Toshiba ССD Manual De Instrucciones página 5

3. INSTALLATION/SERVICE TOOLS (Only for R410A product)
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 of refrigerant R22. Accompanied with the adoption of the new refrigerant, the
refrigeration machine oil has also been changed. Therefore, during installation work, be sure that
water, dust, former refrigerant, or refrigeration machine oil does not enter into the new type
refrigerant R410A air conditioner circuit.
To prevent mixing of refrigerant or refrigerating machine oil, the sizes of connecting sections of
charging port on main unit and installation tools are different from those used for 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. Moreover, do not use the existing piping because
there are some problems with pressure fittings and possible impurities in existing piping.
Changes in the product and components
In air conditioners using R410A, in order to prevent any other refrigerant from being accidentally
charged, the service port diameter size of the outdoor unit control valve (3 way valve) has been
changed. (1/2 UNF 20 threads per inch)
In order to increase the pressure resisting strength of the refrigerant piping, flare processing
diameter and opposing flare nuts sizes have been changed. (for copper pipes with nominal
dimensions 1/2 and 5/8)
New tools for R410A
New tools for
Applicable to R22 model
R410A
Gauge manifold
Charge hose
Electronic balance
for refrigerant
charging
Torque wrench
(nominal dia. 1/2,
5/8)
Flare tool
(clutch type)
Gauge for
projection
adjustment
Changes
As the working pressure is high, it is impossible to
measure the working pressure using conventional
gauges. In order to prevent any other refrigerant from
being charged, the port diameters have been changed.
In order to increase pressure resisting strength, hose
materials and port sizes have been changed (to 1/2
UNF 20 threads per inch). When purchasing a charge
hose, be sure to confirm the port size.
As working pressure is high and gasification speed is
fast, it is difficult to read the indicated value by means
of charging cylinder, as air bubbles occur.
The size of opposing flare nuts have been increased.
Incidentally, a common wrench is used for nominal
diameters 1/4 and 3/8.
By increasing the clamp bar's receiving hole size,
strength of spring in the tool has been improved.
Used when flare is made by using conventional flare
tool.
4
Indoor unit cassette type