A/C System, Operating after Filling Refrigerant Circuit

A/C System, Operating after Filling Refrigerant Circuit

• Only start engine after refrigerant circuit has been assembled.

• If possible start engine only with a filled refrigerant circuit.

• Do not start the engine while evacuating the refrigerant circuit or when the circuit is already evacuated (the compressor could be damaged).

• Compressor is always driven by the pulley or by the driveshaft (there is no magnetic clutch). To prevent damage when the compressor is idling, it is lubricated by an internal oil circuit.

• The compressor has an internal oil circuit to ensure the compressor is not damaged when refrigerant circuit is empty. Prerequisite for the internal lubrication is residual refrigerant oil in compressor.

• The engine may only be started when the refrigerant circuit is installed correctly. If for example the refrigerant lines are not connected to the compressor and the engine is started then the compressor may be destroyed by the build-up of internal heat.

• A/C Compressor Regulator Valve (N280) is not activated when the refrigerant circuit is empty and the compressor idles with the engine. As there is no refrigerant in the circuit the oil required to lubricate is not fed to the compressor.

• All removed parts are in again.

• The refrigerant circuit is filled.

If it is necessary to start the engine with a discharged refrigerant circuit:

• Refrigerant circuit must fully assembled.

• There must be no vacuum in the refrigerant circuit.

• At least 1/4 of the specified refrigerant oil must be in the compressor.

• No not rev engine higher than 2500 rpm.

• The engine should only run as long as absolutely necessary.

Note the following when starting engine for first time after filling refrigerant circuit:

- Follow the information on servicing the A/C system after installing the A/C compressor.

- Start engine with compressor switched off (ECON set) the indicator lamp in the Econ button turns on and the indicator lamp in the AC does not turn on) and wait until the engine idle speed has stabilized.

- Open all instrument panel vents.

- Set the temperature preset on the Climatronic Control Module (J255) to cold (for the driver and passenger side).

- Press the Econ or AC button to turn on the A/C compressor (Auto selected and the indicator lamp in the Econ button does not turn on and the lamp in the AC turns on) let the A/C compressor run for at least 5 minutes with the engine in idle.