Audi A8 1994 - Charging Refrigerant Circuit; Connecting for Measuring and Testing, Two Service Connections

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Commercially available service stations can be classified in 2
groups:
♦ A. Service stations which clean extracted refrigerant for use
(so-called extraction and recycling stations), for example,
V.A.G 1885 (currently available service stations refer to Spe‐
cial Tools and Equipment Catalog).
♦ B. Service stations which transfer extracted refrigerant to re‐
cycling containers (for large-scale recycling). These are refer‐
red to as extraction systems.
2.4.3 Charging Refrigerant Circuit
Note
The entire refrigerant charge can be added to either on the high
or low pressure side. Refer to
⇒ “3.4 Refrigerant Oil Capacities“, page 119 .
• The work procedure is always to be performed as described
in the operating instructions for the A/C service station.
• Before pouring in refrigerant, correct the quantity of refrigerant
oil, refer to ⇒ “3.4 Refrigerant Oil Capacities“, page 119 .
• Make sure the A/C service station is standing at the same level
as the vehicle (maximum difference: 50 cm) when charging
the refrigerant circuit. If a difference in height is large enough,
a difference between the amount of refrigerant displayed on
the service station and amount actually filled in the circuit will
result (depending on the version of the A/C service station ).
The ability of the A/C Service Station to perform an exact filling
can change.
– Switch off the ignition.
– Discharging refrigerant circuit using service station. Refer to
⇒ “2.4.11 Evacuating Refrigerant Circuit“, page 89 .
– Screw out handwheel at quick-release coupling adapter (to
close it).
– Allow refrigerant to flow into charging hose.
– Check charging cylinder
– Screw in handwheel at quick-release coupling adapter (to
open it) and charge with the specified quantity of refrigerant.
– Switch off service station.
2.4.4 Connecting for Measuring and Testing,
Two Service Connections
Connecting on vehicles with connections on low- and high pres‐
sure side of refrigerant circuit
– Switch off the ignition.
– Connect service station to power supply.
– Connect quick-release coupling adapter to charging hoses of
service station (handwheels not screwed in/hand shut-off
valve not open).
– Switch on service station and evacuate charging hoses (only
necessary if there is air in charging hoses).
– Switch off service station.
– Remove caps from service connections (with valve).
Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ...
Refrigerant R134a Servicing - Edition 01.2011
2. Description and Operation 83