En-5
CAUTION
Be sure to install the pipe against the port on the indoor unit and the outdoor unit
correctly. If the centering is improper, the
fl
are nut cannot tightened smoothly. If the
fl
are nut is forced to turn, the threads will be damaged.
Do not remove the flare nut from the indoor unit pipe until immediately before
connecting the connection pipe.
Do not use mineral oil on
fl
ared part. Prevent mineral oil from getting into the system
as this would reduce the lifetime of the units.
Flare nut [mm (in)]
Tightening torque [N·m (kgf·cm)]
6.35 (1/4) dia.
16 to 18 (160 to 180)
9.52 (3/8) dia.
32 to 42 (320 to 420)
12.70 (1/2) dia.
49 to 61 (490 to 610)
15.88 (5/8) dia.
63 to 75 (630 to 750)
19.05 (3/4) dia.
90 to 110 (900 to 1,100)
4.4. Brazing connection (pipe connection) (ARXC096)
4.4.1. Bending pipes
• The pipes are shaped by your hands or pipe bender. Be careful not to collapse them.
• Do not bend the pipes in an angle more than 90°.
• When pipes are repeatedly bend or stretched, the material will harden, making it dif
fi
cult
to bend or stretch them any more. Do not bend or stretch the pipes more than 3 times.
CAUTION
To prevent breaking of the pipe, avoid sharp bends.
If the pipe is bent repeatedly at the same place, it will break.
4.4.2. Pipe connection
• The gas and liquid pipes connections must be brazed.
• Be sure to braze them before performing any wiring work or installing the drain pipe.
Outer diameter of pipe
Connection Pipe (Liquid)
9.52 mm
Connection Pipe (Gas)
22.22 mm
Control box
Rear panel
Thermistor
Maintenance panel
Connection Pipe (Liquid)
Safety drain pan
Pipe heat insulation
& Pipe rubber
Connection Pipe (Gas)
WARNING
Be sure to use wet cloth, etc., to protect the pipe rubber, pipe heat insulation, and
the heat insulation of the safety drain pan as shown below. Because these parts are
extremely
fl
ammable, they can cause a
fi
re if they are not properly protected.
The heat exchanger contains a thermistor.
Completely cover the pipe
rubber and pipe heat insulation
with wet cloth, etc., to prevent
them from burning.
Pipe heat insulation
Pipe rubber
Pipe rubber
Pipe heat insulation
Brazing
Do not expose the
thermistor to the
fl
ame.
Protect these areas with wet cloth, etc.
4.3. Flare connection (pipe connection) (ARXC072/090)
WARNING
Tighten the
fl
are nuts with a torque wrench using the speci
fi
ed tightening method.
Otherwise, the
fl
are nuts could break after a prolonged period, causing refrigerant to
leak and generate a hazardous gas if the refrigerant comes into contact with a
fl
ame.
4.3.1. Flaring
Use special
fl
are tool exclusive for R410A.
(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 any burrs.
(3) Insert
the
fl
are nut (always use the
fl
are nut attached to the indoor and respectively)
onto the pipe and perform the
fl
are processing with a
fl
are tool. Use the outdoor units
(or RB unit) special R410A
fl
are tool, Leakage of refrigerant may result if other
fl
are
nuts are used.
(4) Protect the pipes by pinching them or with tape to prevent dust, dirt, or water from
entering the pipes.
Check if [L] is
fl
ared uniformly and
is not cracked or scratched.
Die
Pipe
A
B
Pipe outside diameter
[mm (in)]
Dimension A [mm]
Dimension B
-
0
0.4
[mm]
Flare tool for R410A,
clutch type
6.35 (1/4)
0 to 0.5
9.1
9.52 (3/8)
13.2
12.70 (1/2)
16.6
15.88 (5/8)
19.7
19.05 (3/4)
24.0
When using conventional (R22)
fl
are tools to
fl
are R410A pipes, the dimension A should
be approximately 0.5 mm more than indicated in the table (for
fl
aring with R410A
fl
are
tools) to achieve the speci
fi
ed
fl
aring. Use a thickness gauge to measure the dimension A.
It is recommended that a R410A
fl
aring tool is used.
Width across
fl
ats
Pipe outside
diameter [mm (in)]
Width across
fl
ats
of Flare nut [mm]
6.35 (1/4)
17
9.52 (3/8)
22
12.70 (1/2)
26
15.88 (5/8)
29
19.05 (3/4)
36
4.3.2. Bending pipes
• The pipes are shaped by your hands or pipe bender. Be careful not to collapse them.
• Do not bend the pipes in an angle more than 90°.
• When pipes are repeatedly bend or stretched, the material will harden, making it dif
fi
cult
to bend or stretch them any more. Do not bend or stretch the pipes more than 3 times.
CAUTION
To prevent breaking of the pipe, avoid sharp bends.
If the pipe is bent repeatedly at the same place, it will break.
4.3.3. Pipe connection
When the
fl
are nut is tightened properly by your hand, hold the body side coupling with a
separate spanner, then tighten with a torque wrench.
CAUTION
Hold the torque wrench at its grip, keeping it at a right angle with the pipe, in order to
tighten the
fl
are nut correctly.
Connection pipe
Torque wrench
Indoor unit pipe
(Body side)
Tighten with 2 wrenches.
Holding wrench
Flare nut
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2/21/2019 1:51:40 PM
