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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 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 dedi-
cated 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 gauge. To prevent erroneous mixing of
other refrigerants, the diameter of each port has been changed. It is rec-
ommended 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 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)
Cover plate (left)
1
Cover plate
(right)
1
Tapping screw
(M4 × 10mm)
2
Installation
template
1
For positioning the indoor unit
For under ceiling type
Bracket (left)
1
For suspending the indoor unit
from ceiling
Bracket (right)
1
Special nut
4
Name and Shape Q’ty Application
Wall bracket
2
For suspending the indoor unit on
the wall
Tapping screw
(M4 × 20 mm)
6
For fi xing the wall bracket
Coupler heat
insulation
2
For indoor side pipe joint
Cable tie (large)
4
For fi xing the coupler heat insula-
tion
Cable tie (me-
dium)
2
For power supply, transmission
and remote controller cable bind-
ing
Drain hose
1
For installing drain pipe
Ø 3/4 in (19 mm) [I.D.],
Ø 1-1/16 in (27 mm) [O.D.]
Hose band
1
For installing drain hose
Drain hose
insulation
1
Adhesive type
3-15/16 × 8-11/16 in
(100 × 220 mm)
VT wire
1
For fi xing the drain hose
L 11 in (280 mm)
Insulation (pipe)
1
Adhesive type
6-5/16 × 4-5/16 in
(160 × 110 mm)
Silencer pipe
1
Connect the silencer pipe to the
small (liquid) pipe.
2.4. Optional parts
Description Model No. Application
Auxiliary pipe
9374714025
For indoor side pipe joint
(for AB24)
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.
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.
9367701162-02_IM.indb Sec1:29367701162-02_IM.indb Sec1:2 27/09/2019 09:32:5627/09/2019 09:32:56
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