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4
DRAIN PIPING WORK
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 dewing.
• 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 20m or less.
In case of a long pipe, provide support brackets with interval of
1.5 to 2m in order to prevent waving.
• Set the collective piping as shown
in the right figure.
• Do not mount an air purge pipe,
otherwise drain water spouts
out resulted in water leak.
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.
Inappropriate piping work may result in
water leakage in the room and wet of
furniture.
Pipe material/Insulator and size
The following materials for piping work and insulating
process are procured locally.
Pipe material
Insulator
Hard vinyl chloride pipe VP25
(Outer diameter Ø32mm)
Foamed polyethylene foam, thickness:
10mm or more
Trap
Arched
shape
Support
bracket
1/100 or more
downward
Heat
insulator
1.5m to 2m
As long as possible (10cm)
VP30 or more
Downward slope
1/100 or more
VP25
VP25
VP25
(Collective pipes)
Installation of accessories
Install the drain pan (accessory) on the pipe side of
the indoor unit.
Drain pan (accessory)
Cut the insulation, insert the protrusion
on the drain pan into the hole, and
then install it by pushing it in the
directions indicated by the arrows.
Insulation
Drain pan
Drain hose
Use adhesive for hard polyvinyl chloride pipe
Elbow
Hard polyvinyl chloride pipe
Drain filter
Piping
Hard polyvinyl chloride pipe ;
nominal dia. (inner dia.) : Ø20mm
Heat
Vesicant polyethylene :
insulator
Thickness ; 6mm or more
Piping and Insulation
For piping work and thermal insulating, arrange the
following materials at the local site.
CAUTION
Sometimes, debris will accumulate in the drain pan
while installation work
is in progress. Remove the drain filter from the
drain pan and clean it.
After cleaning the drain filter, replace it in the drain
pan.
Check the draining
After drain piping work, check that water drain is
properly performed and water does not leak from the
connecting part of the pipes.
