LG AB-W3067SA3, Installation Manual

Page: 10 / 37

10
THE INDOOR UNIT INSTALLATION
ENGLISH
Caution for gradient of unit and
drain piping
Lay the drain hose with a downward inclina-
tion so water will drain out.
Main drain
- Always lay the drain with downward inclina-
tion (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.
- Install the P-Trap (or U-Trap) to prevent a
water leakage caused by the blocking of
intake air filter.
- Upward routing not allowed
Safety drain
- There is no need to provide a trap for the
safty drain. If the safty drain pipe is connect-
ed to the main drain pipe, make the connec-
tion below the trap on the main drain pipe.
- Drill the piping hole with 70mm dia, hole
core drill.
- Piping hole should be slightly slant to the
outdoor side.
CORRECT
U-Trap
B
C
A 70mm
B 2C
C 2 x SP
SP = External
Pressure
(mmAq)
Ex) External Pressure = 10mmAq
A 70mm
B 40mm
C 20mm
A
Safety drain pipe
Main drain pipe
Drainage hole Make sure to be closed.
Unit
Drainage pipe
(Local supply)
Thermal insulator
(Local supply)
Applied U-Trap Dimension
5~7mm
Indoor Outdoor
WALL