Mitsubishi Electric MSZ-FS18NA Manuel D'installation page 4

2. INDOOR UNIT INSTALLATION
2-1. ATTACHING THE INSTALLATION PLATE
• 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 ø3 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:
The unit should be installed by a licensed contractor/electrician. If required by applicable
national, state and local codes; a disconnect switch will need to be installed when the
indoor unit is powered from the outdoor unit.
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 and i-see sensor assembly, conduit cover and conduit plate.
5) Attach straight joint (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 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)
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 fastened.
9) Reinstall conduit plate, conduit cover and display panel.
10) According to the piping direction, remove the shaded part of the corner box L (Fig. 4) or
corner box R (Fig. 5). Reinstall electrical cover, corner box R and front panel.
Remark:
* A disconnect switch
should be required.
Check the local code.
** Use a ring tongue termi-
nal in order to connect a
ground wire to terminal.
Power supply 208/230 V AC,
1phase 2wires.
60 Hz
Ground
INDOOR UNIT
Grounding
Terminal block
terminal**
Disconnect
switch*
208/230 V AC
1phase, 60 Hz
OUTDOOR UNIT
Grounding terminal**
Lead
wire
• Make ground wire a little longer than oth-
ers. (More than 1-9/16 in. [40 mm])
Installation plate (1)
4-7/8 in.
(122.5 mm)
or more
Wall
Attachment
screw (2)
Display and i-see
sensor assembly
Conduit cover
• Connect wires to the appropriate terminals
• For future servicing, leave some slack in the connecting wires.
Conduit plate
19/32 in.
(15 mm)
Remove coner Remove coner box L
box L for piping for piping on bottom
on left side of unit left side of unit
Fig. 3
Ceiling 3-3/8 in. (85 mm) or more
5-11/16 in. (143 mm) or more for left/
left rear piping (using spacer)
Level
Insert
the
scale. *
Wall
ø3 in.
6/32-9/32 in.
(75 mm)
(5-7 mm)
Outdoor side
Electrical box
Electrical cover
Fixing
screw
Lock nut
Conduit plate
Elbow joint
(for right, left, or downward piping)
Less than 3/8 in.
(10 mm)
Conduit plate
Lock nut
Conduit pipe or
elbow joint
(for right, left, or downward piping)
Fig. 1
Remove corner box R
for piping on bottom
side of unit
Coner
box L
Fig. 4
5-1/4 in.
(132.5 mm)
or more
4-3/4 in. (120 mm)
Wall
Align the Center of ø3 in.
scale with (75 mm) hole
the line. *
* Same for left hole.
Indoor terminal
block
Straight joint
(for rear piping)
or
Less than 1-3/16 in.
(30 mm)
Elbow joint
Fig. 2
Remove corner box
R for piping on right
side of unit
Corner
box R
Fig. 5