Mitsumi electronic PLA-ABA Branch duct hole and fresh air intake hole Fig, Strong structure Fig

3. Installing the indoor unit

		(inch)
	120
7/32		120
*6-
3-17/32 3-15/16 3-15/16 3-17/32
3-15/16	5-1/8
70°	*6-3/32	*6-9/16
13-25/32
Fig. 3-4

3.4. Branch duct hole and fresh air intake hole (Fig. 3-4)

At the time of installation, use the duct holes (cut out) located at the positions shown in Fig3-4, as and when required.

•A fresh air intake hole for the optional multi function casement can also be made.

Note:

The figure marked with * in the drawing represent the dimensions of the main unit excluding those of the optional multi function casement.

When installing the optional multi function casement, add 135 mm, 5-5/16 inch to the dimensions marked on the figure.

When installing the branch ducts, be sure to insulate adequately. Otherwise condensation and dripping may occur.

Branch duct hole	14-ø2.8 mm, ø1/8 inch burring hole
Indoor unit	ø150 mm, ø5-29/32 inch cut out hole
Fresh air intake hole	ø175 mm, ø6-7/8 inch burring hole pitch
Drain pipe	Fresh air intake hole diagram
Refrigerant pipe	3-ø2.8 mm, ø1/8 inch burring hole
Branch duct hole diagram	ø125 mm, ø4-29/32 inch burring hole pitch
(view from either side)	ø100 mm, ø3-15/16 inch cut out hole
	Ceiling

3.5. Suspension structure (Give site of suspension

strong structure) (Fig. 3-5)

Unit

(inch)

• The ceiling work differs according to the construction of the building. Building

Grille

Pillar

	23-
	13/16
	-57/64
	31
Ceiling	Use inserts rated at 100-150 kg, 220
Rafter	-331 lbs each (procure locally)
Beam	Suspension bolts M10 (3/8") (procure
Roof beam	locally)
	Steel reinforcing rod

constructors 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 rein- forced 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 ceil- ing foundation for securing the ends of the ceiling board.

(4)When installing the indoor unit on a slanted ceiling, attach a pillar between the ceiling and the grille and set so that the unit is installed horizontally.

Wooden structures

•Use tie beams (single storied houses) or second floor 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, 35-7/16 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, 70-7/18 inch. The size of the suspension bolts should be ø10 (3/8"). (The bolts do not come with the unit.)

Ferro-concrete structures

	Min. 1-3/16
	9/64)
+3/16 0	(9-2
	-1/8
11/16	4

Fig. 3-6

Fig. 3-5

	Suspension bolt	(inch)
	Ceiling
	Nut
	Washer (with insulation)
	Mounting plate
	Washer (without insulation)
	Check using the Installation gauge
+3/16	0
A=11/16

Main unit

Ceiling

Gauge

Ceiling opening dimensions

Fig. 3-7

Main unit

Ceiling

Installation template (top of the package)

Screw with washer (Accessory)

Secure the suspension bolts using the method shown, or use steel or wooden hangers, etc. to install the suspension bolts.

3.6. Unit suspension procedures (Fig. 3-6)

Suspend the main unit as shown in the diagram.

Figures given in parentheses represent the dimensions in case of installing optional multi function casement.

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.

•Make sure that A is performed within 17-22 mm, 11/16 to 7/8 inch. Damage could result by failing to adhere to this range. (Fig. 3-7)

Caution:

Use the top half of the box as a protective cover to prevent dust or debris from getting inside the unit prior to installation of the decorative cover or when applying ceiling materials.

3.7. Confirming the position of main unit and tightening the suspension bolts (Fig. 3-8)

•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 confirm 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 (top of the package) 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 fin-

Fig. 3-8

ished.

*As for the details of fitting, refer to the instructions given on the Installation tem- plate.

4