Audi A8 1994 - Evacuating Refrigerant Circuit

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Caution
♦ When filling recycling containers (compressed-gas ves‐
sels), observe applicable regulations, technical rules and
laws.
♦ Recycling containers are never to be overfilled. Overfilled
containers do not have a sufficient gas cushion to accom‐
modate the liquid expansion caused by the effects of heat.
There is a danger of rupture.
♦ To ensure safety, make exclusive use of recycling con‐
tainers fitted with a safety valve.
♦ Recycling containers must be weighed on calibrated
scales during the filling process. The maximum permissi‐
ble capacity is 75% (charge factor 0.75) of the charge
weight indicated on the recycling container (the possibility
of refrigerant oil entering the recycling container along with
the refrigerant cannot be ruled out).
2.4.11 Evacuating Refrigerant Circuit
• The work procedure is always to be performed as described
in the operating instructions for the A/C service station.
• Quantity of refrigerant oil in circuit checked and if necessary
corrected. Refer to
⇒ “3.4 Refrigerant Oil Capacities“, page 119 .
• Check quantity of refrigerant in the service station.
The refrigerant circuit must be evacuated before it is filled with
refrigerant (vacuum). Moisture is also extracted from the circuit.
Leaks may be found when evacuating the refrigerant circuit.
Evacuating
Caution
♦ Do not start the engine during the evacuation process or
when there is a vacuum in the refrigerant circuit.
♦ The A/C compressor could be damaged if the engine is
started when there is a vacuum in the refrigerant circuit.
♦ Only start the engine when the refrigerant circuit is filled.
– Switch off the ignition.
– Connect service station to power supply.
– Connect charging hose of service station to vehicles refriger‐
ant circuit with quick-release coupling adapter (refer to vehi‐
cle-specific refrigerant circuit). Refer to ⇒ Heating, Ventilation
and Air Conditioning; Rep. Gr. 87 ; General Information (ve‐
hicle-specific repair manual).
– Only tighten the handwheel on the quick-release coupling
adapter just enough so the valves in the service connections
are securely open. Do not put too much pressure on the valve.
Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ...
Refrigerant R134a Servicing - Edition 01.2011
2. Description and Operation 89