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This air conditioner adopts the new refrigerant HFC
(R-410A) which does not damage the ozone layer.
The working pressure of the new refrigerant R-410A is
1.6 times higher than conventional refrigerant (R-22).
The refrigerating oil is also changed in accordance
with change of refrigerant, so be careful that water,
dust, and existing refrigerant or refrigerating oil are not
entered in the refrigerant cycle of the air conditioner
using the new refrigerant during installation work or
servicing time.
The next section describes the precautions for air
conditioner using the new refrigerant. Conforming to
contents of the next section together with the general
cautions included in this manual, perform the correct
and safe work.
2-1. Safety During Installation/Servicing
As R-410A's pressure is about 1.6 times higher than
that of R-22, improper installation/servicing may cause
a serious trouble. By using tools and materials exclu-
sive for R-410A, it is necessary to carry out installation/
servicing safely while taking the following precautions
into consideration.
(1) Never use refrigerant other than R-410A in an air
conditioner which is designed to operate with
R-410A.
If other refrigerant than R-410A is mixed, pressure
in the refrigeration cycle becomes abnormally
high, and it may cause personal injury, etc. by a
rupture.
(2) Confirm the used refrigerant name, and use tools
and materials exclusive for the refrigerant R-410A.
The refrigerant name R-410A is indicated on the
visible place of the outdoor unit of the air condi-
tioner using R-410A as refrigerant. To prevent
mischarging, the diameter of the service port
differs from that of R-22
(3) If a refrigeration gas leakage occurs during
installation/servicing, be sure to ventilate fully.
If the refrigerant gas comes into contact with fire,
a poisonous gas may occur.
(4) When installing or removing an air conditioner,
do not allow air or moisture to remain in the
refrigeration cycle. Otherwise, pressure in the
refrigeration cycle may become abnormally high
so that a rupture of personal injury may be
caused.
2. REFRIGERANT R-410A
(5) After completion of installation work, check to
(6) When an air conditioning system charged with a
(7) Be sure to carry out installation or removal
(8) Unauthorized modifications to the air conditioner
2-2. Refrigerant Piping Installation
2-2-1. Piping materials and joints used
For the refrigerant piping installation, copper pipes and
joints are mainly used. Copper pipes and joints suit-
able for the refrigerant must be chosen and installed.
Furthermore, it is necessary to use clean copper pipes
and joints whose interior surfaces are less affected by
contaminants.
(1) Copper Pipes
– 5 –
FILE NO. SVM-02007
make sure that there is no refrigeration gas
leakage.
If the refrigerant gas leaks into the room, coming
into contact with fire in the fan-driven heater,
space heater, etc., a poisonous gas may occur.
large volume of refrigerant is installed in a small
room, it is necessary to exercise care so that,
even when refrigerant leaks, its concentration
does not exceed the marginal level.
If the refrigerant gas leakage occurs and its
concentration exceeds the marginal level, an
oxygen starvation accident may result.
according to the installation manual.
Improper installation may cause refrigeration
trouble, water leakage, electric shock, fire, etc.
may be dangerous. If a breakdown occurs please
call a qualified air conditioner technician or
electrician.
Improper repair's may result in water leakage,
electric shock and fire, etc.
It is necessary to use seamless copper pipes
which are made of either copper or copper alloy
and it is desirable that the amount of residual oil is
less than 40 mg/10 m. Do not use copper pipes
having a collapsed, deformed or discolored
portion (especially on the interior surface).
Otherwise, the expansion valve or capillary tube
may become blocked with contaminants.
As an air conditioner using R-410A incurs pres-
sure higher than when using R-22, it is necessary
to choose adequate materials.
Thicknesses of copper pipes used with R-410A
are as shown in Table 2-2-1. Never use copper
pipes thinner than 0.8 mm even when it is avail-
able on the market.
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