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When installing and relocating the air conditioner, do not mix gases other than the
specified refrigerant (R410A) to enter the refrigerant cycle.
If air or other gas enters the refrigerant cycle, the pressure inside the cycle will rise to an
abnormally high value and cause rupture, injury, etc.
For the air conditioner to work appropriately, install it as written in this manual.
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.
Do not use an extension cable.
Do not purge the air with refrigerants but use a vacuum pump to vacuum the installation.
There is no 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 3-way
valve open. This may cause abnormal pressure in the refrigeration cycle that leads to
rupture and even injury.
Dispose of the packing materials safely. Tear and dispose of the plastic packing bags
so that children cannot play with them. There is the danger of suffocation if children play
with the original plastic bags.
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.
Indicates a potentially hazardous situation that may result in minor
CAUTION
or moderate injury or damage to property.
This unit must be installed by qualified personnel with a capacity certification of handling
refrigerant fluids. Refer to regulation and laws in use on installation place.
Install the unit by following local codes and regulations in force in the place of
installation, and the installation instructions of the manufacturer.
This unit is part of a set constituting an air conditioner. The unit must not be installed
alone or be installed with device not authorized 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 3mm for this unit.
To protect the persons, earth (ground) the unit correctly, and use the power cable
combined with an Earth Leakage Circuit Breaker (ELCB).
The units are not explosion proof, and therefore should not be installed in explosive
atmosphere.
This unit contains no user-serviceable parts. Always consult experienced service
technician for repairing.
When moving or relocating the air conditioner, consult experienced service technicians
for disconnection and installation of the unit.
Children should be monitored to ensure they do not play with the device.
Do not touch the aluminum fins of heat exchanger built-in the indoor or outdoor unit to
avoid personal injury when you install or maintain the unit.
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
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 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 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:
WARNING
• 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
1/2-20 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
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 refrigerant
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
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 –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.
Charging 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.
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 residual
oil is less than 40 mg/33ft (10m). 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 [in. (mm)]
1/4 (6.35)
3/8 (9.52)
1/2 (12.70)
5/8 (15.88)
3/4 (19.05)
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 falling, water leakage, electric shock, or fire.
Following installation parts are supplied. Use them as required.
Keep this manual in a safe place, and do not discard any other accessories until the
installation work has been completed.
Name and shape
Installation
manual
Cable tie with clip
Conduit plate
WARNING
WARNING
Changes
Thickness [in. (mm)]
0.032 (0.80)
0.032 (0.80)
0.032 (0.80)
0.039 (1.00)
0.047 (1.20)
WARNING
Q'ty
Description
This manual
1
For binding power supply cable and
connection cable
1
To fix Conduit tube
1
En-3
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