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2. ABOUT THE UNIT
1
2.1. Precautions for using R410A refrigerant
Do not introduce any substance other than the prescribed refrigerant into the
refrigeration 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
thoroughly ventilate the area. If the refrigerant comes in contact with a flame, it
produces a toxic gas.
] 1
2.2. Special tool for R410A
To install a unit that uses R410A refrigerant, use dedicated tools and piping materials 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 fi re.
Tool name
The pressure in the refrigerant system is extremely
high 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
Gauge manifold
manifold with a high pressure display range of
30in.Hg to 768 psi (–0.1 to 5.3 MPa) and a low
pressure display range of 30in.Hg to 551 psi (–0.1
to 3.8 MPa).
To increase pressure resistance, the hose material
and base size were changed.
Charging hose
(The charging port thread diameter for R410A is 1/2
UNF 20 threads per inch.)
A conventional (R22) vacuum pump can be used by
installing a vacuum pump adapter.
Be sure that the pump oil does not backflow into
Vacuum pump
the system. Use one capable for vacuum suction of
5 Torr, –755 mmHg (–100.7 kPa).
Special gas leakage detector for R410A refrigerant.
Gas leakage detector
1
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 fi re.
• 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.
WARNING
WARNING
Changes
WARNING
Name and Shape
Operating Manual
Installation Manual
Drain hose
Hose Band
Drain hose insulation
VT wire
Coupler heat insulation
(Large)
Coupler heat insulation
(Small)
Binder
Special nut A
(Large fl ange)
Special nut B
(Small fl ange)
Installation
template
Auxiliary pipe assembly
Grommet edging
]
2.4. Optional parts
The following options are available.
Parts name
UTR-DPB24T
Drain pump unit
P/N 9050642000
UTD-RF204
Round duct
P/N 9093160004
External output wire
P/N 9379529006
External input (voltage) wire
P/N 9368779016
External input (no voltage) wire
P/N 9368779009
Q'ty
Application
1
(This book)
1
For installing drain pipe
Φ 3/4 in. (19 mm) [I.D.],
Φ 1-1/16 in. (27 mm) [O.D.]
1
For installing drain hose
1
Adhesive type
8-21/32 × 3-15/16 in.
(220 × 100 mm)
1
For fi xing the drain hose
L 11-1/32 in. (280 mm)
1
For indoor side pipe joint
(Gas pipe)
2
For indoor side pipe
joint (Liquid pipe)
1
Extra
For fi xing the coupler
large
heat insulation
4
Large
4
Medium
For power supply and
3
transmission and remote
controller cable binding
For installing indoor unit
4
For installing indoor unit
4
For positioning the indoor unit
1
For connecting the piping
1
For wiring connecting port.
(Not use for U.S.A. and Canada)
1
Model No.
Application
For control output port
For control input port
For control input port
En-2
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