En-5
[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)
Connection pipe (6.35 mm dia.)
Align the marks
Indoor unit
Connection pipe (9.52 or 12.7 mm dia.)
Top hooks
Bottom hooks
Wall hook bracket
Bend R70 mm with
a pipe bender
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.
6.9. Flare connection (Pipe connection)
CAUTION
Tighten the
fl
are nuts with a torque wrench using the speci
fi
ed tightening method. Oth-
erwise, 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.
6.9.1. 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
fl
are tool. Leakage of refriger-
ant 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.
Die
A
Pipe
B
L
Check if [L] is flared uniformly
and is not cracked or scratched.
Pipe outside diameter
[mm (in.)]
Dimension A [mm]
Dimension B [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 ap-
proximately 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.
Width across
flats
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
6.9.2. 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.
6.9.3. Pipe connection
CAUTION
Be sure to Install the pipe against the port on the indoor unit correctly. If the center-
ing is improper, the
fl
are 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 con-
necting 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
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 hazardous gas if the refrigerant comes into contact with a
fl
ame.
Connect the piping so that the control box cover can easily be removed for servicing
when necessary.
In order to prevent water from leaking into the control box, make sure that the piping
is well insulated.
When the flare nut is tightened properly by your hand, hold the body side coupling with a
wrench, then tighten with a torque wrench. (See the table below for the flare nut tightening
torques.)
Tighten with 2 wrenches.
Holding wrench
Flare nut
Connection pipe
Torque wrench
Indoor unit pipe
(Body side)
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)
9319357003-02_IM_EN.indd 5
9319357003-02_IM_EN.indd 5
7/27/2011 3:42:20 PM
7/27/2011 3:42:20 PM
