ProKlima GPC10AL Mode D'emploi page 47

Use the drainage option at the middle drainage port
The collected water can be automatically emptied from the middle drainage port into a floor drain
by attaching a hose with an inner diameter of 14 mm (not included).
Attention:
Place the air conditioner on a level surface, make sure the hose is clear of any obstructions and
pointing downward. Otherwise, not properly drained water might fill up the chassis and cause
the device to shut off. If that should occur, empty the water in the chassis and check location and
hose for proper setup.
Remove the cap from the drainage port by
turning it counter clockwise.
Remove the rubber stopper from the spout.
Screw the drain hose adapter to the port by
turning it clockwise.
Push the drainage hose on to the adapter and
secure it with a pipe hoop.