Outdoor Unit Installation; Flare Connection; Pipe Connection - Mitsubishi Electric MSZ-GA24NA 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 cover 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 TB support.
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
Nut
Pipe diameter
Clutch
inch
inch (mm)
type tool
(mm)
for R410A
1/4
ø 1/4 (6.35)
(17)
3/8
ø 3/8 (9.52)
(22)
0 to 0.02
(0 to 0.5)
1/2
ø 1/2 (12.7)
(26)
5/8
ø 5/8 (15.88)
(29)

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 mm from the table according to the tool you use.
5) Check

3-3. PIPE CONNECTION

Indoor unit connection
Connect both liquid and gas piping to indoor unit.
• Apply a thin coat of refrigerant oil (J) on the seat surface of pipe.
• Use tightening torque table above as a guideline for indoor unit side joints, and tighten
Outdoor unit connection
Connect pipes to stop valve pipe joint of the outdoor unit following the same procedure
detailed in Indoor unit connection.
• For tightening, use a torque wrench or spanner.
3-4. INSULATION AND TAPING
1) Cover piping joints with pipe cover.
2) For outdoor unit side, insulate the piping, including valves.
3) Apply piping tape (G) starting from the connection on the outdoor unit.
• When piping has to be installed through a ceiling, closet or where the temperature and
Lock nut
Conduit cover
A inch (mm) Tightening torque
Clutch Wing nut
type tool type tool N•m
for R22 for R22
13.7 to
0.06 to
17.7
0.08
(1.5 to
34.3 to
2.0)
0.04 to
41.2
0.06
(1.0 to
49.0 to
1.5)
0.08 to
56.4
0.10
(2.0 to
73.5 to
2.5)
78.4
1-3/8 in.
(35 mm)
Lead
wire
Connector
Terminal block
Grounding
TB support
terminal
ft•lb
(kgf•cm)
10 to 13
(140 to
180)
25 to 30
(350 to
420)
36 to 42
(500 to
575)
54 to 58
(750 to
800)
Flaring tool
Clutch type
Smooth all around
Even length
all around
5/8 in.
(15 mm)
Power supply cord (K)
Indoor/outdoor unit
connecting wire (A)
to conduit cover
• Make ground wire a little longer than oth-
ers. (More than 1-3/8 in. [35 mm])
• For future servicing, leave some slack in
the connecting wires.
Good
Copper
pipe
Fig. 1
Copper pipe
Burr
Spare reamer
Pipe cutter
Die
Wing nut type
Flare nut
Fig. 4
Inside is shin-
ing without any
scratches.
Fig. 6
Power supply cord (K)
No good
Tilted Uneven Burred
Fig. 2
Fig. 3
Copper pipe
Fig. 5