LG UB85W.N94R0 Installation Manual page 10

The indoor unit installation
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 5 mm.
• The unit must be declined to the drain hose connected when finished installation.
CORRECT
CAUTION FOR GRADIENT
OF UNIT AND DRAIN PIPING
• Always lay the drain with downward
inclination (15 mm ~ 25 mm).
Prevent any upward flow or reverse flow
in any part.
• 10 mm 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.
10
!
CAUTION
Front of view
Drainage hole
Ceiling
INCORRECT
Lay the drain hose with a downward
inclination so water will drain out.
Unit
Make sure to be closed.
• Upward routing not
allowed
INCORRECT
Applied U-Trap Dimension
≥
A 70 mm
≥
B 2C
≥
C 2 x SP
SP = External Pressure
(mmAq)
Ex) External Pressure
= 10 mmAq
≥
A 70 mm
≥
B 40 mm
≥
C 20 mm
Drainage hole
Thermal insulator
(Local supply)
Drainage pipe
(Local supply)
Drainage hole
C
A
B
U-Trap