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1. SAFETY PRECAUTIONS
Be sure to read this Manual thoroughly before installation.•
The warnings and precautions indicated in this Manual •
contain important information pertaining to your safety. Be
sure to observe them.
Hand this Manual, together with the Operating Manual, to the •
customer. Request the customer to keep them on hand for
future use, such as for relocating or repairing the unit.
WARNING
This mark indicates procedures which, if
improperly performed, might lead to the
death or serious injury of the user.
•Request your dealer or a professional installer to install
the indoor unit in accordance with this Installation Manual.
An improperly installed unit can cause serious accidents
such as water leakage, electric shock, or fire. If the
indoor unit is installed in disregard of the instructions in
the Installation Manual, it will void the manufacturer’s
warranty.
•Do not turn ON the power until all work has been
completed. Turning ON the power before the work is
completed can cause serious accidents such as electric
shockorre.
•If refrigerant leaks while work is being carried out,
ventilate the area. If the refrigerant comes in contact with
aame,itproducesatoxicgas.
•Installation work must be performed in accordance with
national wiring standards by authorized personnel only.
CAUTION
This mark indicates procedures which,
if improperly performed, might possibly
result in personal harm to the user, or
damage to property.
2. ABOUT THE UNIT
1
2.1. Precautions for using R410A refrigerant
WARNING
•Donotintroduceanysubstanceotherthantheprescribed
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
suchasoxygenstarvation.
•Do not touch refrigerant that has leaked from the
refrigerant pipe connections or other area. Touching the
refrigerant directly can cause frostbite.
•Ifarefrigerantleakoccursduringoperation, immediately
vacate the premises and thoroughly ventilate the area. If
therefrigerantcomesincontactwithaame,itproduces
atoxicgas.
]1
2.2. Special tool for R410A
WARNING
•ToinstallaunitthatusesR410Arefrigerant,usededicated
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
waterleakage,electricshock,orre.
Tool name Changes
Gauge manifold
The pressure in the refrigerant
systemisextremelyhigh andcan-
not be measured with a conven-
tional gauge. To prevent erroneous
mixingofotherrefrigerants,the
diameter of each port has been
changed. It is recommended to
use a gauge manifold with a high
pressure display range of –0.1 to
5.3 MPa and a low pressure display
range of –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
–100.7 kPa (5 Torr, –755 mmHg).
Gas leakage detector
Special gas leakage detector for
R410A refrigerant.
]1
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,orre.
• Thefollowinginstallationpartsarefurnished.Usethemas
required.
• KeeptheInstallationManualinasafeplaceanddonot
discard any other accessories until the installation work has
been completed.
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