| Pressures and temperatures in refrigerant circuit |
Caution | When working on the refrigerant circuit, observe generally valid safety precautions and pressure vessel regulations. |
|
| The pressures and temperatures in the refrigerant circuit depend on the instantaneous operating statuses (e.g. engine speed, radiator fan speed 1, 2, or 3, engine temperature, air conditioner compressor on or off) as well as environmental influences (e.g. ambient temperature, humidity, required cooling output). |
| On vehicles with air conditioner compressor regulating valve -N280- the pressure on the low pressure end is altered by actuating -N280-. |
| For these reasons, the values given in the following table are only to be taken as a guide. They are attained at an engine speed of 1500 to 2000 rpm and an ambient temperature of 20 °C after about 20 minutes. |
| At 20 °C with the engine not running, the pressure in the refrigerant circuit is 4.7 bar → Chapter (vapour pressure table). |
Note | Pressure can be measured in various units: 1 MPa (megapascal) is equivalent to 10 bar gauge pressure, or 145 psi; 1 bar absolute pressure is the same as 0 bar gauge pressure, which is roughly equivalent to atmospheric pressure. |
| t
| Refrigerant circuit with expansion valve → Chapter |
| t
| Refrigerant circuit with restrictor and reservoir → Chapter |
|
|
|
