En-2
WARNING
Except for EMERGENCY, never turn off main as well as sub breaker of the indoor units
during operation. It will cause compressor failure as well as water leakage.
First, stop the indoor unit by operating the control unit, converter or external input de-
vice and then cut the breaker. Make sure to operate through the control unit, converter
or external input device.
When the breaker is designed, locate it at a place where the users cannot start and stop
in the daily work.
Cancer and Reproductive Harm - www.P65Warnings.ca.gov
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 for R22 tool
Gauge manifold
Pressure is huge and cannot be measured with a conventional
(R22) gauge. To prevent erroneous mixing of other refrigerants,
the diameter 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.
•
A conventional vacuum pump can be used by installing a
vacuum pump adapter.
•
Be sure that the pump oil does not back flow 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)
Name and Shape
Q’ty
Application
Installation
template
1
For positioning the indoor unit
Washer
8
For installing indoor unit
Coupler heat insu-
lation (large)
1
For indoor side pipe joint (large
pipe)
Coupler heat insu-
lation (small)
1
For indoor side pipe joint (small
pipe)
Cable tie (me-
dium)
2
For transmission and remote
controller cable binding
Cable tie (large)
4
For fixing the coupler heat
insulation.
Filter (small)
2
(AR7/9/
12/14)
Filter (large)
2
(AR18)
Drain hose
1
For installing drain pipe
Φ 3/4 in (19 mm) [I.D.],
Φ 1-1/16 in (27 mm) [O.D.]
Hose band
1
For installing drain hose
Drain hose insula-
tion B
1
Insulates the drain hose
2.4. Optional parts
Description
Model
Application
IR receiver unit
UTY-TRHX
For the wireless remote controller.
Auto louver grille
UTD-G*S*-W
For Auto louver grille
Remote sensor
UTY-XSZX
Room temperature sensor
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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