Volkswagen Touran Service Manual: Refrigerant Circuit with Expansion Valve

Volkswagen Touran Service Manual / Heating, Ventilation and Air Conditioning / Refrigerant Circuit General Information / 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. &nbs ...

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