–22–
Feed water
Drain Pump
D i
Flexible drain hose
(accessory)
Main
drain pipe
Glue the joint
Drain
port
Drain hose connection
Use the clip (accessory)
Maintenance
drain port
Upward
routing
not allowed
Pipe clamp
Indoor unit
Cool air leakage
(no good)
Decorative panel
Air conditioner
unit
Ceiling
board
Fit the insulator (this part) and
be careful for cool air leakage
Decorative panel
Air conditioner
unit
Ceiling
board
Good example
Bad example
1/50~1/100
MAX 700mm
CAUTION
Piping material: Polyvinyl chloride pipe VP-25
and pipe fittings
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 flexi-
ble drain hose to the drain port on the indoor
unit.
Heat insulation material: Polyethylene foam with
thickness more than 8 mm.
8. Indoor Unit Drain Piping
Drain test
Install certainly the decorative panel.
Cool air leakage causes sweating.
Water drops fall.
• 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.
• Be sure to execute heat insulation on the drain piping.
