Discharging Refrigerant Circuit Using Service Station - II

Discharging Refrigerant Circuit Using 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 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.

- 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.

An additional method for finding leaks is bringing pressure to the refrigerant circuit (e.g. 15 bar nitrogen) and coating the circuit connections with a soap solution and looking for leaks.
- Evacuate refrigerant circuit again. Only when the vacuum is maintained can the refrigerant circuit be charged.