Checking The Drainage And Pipe Forming - LG HPWI-C20E Service Manual

5. Checking the Drainage and Pipe forming

(1) Checking the Drainage
1) Room Type Indoor Unit
1. Remove the Grille from the cabinet
• Set the up-and-down air direction louver to
open position(horizontally) by finger pressure.
• Remove the securing screws.
• To remove the Grille, pull lower the left and
right side of the grille toward you (slightly tilted)
and lift it straight upward.
2. Check the drainage
• Pour a glass of water on the evaporator.
• Ensure if water flows drain hose of indoor unit
without any leakage.
2) Cassette 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 execute 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:
• 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.
Pull the right and
the left side.
Pipe clamp
Indoor unit
Maintenance
drain port
Feed water
Drain Pump
Drain pan
- 73 -
Screw
Upward
routing
not allowed
Flexible drain hose
(accessory)
Main
drain pipe
Drain
port Glue the joint
Drain hose connection
Use the clip (accessory)