Indoor Unit Installation - Mitsubishi Electric MSZ-FE18NA Manuel D'installation

2. INDOOR UNIT INSTALLATION

2-1. ATTACHING THE INSTALLATION PLATE
• Find a stud in the wall to attach installation plate (1) horizontally by tightening the fixing
screws (2) firmly.
• 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 knockout is removed, apply vinyl tape to the knockout edges to prevent dam-
aging the wires.
• 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).
• If the recessed bolt is too long, change it for a shorter one (field-supplied).
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, depending on local code, a discon-
nect switch needs to be installed to a power supply circuit.
1) Remove the panel assembly. (Refer to 5-1.)
2) Place the upper part of the indoor unit on the installation plate.
3) Remove corner box and electrical cover.
4) Remove display panel, conduit cover and conduit plate.
5) Attach conduit pipe (for rear piping) / elbow joint (for right, left, or downward piping) to
conduit plate with lock nut. The thread of the installed conduit pipe / elbow joint appear-
ing 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)
6) Process the end of ground wire (Fig. 3). Connect it to the ground terminal of electrical
parts box.
7) Process the end of indoor/outdoor unit connecting wire (A) (Fig. 3). Attach it to the
terminal block. Be careful not to make mis-wiring. Attach the wire to the terminal block
securely so that its core cannot be seen, and no external force affects the connecting
section of the terminal block.
8) Firmly tighten the terminal screws. After tightening, verify that the wires are tightly fas-
tened.
9) Reinstall conduit plate, conduit cover and display panel.
10) According to the piping direction, remove the shaded part of the left side of box (Fig. 4)
or corner box (Fig. 5). Reinstall electrical cover, corner box and panel assembly.
Remark:
* A disconnect switch should be
required.
Check the local code.
** Use a ring tongue terminal in
order to connect a ground wire
to terminal.
Grounding terminal**
Ground
Power supply
208/230 V AC,
1 phase 2 wires,
60 Hz
INDOOR UNIT
Grounding
Terminal block
terminal**
Disconnect
switch*
208/230 V AC,
1 phase, 60 Hz
OUTDOOR
UNIT
Grounding terminal**
Installation plate (1)
Level
5-7/8 in.
(149 mm)
or more
Wall
Fixing screw (2)
ø 3 in.
(75 mm)
Electrical cover
Electrical box
Fixing screw
Conduit cover
Display panel
Lock nut
Conduit plate
Elbow joint
(for right, left, or downward piping)
• Connect wires to the appropriate terminals
• For future servicing, leave some slack in the connecting wires.
Conduit plate
Less than 3/8 in.
(10 mm)
Lock nut
Conduit pipe or
elbow joint
19/32 in.
(15 mm)
1-3/8 in.
(35 mm)
Lead
wire
• Make ground wire a little longer than
others. (More than 2-3/8 in. [60 mm])
Corner box
Remove
panel for pip-
ing on bottom
Remove panel
side of unit.
for piping on
Remove panel
right side of unit.
for conduit
pipe on bottom
side of unit.
Ceiling
2 1/8 in. (55 mm) or more
4 5/8 in. (118 mm) or more for left
and left back piping (using spacer)
5 1/2 in.
(140
or more
4 in.
(100 mm)
Insert
Align the
Center of
the
scale with
ø 3 in. (75 mm)
scale. *
the line. *
hole
* Same for left hole.
Wall
6/32-9/32 in.
(5-7 mm)
Outdoor side
Grounding
terminal
Indoor terminal
block
Conduit pipe
(for rear piping)
or
Less than 1-3/16 in.
Conduit plate
(30 mm)
Elbow joint
(for right, left, or downward piping)
Fig. 1
Remove panel
for piping on
Remove panel for
left side of unit.
piping on bottom
Fig. 3 left side of unit.
Fig. 5
mm)
Wall
Fig. 2
Box
Fig. 4