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Airwell Multisplit YAZE DUO DCI Manual

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CAUTION
New Refrigerant Air Conditioner Installation
THIS AIR CONDITIONER ADOPTS THE NEW HFC REFRIGERANT (R410A) WHICH DOES NOT DESTROY OZONE LAYER.
Changes in the product and components
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.
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)
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.
Connected to conventional vacuum pump. It is necessary to use
an adapter to prevent vacuum pump oil from flowing back into
the charge hose. The charge hose connecting part has two ports
-- one for conventional refrigerant (7/16 UNF 20 threads per inch)
and one for R410A. If the vacuum pump oil (mineral) mixes with
R410A a sludge may occur and damage the equipment.
Exclusive for HFC refrigerant.
New tools for R410A Applicable to R22 model Changes
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
Vacuum pump adapter
Gas leakage detector
New tools for R410A
INSTALLATION/SERVICE TOOLS (ONLY FOR R410A PRODUCT)
Incidentally, the "refrigerant cylinder" comes with the refrigerant designation (R410A) and protector coating in the
U.S's ARI specified rose color (ARI color code: PMS 507).
Also, the "charge port and packing for refrigerant cylinder" requires 1/2 UNF 20 threads per inch corresponding
to the charge hose's port size.
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