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4 Selection of installation place
Upon customer’s approval, install the air conditioner in a place which satisfies the following conditions:
• Place where it can be installed horizontally.
• Place which can reserve a sufficient service space for safe maintenance or checks.
• Place where there is no problem even if the drained water overflows.
Avoid the following places:
• Salty places (seaside area) or places with much gas sulfide (hot spring area) (If selecting such a place, special
maintenance is required.)
• Places where oil (including machine oil), steam, oil smoke or corrosive gas is generated.
• Places where iron or other metal dust is present. If iron or other metal dust adheres to or collects on the interior
of the air conditioner, it may spontaneously combust and start a fire.
• Places where an organic solvent is used.
• Chemical plants with a cooling system using liquid carbon dioxide.
• Places where a device generating high frequency (inverter, non-utility generator, medical apparatus, or
communication equipment) is set. (Malfunction or abnormal control of the air conditioner, or interference to
devices listed above may occur.)
• Places where discharged air from the outdoor unit blows against the windows of a neighbour’s house.
• Places unable to bear the weight of the unit.
• Places with poor ventilation.
• The cooling performance may decline considerably when total operating capacity of cooling indoor units is less
than 4HP while ambient temperature is below 0°C.
3 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 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 mixing of refrigerant or refrigerating oil, the size of the charge port of the main unit or connecting
section of the installation tool differs to that of an air conditioner for the former refrigerant.
Accordingly, exclusive tools are required for the new 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
It is necessary to prepare the tools and parts for installation as described below. The tools and parts which will be
newly prepared in the following items should be restricted to exclusive use.
Explanation of symbols
: Newly prepared (It is necessary to use it exclusively with R410A, separately from those for R22 or R407C.)
: Former tool is available.
Used tools Usage Proper use of tools/parts
Gauge manifold
Vacuuming, charging refrigerant
and operation check
Exclusive to R410A
Charging hose
Exclusive to R410A
Charging cylinder Charging refrigerant Unusable (Use the Refrigerant charging balance.)
Gas leak detector Checking gas leak
Exclusive to R410A
Vacuum pump Vacuum drying
Usable if a counter-flow preventive adapter is
attached
Vacuum pump with counterflow Vacuum drying
R22 (Existing article)
Flare tool Flare processing of pipes Usable by adjusting size
Bender Bending processing of pipes
R22 (Existing article)
Refrigerant recovery device Recovering refrigerant
Exclusive to R410A
Torque wrench Tightening flare nut
Exclusive to Ø12.7mm and Ø15.9mm
Pipe cutter Cutting pipes
R22 (Existing article)
Refrigerant canister Charging refrigerant
Exclusive to R410A
Enter the refrigerate name for identification
Brazing machine/Nitrogen gas
cylinder
Brazing of pipes
R22 (Existing article)
Refrigerant charging balance Charging refrigerant
R22 (Existing article)
1 7 -EN
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