10. Installation
Indoor unit
20
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Ceiling Cassette 2-way
Indoor Units
10.5 Indoor Unit Drain Piping
• Drain piping must have down-slope (1/50 to 1/100): Make 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.
• Make sure to install heat insulation on the drain piping.
Piping material: Polyvinyl chloride pipe inner
diameter Ø 25mm 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 pip-
ing for leakage.
• Make 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.
Heat insulation material: Polyethylene foam with
thickness more than 8 mm.
Drain test
Maintenance
drain port
Upward
routing
not allowed
Pipe clamp
Indoor unit
1/50~1/100
MAX 700mm
Feed water
Drain Pump
Drain pan
Flexible drain hose
(accessory)
Main
drain pipe
Glue the joint
Drain
port
Drain hose connection
Use the clip (accessory)
1/50~1/100 slope
Hanger
distance
Hanger Bracket
Max 700mm
Flexible drain hose
Insulation
Metal
clamp
Max 300mm
1~15m
CAUTION
The supplied flexible drain hose should not be strained.
A strained hose may cause leakage of water.
