Safety Precautions; About The Unit; Precautions For Using R410A Refrigerant; Special Tool For R410A - Fujitsu RCF24LBL Installation Manual

1. SAFETY PRECAUTIONS

• Be sure to read this Manual thoroughly before installation.
• The warnings and precautions indicated in this Manual con-
tain 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,
WARNING if improperly performed, might lead to
the death or serious injury of the user.
• Request your dealer or a professional installer to in-
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
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-
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
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

2.1. Precautions for using R410A
refrigerant
WARNING
• Do not introduce any substance other than the pre-
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
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-
ant pipe connections or other area. Touching the refriger-
ant 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 fl ame, it produces
a toxic gas.
En-2

2.2. Special tool for R410A

WARNING
• To install a unit that uses R410A refrigerant, use dedicat-
ed tools and piping materials that have been manufac-
tured specifi 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
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
Gauge manifold 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.
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.
Vacuum pump Be sure that the pump oil does
not backfl ow 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.
Changes