Refrigerant Circuit, Evacuating Using Service Station

Refrigerant Circuit, Evacuating 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.
The refrigerant circuit must be evacuated before it is filled with refrigerant (vacuum). Moisture is also extracted from the circuit.

Evacuating:
- Switch ignition off.
- Correct the refrigerant oil quantity in the refrigerant circuit if necessary.
- Connect service station to power supply.
- Check quantity of refrigerant in the service station.
- Connect charging hoses of 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 service station. Refrigerant circuit is evacuated automatically.

Once vacuum phase has ended, begin testing refrigerant circuit for proper seal. Negative pressure in bar and seconds will be 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 and eliminate accordingly.

Leak detector V.A.G 1796 can also be used.
- Evacuate refrigerant circuit once more. Only when the vacuum is maintained can the refrigerant circuit be charged.