VW Polo manuals

Volkswagen Polo Service & Repair Manual: Refrigerant Circuit with Expansion Valve

A-Low pressure side of refrigerant circuit.
B-High pressure side of refrigerant circuit.

Refrigerant Circuit with Expansion Valve
 

     
Component Aggregate State of Refrigerant Pressure bar (psi) Positive Pressure Temperature in Degrees Celsius (Fahrenheit)
-1- Evaporator, from input to output Vapor Approximately 1.2 (17.4) → Note Approximately -7 (20) → Note
    (Approximately 1.8 (26.1)) → Note Approximately -1 (30) → Note
-2- A/C compressor A-side Gas Approximately 1.2 (17.4) → Note Approximately -1 (30)
    (Approximately 1.8 (26.1)) → Note Approximately -1 (30) → Note
-3- A/C compressor B-side Gas Approximately 14 (203.1) Approximately 65 (149)
-4- Condenser Gas, vapor, fluid Approximately 14 (203.1) Approximately 55 (131) at outlet
-5- Receiver Fluid Approximately 14 (203.1) Approximately 55 (131)
-6- Extraction and filling valve, B-side Fluid Approximately 14 (203.1) Approximately 55 (131)
-7- Expansion valve Fluid, released as vapor Approximately 14 (203.1) Approximately 55 (131), reduced to -7 (20)
-8- Extraction and filling valve, A-side Gas Approximately 1.2 (17.4) → Note Approximately -7 (20) → Note
    (Approximately 1.8 (26.1)) → Note Approximately -1 (30) → Note
 
1)  Pressure in refrigerant circuits is maintained at approximately 2 bar (29 psi), regulated by A/C compressor, even though heat transfer changes and engine speeds vary. However, this applies only within the performance range of the A/C compressor; if the performance limits of the A/C compressor are exceeded, the pressure increases. Refer to → Chapter „Pressures, Checking“.
2)  Within the control range of the A/C compressor, temperature in the refrigerant circuits is maintained, regulated by A/C compressor, even though heat transfer changes and engine speeds vary. However, this applies only within the performance range of the A/C compressor; if the performance limits of the A/C compressor are exceeded, the temperature increases. Refer to → Chapter „Pressures, Checking“.
3)  Measured values for A/C systems with two evaporators
  Note
A/C compressors which do not regulate their performance are switched off by the respective control module via the A/C Compressor Regulator Valve -N280- at an evaporator temperature below 0 °C (32 °F).
In vehicles with A/C Compressor Regulator Valve -N280-, the pressure is modified on the low pressure side by the valve.
   
Refrigerant Circuit Pressures and Temperatures
  WARNING When performing work on refrigerant circuit, observe all generally applicable safety precautions and pressure ...

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