Volkswagen Polo Service & Repair Manual: Extraction System Group Classifications
| At this time, A/C service units for extracting, cleaning and
filling refrigerant for motor vehicle A/C systems are available
from various manufacturers. |
| Mobile extraction and charging systems for filling
compressed-gas vessels permanently connected to the system. |
| The refrigerant or refrigerant/oil mixture is transferred to
compressed 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 expert testing as the gas is transferred to
compressed-gas vessels which are classed as being pressure
vessels. (Systems used for transfer from these pressure vessels
to compressed-gas vessels for supplying to third parties do
require a permit and are subject to mandatory testing). |
 Note
| The A/C service and recycling units used in motor vehicle
workshops 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. |
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At this time, A/C service units for extracting, cleaning and
filling refrigerant for motor vehicle A/C systems are available
from various manufacturers.
...
Other materials:
Run-Flat System PAX, Examining Support Ring
As with the tire, the supporting ring is generally not
replaced after driving with flat tire.
Replace the support ring if the following damages have
occurred:
Blowouts or mis ...
Expansion Valve
Caution
Non-approved tools or materials such as leak sealing
additives can cause damage or malfunctions in the
system.
Only use tools and materials approved by the
manufactu ...
Tires, Rolling Noises, General Information
Rolling noise perceived by the human ear is caused by
vibrations transmitted from the noise source to the ear via the
air.
Here we are interested in noises created by certain
characteristics of the tires as well as the effects of rolling ...
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Charging Systems not Requiring a Permit