VW Golf manuals

Volkswagen Golf Service & Repair Manual: 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.

Refrigerant circuit with restrictor and reservoir
 

     
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.
Refrigerant circuit with expansion valve
A- low-pressure side of the refrigerant circuit. B- high-pressure side of the refrigerant circuit.         ...

Test and measurement work that can be performed using a pressure gauge
Displays on the pressure gauge 1 -  Temperature scale for refrigerant R134a CF3–CH2F or CH2F–CF3. 2 -& ...

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