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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 leak, make sure that it does not exceed the concentration limit.
If a refrigerant leak 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 leak occurs during operation, immediately vacate the premises and thor-
oughly 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 R410A refrigerant, use dedicated tools and piping materials that
have been manufactured specifically for R410A use. Because the pressure of 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 Changes
Gauge manifold
The pressure in the refrigerant system is extremely high 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 of 500 microns to
768 psi (–0.1 to 5.3 MPa) and a low pressure display range of
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.
(The charging port thread diameter for R410A is 1/2 UNF 20
threads per inch.)
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 R410A refrigerant.
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 falling, 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.
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 insula-
tion
(small)
1
For indoor side pipe joint
(small)
Coupler heat insula-
tion
(large)
1
For indoor side pipe joint
(large)
Name and Shape Q’ty Application
Special nut A
(large flange)
4
For suspending the indoor
unit from ceiling
Special nut B
(small flange)
4
Washer
8
Drain hose
(large)
1
For installing drain pipe
(for main drain port)
Drain hose
(small)
1
For installing drain pipe
(for safety drain port)
Hose band
(large)
1
For installing drain hose
(large)
(for main drain port)
Hose band
(small)
1
For installing drain hose
(small)
(for safety drain port)
Drain hose insulation
2
For installing drain hose
2.4. Optional parts
The following options are available.
Description Model Application
IR receiver unit UTY-TRHX For the wireless remote controller.
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 supply
unit
UTZ-GXXA
Supply power to the indoor unit PCB
when the indoor unit is turned off to
prevent errors.
When installing, please refer to the installation manual of each optional part.
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.
9365748336-01_IM.indb Sec1:29365748336-01_IM.indb Sec1:2 9/16/2019 1:14:17 PM9/16/2019 1:14:17 PM
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