LB-D1860HL — LG Air Conditioner Service Manual (repair manual). Page 4

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–21–
Ceiling
CAUTION
1~3mm
Drainage hole
Drainage hole
Make sure to be closed.
Unit
Drainage pipe
(Local supply)
Thermal insulator
(Local supply)
Drainage hole
Front of view
CAUTION FOR GRADIENT OF
UNIT AND DRAIN PIPING
Lay the drain hose with a downward inclination
so water will drain out.
• Alway lay the drain with downward inclina-
tion (1/50 to 1/100). 
Prevent any upward flow or reverse flow in
any part.
• 5mm or thicker formed thermal insulator
shall always be provided for the drain pipe.
1. Install declination of the indoor unit is very important for the drain of the duct type air conditioner.
2. Minimum thickness of the insulation for the connecting pipe shall be 5mm.
• The unit must be horizontal or declined to the drain hose connected when finished installation.
CORRECT
CORRECT
INCORRECT
INCORRECT
• Upward routing not
allowed
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