Indoor Unit Installation - Mitsubishi Electric MSZA09NA Installation Manual

2. INDOOR UNIT INSTALLATION

2-1. FIXING OF INSTALLATION PLATE
• Find a structural material (such as a stud) in the wall and fix installation plate (1) horizon-
tally with fixing screws (2).
• To prevent installation plate (1) from vibrating, be sure to install the fixing screws in the
holes indicated in the illustration. For added support, fixing screws may also be installed
in other holes.
• When bolts recessed in the concrete wall are to be utilized, secure installation plate (1)
using 7/16 in. x 13/16 in · 7/16 in. x 1 in. (11 mm × 20 mm · 11 mm × 26 mm) oval hole
(17-3/4 in. [450 mm] pitch).
• If the recessed bolt is too long, change it for a shorter one available in the market.
2-2. WALL HOLE DRILLING
1) Determine the wall hole position.
2) Drill a dia. 2-9/16 in. (65 mm) hole. The outdoor side should be 6/32 to 9/32 in. (5 to 7
mm) lower than the indoor side.
3) Insert wall hole sleeve (C).
2-3. CONNECTING WIRES FOR INDOOR UNIT
Note:
When the indoor unit is powered from the outdoor unit, a disconnect switch may need to
be installed to power supply circuit (between indoor and outdoor unit) depending on local
code.
1) Remove the front panel. (Refer to 5-1.)
2) Hook the upper part of the indoor unit on the installation plate.
3) Remove corner box and conduit cover.
4) Fix conduit pipe (for rear piping) / elbow joint (for right, left, or downward piping) to con-
duit cover with lock nut. The thread part of installed conduit pipe / elbow joint appearing
inside should be less than 3/8 in. (10 mm). (Fig. 1) Elbow joint should appear less than
1-3/16 in. (30 mm) outside. (Fig. 2)
5) Process the end of ground wire (Fig. 3). Connect it to the ground terminal of electrical
parts box.
6) Process the end of indoor/outdoor unit connecting wire (A) (Fig. 3). Fix it to terminal
block. Be careful not to make mis-wiring. Fix the wire to the terminal block securely so
that no part of its core is appeared, and no external force is conveyed to the connecting
section of the terminal block.
7) Firmly tighten the terminal screws to prevent them from loosening. After tightening, pull
the wires lightly to confirm that they do not move.
8) Secure indoor/outdoor unit connecting wire (A) and the ground wire with conduit cover.
Never fail to hook the claw of the conduit cover to the electrical box. Attach the conduit
cover securely. (Fig. 4)
9) According to the piping direction, cut off the shaded part of the left side of box (Fig. 5) or
corner box (Fig.6). Reinstall corner box and front panel.
Bind the line to the center hole.
Installation plate (1)
Level
3 in.
(75 mm)
or more
Wall
Align the plumb
Fixing screw (2)
line with the mark
.
Ø 2-9/16 in.
(65 mm)
Fixing
screw
Conduit pipe
or
(for rear piping)
• Connect wires to the matching numbers of terminals
• For future servicing, give extra length to the connecting wires.
Conduit cover
Less than 3/8 in.
(10 mm)
Lock nut
Conduit pipe or
elbow joint
19/32 in.
1 in. (15 mm)
(25 mm)
Lead
wire
• Make ground wire a little longer than
others. (More than 1-9/16 in. [40 mm])
Cut off in case of
Cut off in case
left piping
of left-downward
piping
2-19/32 in. (66 mm) or more
4-17/32 in. (115 mm) or more for left
Ceiling
and left back piping (using spacer)
3 in.
(75 mm)
or more
4 in.
(100 mm)
Align the
Insert
scale with
Center of dia.
the
the line. *
2-9/16 in.
scale. *
(65 mm) hole
Plumb
* Same for left hole.
Wall
6/32-9/32 in.
(5-7 mm)
Outdoor side
Lock nut
Conduit
Indoor terminal
cover
block
Elbow joint
(for right, left, or downward piping)
Less than 1-3/16 in.
(30 mm)
Elbow joint
(for right, left, or downward piping)
Fig. 1
Hook
Conduit cover
Fig. 3
Box
Cut off in case of
Cut off in case of right piping
downward piping
Fig. 5
Wall
Fig. 2
Fig. 4
Corner box
1 in.
(25 mm)
Fig. 6