| Pressures and temperatures in the refrigerant circuit and its arrangement |
Caution | When working on the refrigerant circuit, observe the generally applicable safety instructions and the pressure tank regulation → Chapter. |
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| The pressures and temperatures in the refrigerant circuit are dependent on current operating conditions (e.g. engine speed, radiator fan stage 1, 2 or 3, engine temperature, AC compressor on or off) as well as on the effect of the environmental characteristics (e.g. ambient temperature, humidity, required cooling capacity). |
| On vehicles with the regulating valve for compressor of air conditioning system -N280-, the pressure on the low-pressure side is changed by the actuation of the valve. |
| Air conditioning compressors which do not regulate their own power output are switched off by the relevant control unit via the regulating valve for compressor of air conditioning system -N280- at an evaporator temperature below 0°C. |
| This is why the indicated values in the following table are only reference points. They are set after approx. 20 mins and at an engine speed of 1500 to 2000 rpm and an ambient temperature of 20°C. |
| At 20 °C and if the engine is stationary, a pressure of 4.7 bar arises in the refrigerant circuit → Chapter. |
Note | The pressure is given in different units, 1 MPa equals 10 bar overpressure or 145 psi. One bar absolute pressure plus 0 bar overpressure corresponds approximately to the ambient pressure (atmospheric pressure). |
| Pressures, temperatures and arrangement of the refrigerant circuit with expansion valve → Chapter. |
| Pressures, temperatures and arrangement of the refrigerant circuit with throttle → Chapter. |
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