LG L5UC728FA0 Installation Manual page 17

Caution for gradient of unit and drain piping
Lay the drain hose with a downward inclination so water will drain out.
• Always lay the drain with downward
inclination (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.
CORRECT
• Install the P-Trap (or U-Trap) to prevent a
water leakage caused by the blocking of
intake air filter.
• Drill the piping hole with 70mm dia, hole
core drill.
• Piping hole should be slightly slant to the
outdoor side.
Unit
Make sure to be closed.
• Upward routing not
allowed
INCORRECT
A ≥ 70mm
B ≥ 2C
C ≥ 2 x SP
SP = External Pressure
(mmAq)
Ex) External Pressure
= 10mmAq
A ≥ 70mm
B ≥ 40mm
C ≥ 20mm
Applied U-Trap Dimension
Indoor
Installation of Indoor, Outdoor Unit
Thermal insulator
(Local supply)
Drainage pipe
(Local supply)
Drainage hole
C
U-Trap
A
WALL
Installation Manual 17
B
Outdoor
5~7mm