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Drain piping work

CAUTION

•

Following the Installation Manual, perform the
drain piping work so that water is properly
drained, and apply a heat insulation so as not to
cause a dew drop.
Inappropriate piping work may result in water
leakage in the room and wet of furniture.



Piping/Heat insulating material

Require the following materials for piping and heat
insulating at site.



Flexible hose

Use the attached flexible hose to adjust center
discrepancy of the hard vinyl chloride pipe or to adjust
the angle.
• Do not use the flexible hose as stretched, or do not

deform it more extent than that in the following figure.

• Fix the soft end of the flexible hose with the attached

hose band.

• Use the flexible hose on a horizontal level.

REQUIREMENT

• Perform heat insulation of the drain pipes of the indoor

unit.

• Perform heat insulation of the connecting part with the

indoor unit.
An incomplete heat insulation causes dew drop.

• Set the drain pipe with downward slope (1/100 or

more), and do not make swelling or trap on the piping.
It may cause an abnormal sound.

• For length of the traversing drain pipe, restrict to 65’7”

(20 m) or less.
In case of a long pipe, provide support brackets with
interval of 4’11” - 6’7” (1.5 - 2 m) in order to prevent
waving.

• Set the collective piping as shown in the below figure.

• Do not apply force to the connecting part of the drain

pipe.

• The hard vinyl-chloride pipe cannot be directly

connected to the drain pipe connecting port of the
indoor unit.
For connection with the drain pipe connecting port, fix
the attached flexible hose with the hose band,
otherwise a damage or water leak is caused on the
drain pipe connecting port.

Piping

Hard vinyl chloride pipe VP25

(Outer dia.: Ø1.3" (32 mm))

Heat insulator

Foam polyethylene:

Thickness 0.4" (10 mm) or more

NO GOOD

Max

45°

Max

45°

90° Bend

Riser (Trap)

Support

bracket

1/100 or more

downward

Heat insulator

4’11” - 6’7” (1.5 - 2 m)

Arched

shape

Trap

GOOD

VP25

As long as possible (3.9” (100 mm))

Downward slope

1/100 or more

VP30 or more

VP25



Connecting drain pipe

• Connect a hard socket (locally procured) to the hard

socket of the attached supplied flexible hose.

• Connect a drain pipe (locally procured) to the

connected hard socket.

REQUIREMENT

• Connect hard vinyl chloride pipes securely using an

adhesive for vinyl chloride to avoid water leakage.

• It takes some time until the adhesive is dried and

hardened (refer to the manual of the adhesive). Do not
apply stress to the joint with the drain pipe during this
time period.



Drain up

When a down-gradient cannot be secured for the
drainpipe, drain-up piping is possible.
• The height of the drain pipe must be 33.5" (850 mm)

or less from the bottom of the ceiling.

• Take the drain pipe out of the drain pipe joint with the

indoor unit in 11.8" (300 mm) or less, and bend up
the pipe vertically.

• Immediately after the pipe is bent up vertically, lay

the pipe making a down-gradient.

• Set downward grading immediately after raising up

vertically.



Check the draining

In the test run, check that water drain is properly
performed and water does not leak from the connecting
part of the pipes.
Check draining also when the unit is installed in heating
period.
By using a pitcher or hose, pour water (0.4 - 0.5 gal
(1500 - 2000 cc)) into the discharge port before
installation of the ceiling panel.
Pour water gradually so that water does not spread on
the motor of the drain pump.

CAUTION

Pour water gently so that it does not spread around
inside the indoor unit, which may cause a malfunction.

Adhesive inhibited:

Use the attached flexible hose and hose band for

connecting the drain hose to the clear drain socket.

If applying the adhesive, socket will be damaged and

cause water leakage.

Drain pipe

connecting port

(Hard socket)

VP25 vinyl chloride pipe

(locally procured)