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5
Drain piping
CAUTION
Following the Installation Manual, perform the drain piping work so that water is properly drained. Apply a
heat insulation so as not to cause a dew condensation.
Inappropriate piping work may result in water leakage in the room and wet furniture.
y
Provide the indoor drain piping with proper heat insulation.
y
Provide the area where the pipe connects to the indoor unit with proper heat insulation. Improper heat insulation
will cause condensation to form.
y
The drain pipe must be sloping downward (at an angle of 1/100 or more), and do not run the pipe up and down
(arched shape) or allow it to form traps. Doing so may cause abnormal sounds.
y
Restrict the length of the traversing drain pipe to 20 meters or less. For a long pipe, provide support brackets at
intervals of 1.5 to 2 meters to prevent
fl
apping.
y
Install the collective piping as shown in the following
fi
gure.
y
Do not provide any air vents. Otherwise, the drain water will spout, causing water to leak.
y
Do not allow any force to be applied to the connection area with the drain pipe.
Heat insulator
Downward slope
1/50 to 1/100 or
more
Support
bracket
As long as possible
VP-30
Arched shape
Trap
Incorrect
Downward slope
1/50 to 1/100
1.5 to 2 m
Pipe material, size and insulator
The following materials for piping work and insulating process are locally procured.
Pipe material
Hard vinyl chloride pipe VP25 (Nominal outer diameter Ø32 mm)
Insulator
Foamed polyethylene foam, thickness: 10 mm or more
REQUIREMENT
Removing the cardboard for transportation
y
Make sure to remove the protection cardboard for transportation that is inserted in the gap between the top
cabinet and the heat exchanger before installing the indoor unit.
Top cabinet
Heat exchanger
Protection cardboard
for transportation
