LG B70AWYN985 Installation Manual page 17

Caution for gradient of unit and
drainage pipe
Lay the drainage pipe hose with a downward
inclination so water will drain out.
Main drain
- Always lay the drainage with downward incli-
nation (0.8 ˚ to 1.3 ˚).
Prevent any upward flow or reverse flow in
any part.
- 10mm or thicker formed thermal insulator
shall always be provided for the drainage
pipe.
Unit
Make sure to be closed.
- Install the P-Trap (or U-Trap) to prevent a
water leakage caused by the blocking of
intake air filter.
Unit
Make sure to be closed.
- Upward routing not allowed
Thermal insulator
(Local supply)
Drainage pipe
(Local supply)
Drainage hole
Thermal insulator
(Local supply)
Drainage pipe
(Local supply)
Drainage hole
PRODUCT INSTALLATION
Safety drainage
- There is no need to provide a trap for the
safety drainage. If the safety drainage pipe is
connected to the main drainage pipe, make
the connection below the trap on the main
drainage pipe.
Safety
drainage pipe
Applied U-Trap Dimension
C
A 70mm
A
B 2C
C 2 x SP
SP = External
Pressure
(mmAq)
Ex) External Pressure = 10mmAq
A 70mm
B 40mm
C 20mm
- Drill the pipe hole with 65mm dia, hole core
drill.
- Pipe hole should be slightly slant to the out-
door side.
WALL
Indoor
17
Main
drainage pipe
B
U-Trap
Outdoor
5~7mm