En-9
• When drain pump is used.
Do not cover the
panel window.
• When drain pump is not used. (Natural drainage)
Do not cover the
control box cover.
NOTES: Check for drainage
Pour about 1 liter of water from the position shown in the diagram or from the air
fl
ow
outlet to the dew tray. Check for any abnormalities such as strange noises and whether
the drain pump functions normally.
CAUTION
Make sure the drain water is properly drained.
3.5. Pipe installation
3.5.1. Pipe connection
CAUTION
Tighten the flare nuts with a torque wrench using the specified 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.
■
Flaring
Use special pipe cutter and
fl
are tool designed for R410A or R32 pipework.
(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 or R32
fl
are tool, or the conventional
fl
are tool. Leak-
age 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.
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 R32, 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 R32 pipes, the dimension A should be approx-
imately 0.5 mm more than indicated in the table (for
fl
aring with R32
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
NOTES:
The
fl
are nut speci
fi
cation is compliant with ISO14903.
■
Bending pipes
CAUTION
• To prevent breaking of the pipe, avoid sharp bends.
• If the pipe is bent repeatedly at the same place, it will break.
• The pipes are shaped by your hands. Be careful not to collapse them.
• Bend R70 mm or more with a pipe bender.
• 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 anymore.
• Do not bend or stretch the pipes more than 3 times.
• When bending the pipe, do not bend it as
is. The pipe will be collapsed. In this case,
cut the insulating pipe with a sharp cutter
as shown on the right, and bend it after
exposing the pipe. After bending the pipe
as you want, be sure to put the heat insu-
lating pipe back on the pipe, and secure it
with tape.
Pipe
Insulating
pipe
Cutter
Cut line
■
Flare 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 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 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 servic-
ing when necessary.
• In order to prevent water from leaking into the control box, make sure that the pip-
ing 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. (Refer to the following table 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)
Do not remove the cap from the connection pipe before connecting the pipe.
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