LG JRNU28GBGA4 Installation Manual page 11

1. Install declination of the indoor unit is very important for the drain
2. Minimum thickness of the insulation for the connecting pipe shall be 5mm.
• The unit must be horizontal or declined to the drain hose connected when finished
installation.
Drain Pump
unuse
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 32mm.
Piping material: Polyvinyl chloride pipe inner
diometes Ø 25mm 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
CAUTION
The supplied flexible drain hose should not be strained.
A strained hose may cause leakage of water.
CAUTION
Front of view
Ceiling
Drainage hole
Flexible drain hose
• Connect the main drain pipe to the exterior and leave it pro-
(accessory)
visionally until the test comes to an end.
Main
• Feed water to the flexible drain hose and check the piping
drain pipe
for leakage.
Drain
• Be sure to check the drain pump for normal operation and
port Glue the joint
noise when electrical wiring is complete.
Drain hose connection
• When the test is complete, connect the flexible drain hose to
Use the clip (accessory)
the drain port on the indoor unit.
of the duct type air conditioner.
Drain Pump
Drainage hole
use
Pipe clamp
Indoor unit
Maintenance
drain port
Installation
Upward
routing
not allowed
1/50~1/100
MAX 700mm
Hanger
distance
Hanger Bracket
Max 300mm
1~15m
1/50~1/100 slope
Metal
clamp
Flexible drain hose
Insulation
Installation Manual 11