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Installation Procedure
Step 10 Installing the drain hose and
drain pipe
1 Connect the flexible hose to the drain hose port.
• Make sure that a rubber ring is installed on the drain
hose port.
• The drain hose port location differs depending on the
unit types.
Drain hose
2 Cover the flexible hose with the provided insulation.
Indoor
unit
3 Field installed drain lines should be kept as short as
possible.
4 Insulate the whole drain pipe inside the building
(field supply).
The whole drain pipe must be insulated with 0.2 inch
(5mm) (or more) insulation to prevent condensation.
16
English
Drain hose port
Drain hose
Reducer
Drain insulation
CAUTION
Check that the indoor unit is level with the ceiling by
using by using a level.
• If the slope of the drain pipe is less than 1/100, be sure
to install an air vent at the top of each indoor unit to
prevent water from flowing back to the unit.
– If the slope of the drain pipe is 1/100 or more and
it is free from backward flow to the indoor unit, you
are not required to install an air vent.
• If it is necessary to increase the height of the drain
pipe, install a horizontal drain pipe that is 12 inches or
less (305 mm) from the drain hose port. If it is raised
higher than 19.69 inch (500 mm), there may be water
leaks.
Unit:inch(mm)
Band joint
• 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.
Under gradient
Air ventilation
Ceiling
11.81 inch
(300 mm)
or less 0.79 inch (20 mm)
or more
1/100 or more
Drain hose
Ceiling
Ceiling
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