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2
INSTALLATION OF R410A AIR CONDITIONER
This air conditioner adopts the HFC refrigerant (R410A) which does not deplete the ozone layer.
• R410A refrigerant is vulnerable to impurities such as water, oxidizing membranes, or oils because the pressure of
R410A refrigerant is higher than that of the former refrigerant by approximately 1.6 times.
As well as the adoption of the new refrigerant, the refrigerating oil has been also changed. Therefore, pay attention
so that water, dust, former refrigerant, or refrigerating oil does not enter the refrigerating cycle of the new refrigerant
air conditioner during installation.
• To prevent from mixing of refrigerant or refrigerating oil, the size of the charge port of the main unit or connecting
section of the installation tool differs from that of an air conditioner for the former refrigerant.
Accordingly, exclusive tools are required for the refrigerant (R410A) as shown below.
• For connecting pipes, use new and clean piping materials so that water or dust does not enter.
Required tools and cautions on handling
Prepare the tools and equipment listed in the following table before starting the installation work.
: R410A exclusive
: Generic
Tools/equipment
Manifold gauge*
Vacuuming/charging refrigerant
and operation check
Charging hose
Gas leak detector
Gas leak check
Vacuum pump with backflow
Vacuum drying
prevention function
Bender
Bending pipes
Refrigerant recovery equipment Refrigerant recovery
Pipe cutter
Cutting pipes
Brazing torch and nitrogen
Braze pipes
cylinder
Refrigerant charging scales
Charging refrigerant
Refrigerant piping
• Piping material used for the conventional refrigerant cannot be used.
• Use copper pipe with 0.031 in (0.8 mm) or more thickness for Ø1/4", Ø3/8", Ø1/2".
Use copper pipe with 0.039 in (1.0 mm) or more thickness for Ø5/8", Ø3/4", Ø7/8".
• Use clean and new pipes for the refrigerant pipes and perform piping work so that water or dust does not
contaminate the refrigerant.
EN-5
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SELECTION OF INSTALLATION PLACE
CAUTION
Do not install the air conditioner at place where combustible gas may leak.
If gas leaks and is collected at surrounding the unit, the production of fire may be caused.
Cautions for Installation at a Place with the Quiet Background Sound
As the Flow Selector unit incorporates the solenoid valve, the refrigerant sound or the operating sound of the
solenoid valve such as "Bushuu..." generates when exchanging between cooling and heating mode and during
defrost operation. Therefore, avoid installing the unit at a place with quiet background sound as follows.
(1) Rooms with quiet background sound such as bedroom, hospital, or room in a hotel.
(2) Rooms which have no ceiling and a fabric does not block the residence space from the Flow Selector
unit.
(3) Rooms which have opening port at the ceiling.
When installing the unit at the above places, separate the unit from the indoor unit (within 49 ft (15 m)) and install
the unit at a place so that sound does not transmit into the room such as in the corridor ceiling.
Upon customer's approval, install the air conditioner at a place where satisfies the following conditions.
• Place where it can be installed horizontally.
• Place which can reserve a service space for safe maintenance or check.
• Place where there is no problem even if the drained water flows.
Apply electric insulation between metal section of the building and metal section of the air conditioner in
conformance with the Local Regulation.
Avoid the following places.
• Salty place (seaside area) or place with much gas sulfide (hot spring area) (If selecting such a place, a special
maintenance is required.)
• Place where oil (including machine oil), steam, oil smoke or corrosive gas generates.
• Place where a device generating high frequency (inverter, non-utility generator, medical apparatus, or
communication equipment) is set. (A bad influence may generate by malfunction of the air conditioner, control error,
or noise for such equipment.)
EN-6
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