Indoor Unit Installation - Mitsubishi Electric MSZ-GA24NA Installation Manual

2. INDOOR UNIT INSTALLATION

2-1. ATTACHING THE INSTALLATION PLATE
• Find a stud in the wall to attach installation plate (1) horizontally on the wall with screws (2).
• To prevent installation plate (1) from vibrating, be sure to install the attachment screws
in the holes indicated in the illustration. For added support, additional screws may also
be installed in other holes.
• When the indoor unit is to be attached to a concrete wall using recessed bolts, 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).
2-2. DRILLING
1) Determine where the holes will be located on the wall.
2) Drill a ø 3 in. (75 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 electrical cover.
4) Remove SW TB cover.
5) Remove corner box.
6) Remove display panel and conduit cover.
7) Fix conduit pipe (for rear piping) / elbow joint (for right, left, or downward piping) to con-
duit plate 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)
8) Process the end of ground wire (Fig. 3). Connect it to the ground terminal of electrical
parts box.
9) 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.
10) Firmly tighten the terminal screws to prevent them from loosening. After tightening, pull
11) Reinstall display panel and conduit cover.
12) According to the piping direction, cut off the shaded part of the left side of box (Fig. 4)
or corner box (Fig. 5).
13) Reinstall SW TB cover.
14) Reinstall electrical cover.
15) Reinstall front panel.
Remark:
* A disconnect switch is required.
Check the local code.
** Use a ring tongue terminal in
order to connect a ground wire
to terminal.
208/230 V AC
1phase, 60 Hz
OUTDOOR UNIT
Power supply
208/230 V AC,
1phase 2 wires,
60 Hz
Ground
INDOOR UNIT
Grounding
terminal**
Terminal block
Disconnect
switch*
Grounding terminal**
Bind the line to the center hole.
Installation plate (1)
Level
4-3/4 in.
(120 mm)
or more
Wall
Align the plumb
Attachment
line with the
screw (2)
mark .
ø 3 in.
(75 mm)
Electrical cover
Fixing
screw
SW TB cover
Indoor terminal
block
• Connect wires to the matching
numbers of terminals.
• For future servicing, give extra
length to the connecting wires.
Conduit plate
Less than 3/8 in.
(10 mm)
Lock nut
Conduit pipe or
elbow joint
5/8 in.
(15 mm)
2-3/16 in.
(55 mm)
Lead
wire
• Make ground wire a little longer than
others. (More than 1-9/16 in. [40 mm])
Corner box
Cut off in case of
Cut off in case of
downward piping
right piping
2-7/8 in. (72 mm) or more
Ceiling
4 in. (100 mm) or more for left and
left back piping (using spacer)
7-7/8 in.
(200 mm)
or more
4 in.
(100 mm)
Insert
Align the
the
Center of
scale with
scale. *
ø 3 in. (75 mm)
the line. *
hole
Plumb
* Same for left hole.
Wall
6/32-9/32 in.
(5-7 mm)
Outdoor side
or
Lock nut
Elbow joint
(for right, left, or downward piping)
Grounding
terminal
Display panel
Conduit cover
Conduit plate
Less than 1-3/16 in.
(30 mm)
Elbow joint
(for right, left, or downward piping)
Fig. 1
Cut off in
case of left
Cut off in case of
piping
left-downward piping
Fig. 3
Fig. 5
Wall
Electrical
box
Conduit
plate
Conduit
pipe
(for rear
piping)
Fig. 2
Box
Fig. 4