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5.4. Flare connection (pipe connection)
CAUTION
Do not use mineral oil on a
fl
ared part. Prevent mineral oil from getting into the system
as this would reduce the lifetime of the units.
While welding the pipes, be sure to blow dry nitrogen gas through them.
Flaring
(1) Cut the connection pipe to the necessary length with a pipe cutter.
(2) Hold the pipe downward so that cuttings will not enter the pipe and remove the
burrs.
(3) Insert the
fl
are nut onto the pipe and
fl
are the pipe with a
fl
aring tool.
Insert the
fl
are nut (always use the
fl
are nut attached to the indoor and outdoor
units respectively) onto the pipe and perform the
fl
are processing with a
fl
are tool.
Use the special R32(R410A)
fl
are tool, or the conventional (for R22)
fl
are tool.
When using the conventional
fl
are tool, always use an allowance adjustment gauge and
secure the A dimension shown in table 2.
Check if [L] is
fl
ared uniformly and
is not cracked or scratched.
Die
A
Pipe
Pipe outside
diameter
A (mm)
Flaring tool for
R32 or R410A, clutch type
Conventional (R22) Flaring tool
Clutch type
Wing nut type
ø 6.35 mm (1/4")
0 to 0.5
1.0 to 1.5
1.5 to 2.0
ø 9.52 mm (3/8")
ø 12.70 mm (1/2”)
ø 15.88 mm (5/8")
ø 19.05 mm (3/4”)
Bending pipes
(1) When bending the pipe, be careful not to crush it.
(2) To prevent breaking of the pipe, avoid sharp bends.
Bend the pipe with a radius of curvature of 70 mm or over.
(3) If the copper pipe is bend the pipe or pulled to often, it will become stiff. Do not
bend the pipes more than three times at one place.
Pipe connection
(1) Detach the caps and plugs from the pipes.
CAUTION
Be sure to apply the pipe against the port on the indoor unit and the outdoor unit
correctly. If the centering is improper, the
fl
are nut cannot be tightened smoothly. If the
fl
are nut is forced to turn, the threads will be damaged.
Do not remove the
fl
are nut from the indoor unit pipe until immediately before
connecting the connection pipe.
(2) Centering the pipe against port on the outdoor unit, turn the
fl
are nut with your
hand.
To prevent gas leakage,
coat the
fl
are surface with
alkylbenzene oil (HAB).
Do not use mineral oil.
(3) Tighten
the
fl
are nut of the connection pipe at the outdoor unit valve connector.
Flare nut
Connection pipe
(liquid)
Connection pipe
(gas)
Flare nut
3-way valve
(liquid)
3-way valve
(gas)
(5) Do not tighten the terminal screws too much, otherwise, the screws may break.
Wire
Screw with special washer
Ring terminal
Terminal blocks
Screw with
special washer
Wire
Ring terminal
(6) See the table below for the terminal screw tightening torques.
Tightening torque [N·m (kgf·cm)]
M4 screw
1.2 to 1.8 (12 to 18)
M5 screw
2.0 to 3.0 (20 to 30)
5.3. Wiring method
CAUTION
When connecting the power supply cable, make sure that the phase of the power
supply matches with the phase of the terminal board. If the phases do not match, the
compressor will rotate in reverse and will not be able to compress.
(1)
Remove the outdoor unit Switch cover A, B.(See “5.1. Switch cover remove”.)
(2)
Remove the outdoor unit cable clamp.
(3)
Connect the power supply cable and the connection cable to terminal.
(4)
Fasten the power supply cable and connection cable with cable clamp.
(5)
Install the Switch cover A, B.(See “5.1. Switch cover remove”.)
N
L
3
2
1
Screw
Cable clamp
5.3.1. Connection diagrams
3
1 2
N
L
3
1 2
Power supply
Power line
Earth(Ground) line
Outdoor unit side terminal
Indoor unit side terminal
Earth
(Ground) line
EARTH
(GROUND)
EARTH
(GROUND)
5.3.2. Connection cable preparation
• Keep the earth wire longer than the other wires.
Earth wire
30 mm
Power supply cable or
Connection cable
35 mm
5.3.3. Connection cable wiring
10 mm
Connection and Power
supply cable
Run the connection cable to the rear of
the outdoor unit within the range of the
arrows shown in the
fi
gure.
(The switch cover becomes dif
fi
cult to
install.)
Cutout
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1/12/2017 11:49:08 AM
