En-7
• For left piping and left rear piping, align the marks on the
wall hook bracket and shape the connection pipe.
• Bend the connection piping at the bend radius of
100 mm (3-30/32 in.) or more and install no more than
35 mm (1-3/8 in.) from the wall.
• After passing the indoor piping and drain hose through the
wall hole, hang the indoor unit on the hooks at the top and
bottom of the wall hook bracket.
[Installing the indoor unit]
• Hang the indoor unit from the hooks at the top of the wall
hook bracket.
• Insert the spacer, etc. between the indoor unit and the wall
hook bracket and separate the bottom of the indoor unit from
the wall.
Indoor unit
Wall hook bracket
(Spacer)
Wall hook
bracket
Alignment marks
Connection piping
Large piping
Top hooks
Indoor
unit
(Fitting)
Bottom hooks
Wall hook
bracket
Small piping
After hooking the indoor unit to the top hook, hook the
fi
ttings
of the indoor unit to the 2 bottom hooks while lowering the unit
and pushing it against the wall.
6.6. Flare connection (Pipe connection)
WARNING
• 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 hazardous gas if the refrigerant comes into
contact with a
fl
ame.
6.6.1. Flaring
• Use special pipe cutter and
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 unit(s) and outdoor unit or branch box respectively)
onto the pipe and perform the
fl
are processing with a
fl
are
tool. Use the special R410A
fl
are tool, or the conventional
flare tool. Leakage of refrigerant may result if other flare
nuts are used.
(4)
Protect the pipes by pinching them or with tape to prevent
dust, dirt, or water from entering the pipes.
Pipe
Check if [L] is flared uniformly
and is not cracked or scratched.
Die
L
Pipe outside
diameter
[mm (in.)]
Dimension A
[mm (in.)]
Dimension B
-
0
0.4
[mm (in.)]
Flare tool for R410A,
clutch type
6.35 (1/4)
0 to 0.5
(0 to 0.020)
9.1 (11/32)
9.52 (3/8)
13.2 (17/32)
12.70 (1/2)
16.6 (21/32)
15.88 (5/8)
19.7 (25/32)
19.05 (3/4)
24.0 (15/16)
When using conventional
fl
are tools to
fl
are R410A pipes, the
dimension A should be approximately 0.5mm (0.020 in.) 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.
Width across
flats
flats
Pipe outside
diameter [mm (in.)]
Width across flats
of Flare nut [mm (in.)]
6.35 (1/4)
17 (21/32)
9.52 (3/8)
22 (7/8)
12.70 (1/2)
26 (1-1/32)
15.88 (5/8)
29 (1-5/32)
19.05 (3/4)
36 (1-13/32)
6.6.2. 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 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.
6.6.3. Pipe connection
CAUTION
• Be sure to Install the pipe against the port on the indoor unit
correctly. If the centering is improper, the flare nut cannot
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 at a 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 hazardous gas if the refrigerant comes into
contact with a
fl
ame.
9318739022_IM.indb Sec1:7
9318739022_IM.indb Sec1:7
2010-11-2 15:25:14
2010-11-2 15:25:14
