Refrigerant Circuit Pressures and Temperatures

Refrigerant Circuit Pressures And Temperatures

CAUTION: When performing work on refrigerant circuit, observe all generally applicable safety precautions and pressure vessel regulations.

The pressures and temperatures in refrigerant circuit are dependent on the current operating conditions (e.g. engine RPM, coolant fan stage 1, 2 or 3, engine temperature, A/C compressor on or off) as well as on the effects of ambient influences (e.g. ambient temperature, humidity, requested cooling output).

In vehicles with A/C Compressor Regulator Valve N280 , pressure is modified on the low pressure side by the valve.

For this reason, values indicated in the following table are valid only as reference points. They are attained at an engine speed of 1500 to 2000 RPM and an ambient temperature of 20 degrees C after about 20 minutes.

The connections provided for measuring pressure for the manometer battery are located in the vehicle-specific refrigerant circuit.

At 20 degrees C with the engine not running, the pressure in the refrigerant circuit is 4.7 bar.