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2. ABOUT THIS PRODUCT
2.1. Precautions for using the R410A refrigerant
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
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
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
Gauge manifold
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).
To increase pressure resistance, the hose material and base size
were changed.
Charging hose
(The charging port thread diameter for R410A is 1/2 UNF 20
threads per inch.)
A conventional (R22) vacuum pump can be used by installing a
vacuum pump adapter.
Vacuum pump
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
Special gas leakage detector for R410A refrigerant.
detector
2.3. Accessories
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
Operating manual
Installation manual
Cable tie (large)
Cable tie (medium)
Coupler heat insula-
tion
(small)
Coupler heat insula-
tion
(large)
WARNING
WARNING
Changes
WARNING
Q'ty
Application
1
(This book)
1
For fixing the connection pipe
(large and small)
4
For transmission and remote
controller cable binding
2
For indoor side pipe joint
(small)
1
For indoor side pipe joint
(large)
1
Name and Shape
Special nut A
(large flange)
Special nut B
(small flange)
Washer
Drain hose
(large)
Drain hose
(small)
Hose band
(large)
Hose band
(small)
Drain hose insulation
2.4. Optional parts
The following options are available.
Description
Model
IR receiver unit
UTY-TRHX
Remote sensor
UTY-XSZX
UTY-XWZXZC
UTY-XWZXZB
External connect kit
UTY-XWZXZD
UTY-XWZXZ7
UTY-XWZXZE
Wireless LAN adapter
UTY-TFSXZ*
MODBUS® convertor
UTY-VMSX
External power supply
UTZ-GXXA
unit
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.
Q'ty
Application
For suspending the indoor
unit from ceiling
4
4
8
For installing drain pipe
1
(for main drain port)
For installing drain pipe
1
(for safety drain port)
For installing drain hose
(large)
1
(for main drain port)
For installing drain hose
(small)
1
(for safety drain port)
For installing drain hose
2
Application
For the wireless remote controller.
Room temperature sensor
For output function
(Output terminal / CNB01)
For control input function
(Apply voltage terminal / CNA01)
For control input function
(Dry contact terminal / CNA02)
For forced thermostat off function
(Apply voltage terminal / CNA03)
For forced thermostat off function
(Dry contact terminal / CNA04)
For wireless LAN control.
For connecting a single indoor unit
system to the Modbus® network.
Supply power to the indoor unit PCB
when the indoor unit is turned off to
prevent errors.
En-2
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