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SMMS Compact 4-way Cassette
5
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
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.
Hard vinyl chloride pipe VP25
Piping
(Outer dia.: Ø32 mm)
Foam polyethylene:
Heat insulator
Thickness 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 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.
OK
NO GOOD
Riser (Trap)
Max
45°
Max
45°
90° Bend
17-EN
Installation Manual
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 20 m
or less.
In case of a long pipe, provide support brackets with
interval of 1.5 - 2 m in order to prevent waving.
Support
1.5 - 2 m
bracket
1/100 or more
Heat insulator
downward
Arched
NO
shape
GOOD
Trap
• Set the collective piping as shown in the below figure.
As long as possible (100 mm)
VP25
VP25
VP25
VP30 or more
Downward slope
1/100 or more
• 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.
SMMS Compact 4-way Cassette
– 9 –
Attached hose
VP25 vinyl chloride pipe
Drain pipe
band
(To be local procure)
connecting port
(Hard socket)
Attached flexible hose
Socket for VP25
Soft socket
(To be local procure)
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.
Align the attached hose band to
the end of hose, set the
tightening position upward, and
Drain pipe
then tighten it.
connecting port
(Transparent)
VP25 vinyl chloride
Flexible hose
pipe (To be local
(Accessory)
procure)
Socket for VP25 vinyl chloride pipe
(To be local procure)
Connecting drain pipe
• Connect a hard socket (procured locally) to the hard
socket of the attached supplied flexible hose.
• Connect a drain pipe (procured locally) 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.
Installation Manual
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 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.
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.
Check draining also when installed in heating period.
By using a pitcher or hose, pour water (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.
18-EN
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