Справочник Пользователя для Toshiba RAV-SM566KRT-TR

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This air conditioner adopts the new refrigerant HFC

(R410A) which does not damage the ozone layer.
The working pressure of the new refrigerant R410A

is 1.6 times higher than conventional refrigerant

(R22).  The refrigerating oil is also changed in

accordance with change of refrigerant, so be careful

that water, dust, and existing refrigerant or refriger-

ating 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.

As R410A’s pressure is about 1.6 times higher than

that of R22, improper installation/servicing may

cause a serious trouble.  By using tools and materi-

als exclusive for R410A, it is necessary to carry out

installation/servicing safely while taking the follow-

ing precautions into consideration.
1. Never use refrigerant other than R410A in an air

conditioner which is designed to operate with

R410A. If other refrigerant than R410A 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

R410A. The refrigerant name R410A is indicated

on the visible place of the outdoor unit of the air

conditioner using R410A as refrigerant.
To prevent mischarging, the diameter of the

service port differs from that of R22.

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

or personal injury may be caused.

5. After completion of installation work, check to

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.

6. When an air conditioning system charged with a

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.

7. Be sure to carry out installation or removal

according to the installation manual.
Improper installation may cause refrigeration

trouble, water leakage, electric shock, fire, etc.

8. Unauthorized modifications to the air conditioner

may be dangerous.
If a breakdown occurs please call a qualified air

conditioner technician or electrician.
Improper repair may result in water leakage,

electric shock and fire, etc.

For the refrigerant piping installation, copper pipes

and joints are mainly used. Copper pipes and joints

suitable 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.

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 R410A incurs pres-

sure higher than when using R22, it is necessary

to choose adequate materials.
Thicknesses of copper pipes used with R410A

are as shown in Table 6-2-1.
Never use copper pipes thinner than 0.8 mm

even when it is available on the market.

FILE NO. SVM-12004