elbow in
Ø 25 hole on the base plate, and joint the
drain hose to the elbow, so that the wastewater
formed in the outdoor unit can be drained out
to a proper place.
Indoor unit check point
Outdoor unit check point
Fig.6
Chasis
Outdoor drain
elbow