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5
Drain piping
CAUTION
Following the Installation Manual, perform the
drain piping work so that water is properly
drained, and apply an 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 / Insulation
Require the following materials for piping and insulation
at site.
Hard vinyl chloride pipe VP25
Piping
(Outer dia. : Ø1.1/4 (32 mm)
Foam polyethylene :
Insulation
Thickness 0.4 (10 mm) or more
Flexible hose
Use the attached flexible hose to adjust centre
discrepancy of the hard vinyl chloride pipe or to adjust
the angle.
Do not stretch the flexible hose. Do not deform the
hose more than what is shown 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
Riser (Trap)
max
45°
90° Bend
max
45°
REQUIREMENT
Be sure to perform insulation of the drain pipes of
the indoor unit.
Never forget to perform insulation of the connecting
part with the indoor unit.
An incomplete 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
Support
bracket
1/100 or more
Insulation
downward
21-EN
For length of the traversing drain pipe, restrict to
In case of a long pipe, provide support brackets
1
order to prevent waving.
Arched
shape
NO
GOOD
Trap
Set the collective piping as shown in the below
figure.
As long as possible 3.9 (10 cm)
VP25
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
VP25 vinyl chloride pipe
Drain pipe
band
(Locally procured)
connecting port
(Hard socket)
Attached flexible hose
Socket for VP25
Soft socket
(Locally procured)
Hard socket
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.
0.2 (5 mm) or less
0.4 to 0.5 (10 mm to 12 mm)
hose band tightening
margin
Drain pipe
connecting port
(Transparent)
VP25 vinyl chloride
pipe
(Locally procured)
0.4 (10 mm)
Flexible hose
Socket for VP25 vinyl
Insulation
chloride pipe
(Accessory)
(Locally procured)
– 11 –
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 drain
pipe, drain-up piping is possible.
The height of the drain pipe must be 19.7 (500 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.
11.8 (300 mm)
or less
Indoor unit
Underside of ceiling
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 (1.5 L to 2 L
(1/3 to 0.5 gallon)) into the suction 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
Drain pan
Power
supply
wiring
Tool for
pouring water
Insert the hose end
between the heat
Float switch
Bottle
exchanger and
connector (3P)
the drain pan, and
(CN34: red)
then bend the hose
downward.
Water (1.5 L to 2 L (1/3 to 0.5 gallon))
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 208/230V power to the terminal
blocks L1 and L2.
If doing so, the drain pump motor operates.
(Never apply 208/230V to
,
, A or B, otherwise
U
U
1
2
a trouble of P.C. Board occurs.)
22-EN
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