Mitsubishi Electric Mr Slim PLA-RP-AA Installation Manual page 4

3. Installing the indoor unit
C
B
A
E
D
F
90 100
J
Fig. 3-3
A
C
B
1
F G
D
E
D Ceiling
E Rafter
F Beam
G Roof beam
Fig. 3-4
A
B
A
C
D
E
Min. 30
F
C
G
B
Fig. 3-5
A
B
D
Fig. 3-7
4
K
L
M
120°
A
N
O
G
100 90
H
I
350
A Unit
B Grille
C Pillar
2
J
H
I
H Use inserts rated at 100-150 kg
each (procure locally)
I Suspension bolts M10 (3/8") (procure
locally)
J Steel reinforcing rod
A Suspension bolt
B Ceiling
C Nut
D Washer (with insulation)
E Mounting plate
F Washer (without insulation)
G Check using the Installation gauge
A
B
D
C
A Main unit
B Ceiling
C Gauge
D Ceiling opening dimensions
Fig. 3-6
A Main unit
B Ceiling
C Installation template (top of the
C
package)
D Screw with washer (Accessory)
3.3. Branch duct hole and fresh air intake hole (Fig. 3-3)
At the time of installation, use the duct holes (cut out) located at the positions shown
in following diagram, 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 to the di-
mensions marked on the figure.
When installing the branch ducts, be sure to insulate adequately. Otherwise
condensation and dripping may occur.
A Branch duct hole
B Indoor unit
C Fresh air intake hole
D Drain pipe
E Refrigerant pipe
F Branch duct hole diagram (view from
either side)
G Cut out hole
H 14-ø2.8 burring hole
3.4. Suspension structure (Give site of suspension
strong structure) (Fig. 3-4)
• The ceiling work differs 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 indoor unit on a slanting ceiling, attach a pillar between the
ceiling and the grille and set so that the unit is installed horizontally.
1 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 long if the beams are separated by not more than 90 cm and
their sides must be at least 9 cm long if the beams are separated by as much as
180 cm. The size of the suspension bolts should be ø10 (3/8"). (The bolts do not
come with the unit.)
2 Ferro-concrete structures
Secure the suspension bolts using the method shown, or use steel or wooden hang-
ers, etc. to install the suspension bolts.
3.5. Unit suspension procedures (Fig. 3-5)
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 step A is performed within 17-22 mm. Damage could result by
failing to adhere to this range. (Fig. 3-6)
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 ap-
plying ceiling materials.
3.6. Confirming the position of main unit and tighten-
ing the suspension bolts (Fig. 3-7)
• 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 confirm this, otherwise
condensation may form and drip due to air leakage etc.
• Confirm that the main unit is horizontally levelled, using a level or a vinyl tube filled
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 finished.
* As for the details of fitting, refer to the instructions given on the Installation template.
I ø150 cut out hole
J ø175 burring hole pitch
K Fresh air intake hole diagram
L 3-ø2.8 burring hole
M ø125 burring hole pitch
N ø100 cut out hole
O Ceiling