5
Drain piping
Following the Installation Manual, perform the drain piping work so that water is properly drained.
Apply a heat insulation so as not to cause a dew condensation.
Inappropriate piping work may result in water leakage in the room and wet furniture.
• Provide the indoor drain piping with proper heat insulation.
• Provide the area where the pipe connects to the indoor unit with proper heat insulation. Improper heat insulation
will cause condensation to form.
• The drain pipe must be sloping downward (at an angle of 1/100 or more), and do not run the pipe up and down
(arched shape) or allow it to form traps. Doing so may cause abnormal sounds.
• Restrict the length of the traversing drain pipe to 65'7" (20 m) or less. For a long pipe, provide support
brackets at intervals of 4'9" (1.5 m) to 6'6" (2 m) to prevent flapping.
• Install the collective piping as shown in the following figure.
• Do not provide any air vents. Otherwise, the drain water will spout, causing water to leak.
• Do not allow any force to be applied to the connection area with the drain pipe.
• A hard PVC pipe cannot be connected to the drain pipe connecting port of the indoor unit. Be absolutely sure to
use the flexible hose provided for the connections with the drain pipe connecting port.
• Adhesive agents cannot be used for the drain pipe connecting port (hard socket) of the indoor unit. Be absolutely
sure to secure the pipe using the hose bands provided. Use of an adhesive agent may damage the drain pipe
connecting port or cause water to leak.
CAUTION
Drain pipe
connecting port
(hard socket)
Attached
hose band
Adhesive
agent
prohibited
Soft
socket
Soft
socket
VP 20 Polyvinyl
chloride pipe
(locally procured)
Attached drain hose
4'9" (1.5 m) to 6'6" (2 m)
Drain pan
Downward slope
1/100 or more
As long as possible
(Approx. 3.9" (10 cm))
Downward slope
1/100 or more
VP30
Incorrect
Trap
Arched shape
Support
bracket
(Collective
piping)
Heat
insulator
Attached hose band
Pipe material, size and insulator
Connection of drain hose
Connecting drain pipe
Drain up
Heat insulating process
The following materials for piping work and insulating process are procured locally.
• Insert the attached drain hose into the drain pipe connecting port on the drain pan up to the end.
• Fit the attached hose band to the end of the pipe connecting port, and then tighten it securely.
Connect the hard vinyl chloride pipe (locally procured) to the mounted drain hose which
was attached. When Plug is detached, the drain pipe is not damaged. It causes the water
leak.
In case of taking pipe from the left side
In case of taking pipe from the left side, exchange the plug from left to right.
Push in the plug of which end is not sharp up to the end.
• Fix the drain hose with the attached hose band, and set the
tightening position upward.
• As the draining is the natural water draining, arrange the pipe
outside of the unit on the down slope.
• If piping is performed as shown in the figure, drain cannot be
discharged.
When a down-gradient cannot be secured for the drain pipe, drain-up piping is possible.
• The height of the drain pipe must be 23.6" (600 mm) or less from the underside of the indoor unit.
• When Drain Pump Kit (sold separately) is installed, drain pipe and refrigerant pipe can only be connected from
upper direction.
• Using the attached drain hose heat insulator, lap the connecting section and the drain hose without clearance,
and then tighten with two handing band so that heat insulator does not open.
• Covering the attached drain hose heat insulator, lap the heat insulator (locally procured) to the drain pipe without
clearance.
REQUIREMENT
NO GOOD
Drain pipe
Drain pan
0.4" (10 mm)
to 0.6" (15 mm)
0.4" (10 mm)
to 0.6" (15 mm)
Drain pan
Confirm that soft hose is pushed in up to the end of the drain pan.
Attached drain hose
Drain pipe
Drain pipe Plug
Refrigerant pipe
Fit the attached hose band to the end of the
hose, lay down the knob, and then tighten hose
band.
* Fasten the binding bands in such a manner as to not
squeeze the attached insulating material excessively.
* Tighten the banding band so that attached
heat insulator is not pushed excessively.
Lap covering connecting section
between drain pan and drain hose. Heat insulator
(locally procured)
Hose band
Drain hose
Banding band
Attached heat insulator
Hose band
Drain
pan
Lap the attached
heat insulation so
that the one end is
put on the other end
at the upper side.
Fit the attached hose band to the end
of the hose, with both of the two knobs
oriented sideways.
Pipe material
Hard vinyl chloride pipe VP20 (Nominal outer diameter 1.1" (26 mm))
Insulator
Foamed polyethylene foam, thickness: 0.4" (10 mm) or more
� 12 �
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