Mitsubishi Electric S Series Manual page 28

CEILING CASSETTE
4. Installing the indoor unit
20
Fig. 4-3
Ceiling
Rafter
Beam
Roof beam
*B: Suspension bolt pitch (see Fig. 4-2
Fig. 4-4
Fig. 4-5
Fig. 4-6
Fig. 4-7
B-28
(mm)
25
70
Unit
Grille
Pillow
Use inserts rated at 100-150kg
each (procure locally)
Suspension bolts M10(3/8") (procure
locally)
Steel reinforcing rod
for details)
Min. 30
Mounting plate
Washer (without insulation) (Accessory)
Check using the Installation gauge
Main unit
Ceiling
Gauge (Grille accessory)
Ceiling opening dimensions
Main unit
Ceiling
Installation template (Accessory)
Screw with washer (Accessory)
4.3. Installation of duct (in case of fresh air intake)
(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 flange (prepared locally)
• The shape of duct flange shown left is recommended.
Installation of duct flange
• Cut out the cutout hole. Do not knock it out.
• Install a duct flange to the cutout hole of the indoor unit with three 4 10 tapping
screws which should be prepared locally.
Installation of duct (should be prepared locally)
• Prepare a duct of which inner diameter fits into the outer diameter of the duct flange.
• In case that the environment above the ceiling is high temperature and high humid-
ity, wrap the duct in a heat insulate to avoid causing dew drop on the wall.
Duct flange recommended shape
(Thickness:0.8 or more)
3- 5 hole
Detail drawing of fresh air intake
Indoor unit
Ceiling surface
4.4. Suspension structure (Give site of suspension
strong structure) (Fig. 4-4)
• 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
• Use tie beams (single-story 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 10 (3/8"). (The bolts do not
come with the unit.)
Ferro concrete structure
Secure the suspension bolts using the method shown, or use steel or wooden hang-
ers, etc. to install the suspension bolts.
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 27-32 mm. Damage could result by
failing to adhere to this range.
4.6. Confirming the position of main unit and tighten-
ing 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 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, rfer to the intructions given on the Installation template.
S series
3- 2.8 Burring hole
73.4 cutout hole
Duct flange (Prepared locally)
4 10 Tapping screw (Prepared locally)
Duct