En-3
2.3. Accessories
WARNING
• For installation purposes, be sure to use the parts supplied by the manufacturer or
other prescribed parts.
The use of non-prescribed parts can cause serious accidents such as the unit to fall,
water leakage, electric shock, or fire.
• The following installation parts are furnished. Use them as required.
• Keep the Installation Manual in a safe place and do not discard any other accessories
until the installation work has been completed.
Do not discard any accessories needed for installation until the installation work has
been completed.
Name and Shape
Q’ty
Application
Installation Manual
(Indoor unit)
1
(This manual)
Operating Manual
(Indoor unit)
1
Operating Manual
(CD-ROM)
1
Special nut A
(Large flange)
4
For suspending the indoor unit from
ceiling
Special nut B
(Small flange)
4
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 (Small)
1
For fixing the remote controller
cable
Remote controller
1
Screw
(M4 × 16)
2
For installing indoor unit remote
controller
Remote controller cable
1
For connecting the remote controller
2.4. Optional parts
Parts name
Model No.
Application
Simple remote controller
UTY-RSN*M
For air conditioner operation
Wired remote controller
UTY-RNN*M
For air conditioner operation
(3-wire type)
Remote sensor unit
UTY-XSZX
Room temperature sensor
External connect kit
UTD-ECS5A
For control input/output port
Long life filter
UTD-LF60KA
3. GENERAL SPECIFICATION
3.1. Selecting the pipe material
CAUTION
Do not use existing pipes.
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 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 in
-
curs pressure higher than when using conventional 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.
Pipe outside diameter [mm (in.)]
Thickness [mm]
6.35 (1/4)
0.8
9.52 (3/8)
0.8
12.70 (1/2)
0.8
15.88 (5/8)
1.0
19.05 (3/4)
1.2
3.2. 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.
Diameter [mm (in.)]
Liquid
9.52 (3/8)
Gas
15.88 (5/8)
• 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 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 70-80 %, use heat insulation that is 15 mm or thicker
and if the expected humidity exceeds 80 %, use heat insulation that is 20 mm or
thicker. If heat insulation is used that is not as thick as specified, 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 20 °C).
3.3. 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, confirm related regulations, codes, or standards.
Cable
Conductor size
(mm
2
)
Type
Remarks
Connection
cable
1.5 (MIN.)
Type 60245 IEC57
3Wire+Earth (Ground),
1φ 230V
Max. Cable Length: Limit voltage drop to less than 2%. Increase cable gauge if voltage
drop is 2% or more.
Cable
Conductor size
(mm
2
)
Type
Remarks
Remote
controller cable
(3-wire type)
0.33
Use sheathed
PVC cable.
(Accessories)
Polar 3-wired
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