Panasonic WH-ADF0309J3E5CM Service Manual page 103

12.1.3.3.2 Vertical Installation
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To prevent overturning, fasten the unit to the wall securely.
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Check to make sure the wall can endure 5 times of weight of the unit. Ensure to fix the unit.
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In order to suppress vibrations, provide the spacer between the unit and the wall.
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Fasten the hanging brackets and bolts using by the hexagon nuts and washers.
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Check to make sure the unit is installed in a horizontal position by using a level.
Water leakage may occur if the unit is not installed horizontally.
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