En-3
2. 5. Electrical requirement
The indoor unit is powered from the outdoor unit. Do not power indoor unit from separate
power source.
WARNING
Standard for electrical wiring and equipment differs in each country or region. Before
you start electrical working, con
fi
rm related regulations, codes, or standards.
Cable
Conductor size
(AWG)
Remarks
Connection cable
AWG 18 to 16
3Wire+Earth (Ground),
1Ø 208/230V
Cable Length: Limit voltage drop to less than 2%. Increase cable gauge if voltage drop is
2% or more.
Cable
Conductor size
(AWG)
Remarks
Remote controller cable (2-wire type)
AWG 22 to 16
Non-polar 2-wired,
twisted pair
2. 6. Optional parts
Refer to each installation manual for the method of installing optional parts.
Parts name
Model No.
Application
Wired remote controller
UTY-RNRUZ2
For air conditioner operation
(2-wired type)
Simple remote controller
UTY-RSRY
For air conditioner operation
(2-wired type)
UTY-RHRY
W-LAN interface
UTY-TFSXZ2
For wireless LAN control
IR receiver unit
UTY-LBTUM
For air conditioner operation
Thermostat convertor
UTY-TTRX
For air conditioner operation
External input and output
PCB
UTY-XCSX
For connecting external
devices
External input and output
PCB bracket
UTZ-GXNA
For installing the External input
and output PCB
External connect kit
UTY-XWZXZG
For control output port
Air
fi
lter kit
UTD-LFNA/B/C
LFNA : 36/42/48 model
LFNB : 18/24/30 model
LFNC : 12 model
2. 7. 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 (es-
pecially 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)
0.039 (1.20)
Name and Shape
Q’ty
Description
Operating Manual
1
Installation Manual
(indoor unit)
1
(This book)
Special nut A
(large
fl
ange)
4
For suspending the indoor unit
from ceiling
Special nut B
(small
fl
ange)
4
Washer
8
Coupler heat insulation (large)
1
For indoor side pipe joint
(gas pipe)
Coupler heat insulation (small)
1
For indoor side pipe joint
(liquid pipe)
Cable tie (large)
4
For
fi
xing the heat insulation
Cable tie (medium)
1
For
fi
xing the remote controller
cable
Cable tie (small)
1
For
fi
xing the remote controller
cable
Drain hose insulation
1
Insulates the drain hose and
vinyl hose
Drain hose
1
For installing drain pipe
(Ø 1 in [I.D.], Ø 1-1/4 in [O.D.])
Hose Band
1
For installing drain hose
2. 4. Pipe requirement
CAUTION
Refer to the installation manual of the outdoor unit for description of the length of con-
necting pipe or for difference of its elevation.
Model
Diameter [in (mm)]
Gas pipe
Liquid pipe
12
3/8 (9.52)
1/4 (6.35)
18
1/2 (12.70)
1/4 (6.35)
24/30/36/42/48
5/8 (15.88)
3/8 (9.52)
• 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 specified, condensa-
tion 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)).
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