Drain Piping - LG ARNU05GL1G2 Installation Manual

1. Install declination of the indoor unit is very important for the drain of the duct type air conditioner.
2. Minimum thickness of the insulation for the connecting pipe shall be 19mm.
• The unit must be horizontal or declined to the drain hose connected when finished
installation.

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
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 thick-
ness 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
CAUTION
Front of view
Ceiling
Drain Pump use
Flexible drain hose
Main
drain pipe
Drain
port Glue the joint
Drain hose connection
Use the clip
Drainage hole
Pipe clamp
Indoor unit
Maintenance
drain port
• 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.
Installation Manual 13
Installation
Upward
routing
not allowed