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Outdoor Unit
5
INSTALLATION OF NEW REFRIGERANT
AIR CONDITIONER
New Refrigerant Air Conditioner Installation
• THIS AIR CONDITIONER ADOPTS THE NEW HFC REFRIGERANT (R410A) WHICH DOES NOT DESTROY
OZONE LAYER.
R410A refrigerant is apt to be affected by impurities such as water, oxidizing membrane, and oils because the working
pressure of R410A refrigerant is approx. 1.6 times as that of refrigerant R22. Accompanied with the adoption of the new
refrigerant, the refrigerant oil has also been changed. Therefore, during installation work, be sure that water, dust,
former refrigerant, or refrigerant oil does not enter the new type refrigerant R410A air conditioner cycle.
To prevent mixing of refrigerant or refrigerant oil, the sizes of connecting sections of charging port on main unit and
installation tools are different from those of the conventional refrigerant units. Accordingly, special tools are required for
the new refrigerant (R410A) units. For connecting pipes, use new and clean piping materials with high pressure fittings
made for R410A only, so that water and/or dust does not enter.
Required Tools/Equipment and Precautions for Use
Prepare the tools and equipment listed in the following table before starting the installation work.
: R410A exclusive
: Generic
Tools/equipment
Manifold gauge*
Charging hose
Gas leak detector
Vacuum pump with backflow
prevention function
Flare tool
Bender
Refrigerant recovery equipment
Torque wrench
Pipe cutter
Brazing torch and nitrogen
cylinder
Refrigerant charging scales
4 mm hexagon wrench
7-EN
CAUTION
Use
Vacuuming/charging refrigerant
and operation check
Gas leak check
Vacuum drying
Flare machining of pipes
Bending pipes
Refrigerant recovery
Tightening flare nuts
Cutting pipes
Braze pipes
Charging refrigerant
Opening liquid valve
– 7 –
Installation Manual
Usable if dimensions are adjusted.
Ø1/4" (6.4 mm) and Ø1/2" (12.7 mm)
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