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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.
Service panel
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 diam-
B
Clutch
eter inch
inch
type tool
(mm)
(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)
3-3. PIPE CONNECTION
• Be sure to wrap insulation around the piping. Direct contact with the bare piping may result
in burns or frostbite.
Indoor unit connection
Connect both liquid and gas pipings to indoor unit.
frigeration oil on screw threads. Excessive tightening torque will result in damage on the
screw.
• 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.
When installing the unit, securely connect the refrigerant pipes before starting
the compressor.
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
Conduit plate
Lock nut
Conduit pipe
Conduit cover
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
(1.5 to
25 to 30
0.04 to
2.0)
(350 to 420)
0.06
(1.0 to
36 to 42
0.08 to
1.5)
(500 to 575)
0.10
(2.0 to
54 to 58
2.5)
(750 to 800)
WARNING
Lead wire
Terminal block
TB support
to conduit cover
N•m
Flaring tool
13.7 to 17.7
34.3 to 41.2
Clutch type
49.0 to 56.4
73.5 to 78.4
Even length all around
Indoor unit
connection
-
Outdoor unit
connection
19/32 in.
(15 mm)
Power supply cord (K)
• Make earth wire a little longer than others.
(More than 3-7/8 in. [100 mm])
• For future servicing, leave some slack in the
connecting wires.
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
Die
Flare nut
Wing nut type
Fig. 4
Smooth all around
Inside is shining without any scratches.
Flare nut
Union joint
Internal thread side
External thread side
Grip the nut on the
with a torque wrench.
union joint with a spanner.
L1 L2
No good
Tilted
Uneven Burred
Fig. 2
Fig. 3
Copper pipe
Fig. 5
Fig. 6
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