Mitsubishi Electric PLA-A12BA4 Installation Manual page 4

3. Installing the indoor unit
3-17/32 3-15/16 3-15/16 3-17/32
13-25/32
Fig. 3-4
Ceiling
Rafter
Beam
Roof beam
Fig. 3-5
Fig. 3-6
Fig. 3-8
4
(inch)
120°
(inch)
Unit
Grille
Pillar
Use inserts rated at 100-150 kg,
220-331 lbs each (procure locally)
Suspension bolts M10 (3/8") (procure
locally)
Steel reinforcing rod
(inch)
Suspension bolt
Ceiling
Nut
Washer (with insulation)
Mounting plate
Washer (without insulation)
Check using the Installation gauge
Main unit
Ceiling
Gauge
Ceiling opening dimensions
Fig. 3-7
Main unit
Ceiling
Installation template (top of the
package)
Screw with washer (Accessory)
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 fi gure 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 fi gure.
When installing the branch ducts, be sure to insulate adequately. Otherwise
condensation and dripping may occur.
When installing the fresh air intake hole, be sure to remove the insulator P
that is pasted on the indoor unit.
A H
Branch duct hole ø150 mm, ø5-29/32 inch cut out hole
B I
Indoor unit ø175 mm, ø6-7/8 inch burring hole pitch
C J
Fresh air intake hole Fresh air intake hole diagram
D K
Drain pipe 3-ø2.8 mm, ø1/8 inch burring hole
E L
Refrigerant pipe ø125 mm, ø4-29/32 inch burring hole pitch
F M
Branch duct hole diagram ø100 mm, ø3-15/16 inch cut out hole
(view from either side) N
Ceiling
G O
14-ø2.8 mm, ø1/8 inch burring Detailed fi gure of removing the insulator
hole
P
Insulator
3.5. Suspension structure (Give site of suspension
strong structure) (Fig. 3-5)
• The ceiling work differs according to the construction of the building. Building
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 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, 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
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. Confi rming 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 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 (top of the package) can be used as a protective sheet to pre-
vent 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.