Volkswagen Touran Service Manual: Safety Precautions
General Safety Precautions
As per VBG 20, German industrial liability insurance
association. |
Follow the instructions for the workplace. They should be
displayed in the workplace. |
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Product Characteristics
Refrigerants used in motor vehicle air conditioning systems
belong to the new generation of refrigerants based on
chlorine-free, partially fluorinated hydrocarbons (H-FKW,
R134a). |
With regard to their physical properties, these are
refrigerants which have been liquefied under pressure. They are
subject to the regulations governing pressure vessels and use is
only to be made of approved and appropriately marked containers. |
Compliance with specific conditions is required to ensure
safe and proper use. |
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Handling Refrigerant
WARNING
There is a danger of ice-up. |
The refrigerant can then escape as a fluid or vapor. |
Do not open containers which store refrigerant. |
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If refrigerant vessels are opened, the contents may escape
in liquid or vapor form. This process is intensified the higher
the pressure in the vessel. |
The pressure level is governed by two factors: |
The type of refrigerant in the vessel. "The lower the
boiling point, the higher the pressure." |
The temperature level. "The higher the temperature, the
higher the pressure." |
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Protective Eyewear
Put on protective goggles. They prevent refrigerant getting into the eyes, as
this could cause severe injury from exposure to cold.
Protective Gloves and Clothing
Greases and oils dissolve readily in refrigerants. They
would therefore destroy the protective layer of grease if
allowed to come into contact with the skin. Degreased skin is
however sensitive to the cold and germs. |
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Fluid Refrigerant and Skin Precaution
The refrigerant draws heat for evaporation from the
surrounding area. Even if this is the skin. This may cause
extremely low temperatures. Local frost bite may result (boiling
point of R134a: -26.5 C (-15.7 F) at ambient pressure). |
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Do Not Breath In Refrigerant Vapor
Note
If highly concentrated refrigerant vapor escapes, it mixes
with the surrounding air and displaces the oxygen necessary for
breathing. |
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Smoking Hazard
A burning cigarette can cause refrigerant to decompose. The
resultant substances are toxic and must not be inhaled. |
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Welding and Soldering on Refrigeration Systems
Before performing welding or soldering work on vehicles near
the air conditioning system components, extract the refrigerant
and remove the residue by flushing with compressed air and
nitrogen. |
The products of refrigerant decomposition due to the effect
of heat are not only toxic, but may also have a highly corrosive
effect on pipes and system components. They mainly take the form
of hydrogen fluoride. |
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Pungent Odor
A pungent odor indicates that the products of decomposition mentioned above
have already formed. Avoid inhaling these substances under all circumstances, as
otherwise the respiratory system, lungs and other organs could be damaged.
First Aid
Following contact with eyes or mucous membranes, immediately
rinse with copious amounts of running water and consult an eye
specialist. |
Following contact with the skin, immediately remove affected
clothing and rinse skin with copious amounts of water. |
Following inhalation of highly concentrated refrigerant
vapors, immediately take the affected person into the open air.
Call a doctor. Administer oxygen in the event of breathing
difficulties. If the affected person has difficulty breathing or
cannot breathe, tip head back and perform mouth to mouth
respiration. |
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Handling Pressure Vessels
Secure vessels to prevent them falling over! |
Secure upright cylinders to stop them falling over and
cylinders lying flat to stop them rolling away. |
If dropped, the vessels could be so severely deformed that
they rupture. The refrigerant evaporates immediately, liberating
considerable force. Flying fragments of cylinders can cause
severe injuries. |
Valves may break off if cylinders are not properly
transported. To protect the valves, cylinders are only to be
transported with protective cap screwed on. |
Never store in the vicinity of radiators. |
High temperatures may occur next to radiators. High
temperatures are also accompanied by high pressures and the
maximum permissible vessel pressure may be exceeded. |
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Not Warming Above 50 C (122 F)
To avoid possible risk, pressure vessel regulations specify
that vessels are not to be heated to in excess of 50 C (122
F). |
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Heating Warning
Do not heat with a naked flame under any circumstances.
Localized overheating can cause structural changes in the vessel
material, which then reduce its ability to withstand pressure.
There is also a danger of refrigerant decomposition due to
localized overheating. |
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Empty Containers
Empty refrigerant vessels must always be sealed to prevent
the ingress of moisture. Moisture causes steel vessels to
corrode. This weakens the vessel walls. In addition, rust
particles entering into refrigeration systems from vessels will
cause malfunctioning. |
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Extraction and Charging System Safety Regulations
Make sure the shut-off valves are closed before connecting
the charging system to the air conditioning system. |
Make sure the process is finished before disconnecting the
charging system from the A/C system. This prevents any
refrigerant from escaping into the atmosphere. |
Once the purified refrigerant from the charging system has
been transferred to an external compressed-gas cylinder, close
the hand shut-off valves at the cylinder and charging system. |
Do not expose charging system to moisture or use it in a wet
environment. |
Disconnect from power supply before performing service work
on the charging system. |
Never use an extension cable on account of the fire hazard.
If the use of an extension cable is unavoidable, the minimum
cross-section should be 2.5 mm2.
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In case of fire, remove the external cylinder. |
Entrained oil from the air conditioning system drawn by the
suction unit into the measurement vessel supplied is
subsequently to be transferred to a sealed container as it
contains a small quantity of refrigerant. It must not be
released into the environment. |
Following shutdown, A/C service station is to be secured to
stop it rolling away. |
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The temperature in the passenger compartment depends on the
amount of heat radiated through the windows and conducted by the
metal parts of the body. In hot weather i ...
A/C Service Station -VAS6007A- (and further or current A/C
Service Station)
Refer to the Workshop Equipment Catalog.
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