En-2
1. SAFETY PRECAUTIONS
Be sure to read this Manual thoroughly before installation.
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The warnings and precautions indicated in this Manual con-
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tain important information pertaining to your safety. Be sure
to observe them.
Hand this Manual, together with the Operating Manual, to
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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 in-
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stall the indoor unit in accordance with this Installation
Manual. An improperly installed unit can cause serious
accidents such as water leakage, electric shock, or
fi
re. 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
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completed. Turning ON the power before the work is
completed can cause serious accidents such as electric
shock or
fi
re.
If refrigerant leaks while work is being carried out, ven-
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tilate the area. If the refrigerant comes in contact with a
fl
ame, it produces a toxic gas.
Installation work must be performed in accordance with
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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.
2.2. Special tool for R410A
WARNING
To install a unit that uses R410A refrigerant, use dedicat-
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ed tools and piping materials that have been manufac-
tured speci
fi
cally 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
Changes
Gauge manifold
The pressure in the refrigerant
system is extremely high and can-
not be measured with a conven-
tional 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 of –0.1 to
5.3 MPa and a low pressure dis-
play 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 back
fl
ow 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.
2. ABOUT THE UNIT
2.1. Precautions for using R410A
refrigerant
WARNING
Do not introduce any substance other than the pre-
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scribed 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
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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 refriger-
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ant pipe connections or other area. Touching the refriger-
ant directly can cause frostbite.
If a refrigerant leak occurs during operation, immediately
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vacate the premises and thoroughly ventilate the area. If
the refrigerant comes in contact with a
fl
ame, it produces
a toxic gas.
