En-2
WARNING
To connect the indoor unit and outdoor unit, use air conditioner piping and cables
available locally as standard parts. This manual describes proper connections using
such installation set.
If the supply cord is damaged, it must be replaced by the manufacturer, its service
agent or similarly quali
fi
ed persons in order to avoid a hazard.
Do not modify power cable, use extension cable or branch wiring. Improper use may
cause electric shock or
fi
re by poor connection, insuf
fi
cient insulation or over current.
Do not purge the air with refrigerants but use a vacuum pump to vacuum the installa-
tion.
There is not extra refrigerant in the outdoor unit for air purging.
Using the same vacuum pump for different refrigerants may damage the vacuum
pump or the unit.
Use a clean gauge manifold, vacuum pump and charging hose for R410A exclusively.
During the pump down operation, make sure that the compressor is turned off before
you remove the refrigerant piping.
Do not remove the connection pipe while the compressor is in operation with 2 way or
3 way valve open. This may cause abnormal pressure in the refrigeration cycle that
leads to rupture and even injury.
This appliance is not intended for use by persons (including children) with reduced
physical, sensory or mental capabilities, or lack of experience and knowledge, unless
they have been given supervision or instruction concerning use of the appliance by a
person responsible for their safety. Children should be supervised to ensure that they
do not play with the appliance.
To avoid danger of suffocation, keep the plastic bag or thin
fi
lm used as the packaging
material away from young children.
When installing this system in high humidity locations, install using ground fault equip-
ment breakers (often referred to in other countries as an ELCB [earth leakage current
breaker]) to reduce the risk of leaking current which may result in electric shock or
potential
fi
re.
CAUTION
Read carefully all safety information written in this manual before you install or use the
air conditioner.
This unit must be installed by quali
fi
ed personnel with a capacity certi
fi
cate for han-
dling refrigerant
fl
uids. Refer to regulation and laws in use on installation place.
Installation work must be performed in accordance with national wiring standards by
authorized personnel only.
Install the product by following local codes and regulations in force at the place of
installation, and the instructions provided by the manufacturer.
Connect the indoor unit and outdoor unit with the air conditioner piping and cables
available standards parts. This installation manual describes the correct connections
using the installation set available from our standard parts.
Do not use an extension cable.
Do not turn on the power until all installation work is complete.
Do not purge the air with refrigerants but use a vacuum pump to vacuum the installa-
tion.
There is not extra refrigerant in the outdoor unit for air purging.
Use a vacuum pump for R410A exclusively.
Using the same vacuum pump for different refrigerants may damage the vacuum
pump or the unit.
Use a clean gauge manifold and charging hose for R410A exclusively.
After a long period of disuse in an environment 32 °F (0 °C) or lower, supply power to
the unit at least 12 hours before re-starting the unit.
This product is part of a set constituting an air conditioner. The product must not be
installed alone or be installed with non-authorized device by the manufacturer.
Always use a separate power supply line protected by a circuit breaker operating on
all wires with a distance between contact of 3 mm for this product.
To protect the persons, earth (ground) the product correctly, and use the power cable
combined with an Earth Leakage Circuit Breaker (ELCB).
This product is not explosion proof, and therefore should not be installed in explosive
atmosphere.
Do not touch the
fi
ns of the heat exchanger. Touching the heat exchanger
fi
ns could
result in damage to the
fi
ns or personal injury such as skin rupture.
This product contains no user-serviceable parts. Always consult experienced service
technicians for repairing.
When moving or relocating the air conditioner, consult experienced service technicians
for disconnection and reinstallation of the product.
Do not place any other electrical products or household belongings under indoor unit
or outdoor unit. Dripping condensation from the unit might get them wet, and may
cause damage or malfunction of your property.
2. ABOUT THIS PRODUCT
2. 1. Precautions for using R410A refrigerant
WARNING
The basic installation work procedures are the same as conventional refrigerant (R22)
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 refrig-
erant R410A model, always replace the conventional piping and
fl
are nuts with the
R410A piping and
fl
are 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
1/2-20 UNF.]
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 pinch-
ing, 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 side whose
composition is stable.
2. 2. Special tools for R410A refrigerant
Tool name
Contents of change
Gauge manifold
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.
It is recommended the gauge with seals 30 in. Hg to 769 psi
(-0.1 to 5.3 MPa) for high pressure. 30 in. Hg to 551 psi (-0.1 to
3.8 MPa) for low pressure.
Charge hose
To increase pressure resistance, the hose material and base
size were changed.
Vacuum pump
A conventional vacuum pump can be used by installing a
vacuum pump adapter.
Be sure that the pump oil does not back
fl
ow into the system.
Use one capable for vacuum suction of -100.7 kPa
(5 Ton, -755 mmHg).
Gas leakage
detector
Special gas leakage detector for HFC refrigerant R410A.
Copper pipes
It is necessary to use seamless copper pipes and it is desirable that the amount of re-
sidual 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 cop-
per pipes thinner than that in the table even when it is available on the market.
Thicknesses of Annealed Copper Pipes (R410A)
Pipe outside diameter [in. (mm)]
Thickness [in. (mm)]
1/4 (6.35)
0.032 (0.80)
3/8 (9.52)
0.032 (0.80)
1/2 (12.70)
0.032 (0.80)
5/8 (15.88)
0.039 (1.00)
3/4 (19.05)
0.047 (1.20)
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