Electra Monoblock 7, Service Manual

Page: 187 / 187

CAUTION
INSTALLATION/SERVICE TOOLS (ONLY FOR R410A PRODUCT)
New Refrigerant Air Conditioner Installation
New tools for R410A
Applicable to R22 model
Gauge manifold
Vacuum pump adapter
Gas leakage detector
New tools for R410A
Changes
Electronic balance for
refrigerant charging
Exclusive for HFC refrigerant.
GB
F
D
I
E
T
PY
P
Charge hose
Incidentally, the "refrigerant cylinder" comes with the refrigerant designation (R410A) and protector coating in
the U.S's ARI specified rose color (ARI colr code:PMS507).
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.
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.
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.
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.