Installing The Indoor Unit - Mitsubishi Electric CITY MULTI PLFY-P20VBM-E Manuel D'installation

2. Installing the indoor unit

20-45
160
187.5
Fig. 2-2
90 100 100 90
350
Fig. 2-3
Ceiling
Rafter
Beam
Roof beam
Fig. 2-4
950
860-910 20-45
810
160
840
Min. 500
120°
Unit
Grille
Pillar
Use inserts rated at 100-150kg each
(procure locally)
Suspension bolts M10 (3/8")
(procure locally)
Steel reinforcing rod
2.2. Ceiling openings and suspension bolt installation
locations (Fig. 2-2)
Caution:
Install the indoor unit at least 2.5 m above floor or grade level.
• Using the installation template (top of the package) and the gauge (supplied as
an accessory with the grille), make an opening in the ceiling so that the main unit
can be installed as shown in the diagram. (The method for using the template
and the gauge is shown.)
* Before using, check the dimensions of template and gauge, because they
change due to fluctuations of temperature and humidity.
* The dimensions of ceiling opening can be regulated within the range shown
in Fig. 2-2; so center the main unit against the opening of ceiling, ensuring
that the respective opposite sides on all sides of the clearance between them
becomes identical.
• Use M10 (3/8") suspension bolts.
* Suspension bolts are to be procured at the field.
• Install securely, ensuring that there is no clearance between the ceiling panel &
grille, and between the main unit & grille.
Outer side of main unit
Bolt pitch
Ceiling opening
Outer side of Grille
* Note that the space between ceiling panel of the unit and ceiling slab and etc must be 10 to
15 mm.
* When the optional multi-functional casement is installed, add 135mm to the
dimensions marked on the figure.
Models C
20, 25, 32, 40, 50, 63, 80 241
100, 125 281
2.3. Branch duct hole and fresh air intake hole
(Fig. 2-3)
At the time of installation, use the duct holes (cut out) located at the positions
shown in Fig. 2-3, 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
dimensions marked on the figure.
• 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
that is pasted on the indoor unit.
Branch duct hole ø175 burring hole pitch
Indoor unit Fresh air intake hole diagram
Fresh air intake hole 3-ø2.8 burring hole
Drain pipe ø125 burring hole pitch
Refrigerant pipe ø100 cut out hole
Branch duct hole diagram Ceiling
(view from either side)
Detailed figure of removing the insulator
14-ø2.8 burring hole Insulator
ø150 cut out hole
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
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 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.)
Ferro-concrete structures
• Secure the suspension bolts using the method shown, or use steel or wooden
hangers, etc. to install the suspension bolts.
Grille
Ceiling
Multi function casement (option)
Entire periphery
(mm)
D
258
298
3