Mechanically Driven A/C Compressor
Risk of short circuit
The A/C compressor works with up to 288 volts at 800 to 8, 600 RPM.
Do not touch the A/C compressor when turning on the ignition or when activating the drive machines because of the short circuit risk.
- The A/C compressor extracts the refrigerant gas from the evaporator, compresses it and sends it to the condenser.
- The electric motor for the A/C compressor is supplied with voltage by the Electric Drive Power and Control Electronics -JX1-.
- The A/C Compressor Control Module -J842- integrated in the A/C compressor controls the speed and thereby the output of the A/C compressor (Electrical A/C Compressor -V470-) according to the request received by the data bus. Refer to Vehicle Diagnostic Tester in the"Guided Fault Finding" Function for the A/C System and the Battery Regulation.
- There is no A/C Compressor Regulator Valve -N280- installed in the electrically-driven A/C compressor.
- Check the attachment points on the A/C compressor and the bracket prior to installation. The contact surfaces must be clean and free of rust and grease. Otherwise, repair the contact surfaces with the Contact Surface Cleaning Set :VAS6410 . Refer to WIRING HARNESS AND CONNECTOR REPAIRS .
Check the amount of refrigerant oil in the new A/C compressor if the A/C Compressor Control Module -J842- is faulty. Do not flush the refrigerant circuit with R134a.
The A/C Compressor Control Module -J842- and the Electrical A/C Compressor -V470- are one component and are currently not able to be separated.
There is no A/C Compressor Regulator Valve -N280- installed in the electrically-driven A/C compressor. The A/C compressor output is regulated externally by the A/C compressor speed. Refer to Wiring Diagram and the Vehicle Diagnostic Tester in the"Guided Fault Finding" Function for the A/C System and the Battery Regulation.
The electrically-driven A/C compressor currently functions according to the principle of a spiral charger (similar to a G-charger).
The A/C compressor contains refrigerant oil, which can be mixed with refrigerant R134a under any temperature.
The type plate lists the type of refrigerant required for the A/C compressor.
The installed electronics regulate the A/C compressor power output (and the pressure on the low pressure side as a result) within the specified range (control characteristic) via the speed.
The engine should only be started if the refrigerant circuit is completely assembled.
The A/C compressor is supplied with a specific amount of oil that prevents the A/C compressor from becoming damaged when the refrigerant circuit is empty. This means that approximately 40 to 50 cm3 of refrigerant oil remains in the A/C compressor.
The electrically-driven A/C compressor has a pressure relief valve like the mechanically-driven A/C compressor.
Hybrid drive on vehicles with battery cooling is only possible with a fully charged A/C system in which there are no stored errors for the A/C system. Refer to Vehicle Diagnostic Tester in the"Guided Fault Finding" Function for the A/C system and the Battery Regulation.
After the installing the electrically-driven A/C compressor and the subsequent charging the refrigerant circuit, first start the A/C compressor using the "compressor cut-in" function of the basic setting. If refrigerant oil has accumulated in the A/C compressor compression chamber before installation due to improper storage, this could cause damage to the A/C compressor. Refer to Vehicle Diagnostic Tester in the"Guided Fault Finding" Function for A/C System and Battery Regulation.
Only activate the electrically-driven A/C compressor when the refrigerant circuit is filled. The A/C compressor may become damaged if the A/C compressor is run when the refrigerant circuit is empty. Refer to Vehicle Diagnostic Tester in the"Guided Fault Finding" Function for A/C System and Battery Regulation.