[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.
Wall hook bracket
Connection pipe [6.35-mm (1/4-in.) dia.]
Bend R70 mm
Connection pipe [9.52- or 12.7-mm (3/8- or 1/2-in.)]
(2-3/4 in.) 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)
Tighten the ﬂ are nuts with a torque wrench using the speciﬁ 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.
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.
Dimension A [mm (in.)]
Pipe outside diameter
When using conventional ﬂ are tools to ﬂ are R410A pipes, the dimension A should be ap-
proximately 0.5 mm (1/32 in.) more than indicated in the table (for ﬂ aring with R410A ﬂ are
tools) to achieve the speciﬁ ed ﬂ aring. Use a thickness gauge to measure the dimension A.
Pipe outside diameter [mm (in.)]
Align the marks
Wall hook bracket
Check if [L] is flared uniformly
and is not cracked or scratched.
Dimension B [mm (in.)]
Flare tool for R410A,
0 to 0.5
(0 to 1/32)
Width across flats
of Flare nut [mm (in.)]
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 difﬁ cult
to bend or stretch them any more.
• Do not bend or stretch the pipes more than 3 times.
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
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 speciﬁ 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
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
Indoor unit pipe
Flare nut [mm (in.)]
6.35 (1/4) dia.
9.52 (3/8) dia.
12.70 (1/2) dia.
15.88 (5/8) dia.
19.05 (3/4) dia.
Tighten with 2 wrenches.
Tightening torque [N·m (lb·ft)]
16 to 18 (11.8 to 13.3)
32 to 42 (23.6 to 31.0)
49 to 61 (36.1 to 45.0)
63 to 75 (46.5 to 55.3)
90 to 110 (66.4 to 81.1)