Audi Q5 2008 - Page 20

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Note
Some service units are charging systems not requiring a permit.
When working with such equipment, the refrigerant is not trans‐
ferred to mobile compressed-gas vessels, but rather into a per‐
manently installed charging cylinder with visible level gauge and
float switch.
Recommendation
It is advisable to use a portable cylinder with visible level gauge
and pressure relief valve for surplus refrigerant for internal use.
Attention must be paid to TRG 402 (technical regulations for com‐
pressed gases) when transferring compressed gases to other
compressed-gas vessels.
1.2.3 Extraction System Group Classifica‐
tions
WARNING
When performing work on refrigerant circuit or when handling
refrigerant observe all generally applicable safety precautions
and pressure vessel regulations.
Note
♦ The service and recycling units used in motor vehicle work‐
shops are extraction and charging systems not requiring a
permit (Group 3) but which are only to be operated by qualified
personnel. Instructions for unit operation and maintenance
can be found in the relevant manufacturer's documentation.
♦ Extraction and charging systems of groups 1 and 2 are not
used in motor vehicle workshops.
Extraction and Charging Systems Of Group 3
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 pressure
vessel regulations, compressed-gas vessels are classified as
pressure vessels in this case.
The charging systems require:
– No permit
– No expert testing as the gas is transferred to compressed-gas
vessels which are classed as being pressure vessels. (Sys‐
tems used for transfer from these pressure vessels to com‐
pressed-gas vessels for supplying to third parties do however
require a permit and are subject to mandatory testing).
Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ...
Refrigerant R134a Servicing - Edition 01.2011
16 Rep. Gr.00 - General, Technical Data