LG AMNH076LQL0 Service Manual page 71
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6. CST Type Indoor Unit
• 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.
Piping 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.
Drain test
The air conditioner uses a drain pump to drain water.
Use the following procedure to test the drain pump operation:
Feed water
Drain Pump
Drain pan
Pipe clamp
Maintenance
drain port
Flexible drain hose
(accessory)
Main
drain pipe
Drain
port
Glue the joint
Drain hose connection
Use the clip (accessory)
Indoor unit
• 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
finished.
• When the test is completed, connect the flexi-
ble drain hose to the drain port on the indoor
unit.
Installation
Upward
routing
not allowed
1/50~1/100
MAX 700mm
Service Manual 71
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Troubleshooting
