Mazda CT-L1005, Руководство по обучению

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Fundamentals Basic Climate Control
Handling Refrigerant
•
Because R134a boils at –26°C, if a line is opened while there is refrigerant still in the
system, the refrigerant will boil by absorbing heat from the surrounding area. This means
that if your hand comes in contact with the refrigerant as it escapes, you will experience
acute frostbite (a strong burning sensation). To avoid this, insulated rubber gloves
should be worn. Normal cloth or leather gloves provide little protection, as the heat will
be absorbed through the material.
•
Protective safety glasses should be worn to protect against dirt being blown into the eyes
in the event that a high-pressure line is opened.
•
The A/C service equipment should be used in accordance with the manufacturers
instructions.
•
Keep in mind that R134a is heavier than air and will sink to the ground, that means that
working in a pit or other low lying area while servicing the A/C is not recommended,
because large amounts of released refrigerant could displace the air, and cause
suffocation.
•
While R134a is not flammable, it could develop into a toxic compound (hydrogen
fluoride) when it comes in contact with an open flame, electrical arcing, or a source of
extreme heat
Environmental Impact
•
R134a is an improvement on its predecessor R12, but it still is harmful to the
environment. R134a does not contribute to depletion of the ozone layer like R12 did, but
it still contributes to the greenhouse effect. When one gram of R134a is released to the
atmosphere, it has the same effect as 1.2 kg of CO
2
being released to the atmosphere.
For reference, 1 g of R12 has the same effect as 8.5 kg of CO
2
being released to the
atmosphere.
•
It should also be kept in mind that any R134a that is released into the atmosphere will,
on average, not break down for 14 years. While this is better than the 100 years it takes
R12 to break down, it is still not desirable.
02-12 Curriculum Training