En-2
2. ABOUT THIS PRODUCT
2.1. Precautions for using 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 tools for R410A
WARNING
To install a unit that uses R410A refrigerant, use dedicated tools and piping materi-
als 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 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 sys-
tem. 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 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)
Wall hook bracket
1
For indoor unit installation.
Tapping screw (M4 × 25 mm)
8
For wall hook bracket installation.
Drain hose Insulation
1
For installing drain hose
Cloth tape
1
For indoor unit installation.
Cable tie
(30/36
model)
2
For transmission and remote controller
cable binding.
Air cleaning filter
(30/36
model)
2
For installation, refer to the “CLEANING
AND CARE” in the operating manual.
Air cleaning filter frame
(30/36
model)
2
2.4. Optional parts
Description Model Application
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 termi-
nal / 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 Mod-
bus® 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.
9373370475-01_IM.indb 29373370475-01_IM.indb 2 9/16/2019 2:31:24 PM9/16/2019 2:31:24 PM
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