11. Installation
40
• Do not give the hose an upward gradient beyond
the connection port. This will cause water to flow
backwards when the unit is stopped, resulting in
water leaks.
• Do not apply force to the piping on the unit side
when connecting the drain hose. The hose should
not be allowed to hang loose from its connection to
the unit. Fasten the hose to a wall, frame or other
support as close to the unit as possible.
Ceiling
Support pieces
1 to 1.5 m
Slope of the horizontal drain pipe:
1/100 or more
Indoor unit
Be horizontal
Flexible hose
• Max. allowable aixs gap
• Max. allowable bending angle
NOTE
• If a concentrated drain pipe is installed, refer to the
figure below.
Centralized horizontal drain pipe
(more than 1/100 slope)
Main drain pipe
Full thread bolt hanger
1000 to 1500 mm
300 to
550 mm
200 mm
or more
Individual
air vent
Main air vent
(must be installed)
• If 3 or more units are installed, install the main air
vent at the front of the farthest indoor unit from the
main drain pipe.
• To prevent water from flowing back to indoor units,
install an individual air vent at the top of each indoor
unit.
- The air vents should be T or 7 shaped to prevent
dust or foreign substances from entering.
- You may not need to install air vent if the
horizontal drain pipe is in proper slope.
Wind-Free 1Way Cassette
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