En-5
B-4. Installing indoor unit
Reset the hex bolts as shown in the
fi
gure
Unit: in.(mm)
Indoor unit
Hex bolt
5/16 to 1/2
(8 to 13)
Apply the indoor unit to the brackets.
Indoor unit
Bolt
Bracket
Now, securely tighten the hex bolts in both sides.
3.3.3. Barrier and RFM base removal and installation
(1) Remove the barriers by removing the 4
fi
xing screws (2 screws each).
(2) Remove the RFM base by removing the 2
fi
xing screws and unhooking the 1 hook.
(3) After completing the work, install the barriers and RFM base as they were originally.
RFM base
Fixing screw
(2 positions)
Barriers
Fixing screw
(2 positions)
Hook
Install the barriers in the correct direction.
4. PIPE INSTALLATION
]
CAUTION
Be more careful that foreign matter (oil, water, etc.) does not enter the piping than with
refrigerant R410A models. Also, when storing the piping, securely seal the openings
by pinching, taping, etc.
While welding the pipes, be sure to blow dry nitrogen gas through them.
]1
4.1. Selecting the pipe material
CAUTION
Do not use existing pipes from another refrigeration system or refrigerant.
Use pipes that have clean external and internal sides without any contamination which
may cause trouble during use, such as sulfur, oxide, dust, cutting waste, oil, or water.
It is necessary to use seamless copper pipes.
Material : Phosphor deoxidized seamless copper pipes It is desirable that the amount
of residual oil is less than 0.04 oz /100 ft. (40 mg/10 m).
Do not use copper pipes that have a collapsed, deformed, or discolored portion
(especially on the interior surface). Otherwise, the expansion valve or capillary tube
may become blocked with contaminants.
Improper pipe selection will degrade performance. As an air conditioner using R410A
incurs pressure higher than when using conventional (R22) refrigerant, it is necessary
to choose adequate materials.
• Thicknesses of copper pipes used with R410A are as shown in the table.
• Never use copper pipes thinner than those indicated in the table even if they are
available on the market.
Thicknesses of Annealed Copper Pipes (R410A)
Pipe outside diameter [in. (mm)]
Thickness [in. (mm)]
1/4 (6.35)
0.032 (0.80)
3/8 (9.52)
0.032 (0.80)
1/2 (12.70)
0.032 (0.80)
5/8 (15.88)
0.039 (1.00)
3/4 (19.05)
0.047 (1.20)
1
4.2. Pipe requirement
CAUTION
Refer to the Installation Manual of the outdoor unit for description of the length of
connecting pipe or for difference of its elevation.
• Use pipe with water-resistant heat insulation.
CAUTION
Install heat insulation around both the gas and liquid pipes. Failure to do so may
cause water leaks.
Use heat insulation with heat resistance above 248°F (120°C). (Reverse cycle model
only)
In addition, if the humidity level at the installation location of the refrigerant piping is
expected to exceed 70 %, install heat insulation around the refrigerant piping.
If the expected humidity level is 70 to 80 %, use heat insulation that is 9/16 in. (15 mm)
or thicker and if the expected humidity exceeds 80 %, use heat insulation that is 13/16 in.
(20 mm) or thicker. If heat insulation is used that is not as thick as speci
fi
ed, condensation
may form on the surface of the insulation.
In addition, use heat insulation with heat conductivity of 0.045 W/(m·K) or less (at 68°F
(20°C)).
1
4.3. Flare connection (pipe connection)
WARNING
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 a hazardous gas if the refrigerant comes into contact with a
fl
ame.
4.3.1. Flaring
Use special
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 and outdoor units (or
RB unit) respectively) onto the pipe and perform the
fl
are processing with a
fl
are tool.
Use the special R410A
fl
are tool. Leakage 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.
L
Check if [L] is
fl
ared uniformly and
is not cracked or scratched.
Die
Pipe
A
B
Pipe outside diameter
[in. (mm)]
Dimension A [in. (mm)]
Dimension B
0 (0)
-0.015 (-0.4)
[in. (mm)]
Flare tool for R410A,
clutch type
1/4 (6.35)
0 to 0.020 (0 to 0.5)
3/8 (9.1)
3/8 (9.52)
1/2 (13.2)
1/2 (12.70)
5/8 (16.6)
5/8 (15.88)
3/4 (19.7)
3/4 (19.05)
15/16 (24.0)
When using conventional (R22)
fl
are tools to
fl
are R410A pipes, the dimension A should
be approximately 0.020 in. (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. It is recommended that a R410A
fl
aring tool is used.
Pipe outside diameter
[in. (mm)]
Width across flats of Flare
nut [in. (mm)]
1/4 (6.35)
11/16 (17)
3/8 (9.52)
7/8 (22)
1/2 (12.70)
1 (26)
5/8 (15.88)
1-1/8 (29)
3/4 (19.05)
1-7/16 (36)
4.3.2. Bending pipes
• The pipes are shaped by your hands or pipe bender. 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.
Width across
fl
ats
9367701124-03_IM.indb Sec1:5
9367701124-03_IM.indb Sec1:5
2013-10-25 13:00:40
2013-10-25 13:00:40
