Refrigerant circuit with restrictor and reservoir

Arrows show the direction of refrigerant flow.

A- low-pressure side of the refrigerant circuit.

B- high-pressure side of the refrigerant circuit.

Component	Overall state of the refrigerant	Pressure (in bar)	Temperature in degrees Celsius
-1- Air conditioning system compressor B-side	Gas	up to 20 bar	to +70 °C
-2- Condenser	from gas through vapour to liquid	up to 20 bar	to +70 °C
-3- Restrictor	from liquid to vapour	B-side up to 20 bar, A-side greater than 1.5 bar	B-side up to +60 °C, A-side warmer than -4°C
-4- Evaporator	from vapour to gas	greater than 1.5 bar	warmer than -4°C
-5- Reservoir	Gas
-6- Air conditioning system compressor A-side	Gas

The pressures on the A-side are held at approx. 2 bar by the “regulating” air conditioner compressor even at differing engine speeds. This applies however only within the rated range of the air conditioner compressor ; if the rated range of the air conditioner compressor is exceeded, the pressure will increase → Chapter. Note In vehicles with air conditioner compressor regulating valve -N280-, the pressure on the low-pressure side is varied by activating the valve.