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Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017
♦ When disposing of refrigerant oil that is no longer usable, the
legal requirements must be observed
⇒ “2 Legal texts and regulations”, page 5 and ⇒ VW / Audi
ServiceNet .
♦ To protect the environment, no refrigerant should be released
into the atmosphere
⇒ “2 Legal texts and regulations”, page 5 .
♦ If, during the gas analysis, it is found that the R1234yf refrig‐
erant is contaminated with a different gas, it must be extracted
from the refrigerant circuit and returned to your gas supplier to
be analysed, processed or disposed of as gas of unknown
composition in accordance with the legal requirements ⇒ VW /
Audi ServiceNet and
⇒ “2.13 Filling contaminated refrigerant in a recycling cylinder
for analysis, processing or disposal”, page 161 .
Note
Return contaminated R1234yf refrigerant to lykour refrigerant sup‐
plier for analysis. If, owing to refrigerant circuit damage that has
already occurred or is expected, it is necessary for you to know
exactly which impurities the refrigerant is contaminated with, sub‐
mit an application by requesting analysis results
⇒ “2.4 Emptying refrigerant circuit”, page 137 .
6.3
Product characteristics
R1234yf refrigerant used in motor vehicle air conditioning sys‐
tems belongs to the new generation of refrigerants based on
chlorine-free, partially fluorinated hydrocarbons.
With regard to their physical properties, these are refrigerants
which have been liquefied under pressure. These 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 ⇒ “1 Safety information”, page 1 .
6.4
Function and role of air conditioning sys‐
tem
⇒ “6.4.1 Principle of operation”, page 26
⇒ “6.4.2 Comfort”, page 27
⇒ “6.4.3 Environmental aspects”, page 27
6.4.1
Principle of operation
♦ The temperature in the passenger compartment depends on
the amount of heat radiated through the windows and con‐
ducted by the metal parts of the body. In order to maintain
comfortable temperatures for the occupants on very warm
days, part of the prevailing heat must be pumped away.
♦ Since heat spreads towards cooler bodies, a unit that can cre‐
ate low temperatures is fitted in the vehicle interior. Within this,
refrigerant is continually evaporated. The heat required to do
this is extracted from the air flowing through the evaporator.
♦ The refrigerant carries the heat with it as it is pumped away by
the air conditioner compressor. The work performed by the air
conditioner compressor on the refrigerant increases its heat
content and its temperature. This is now substantially higher
than that of the surrounding air.
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Rep. gr.00 - Technical data
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