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8. INSTALLING DRAIN PIPES
8.1A. Installing drain pipes
(Ceiling concealed type)
Use general hard polyvinyl chloride pipe and connect it with
adhesive (polyvinyl chloride) so that there is no leakage.
Always heat insulate the indoor side of the drain hose.
Use a drain pipe that matches the size of the drain hose
(Table A).
• Do not perform a rise, trap and air bleeding.
• Provide a downward gradient (1/100 or more).
• Provide supports when long pipes are installed.
• Use an insulation material as needed, to prevent the pipes
from freezing.
• Install the pipes in a way that allows for the removal of the
control box.
Table A
Pipe Size
Drain pipe
3/4 in. (O.D. 1-1/16 in.)
• CEILING CONCEALED TYPE (Use Drain Pump)
Outlet air
flow
Arrange the drain hose
lower than this port.
Drain hose
Trap
OK
NO GOOD
Drain cap
NO GOOD Rise
Air bleeding
Supporter
NO GOOD
1.5-2 m
(5'- 6' 6")
OK
8.1B. Installing drain pipes (Wall mounted
type/Floor standing concealed type)
NO GOOD
OK
NO GOOD
Rise
Trap
Drain
cap
CAUTION
• Drain pump cannot be used if it is installed in wall mounted
type/floor standing concealed type.
• Set “10.4.Jumper wire setting of Drainage function setting
(JM1)”.
• Be sure to connect the pipes for drainage without leakage.
• To avoid condensation and dripping, always insulate the
indoor drain pipe.
• Install the drain pipe with downward gradient (1/50 to
1/100) and so there are no rises or traps in the pipe.
• Use general hard polyvinyl chloride pipe [19 mm (3/4 in.)
O.D. 27 mm (1-1/16 in.)] and connect it with adhesive
(polyvinyl chloride) so that there is no leakage.
• When the pipe is long. Install supports.
• Do not perform air bleeding.
• Always heat insulate the indoor side of the drain pipe.
O.D.1-1/16 in.
(27 mm)
Horizontal or
upward gradient
Supporter
Gap of 1.5-2 m (5' - 6' 6")
Locally arranged pipe
Max.
300 mm (11-13/16 in.)
700 mm (27-9/16 in.) or less
Rise
Air bleeding
BAD
Trap
Observe the following procedures to construct centralized
drain pipe fittings.
O.D. 1-5/16 in. (33 mm) or more
Downward gradient 1/100 or more
700 mm
(27-9/16 in.)
or less
WARNING
Do not insert the drain piping into the sewer where sulfurous
gas occurs. (Heat exchange erosion may occur)
Insulate the parts properly so that water will not drip from the
connection parts.
Check for proper drainage after the construction by using the
visible portion of transparent drain port and the drain piping
final outlet on the body.
CAUTION
Do not apply adhesive agent on the drain port of the body.
(Use the attached drain hose and connect the drain piping)
