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REQUIREMENT
Removing the cardboard for transportation
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.
Heat exchanger
Protection cardboard
for transportation
17-EN
– 9 –
Top cabinet
6
Drain piping
CAUTION
Condensate drain piping installation and material must comply with applicable codes and regulations for
the specific indoor installation.
The condensate drain piping must be insulated to prevent sweating. All material used in the plenum space above
the ceiling must comply with applicable codes and regulations. If the condensate drain exits the unit downward
(gravity flow) the slope and suspension methods used for the condensate drain piping must comply with applicable
codes and regulations.
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.
Restrict the length of the traversing drain pipe to 65'7" (20 m) or less. For a long pipe, provide support brackets
at intervals of 4'11" to 6'7" (1.5 to 2 m) to prevent flapping.
Install the collective piping as shown in the following figure.
Do not provide any air vents. Otherwise, the drain water will spout, causing water to leak.
Do not allow any force to be applied to the connection area with the drain pipe.
Support
As long as possible
4'11" to 6'7"
bracket
(Approx. 3.9" (100 mm))
(1.5 to 2 m)
(Collective
piping)
Insulation
Downward slope
1/100 or more
Pipe material, size and insulation
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The following materials for piping work and insulation process are locally procured.
Pipe material
Hard vinyl chloride pipe VP25 (Outer diameter 1.3" (32 mm))
Insulation
Foamed polyethylene foam, thickness: 0.4" (10 mm) or more
Arched shape
Downward slope
Trap
1/100 or more
VP30
Incorrect
18-EN
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