LG 1 Way Cassette ZTUQ12GULA1 Owner's Manual page 14

INSTALLATION
14
• Hanging bolt - W3/8 or M10
• Nut - W3/8 or M10
• Spring washer - M10
• Plate washer - M10
Drill the piping hole on the wall slightly tilted to
the outdoor side using a Ø70 hole core drill.
CAUTION
• Tighten the nut and bolt to prevent unit falling.
Indoor Unit Drain Piping
• Drain piping must have down-slope (1/50 to 1/
100): be sure not to provide up-and-down slope
to prevent reversal flow.
• During drain piping connection, be careful not to
exert extra force on the drain port on the indoor
unit.
• The outside diameter of the drain connection on
the indoor unit is 32 mm.
Piing material: Polyvinyl chloride pipe VP-25 and
pipe fittings.
• Be sure to install heat insulation on the drain
piping.
Heat insulation material: Polyethylene foam with
thickness more than 8 mm.
a Pipe clamp
Indoor unit
b
c Maintenance drain port
d Upward routing not allowed
Drain Test
The air conditioner uses a drain pump to drain
water.
Use the following procedure to test the drain pump
operation:
• Connect the main drain pipe to the exterior and
leave it provisionally until the test comes to an
end.
• Feed water to the flexible drain hose and check
the piping for leakage.
• Be sure to check the drain pump for normal
operation and noise when electrical wiring is
complete.
• When the test is complete, connect the flexible
drain hose to the drain port on the indoor unit.
Feed water
a
Drain pump
b