En-8
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
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.
Pipe outside
diameter [mm (in.)]
Width across flats
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
•
If pipes are shaped by hand, 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 three 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
CAUTION
• Be sure to connect the EV kit (optional) that is suitable to the
indoor unit.
For installation instructions, refer to the installation Manual of
the EV kit.
• Be sure to apply the pipe against the port on the indoor unit
correctly. If the centering is improper, the
fl
are nut cannot be
tighten 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.
• Hold the torque wrench at its grip, keeping it in the right
angle with the pipe, in order to tighten the
fl
are nut correctly.
• Tighten the flare 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.
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.
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)
Selecting the EV kit
MODEL
APPLICABLE EV kit
AS E07/09L
UTR-EV09XB
AS E12/14L
UTR-EV14XB
CAUTION
• After checking for gas leaks (refer to the Installation Manual
of the outdoor unit), perform this section.
• Install heat insulation around both the large (gas) and small
(liquid) pipes. Failure to do so may cause water leaks.
After checking for gas leaks, insulate by wrapping insulation
around the two parts (gas and liquid) of the indoor unit coupling,
using the Coupler heat insulation.
After installing the Coupler heat insulation, wrap both ends with
vinyl tape so that there is no gap.
CAUTION
• Must
fi
t tightly against body without any gap.
Width across
4.4. Installing heat insulation
