20 _ 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
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