Service Station, Connecting For Measurement and Testing

Service Station, Connecting For Measurement And Testing

- Work procedure may vary depending on the type of tools selected (the tool-specific operating instructions should therefore be followed).

NOTE: The work procedure is always to be performed as described in the operating instructions for the relevant service station (e.g. V.A.G 1885).

The charging hoses are to be connected as follows to prevent the ingress of air or moisture into the refrigerant circuit:
- Switch off ignition.
- Connect service station to power supply.
- Unscrew caps from service connections or connections with valve (refer to vehicle-specific refrigerant circuit) Heating, air conditioning or Air conditioning.
- Evacuate charging hoses if necessary.
- Connect quick-release coupling to service connection of refrigerant circuit.

CAUTION: Never open valves on low or high-pressure side with engine running, as otherwise compressor or service station could be destroyed by a short circuit between high and low-pressure sides of refrigerant circuit if air conditioning system is switched on.

NOTE: Screw/ valve adapters V.A. G /9, V.A. G/10or Air Conditioning Adapter Set V.A. G 1786 to refrigerant circuit connections with valve and bleed charging hoses during connection to adapters (faintly audible escape of refrigerant gas is permitted).

Vehicles with one service connection only:
- The charging hose must be installed with a valve opener for opening valve in valve adapter.
- Only screw handwheel into quick-release coupling adapter to the extent required to reliably open valve in service connection (observe pressure gauge; take care not to strain valve).
- Start engine and perform planned tests and measurements.
- Compare values determined to specified measured values.
- Before disconnecting quick-release coupling, close it by screwing out handwheel.