Electric Refrigerant Compressor, Basic Function - GF83.55-P-2000A

Engine all (CAR) 

Example illustration of electric refrigerant compressor 

Fig 1: Electric Refrigerant Compressor Components Location - Model All (Car)

Courtesy of MERCEDES-BENZ USA

Overview 

This document contains information on:

• General 
• Function requirements 
• Function 

General 

The electric refrigerant compressor draws in and compresses the refrigerant. It is driven by an electric motor, which is integrated into the refrigerant compressor.

This means that the refrigerant compressor can be operated regardless of the engine speed of the combustion engine.

The electric refrigerant compressor is regulated by the climate control, control system.

The electric refrigerant compressor is fitted at the combustion engine (e.g. on vehicles with 48V technology) or at the electric machine (e.g. on vehicles with electric drive).

Function requirements 

• Circuit 30t ON
• Climate control switched on
• Refrigerant compressor switched on (A/C function)

Function 

The control unit and the power electronics integrated into the electric refrigerant compressor regulate the engine speed (from approx. 720 to 9000 rpm) and the refrigerant quantity.

The electric motor drives a spiral compressor. This consists of two intertwined spirals, one of which is permanently connected to the housing while the other rotates in a circle in the first one.

The spirals here form several increasingly smaller chambers within the coils. The refrigerant compressed in this way reaches the center in these chambers, where it then exits again.