volkswagen Workshop Repair Guides

Volkswagen Workshop Service and Repair Manuals

Refrigerant circuit with restrictor and reservoir > < Pressures and temperatures in the refrigerant circuit
Refrigerant circuit with expansion valve
   
Refrigerant circuit with expansion valve
A- low-pressure side of the refrigerant circuit.
B- high-pressure side of the refrigerant circuit.

   
ComponentOverall state of the refrigerantPressure (in bar)Temperature in degrees Celsius
-1- evaporator, from inlet to outletVapourapprox. 1.2 bar → Remarkapprox. -7 °C → Remark
  (approx. 1.8 bar) → Remarkapprox. -1° C → Remark
-2- Air conditioning system compressor A-sideGasapprox. 1.2 bar → Remarkapprox. -1 ℃
  (approx. 1.8 bar) → Remark(approx. -1° C) → Remark
-3- Air conditioning system compressor B-sideGasapprox. 14 barapprox. +65° C
-4- CondenserGas, vapour, liquidapprox. 14 barat outlet approx. + 55° C
-5- ReceiverLiquidapprox. 14 barapprox. +55° C
-6- Extraction and charging valve, B sideLiquidapprox. 14 barapprox. +55° C
-7-Expansion valveLiquid, released into vapourapprox. 14 barapprox. +55° C, reduced to -7° C
-8- Extraction and charging valve, A sideGasapprox. 1.2 bar → Remarkapprox. -7 °C → Remark
  (approx. 1.8 bar) → Remarkapprox. -1° C → Remark

1)  The pressure in refrigerant circuits with regulating air conditioner compressor is held to approx. 2 bar despite changing heat transport and 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.
2)  The temperature in refrigerant circuits with regulating air conditioner compressor is held within the regulation range of the air conditioner compressor despite changing heat transport and 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 temperature will increase → Chapter.
3)  Measured values for air conditioning systems with two evaporators
  Note
t  Air conditioning system compressors that do not self-regulate their load are switched off by the respective control unit via the air conditioner compressor regulating valve -N280- when an evaporator temperature less than 0° C is sensed.
t  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 restrictor and reservoir > < Pressures and temperatures in the refrigerant circuit