Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A1 Sportback 2 ...
Air conditioner with refrigerant R134a - Edition 11.2018
Note
The relationship between pressure and temperature no longer
applies if no liquid is present and f the pressure is only built up by
gas.
3.10
Air conditioner service and recycling
units
Air conditioner service units for the extraction, cleaning and trans‐
fer of refrigerant for motor vehicle air conditioning systems are
currently available from various manufacturers.
Only certain air conditioner service stations (with appropriate ad‐
ditional equipment and various adapters if applicable) can be
used for cleaning the refrigerant circuit (flushing it with refrigerant
R134a) ⇒ page 100 .
⇒ “3.10.1 Classification of extraction systems”, page 71
⇒ “3.10.2 Charging systems that do not require a permit”,
page 72
3.10.1
Classification of extraction systems
WARNING
When working on the refrigerant circuit and handling refriger‐
ant, observe the generally valid safety precautions and pres‐
sure vessel regulations.
Note
♦ The air conditioner service and recycling units used in motor
vehicle workshops are extraction and charging systems that
do not require a permit (Group “3”) but which should only be
operated by qualified personnel. Instructions for the operation
and service of the devices may be found in the respective
manufacturer's documentation.
♦ Extraction and charging systems of groups “1” and “2” are not
used in motor vehicle workshops.
Group “3” extraction and charging systems:
Mobile extraction and charging systems for filling compressed-
gas vessels permanently connected to the system
The refrigerant or refrigerant/oil mixture is transferred to com‐
pressed-gas vessels which are permanently connected to the
mobile systems. In accordance with § 3 Para. 5 No. 3 of the Ger‐
man pressure vessel regulations (different regulations may apply
in other countries), compressed-gas vessels are classified as
pressure vessels in this case.
The charging systems:
– Do not require a permit.
– Do not require expert testing, as the gas is transferred to com‐
pressed-gas vessels which are classed as being pressure
vessels (On the other hand, a permit is required for the system
to fill a pressurised gas container for transfer to another party
from this pressurised container, and the permit requires an
examination.)
3. General information on refrigerant circuit
71
English 
