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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 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
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
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.
Gauge manifold
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).
To increase pressure resistance, the hose material and base size
Charging hose
were changed.
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 HFC refrigerant R410A.
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 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
Operating manual
Installation manual
Cable tie (large)
Cable tie (medium)
Coupler heat
insulation
(small)
Coupler heat
insulation
(large)
WARNING
WARNING
Changes
WARNING
Q'ty
Application
1
(This book)
1
For fixing the connection pipe
(large and small) and drain
5
cap
For transmission and remote
3
controller cable binding
For indoor side pipe joint
(small)
1
For indoor side pipe joint
(large)
1
Special nut A
(large flange)
Special nut B
(small flange)
Hanger
Drain hose
Hose band
Drain hose insula-
tion
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)
1-9/16 (40)
Round flange
Model name: UTD–RF204 (P/N 9093160004)
3-3/8 (85)
Long-life filter
Model name: UTD–LF25NA (P/N 9079892004)
19-15/16 (507)
For suspending the indoor unit
from ceiling
4
4
For suspending the indoor unit
from ceiling
4
For installing drain pipe
1
Φ 3/4 in (19 mm) [I.D.],
Φ 1-1/16 in (27 mm) [O.D.]
For installing drain hose
1
Insulates the drain hose and
2
drain cap
41-7/8 (1,063)
Unit: in (mm)
Unit: in (mm)
En-2
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