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

Engine all (CAR) 

Overview 

This document contains information on:

• General
• Location
• Function requirements
• Structure
• 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.

Location 

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

Function requirements 

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

Structure 

The electric refrigerant compressor basically consists of the following component parts:

Shown on model 167 

Fig 1: Electric Refrigerant Compressor Components Location - Engine All (Shown On Model 167)

Courtesy of MERCEDES-BENZ USA

Depending on the model, the electrical refrigerant compressor can also be designated with A9/6.

Function 

The control unit and the power electronics regulate the engine speed (from approx. 720 to 9000 RPM) and the refrigerant quantity. The electric motor drives the 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.