Outdoor Unit Installation; Flare Connection - Mitsubishi Electric MSZ-GE24NA 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.
A inch (mm)
B
Pipe diameter
Clutch
inch
inch (mm)
type tool
(mm)
for R410A
21/32
ø 1/4 (6.35)
(17)
7/8
ø 3/8 (9.52)
(22)
0 to 0.02
(0 to 0.5)
1-1/32
ø 1/2 (12.7)
(26)
1-5/32
ø 5/8 (15.88)
(29)
Lock nut
Conduit
plate
Tightening torque
Clutch Wing nut
ft-lb
type tool type tool
(kgf•cm)
for R22 for R22
10 to 13
0.06 to
13.7 to 17.7
(140 to 180)
0.08
(1.5 to
25 to 30
0.04 to
34.3 to 41.2
2.0)
(350 to 420)
0.06
(1.0 to
36 to 42
0.08 to
49.0 to 56.4
1.5)
(500 to 575)
0.10
(2.0 to
54 to 58
73.5 to 78.4
2.5)
(750 to 800)
1-3/8 in.
(35 mm)
Lead
wire
Conduit pipe
TB support
Burr
N•m
Flaring tool
Clutch type
Smooth all around
Even length
all around
5/8 in.
(15 mm)
L1 L2
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.
No good
Good
Copper
pipe
Tilted Uneven Burred
Fig. 1
Copper pipe
Spare reamer
Pipe cutter
Copper pipe
Die
Flare nut
Wing nut type
Fig. 4
Inside is shin-
ing without any
scratches.
Fig. 6
Fig. 2
Fig. 3
Fig. 5