LG MFL39817319 Installation Manual page 35

[Cealing Concealed Duct/Cealing Cassette Type]
• 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 32mm(1 1/4 inch).
Piping material: Polyvinyl chloride pipe inner
diometes Ø 25mm(1 inch) and pipe fittings
• Be sure to install heat insulation on the drain piping.
Heat insulation material: Polyethylene foam
with thickness more than 8mm(5/16 inch).
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
operating 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.
CAUTION : The supplied
flexible drain hose should not
be curved, neither screwed.
The curved or screwed hose
may cause a leakage of water.
❈ The figure can be changed according to model.
Pipe clamp
Indoor unit
Maintenance
drain port
Feed water
Drain Pump
Drain pan
Installation
Upward
routing
not allowed
1/50~1/100
MAX : 700 mm(27 9/16 inch)
Flexible drain hose
(accessory)
Main
drain pipe
Drain
port
Glue the joint
Drain hose connection
Use the clip (accessory)
Flexible drain hose Flexible drain hose Flexible drain hose
Flexible drain hose
1/50~1/100
Installation Manual 35