LG ABNQ18GM1A0 Installation Manual page 11

! CAUTION
• Install declination of the indoor unit is very
important for the drain of the duct type air
conditioner.
• Minimum thickness of the thermal insulator
for the connecting pipe shall be 5 mm.
• The unit must be horizontal or declined to
the drain hose connected when finished
installation.
Ceiling
Drain pump unuse
Ceiling
Drain pump use
Caution for gradient of unit and
drain piping
Lay the drain hose with a downward inclina-
tion so water will drain out.
- Always lay the drain with downward inclina-
tion (1/50 to 1/100). Prevent any upward flow
or reverse flow in any part.
- 5 mm or thicker formed thermal insulator
shall always be provided for the drain pipe.
Unit
Make sure to be closed.
1~3 mm
Drain hole
Drain hole
Thermal insulator
(Local supply)
Drain pipe
(Local supply)
Drain hole
INSTALLATION OF INDOOR
- Upward routing not allowed
CORRECT
INCORRECT
- Install the P-Trap (or U-Trap) to prevent a
water leakage caused by the blocking of in-
take air filter.
A 70 mm
B 2C
C 2 x SP
SP = External static pressure
(mmAq)
Ex) External static pressure
= 10 mmAq
A 70 mm
B 40 mm
C 20 mm
11
B
C
U-Trap
A