En-2
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 speci
fi
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
Contents of change
Gauge manifold
Pressure is huge and cannot be measured with a conventional
(R22) 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 30 in.Hg to 768 psi (–0.1 to 5.3 MPa) and a low
pressure display range 30 in.Hg to 551 psi (–0.1 to 3.8 MPa).
Charging hose
To increase pressure resistance, the hose material and base
size were changed.
Vacuum pump
A conventional (R22) 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 5 Torr, –755 mm Hg (–100.7 kPa).
Gas leakage
detector
Special gas leakage detector for HFC refrigerant R410A.
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 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.
Name and Shape
Q’ty
Application
Operation Manual
1
Installation Manual
1
(This book)
Cable tie (Large)
4
For
fi
xing the connection
pipe (Large and Small)
Cable tie (Medium)
2
For transmission and remote
controller cable binding.
Coupler heat insulation
(Small)
1
For indoor side pipe joint (Small)
Coupler heat insulation
(Large)
1
For indoor side pipe joint (Large)
Template (Carton top)
1
For installing indoor unit.
Washer
8
For installing indoor unit.
Drain hose insulation
1
For installing drain hose
Drain Hose
1
For installing drain pipe
(Ø 3/4 in. [I.D.]; Ø 1-1/16 in. [O.D.])
Hose Band
1
For installing drain hose
Drain Pipe Insulation
1
For installing drain pipe
2.4. Optional parts
Description
Model
Application
External connect kit
UTY-XWZXZC
For output function
(Output terminal / CNB01)
UTY-XWZXZB
For control input function
(Apply voltage terminal / CNA01)
UTY-XWZXZD
For control input function
(Dry contact terminal / CNA02)
UTY-XWZXZ7
For forced thermostat off function
(Apply voltage terminal / CNA03)
UTY-XWZXZE
For forced thermostat off function
(Dry contact terminal / CNA04)
2.5. About unit of the length
All Fujitsu General products are manufactured to metric units and tolerances. United
States customary units are provided for reference only. In cases where exact dimensions
and tolerances are required, always refer to metric units.
3. INSTALLATION WORK
Correct initial installation location is important because it is dif
fi
cult to move unit after it is
installed.
3.1. Selecting an installation location
WARNING
Select installation locations that can properly support the weight of the indoor. Install
the units securely so that they do not topple or fall.
CAUTION
Do not install the unit in the following areas:
• Area with high salt content, such as at the seaside.
It will deteriorate metal parts, causing the parts to fail or the unit to leak water.
• Area
fi
lled with mineral oil or containing a large amount of splashed oil or steam,
such as a kitchen.
It will deteriorate plastic parts, causing the parts to fail or the unit to leak water.
• Area that generates substances that adversely affect the equipment, such as sulfuric
gas, chlorine gas, acid, or alkali.
It will cause the copper pipes and brazed joints to corrode, which can cause
refrigerant leakage.
• Area that can cause combustible gas to leak, contains suspended carbon
fi
bers or
fl
ammable dust, or volatile in
fl
ammables such as paint thinner or gasoline.
If gas leaks and settles around the unit, it can cause a
fi
re.
• Area where animals may urinate on the unit or ammonia may be generated.
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