15 ■English
Indoor Unit Installation
10. Duct work
Pay the utmost attention to the following items and conduct the duct work.
• Check that the duct is not in excess of the setting range of external static pressure for the unit. (Refer to the technical
datasheet for the setting range.)
• Attach a canvas duct each to the air outlet and air inlet so that the vibration of the equipment will not be transmitted to
the duct or ceiling.
Use a sound-absorbing material (insulation material) for the lining of the duct and apply vibration insulation rubber to
the suspension bolts.
• At the time of duct welding, perform the curing of the duct so that the sputter will not come in contact with the drain pan
for the lter.
• If the metal duct passes through a metal lath, wire lath, or plate of a wooden structure, separate the duct and wall
electrically.
• Be sure to heat insulate the duct for the prevention of dew condensation. (Material: Glass wool or styrene foam;
Thickness: 1 inch (25mm))
• Be sure to attach the eld supply air lter to the air inlet of the unit or eld supply inlet in the air passage on the air
suction side. (Be sure to select an air lter with a duct collection efciency of 50 weight percent.)
• Explain the operation and washing methods of the locally procured components (i.e., the air lter, air inlet grille, and air
outlet grille) to the user.
• Locate the air outlet grille on the indoor side for the prevention of drafts in a position where indirect contact with people.
• The air conditioner incorporates a function to adjust the fan to rated speed automatically. (Field settings)
Therefore, do not use booster fans midway in the duct.
Connection method of ducts on air inlet and outlet sides.
• Connect the eld supply duct in alignment with the inner side of the ange.
• Connect the ange and unit with the
C
duct ange connection screw.
• Wrap aluminium tape around the ange and duct joint in order to prevent air leakage.
• Do not create air outlets in multiple rooms for 1 unit.
C
C
Unit
Insulation material
(field supply)
Canvas duct
(field supply)
Flange on air inlet side
(provided with the unit)
Insulation material
(field supply)
Air inlet
Air outlet
Duct flange connection screws
Flange on air outlet side
(provided with the unit)
Duct flange connection screws
CAUTION
Connect the ange and unit with the
C
duct ange connection screw regardless of whether the duct is connected to the air
inlet side.
01_EN_3P674701-1B.indd 15 2022/06/02 10:06:27
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