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2. ABOUT THIS PRODUCT
2.1. Precautions for using the R410A refrigerant
WARNING
Do not introduce any substance other than the prescribed refrigerant into the refrigera-
tion cycle.
If air enters the refrigeration cycle, the pressure in the refrigeration cycle will become
abnormally high and cause the piping to rupture.
If there is a refrigerant leakage, make sure that it does not exceed the concentration
limit.
If a refrigerant leakage exceeds the concentration limit, it can lead to accidents such as
oxygen starvation.
Do not touch refrigerant that has leaked from the refrigerant pipe connections or other
area. Touching the refrigerant directly can cause frostbite.
If a refrigerant leakage occurs during operation, immediately vacate the premises and
thoroughly ventilate the area.
If the refrigerant comes in contact with a flame, it produces a toxic gas.
2.2. Special tool for R410A
WARNING
To install a unit that uses the R410A refrigerant, use dedicated tools and piping materi-
als that have been manufactured specifically for R410A use.
Because the pressure of the R410A refrigerant is approximately 1.6 times higher than
the R22, failure to use dedicated piping material or improper installation can cause
rupture or injury.
Furthermore, it can cause serious accidents such as water leakage, electric shock, or
fire.
Tool name
Contents of change
Gauge manifold
Pressure is huge and cannot be measured with a conventional (R22)
gauge. To prevent erroneous mixing of other refrigerants, the diam-
eter of each port has been changed.
It is recommended to use a gauge manifold with a high pressure
display range 500 microns to 768 psi (–0.1 to 5.3 MPa) and a low
pressure display range 500 microns to 551 psi (–0.1 to 3.8 MPa).
Charging hose
To increase pressure resistance, the hose material and base size
were changed.
Vacuum pump
A conventional (R22) vacuum pump can be used by installing a
vacuum pump adapter.
Be sure that the pump oil does not backflow into the system. Use
one capable for vacuum suction of 500 microns (–100.7 kPa).
Gas leakage
detector
Special gas leakage detector for HFC refrigerant R410A.
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
Operating manual
1
Installation manual
1
(This book)
Cable tie (large)
4
For fixing the connection pipe
(large and small)
Cable tie (medium)
2
For transmission and remote
controller cable binding.
Coupler heat
insulation (small)
1
For indoor side pipe joint (small)
Name and Shape
Q’ty
Application
Coupler heat
insulation (large)
1
For indoor side pipe joint (large)
Special nut A (large
flange)
4
For installing indoor unit
Special nut B
(small flange)
4
For installing indoor unit
Template
(carton top)
1
For ceiling openings cutting
Also used as packing
Drain hose
1
For installing drain pipe
(Ø 3/4 in [I.D.]; Ø 1-1/16 in [O.D.])
Hose band
1
For installing drain hose
Drain hose
insulation
1
For installing drain hose
Cassette grille accessories
Name and Shape
Q’ty
Application
Connector cover
1
For covering connector
Tapping screw
(M5 × 12mm)
4
For mounting cassette grille
Tapping screw
(M4 × 12mm)
1
For mounting connector cover
2.4. Optional parts
Description
Model
Application
Air outlet shutter plate UTR-YDZB
Install the plate at outlet when carrying out
3-way direction operation.
Insulation kit for high
humidity
UTZ-KXGC
Install when the condition under the roof is
over 80% in humidity and over 86 °F (30 °C)
in temperature.
Fresh air intake kit
UTZ-VXAA
To take fresh air.
External connect kit
UTY-XWZXZC
For output function
(Output terminal / CNB01)
UTY-XWZXZB
For control input function
(Apply voltage terminal / CNA01)
UTY-XWZXZD
For control input function
(Dry contact terminal / CNA02)
UTY-XWZXZ7
For forced thermostat off function
(Apply voltage terminal / CNA03)
UTY-XWZXZE
For forced thermostat off function
(Dry contact terminal / CNA04)
Wireless LAN adapter UTY-TFSXZ*
For wireless LAN control.
MODBUS® convertor UTY-VMSX
For connecting a single indoor unit system to
the Modbus® network.
External power sup-
ply unit
UTZ-GXXA
Supply power to the indoor unit PCB when
the indoor unit is turned off to prevent errors.
2.5. About unit of the length
This product is manufactured to metric units and tolerances. United States customary
units are provided for reference only. In cases where exact dimensions and tolerances are
required, always refer to metric units.
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