Mitsubishi Electric CITY MULTI PLFY-P Serie Manuel D'installation page 4

2. Installing the indoor unit
1
Ceiling
D
Rafter
E
Beam
F
Roof beam
G
*B: Suspension bolt pitch (see Fig. 2-2
Fig. 2-4
Suspension bolt (Procure locally)
A
Ceiling
B
Nut (Procure locally)
C
Washer (with insulation) (Accessory)
D
Fig. 2-5
22-11/16 to 24-1/32
D
Fig. 2-6
Fig. 2-7
4
Unit
A
Grille
B
Pillow
C
2
Use inserts rated at 100-150 kg
H
(220-331 lbs) each (procure locally)
Suspension bolts M10 (3/8") (procure
I
locally)
Steel reinforcing rod
J
for details)
B
(inch)
Min.1-3/16
Mounting plate
E
Washer (without insulation) (Accessory)
F
Check using the Installation gauge
G
Main unit
A
Ceiling
B
Gauge (Grille accessory)
C
Ceiling opening dimensions
D
Main unit
A
Ceiling
B
Installation template (Accessory)
C
2.4. Suspension structure (Give site of suspension
strong structure) (Fig. 2-4)
• 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 unit on a slanting ceiling, interlock a pillow between the ceiling
and the grille and set so that the unit is installed horizontally.
Wooden structures
1
• 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 (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.)
Ferro-concrete structures
2
Secure the suspension bolts using the method shown, or use steel or wooden hang-
ers, etc. to install the suspension bolts.
2.5. Unit suspension procedures (Fig. 2-5)
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. 2-6)
• Make sure that step A is performed within 37 to 42 mm (1-15/32 to 1-21/32 inch).
Damage could result by failing to adhere to this range.
2.6. Confirming the position of main unit and tightening
the suspension bolts (Fig. 2-7)
• 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 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 tem-
plate.