Volkswagen Golf Service & Repair Manual: Refrigerant circuit with restrictor and reservoir

Volkswagen Golf Service & Repair Manual / Air conditioning system with refrigerant R134a / General information on refrigerant circuit / Electrical components not installed in refrigerant circuit / 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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