LG B30AWYN762 Installation Manual page 10

Installation of Indoor, Outdoor Unit
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 10mm.
• The unit must be declined to the drain hose connected when finished installation.
CORRECT
Drainage hole
CAUTION FOR GRADIENT OF
UNIT AND DRAIN PIPING
1. Main drain
• Always lay the drain with downward inclination
(1/50 to 1/100).
Prevent any upward flow or reverse flow in any part.
• 10mm 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.
2. Safety drain
• There is no need to
provide a trap for the
safty drain. If the
safty drain pipe is
connected to the
main drain pipe,
make the connection
below the trap on the
main drain pipe.
10 Ceiling Concealed Duct Air Conditioner
CAUTION
Ceiling
INCORRECT
Safety drain pipe
Drainage hole
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
Main drain pipe
A ≥ 70mm
B ≥ 2C
C ≥ 2 x SP
SP = External
Ex) External Pressure = 10mmAq
Safety drain hole Main drain hole
Thermal insulator
(Local supply)
Drainage pipe
(Local supply)
Drainage hole
C
A
Pressure
(mmAq)
A ≥ 70mm
B ≥ 40mm
C ≥ 20mm
B
U-Trap