Service Manual
27
Installation
7. Drain Pipe Work
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Drain Piping of Ceiling Cassette
• 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(1.26inch).
• Be sure to install heat insulation on the drain piping.
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 operat-
ing 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(0.31inch).
Drain test
Maintenance
drain port
Upward
routing
not allowed
Pipe clamp
Indoor unit
Flexible drain hose
700mm
(27.6inch) or less
1 -1.5m(3.32-4.92ft)
300mm
(11.81inch) or less
Clamp metal(attached)
Drain hose(attached)
Drain raising pipe
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)
Flexible drain hose
CAUTION
The supplied flexible drain hose should not be curved,
neither screwed. The curved or screwed hose may
cause a leakage of water.
1/50~1/100
MAX 700mm
(27.6inch)
Flexible drain hose
Flexible drain hose
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Install the drain raising pipes at a right angle to the
indoor unit and no more than 300mm(11.81inch) from
the unit.
2. Tape the Pipings and Connecting cable from bot-
tom to top.
3. Form the pipings gathered by taping along the
exterior wall, and make the trap prevent water
from entering into the room.
4. Fix the pipings onto the wall by saddle or equiva-
lent.
In case of the Outdoor Unit being installed
above position of the Indoor Unit.
Seal a small opening
around the pipings
with gum type sealer.
Trap
