En-2
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 leakage, make sure that it does not exceed the concentration
limit.
If a refrigerant leakage 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 leakage occurs during operation, immediately vacate the premises and
thoroughly 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 the R410A refrigerant, use dedicated tools and piping materi-
als that have been manufactured specifically for R410A use.
Because the pressure of the 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
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.
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 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 to fall,
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.
Do not discard any accessories needed for installation until the installation work has been
completed.
Name and Shape Q’ty Application
Operating manual
1
Installation manual
1
(This book)
Cable tie (large)
5
For fixing the connection pipe
(large and small) and drain
cap
Cable tie (medium)
3
For transmission and remote
controller cable binding
Coupler heat
insulation
(small)
1
For indoor side pipe joint
(small)
Coupler heat
insulation
(large)
1
For indoor side pipe joint
(large)
Special nut A
(large flange)
4
For suspending the indoor unit
from ceiling
Special nut B
(small flange)
4
Hanger
4
For suspending the indoor unit
from ceiling
Drain hose
1
For installing drain pipe
Φ 3/4 in (19 mm) [I.D.],
Φ 1-1/16 in (27 mm) [O.D.]
Hose band
1
For installing drain hose
Drain hose insula-
tion
2
Insulates the drain hose and
drain cap
2.4. Optional parts
When connecting the square duct and round duct, use the optional square flange or round
flange.
Square flange
Model name: UTD–SF045T (P/N 9098180007)
41-7/8 (1,063)
1-9/16 (40)
8-1/8 (206)
Round flange
Model name: UTD–RF204 (P/N 9093160004)
3-3/8 (85)
7-11/16 (195)
8-1/16 (205)
8-7/8
(225)
9-1/4 (235)
Unit: in (mm)
Long-life filter
Model name: UTD–LF25NA (P/N 9079892004)
19-15/16 (507)
11-9/16 (293)
Unit: in (mm)
9373385264-02_IM_L3.indb Sec1:29373385264-02_IM_L3.indb Sec1:2 9/24/2019 11:06:28 AM9/24/2019 11:06:28 AM
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