Refrigerant Circuit, Evacuating With A/C Service Station

Refrigerant Circuit, Evacuating With A/C Service Station

- 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.
- Quantity of refrigerant in A/C service station checked

The refrigerant circuit must be evacuated before it is filled with refrigerant. Moisture is also extracted from the circuit.

Evacuation:
- Switch off ignition.
- Connect A/C service station to power supply.
- Connect charging hoses of A/C service station to vehicle refrigerant circuit with quick-release coupling adapter (refer to vehicle specific refrigerant circuit).
- Screw in handwheel of quick-release coupling adapters until valves of service connections are definitely open (take care not to strain valve).

NOTE: If pressure is to be measured after charging system on vehicles with a service connection on one side of the refrigerant circuit only, use valve adapter and charging hose with valve opener.

- Switch on A/C service station and evacuate refrigerant circuit for at least 30 minutes. The pressure reading must indicate an absolute pressure of less than 10 mbar (corresponding to 990 mbar vacuum).

NOTE: At this pressure, both green LEDs light for example on A/C service station V.A.G 1885 (currently available A/C service stations.

- Switch off A/C service station and allow to stand for at least 1 hour.
- If the vacuum display (LED chain) does not change, the system is free of leaks and can be charged.

NOTE: A current vacuum reading (LED) is only obtained using A/C service station V.A.G 1885, for example (currently available A/C service stations) after pressing the "Evacuate" button again.







- If with this A/C service station the upper (green) LEDs do not light immediately after switching on, either the refrigerant circuit is leaking or there is still residual moisture/refrigerant in the circuit.

Proceed as follows if the vacuum is not maintained:
- Fill the circuit with 100 g of refrigerant, localize any leaks using leak detector and eliminate accordingly.
- Evacuate and again observe the vacuum display over a period of hours. Charging may only be performed if vacuum is maintained.