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4
Drain piping
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 dropping.
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.
Hard vinyl chloride pipe VP25
Piping
(Outer dia. : 32 mm)
Foam polyethylene:
Heat insulator
Thickness 10 mm or more
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.
Be sure to fix the soft end of the flexible hose with
the attached hose band.
Use the flexible hose on a horizontal level.
OK
NO GOOD
max
45°
max
45°
REQUIREMENT
Be sure to perform heat insulation of the drain
pipes of the indoor unit.
Never forget to perform heat insulation of the
connecting part with the indoor unit.
An incomplete heat insulation causes dew
dropping.
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.
1.5 m to 2 m
Support
bracket
1/100 or more
Heat insulator
downward
11-EN
For length of the traversing drain pipe, restrict to
20 m or less.
In case of a long pipe, provide support brackets
with interval of 1.5 to 2 m in order to prevent
waving.
Arched
shape
GOOD
Trap
Set the collective piping as shown in the below
figure.
As long as possible (10 cm)
VP25
VP25
VP30 or more
Downward slope
1/100 or more
Be sure not to 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,
be sure to use / fix the attached flexible hose with
the hose band, otherwise a damage or water leak
is caused on the drain pipe connecting port.
Attached hose
Drain pipe
band
connecting port
(Hard socket)
Attached flexible hose
Riser (Trap)
Soft socket
Hard socket
Adhesive inhibited:
90° Bend
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.
5 mm or less
10 to 12 mm
hose band tightening
margin
Drain pipe
connecting port
(Transparent)
10 mm
Flexible hose
Socket for VP25 vinyl
Heat
chloride pipe
(Accessory)
insulator
(Locally procured)
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
NO
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.
VP25
Drain up
When a down-gradient cannot be secured for the drain
pipe, drain-up piping is possible.
The height of the drain pipe must be 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 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.
VP25 vinyl chloride pipe
(Locally procured)
Socket for VP25
(Locally procured)
Indoor unit
VP25 vinyl chloride
pipe
(Locally procured)
– 6 –
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.
Be sure to check draining also when installed in
heating period.
Using a pitcher or hose, pour water (1500 to 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.
Heat
exchanger
Tool for
300 mm
pouring
or less
water
Bottle
Underside of ceiling
After the electric work has finished, pour water
during Cool mode operation.
If the electric work has not yet finished, pull out
the float switch connector (CN34: Red) from the
electrical control box, and check draining by plugging
the single phase 208-240V power to the terminal
blocks R(L) and S(N).
If doing so, the drain pump motor operates.
(Never apply 208-240V to Uv (U1), Uv (U2), A, B
otherwise a trouble of P.C. board occurs.)
Float switch
connector (3P)
(CN34: red)
Drain pan
Power
supply
wiring
S
R
Insert the hose end between the
heat exchanger and the drain pan,
and then bend the hose downward.
Water (1500 cc to 2000 cc)
12-EN
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