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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.
This mark indicates procedures which, if
WARNING
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
shock or fire.
• If refrigerant leaks while work is being carried out,
ventilate the area. If the refrigerant comes in contact with
a flame, it produces a toxic gas.
• Installation work must be performed in accordance with
national wiring standards by authorized personnel only.
This mark indicates procedures which,
if improperly performed, might possibly
CAUTION
result in personal harm to the user, or
damage to property.
2. ABOUT THE UNIT
1
2.1. Precautions for using R410A refrigerant
WARNING
• 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.
En-2
] 1
2.2. Special tool for R410A
WARNING
• 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 fire.
Tool name
Changes
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
Gauge manifold
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.
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 vacuum pump can be
used by installing a vacuum pump
adapter.
Be sure that the pump oil does
Vacuum pump
not backflow into the system. Use
one capable for vacuum suction of
–100.7 kPa (5 Torr, –755 mmHg).
Special gas leakage detector for
Gas leakage detector
R410A refrigerant.
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