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 ...

Refrigerant Circuit with Restrictor and Reservoir
Arrows point in direction of refrigerant flow. A-Low pressure side of refrigerant circuit. B-High pressure side of refrigerant circuit.     ...

Other materials:

Two-Part Spray Filling Paste
Definition: Two-Part Spray Filling Paste -ALN 788 007- Edition 06/2011 Product Description The Two-Part Spray Filling Paste -ALN 788 007- is a two-part spray filling paste us ...

Run-Flat Tire, General Information
Run-flat tires have a reinforced sidewall in comparison to standard tires. This reduces the tendency for the sidewall to roll when there is a loss of pressure and prevents the sides of the tire from being pinched. This allows the vehicle to be driven whi ...

Restrictor
  Caution Non-approved tools or materials such as leak sealing additives can cause damage or malfunctions in the system. Only use tools and materials approved by the manufactu ...

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