Outdoor Unit Installation; Flare Connection - Mitsubishi Electric MSZ-FE18NA Installation Manual

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 connector to conduit plate with lock nut then secure it against unit
with screws.
4) Connect ground wires of indoor/outdoor unit connecting wire (A) and power supply cord
(K) to the terminal block.
5) Loosen the terminal screw, and attach indoor/outdoor unit connecting wire (A) from the
indoor unit correctly on the terminal block. 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.
6) Firmly tighten the terminal screws. After tightening, verify that the wires are tightly fas-
tened.
7) Connect power supply cord (K).
8) Install the conduit cover.
9) Install the service panel securely.
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)
3) Remove flare nuts attached to indoor and outdoor units, then put them on pipe.
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
• Compare the flared work with Fig. 6.
• If flare is defective, cut off the section and repeat procedure.
Nut
Pipe diameter
Clutch
inch
inch (mm)
type tool
(mm)
for R410A
ø 1/4 (6.35) 1/4 (17)
ø 3/8 (9.52) 3/8 (22)
0 to 0.02
(0 to 0.5)
ø 1/2 (12.7) 1/2 (26)
ø 5/8 (15.88) 5/8 (29)
Lock nut
Conduit
plate
A inch (mm) Tightening torque
Clutch Wing nut
type tool type tool N•m
for R22 for R22
13.7 to
17.7
0.06 to
0.08
(1.5 to 2.0)
34.3 to
41.2
0.04 to
0.06
(1.0 to 1.5)
49.0 to
56.4
0.08 to
0.10
(2.0 to 2.5)
73.5 to
78.4
1-3/8 in.
(35 mm)
Lead
wire
Conduit pipe
TB support
lbf•ft
(kgf•cm)
10 to 13
(140 to
180)
Flaring tool
25 to 30
(350 to
420)
36 to 42
(500 to
Clutch type
575)
54 to 58
(750 to
Smooth all around
800)
Even length
all around
5/8 in.
(15 mm)
Power supply cord (K)
Terminal block
Grounding
terminal
Indoor/outdoor unit
connecting wire (A)
to conduit cover
Power supply cord (K)
• Make ground wire a little longer than oth-
ers. (More than 3-7/8 in. [100 mm])
• For future servicing, leave some slack in
the connecting wires.
Good
Copper
pipe
Fig. 1
Burr Copper pipe
Spare reamer
Pipe cutter
Die
Wing nut type
Flare nut
Fig. 4
Inside is shin-
ing without any
scratches.
Fig. 6
L1 L2
No good
Tilted Uneven Burred
Fig. 2
Fig. 3
Copper pipe
Fig. 5