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Note
The dependency between pressure and temperature described
on the pressure gauge no longer applies when there is no liquid
and the pressure is created by gas alone.
2.10 Air conditioner service and recycling
equipment
At present, various manufacturers offer air conditioner service
devices on the market for evacuating, cleaning and charging re‐
frigerant in vehicle air conditioning systems.
2.10.1 Classification of extraction systems in
groups
Group 3:
Portable extraction and charging devices linking the air condi‐
tioning system to a fixed compressed gas container.
The fixed compressed gas container is charged with refrigerant
or refrigerant/oil mixture. The portable extraction and charging
device is then permanently attached to the pressure vessel. In
accordance with § 3 section 5 no. 3 of the Regulations for Pres‐
sure Tanks, in this case the terms "compressed gas container"
and "pressure tank" are equivalent.
Charging devices require:
♦ no permit
♦ no checking by an authorised official, since the gas is held in
the compressed gas container, which is equivalent to a pres‐
sure tank. (Devices for filling refrigerant from these pressure
tanks into compressed gas containers that are intended for
third-party use, in turn, require licensing and they are subject
to checking by an authorised official.)
Note
The air conditioner service and recycling devices used in vehicle
workshops are Group 3 extraction and charging devices which do
not require a permit, but which can be operated only by skilled
staff. Refer to the manufacturer's documentation for instructions
on operating and maintaining these devices.
2.10.2 Charging devices that do not require a
permit
Charging devices that do not require a permit are mobile charging
devices into which pressurised gases are charged into com‐
pressed gas containers for exclusive use of one company.
Note:
Some air conditioner service devices are charging devices that
do not require a permit. When these devices are used, the refrig‐
erant is charged not into locally mobile compressed gas contain‐
ers, but into a permanently installed charging cylinder with a
visible contents gauge and float switch.
Amarok 2011 ➤ , Beetle 2012 ➤ , Bora 1999 ➤ , CC 2010 ➤ , CC 2012 ➤ , ...
Air conditioning system with refrigerant R134a - Edition 10.2014
2. General information on refrigerant circuit 37
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