About The Unit; Precautions For Using R410A Refrigerant; Special Tools For R410A; Accessories - Fujitsu aoyg30letl Installation Manual

2. ABOUT THE UNIT

2.1. Precautions for using R410A refrigerant

Do not touch refrigerant that has leaked from the refrigerant pipe connections or other
areas. 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.
The basic installation work procedures are the same as conventional refrigerant models.
However, pay careful attention to the following points:
• Since the working pressure is 1.6 times higher than that of conventional refrigerant
(R22) models, some of the piping and installation and service tools are special. (See
the table below.)
Especially, when replacing a conventional refrigerant (R22) model with a new
refrigerant R410A model, always replace the conventional piping and flare nuts with
the R410A piping and flare nuts.
• Models that use refrigerant R410A have a different charging port thread diameter
to prevent erroneous charging with conventional refrigerant (R22) and for safety.
Therefore, check beforehand. [The charging port thread diameter for R410A is
1/2 UNF 20 threads per inch.]
• Be careful that foreign matter (oil, water, etc.) does not enter the piping than with
refrigerant models. Also, when storing the piping, securely seal the openings by
pinching, taping, etc.
• When charging the refrigerant, take into account the slight change in the composition
of the gas and liquid phases. And always charge from the liquid phase where
refrigerant composition is stable.

2.2. Special tools for R410A

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 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
Pressure is high and cannot be measured with a conventional
gauge. To prevent erroneous mixing of other refrigerants, the
diameter of each port has been changed.
Gauge manifold
It is recommended the gauge with seals –0.1 to 5.3 MPa
(-1 to 53 bar) for high pressure. –0.1 to 3.8 MPa (-1 to 38 bar)
for low pressure.
To increase pressure resistance, the hose material and base
Charge hose
size were changed.
A conventional vacuum pump can be used by installing a
Vacuum pump
vacuum pump adapter.
Gas leakage
Special gas leakage detector for HFC refrigerant R410A.
detector
Copper pipes
It is necessary to use seamless copper pipes and it is desirable that the amount of
residual oil is less than 40 mg/10 m. Do not use copper pipes having a collapsed,
deformed or discolored portion (especially on the interior surface). Otherwise, the
expansion valve or capillary tube may become blocked with contaminants.
As an air conditioner using R410A incurs pressure higher than when using conventional
refrigerant, it is necessary to choose adequate materials.
Thicknesses of copper pipes used with R410A are as shown in the table. Never use
copper pipes thinner than that in the table even when it is available on the market.
Thicknesses of Annealed Copper Pipes (R410A)
Pipe outside diameter [mm (in.)]
9.52 (3/8)
15.88 (5/8)
WARNING
WARNING
Contents of change
Thickness [mm]
0.80
1.00

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 falling, water leakage, electric shock, or fire.
• The following installation parts are supplied. 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
Installation Manual
Drain pipe
Drain cap
Insulation (seal)

3. INSTALLATION WORK

3.1. Selecting an installation location

Securely install the outdoor unit at a location that can withstand the weight of the unit.
Otherwise, the outdoor unit may fall and cause injury.
Be sure to install the outdoor unit as prescribed, so that it can withstand earthquakes
and typhoons or other strong winds. Improper installation can cause the unit to topple
or fall, or other accidents.
Do not install the outdoor unit near the edge of a balcony. Otherwise, children may
climb onto the outdoor unit and fall off of the balcony.
Do not install the outdoor 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 filled 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 containing equipment that generates electromagnetic interference. It will
cause the control system to malfunction, preventing the unit from operating
normally.
• Area that can cause combustible gas to leak, contains suspended carbon fibers or
flammable dust, or volatile inflammables such as paint thinner or gasoline. If gas
leaks and settles around the unit, it can cause a fire.
• Area that has heat sources, vapors, or the risk of the leakage of flammable gas in
the vicinity.
• Area where small animals may live. It may cause failure, smoke or fire if small
animals enter and touch internal electrical parts.
• Area where animals may urinate on the unit or ammonia may be generated.
Do not tilt the outdoor unit more than 3 degrees.
Install the outdoor unit in a well-ventilated location away from rain or direct sunlight.
Q'ty Description
This manual
1
For outdoor unit drain piping work
1 (May not be supplied, depending on
the model.)
2
For filling in a gap at the entrance of
connection cords
1
WARNING
CAUTION
En-2