Mitsubishi Electric MSZ-FS18NA Manuel D'installation page 6

3. OUTDOOR UNIT INSTALLATION
3-1. CONNECTING WIRES FOR OUTDOOR UNIT
1) Remove the service panel.
2) Remove the conduit cover.
3) Attach the conduit connectors to the conduit plate with lock nuts then secure it against unit with
screws.
4) Connect the ground wires of indoor/outdoor unit connecting wire (A) and power supply cord (K)
to the TB support.
5) Loosen the terminal screws, then attach indoor/outdoor unit connecting wire (A) and power sup-
ply cord (K) from the indoor unit correctly to the terminal block. Attach the wires to the terminal
block securely so that the cores cannot be seen, and no external force affects the connecting
section of the terminal block.
6) Firmly tighten the terminal screws. After tightening, verify that the wires are tightly fastened.
7) Install the conduit cover.
8) Install the service panel securely.
<FS06/09/12>
Service panel
<FS15/18>
Service panel
Conduit cover
3-2. FLARE CONNECTION
1) Cut the copper pipe as straight as possible with a pipe cutter. (Fig. 1, 2)
2) Remove all burrs from the cut section of the pipe, ensuring that precautions are taken to avoid
getting metal shavings into the piping. (Fig. 3)
4) Flaring work (Fig. 4, 5). Firmly hold copper pipe in the dimension shown in the table. Select A
inch (mm) from the table according to the tool you use.
5) Check
Pipe diameter B inch
Clutch
inch (mm) (mm)
type tool
for R410A
21/32
ø1/4 (6.35)
(17)
7/8
ø3/8 (9.52)
(22)
0 to 0.02
(0 to 0.5)
1-1/32
ø1/2 (12.7)
(26)
1-5/32
ø5/8 (15.88)
(29)
Lock nut
Conduit cover
Lock nut
Conduit pipe
Conduit
plate
A inch (mm) Tightening torque
Clutch Wing nut
ft-lb
type tool type tool
(kgf•cm)
for R22 for R22
10 to 13
0.06 to
(140 to 180)
0.08
25 to 30
(1.5 to 2.0)
0.04 to
(350 to 420)
0.06
36 to 42
(1.0 to 1.5)
0.08 to
(500 to 575)
0.10
54 to 58
(2.0 to 2.5)
(750 to 800)
Lead
wire
Terminal block
Conduit plate
Conduit pipe
TB support
to conduit cover
Terminal block
TB support
to conduit cover
N•m
13.7 to 17.7
34.3 to 41.2
49.0 to 56.4
73.5 to 78.4
Smooth all around
Even length
all around
19/32 in.
(15 mm)
• Make ground wire a little longer than others.
(More than 4 in. [100 mm])
• For future servicing, leave some slack in the
connecting wires.
• Be sure to attach each screw to its corre-
spondent terminal when securing the cord
and/or the wire to the terminal block.
Grounding
terminal
Indoor/outdoor unit
connecting wire (A)
Power supply cord (K)
Grounding
terminal
Indoor/outdoor unit
connecting wire (A)
Power supply cord (K)
Good
90°
Copper
pipe
Fig. 1
Copper pipe
Burr
Spare reamer
Pipe cutter
Flaring tool
Die
Flare nut
Clutch type Wing nut type
Fig. 4
Inside is shin-
ing without any
scratches.
Fig. 6
L1 L2
Power supply cord (K)
No good
Tilted Uneven Burred
Fig. 2
Fig. 3
Copper pipe
B
Fig. 5