Refrigerant Circuit, Evacuating With Service Station

Refrigerant Circuit, Evacuating With Service Station

- The work procedure is always to be performed as described in the operating instructions for the A/C service station.
- The procedure described here is for the A/C service station VAS 6007A.

Before filling the refrigerant circuit with refrigerant, it should be evacuated (vacuum) for 45 minutes on systems with 1 evaporator and 60 minutes on systems with 2 evaporators. Moisture is also extracted from the circuit.

Evacuating:
- Switch off ignition.
- Check refrigerant oil quantity in refrigerant circuit if necessary.
- Connect service station to power supply.
- Check quantity of refrigerant in the A/C service station.
- 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 hand wheel 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.

- Initiate vacuum phase on the A/C service station. The refrigerant circuit is automatically evacuated (note evacuating time pre-set if necessary).

When the vacuum phase ends, the refrigerant circuit leak test begins. Pressure in bar and seconds are displayed.

Proceed as follows if the vacuum is not maintained:
- Fill the circuit with 100 g of refrigerant, localize any leaks using leak detection system VAS 6196 or leak detection system VAS 6201 and eliminate accordingly.

The Electronic Leak Detector V.A.G 1796 can also be used.
- Evacuate refrigerant circuit again. Only when the vacuum is maintained can the refrigerant circuit be charged.