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Toshiba
–7–
Outdoor Unit
Installation Manual
5 INSTALLATION OF NEW REFRIGERANT
AIR CONDITIONER
CAUTION
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 Use
Manifold gauge*
Vacuuming/charging refrigerant
and operation check
Charging hose
Gas leak detector Gas leak check
Vacuum pump with backflow
prevention function
Vacuum drying
Flare tool Flare machining of pipes Usable if dimensions are adjusted.
Bender Bending pipes
Refrigerant recovery equipment Refrigerant recovery
Torque wrench Tightening flare nuts Ø1/4” (6.4 mm) and Ø1/2” (12.7 mm)
Pipe cutter Cutting pipes
Brazing torch and nitrogen
cylinder
Braze pipes
Refrigerant charging scales Charging refrigerant
4 mm hexagon wrench Opening liquid valve
7-EN
+00EH99865301_00Ta.book Page 7 Wednesday, November 25, 2009 11:05 AM