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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 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
The pressure in the refrigerant system is extremely high and cannot be
measured with a conventional gauge. To prevent erroneous mixing of
Gauge
other refrigerants, the diameter of each port has been changed. It is rec-
manifold
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).
To increase pressure resistance, the hose material and base size were
Charging
changed.
hose
(The charging port thread diameter for R410A is 1/2 UNF 20 threads
per inch.)
A conventional vacuum pump can be used by installing a vacuum pump
Vacuum
adapter.
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
Cover plate (left)
Cover plate
(right)
Tapping screw
(M4 × 10mm)
Installation
template
Bracket (left)
Bracket (right)
Special nut
WARNING
WARNING
Changes
WARNING
Q'ty
Application
1
(This book)
1
1
1
2
For positioning the indoor unit
1
For under ceiling type
For suspending the indoor unit
1
from ceiling
1
4
Name and Shape
Wall bracket
Tapping screw
(M4 × 20 mm)
Coupler heat
insulation
Cable tie (large)
Cable tie (me-
dium)
Drain hose
Hose band
Drain hose
insulation
VT wire
Insulation (pipe)
Silencer pipe
2.4. Optional parts
Description
Model No.
Auxiliary pipe
9374714025
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 unit
UTZ-GXXA
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 on
2
the wall
For fi xing the wall bracket
6
For indoor side pipe joint
2
For fi xing the coupler heat insula-
4
tion
For power supply, transmission
2
and remote controller cable bind-
ing
For installing drain pipe
Ø 3/4 in (19 mm) [I.D.],
1
Ø 1-1/16 in (27 mm) [O.D.]
For installing drain hose
1
Adhesive type
3-15/16 × 8-11/16 in
1
(100 × 220 mm)
For fi xing the drain hose
L 11 in (280 mm)
1
Adhesive type
6-5/16 × 4-5/16 in
1
(160 × 110 mm)
Connect the silencer pipe to the
small (liquid) pipe.
1
Application
For indoor side pipe joint
(for AB24)
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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