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Refrigerant Circuit With Expansion Valve

A-Low pressure side of refrigerant circuit.

B-High pressure side of refrigerant circuit.

Fig 1: A/C Refrigerant System Pressure Diagram
GWWN00-10142Courtesy of AUDI OF AMERICA, LLC
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) (1) Approximately -7 (20)(2)
    (Approximately 1.8 (26.1))(3) Approximately -1 (30)(3)
-2- A/C compressor A-side Gas Approximately 1.2 (17.4) (1) Approximately -1 (30)
    (Approximately 1.8 (26.1))(3) Approximately -1 (30)(3)
-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) (1) Approximately -7 (20)(2)
    (Approximately 1.8 (26.1))(3) Approximately -1 (30)(3)
(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 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 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.

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