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Insulation process
As shown in the figure, cover the flexible hose and hose band with the attached insulation up to the bottom
of the indoor unit tightly.
Cover the drain pipe tightly with an insulation procured locally so that it overlaps with the attached insulation
of the drain connecting section.
Wrap the attached insulation tightly from
the surface of the indoor unit.
Insulation of the drain
connecting section
(accessory)
21-EN
– 11 –
Insulation
(locally procured)
7
Duct design
CAUTION
Be sure to apply insulation to the duct to prevent dewy condition.
If there is an incomplete duct work, the water leakage into the room may happen.
REQUIREMENT
• In order to prevent short circuits, design the duct work so that the intake and discharge openings are not
adjacent to each other.
• Install the fi lter chamber on the intake side of the indoor unit. Attach the long life prefi lter and high-effi ciency
fi lter to the fi lter chamber to remove dust. Send outside air to the inside of the indoor unit and the area being
air conditioned.
• If no air fi lter is installed, dust will collect in the heat exchanger, which may cause the air conditioner to fail or
to leak.
• Be sure to set the duct at air intake side with descending inclination because the suction duct of the this unit is
exposed to outdoors and therefore rainwater, leaves and birds are easy to enter in if it is set horizontally.
Attaching wire netting and others to end of the suction duct is also recommended.
• Connect the duct so that the air intake sucks outside air only.
Be sure to apply insulation for the duct to prevent dewing.
(Recommended material: Glass wool or foam polyethylene, Thickness: 1.0" (25 mm))
• When welding the duct at the site, sparks may enter in the air fi lter or insulation.
To avoid spread of the fi re, cover the duct with iron plate, etc.
• When penetrating metal lath, wire lath or metal plank with the metal duct, isolate the duct from the wall
electrically.
• Set the canvas ducts at air intake port and air supply port. It is to avoid conveyance of vibration, abnormal
resonance sound and also to make easy the disassembly of the main unit in service time.
• Connect the ducts so that the ducts do not weight on the main unit.
If connecting the ducts directly to the main unit, the duct vibration abnormal sound from the main unit may
happen, and also the fi lter and service panel cannot be detached.
Be sure to fi x the ducts by using the hanging bolts.
•
22-EN
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