Component description for electric refrigerant compressor - GF83.55-P-2110RFH
Model 205.012/047/147/212/247
Shown on engine 651, model 205.012/212
Shown on engine 274, model 205.047/147/247
Location
The electric refrigerant compressor is located on the left side of the engine.
Task
The electric refrigerant compressor is responsible for intake and compression of the refrigerant. The speed of the electric refrigerant compressor is continuously regulated as a function of the evaporator temperature from 700 up to 9000 RPM.
The climate-control control unit (N22/1) actuates the electric refrigerant compressor via the climate control LIN 2 (LIN B8-2).
Pressing the "OFF" or the "A/C" button on the front climate control operating unit (N58/1) switches off the electric A/C compressor. The other functions of the automatic air conditioning are still available. However, a cool-down below the current outside temperature is not possible.
Switching on the electric refrigerant compressor can also be requested by the high-voltage battery cooling function or the pre-entry climate control function.
High-voltage battery cooling system function:
The battery management system control unit (N82/2) sends the request to switch on the electric refrigerant compressor over the hybrid CAN (CAN L), powertrain control unit (N127), chassis FlexRay (Flex-E), electronic ignition lock control unit (N73) and the interior CAN (CAN B) to the climate-control control unit.
Pre-entry climate control function:
The electronic ignition lock control unit transmits the status of the central locking via the interior CAN to the climate control unit. The climate-control control unit then initiates the pre-entry climate control.
The powertrain control unit sends the request to switch on the pre-entry climate control via the chassis FlexRay, electronic ignition lock control unit, and interior CAN to the climate control unit. The climate-control control unit then initiates the pre-entry climate control. The electric refrigerant compressor is switched off depending on the outside temperature and after an accident. If the outside temperature T < -10 °C, the electric refrigerant compressor is generally switched off.
The electric refrigerant compressor is diagnosed using the diagnostic tester.
Body
The electric refrigerant compressor control unit regulates the rotational speed of the electric motor and the quantity of refrigerant. The electric motor drives the spiral compressor. This consists of two intertwined spirals, one of which is permanently connected to the housing while the second rotates in a circle in the first one. The spirals here form several increasingly smaller chambers within the coils. In these chambers, the refrigerant compressed in this manner reaches the center, where it then exits compressed.
| Wiring diagram for electric refrigerant compressor | PE83.55-P-2000-97FBA |