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4. Installing the indoor unit
A
B
25/32
H
D
Fig. 4-3
1
D Ceiling
E Rafter
F Beam
G Roof beam
Fig. 4-4
A
B
A Suspension bolt (Procure locally)
B Ceiling
C Nut (Procure locally)
D Washer (with insulation) (Accessory)
Fig. 4-5
D
22-11/16 to 24-1/32
Fig. 4-6
A
B
Fig. 4-7
C
5-1/2
F
120°
G
2-3/4
E
J
Duct fl ange connection
I
A Unit
B Grille
C Pillow
2
H Use inserts rated at 100-150 kg
(220-331 lbs) each (procure locally)
I Suspension bolts M10 (3/8") (procure
locally)
J Steel reinforcing rod
*B: Suspension bolt pitch (see Fig. 4-2 B for details)
A
C
D
E
F
C
G
B
E Mounting plate
F Washer (without insulation) (Accessory)
G Check using the Installation gauge
A Main unit
B Ceiling
C Gauge (Grille accessory)
D Ceiling opening dimensions
A Main unit
B Ceiling
C Installation template (Accessory)
C
4.3. Installation of duct (in case of fresh air intake)
(inch)
(Fig. 4-3)
Caution:
Linkage of duct fan and air conditioner
ln case that a duct fan is used, be sure to make it linked with the air conditioner
when outside air is taken.
Do not run the duct fan only. It can cause dew drop.
Making a duct fl ange (prepared locally)
• The shape of duct fl ange shown left is recommended.
Installation of duct fl ange
• Cut out the cutout hole. Do not knock it out.
• Install a duct fl ange to the cutout hole of the indoor unit with three 4 10 mm tapping
screws which should be prepared locally.
Installation of duct (should be prepared locally)
• Prepare a duct of which inner diameter fi ts into the outer diameter of the duct fl ange.
• In case that the environment above the ceiling is high temperature and high humidity,
wrap the duct in a heat insulate to avoid causing dew drop on the wall.
Remove the drain pan insulation.
A Duct fl ange recommended shape
(Thickness:0.8 mm (1/32 inch) or more)
B 3-ø5 mm (3/16 inch) hole
C Detail drawing of fresh air intake
D Indoor unit
E Ceiling surface
4.4. Suspension structure (Give site of suspension
strong structure) (Fig. 4-4)
• The ceiling work diff ers according to the construction of the building. Building con-
structors and interior decorators should be consulted for details.
(1) Extent of ceiling removal: The ceiling must be kept completely horizontal and the
ceiling foundation (framework: wooden slats and slat holders) must be reinforced
in order to protect the ceiling from vibration.
(2) Cut and remove the ceiling foundation.
(3) Reinforce the ends of the ceiling foundation where it has been cut and add ceiling
foundation for securing the ends of the ceiling board.
(4) When installing the unit on a slanting ceiling, interlock a pillow between the ceiling
and the grille and set so that the unit is installed horizontally.
1 Wooden structures
• Use tie beams (single-story houses) or second fl oor beams (two story houses) as
reinforcing members.
• Wooden beams for suspending air conditioners must be sturdy and their sides must
be at least 6 cm (2-3/8 inch) long if the beams are separated by not more than 90
cm (36 inch) and their sides must be at least 9 cm (3-9/16 inch) long if the beams
are separated by as much as 180 cm (71 inch). The size of the suspension bolts
should be ø10 (3/8"). (The bolts do not come with the unit.)
2 Ferroconcrete structures
Secure the suspension bolts using the method shown, or use steel or wooden hang-
ers, etc. to install the suspension bolts.
(inch)
4.5. Unit suspension procedures (Fig. 4-5)
Suspend the main unit as shown in the diagram.
1. In advance, set the parts onto the suspension bolts in the order of the washers
(with insulation), washers (without insulation) and nuts (double).
• Fit the washer with cushion so that the insulation faces downward.
• In case of using upper washers to suspend the main unit, the lower washers (with
insulation) and nuts (double) are to be set later.
2. Lift the unit to the proper height of the suspension bolts to insert the mounting
plate between washers and then fasten it securely.
3. When the main unit can not be aligned against the mounting hole on the ceiling,
it is adjustable owing to a slot provided on the mounting plate. (Fig. 4-6)
• Make sure that step A is performed within 37-42 mm (1-15/32 to 1-21/32 inch).
Damage could result by failing to adhere to this range.
4.6. Confi rming the position of main unit and tightening
the suspension bolts (Fig. 4-7)
• Using the gauge attached to the grille, ensure that the bottom of the main unit is
properly aligned with the opening of the ceiling. Be sure to confi rm this, otherwise
condensation may form and drip due to air leakage etc.
• Confi rm that the main unit is horizontally levelled, using a level or a vinyl tube fi lled
with water.
• After checking the position of the main unit, tighten the nuts of the suspension bolts
securely to fasten the main unit.
• The installation template can be used as a protective sheet to prevent dust from
entering the main unit when the grilles are left unattached for a while or when the
ceiling materials are to be lined after installation of the unit is fi nished.
* As for the details of fi tting, refer to the instructions given on the Installation template.
F 3-Tapping screw hole
G ø73.4 mm (2-7/8 inch) cutout hole
H Duct fl ange (Prepared locally)
I 4 10 mm Tapping screw
(Prepared locally)
J Insulation
4
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