Mitsubishi Electric Air-Conditioners For Building Application Installation Manual page 4

2. Installing the indoor unit
F G
D
E
D Ceiling panel
H
E Rafter
F Beam
G Roof beam
H Use inserts rated at 250-350 lbs (100-150 kg) each (procure locally)
I Suspension bolts 3/8" (M10) (procure locally)
J Steel reinforcing rod
K C channel
L Channel suspension bracket
M M10 suspension bolt
Fig. 2-4
A
C
D
E
C
*1
B
Fig. 2-5
A
C
F
G
E
*
C
*
B
B
Fig. 2-6
B
A Suspension bolt (3/8" or M10)
B Clear plastic tubing
C Underside of bracket
D Secure front panel here
E Make these surfaces are flush with each other (0 - 1/8 in. (0 - 3 mm))
Fig. 2-7
4
K
in. (mm)
L
M
J
I
in. (mm)
A Suspension bolt
B Ceiling panel
C Nut
D Washer (with insulation) 2
E Washer (without insulation) 1
in. (mm)
D
A Suspension bolt (3/8" or M10)
B Ceiling surface
C Nut (3/8" or M10)
D Washer 2 (with insulation)
E Washer 1
F (Install with insulation facing down)
G Measurement to upper face of bracket
in. (mm)
A
C
D E
1 Wooden structures (Fig. 2-4)
• 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 2-3/8 in. (6 cm) long if the beams are separated by not more than
35-7/16 in. (90 cm) and their sides must be at least 3-9/16 in. (9 cm) long if the
beams are separated by as much as 70-7/8 in. (180 cm). The size of the suspen-
sion bolts should be 3/8" (ø10). (The bolts do not come with the unit.)
• Use channel, duct and other parts procured locally to suspend the indoor 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.
2.4. Unit suspension procedures (Fig. 2-5)
Procure 3/8" bolts or M10 bolts locally.
• Adjust the length of the bolt's protrusion from the ceiling surface beforehand.
*1. When using an extra upper nut in suspending the unit, in some cases you may
have to add it later.
Check the pitch of the suspension bolt. (13-1/2 in. × 32 in. (340 mm × 811 mm)) (Fig.
2-6)
1. Thread washers 1 2 (supplied) and their nuts (procured locally) onto the sus-
pension bolt in advance.
* Do this in the following order (from the top): nut, insulated washer 2, washer
without insulation 1, two nuts.
* Position insulated washer 2 with the insulated surface pointing down, as in the
figure.
2. Lift the unit into place, aligned properly with the suspension bolt. Pass the bracket
between washers 1 and 2, which are already in place, and secure it. Do the
same in all four places.
* Make sure the suspension bolt extends 3/4 in. (20 mm) or more from the surface
of the ceiling. Otherwise you will not be able to install the cover panel (sold sepa-
rately).
3. If the long opening in the bracket and opening in the ceiling do not align, adjust
them until they do.
4. Check that the four corners are all level, using a spirit level or clear plastic tubing
with water in it.
* Make sure that any slant in the unit after installation is less than 0.5 degrees
(approx. 1/4 in. (6 mm) on the long dimension of the unit).
5. Tighten all the nuts. (Fig. 2-7)