EN-8
EN-7
4
2
INSTALLATION OF NEW REFRIGERANT
AIR CONDITIONER
This air conditioner adopts the new HFC refrigerant (R410A) which does not deplete the ozone layer.
• R410A refrigerant is apt to be affected by impurity such as water, oxidizing membrane, or oils because the
pressure of R410A refrigerant is higher than that of the former refrigerant by approx. 1.6 times.
Accompanied with adoption of the new refrigerant, refrigerating oil has been also changed.
Therefore pay attention so that water, dust, former refrigerant, or refrigerating oil does not enter into the
refrigerating cycle of the new refrigerant air conditioner during installation work.
• To prevent from mixing of refrigerant or refrigerating oil, the size of charge port of the main unit or connecting
section of installation tool differs from that of the air conditioner for the former refrigerant.
Accordingly the exclusive tools are required for the new refrigerant (R410A) as shown below.
• For connecting pipes, use the new and clean piping materials so that water or dust does not enter.
Required tools and cautions on handling
It is necessary to prepare the tools and parts as described below for the installation work.
The tools and parts which will be newly prepared in the following items should be restricted to the exclusive
use.
Explanation of symbols
: Newly prepared (It is necessary to use it properly exclusive to R410A separated from those for R22 or
R407C.)
: Former tool is available.
Used tools
Usage
Proper use of tools/parts
Gauge manifold
Vacuuming or charging of
refrigerant and operation check
Newly prepared, Exclusive to R410A
Charging hose
Newly prepared, Exclusive to R410A
Gas leak detector
Checks gas leak
Newly prepared
Vacuum pump
Vacuum drying
Usable if a counter-
fl
ow preventive adapter is attached
Vacuum pump with counter-
fl
ow
preventive adapter
Vacuum drying
: R22 (Existing article)
Bender
Bending processing of pipes
: R22 (Existing article)
Refrigerant recovery device
Recovers refrigerant
Exclusive to R410A
Pipe cutter
Cuts pipes
: R22 (Existing article)
Refrigerant cylinder
Charges refrigerant
Exclusive to R410A
ID : Refrigerant name entered
Brazing machine/
Nitrogen gas cylinder
Brazing of pipes
: R22 (Existing article)
Refrigerant charging balance
Charges refrigerant
: R22 (Existing article)
Refrigerant piping
• Piping material used for the conventional refrigerant cannot be used.
• Use copper pipe with 0.8mm or more thickness for Ø6.4, Ø9.5, Ø12.7mm.
Use copper pipe with 1.0mm or more thickness for Ø15.9mm, Ø19.1mm, Ø22.2mm or more.
• Use clean and new pipes for the refrigerant pipes and perform piping work so that water or dust does not
contaminate the refrigerant.
3
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
fi
re 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.
Flow selector unit
Indoor unit
10m or more
When installing the unit at the above places, separate the unit from the indoor unit (more than 10 m) and install
the unit at a place so that sound does not transmit into the room such as in the corridor ceiling.
And take sound proof measure, such as covering around the Flow Selector unit with the sound proo
fi
ng
materials.
Upon customer’s approval, install the air conditioner at a place where satis
fi
es 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
fl
ows.
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 sul
fi
de (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 in
fl
uence may generate by malfunction of the air conditioner, control
trouble, or noise for such equipment.)
