About This Product; Precautions For Using The R410A Refrigerant; Special Tool For R410A; Accessories - Fujitsu AIRSTAGE ARUM24TLAV Installation Manual

• 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
Request your dealer or a professional installer to install the unit in accordance with this
Manual.
An improperly installed unit can cause serious accidents such as water leakage,
electric shock, or fi re.
If the 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, ventilate the area.
If the refrigerant comes in contact with a fl ame, it produces a toxic gas.
Installation must be performed in accordance with the requirement of NEC (National
Electrical Code) and CEC (Canadian Electrical Code) by authorized personnel only.
Except for EMERGENCY, never turn off main as well as sub breaker of the indoor units
during operation. It will cause compressor failure as well as water leakage. First, stop
the indoor unit by operating the control unit, converter or external input device and then
cut the breaker.
Make sure to operate through the control unit, converter or external input device.
When the breaker is designed, locate it at a place where the users cannot start and
stop in the daily work.

2. ABOUT THIS PRODUCT

2.1. Precautions for using the 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 leakage, make sure that it does not exceed the concentration
limit.
If a refrigerant leakage 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 leakage 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.

2.2. Special tool for R410A

WARNING
To install a unit that uses the R410A refrigerant, use dedicated tools and piping
materials that have been manufactured specifi cally for R410A use.
Because the pressure of the 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
Pressure is huge and cannot be measured with a
conventional (R 22) gauge. To prevent erroneous
mixing of other refrigerants, the diameter of each port
has been changed.
Gauge manifold
It is recommended to use a gauge manifold with a
high pressure display range 30in.Hg to 768 psi (– 0.1
to 5.3 MPa) and a low pressure display range 30in.
Hg to 551 psi (– 0.1 to 3.8 MPa).
To increase pressure resistance, the hose material and
Charging hose
base size were changed.
A conventional (R22) 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 5 Torr,
–755 mmHg (–100.7 kPa).
Special gas leakage detector for HFC refrigerant
Gas leakage detector
R410A.
Changes

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 to fall,
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.
Do not discard any accessories needed for installation until the installation work has been
completed.
Name and Shape
Operating Manual
Installation Manual
Cable tie (Large)
Cable tie (Medium)
Coupler heat insulation
(Small)
Coupler heat insulation
(Large)
Special nut A
(Large flange)
Special nut B
(Small flange)
Hanger
Drain hose
Hose band
Drain hose insulation
WARNING
Q'ty Application
1
(This book)
1
For fixing the connection pipe (Large
and Small) and drain cap
5
For transmission and remote
controller cable binding
3
For indoor side pipe joint (Small)
1
For indoor side pipe joint (Large)
1
For suspending the indoor unit from
ceiling
4
4
For suspending the indoor unit from
ceiling
4
For installing drain pipe
Φ 3/4 in. (19 mm) [I.D.],
1
Φ 1-1/16 in. (27 mm) [O.D.]
For installing drain hose
1
Insulates the drain hose and drain
cap
2
En-2