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1 - Evaporator
2 - Expansion Valve
3 - High Pressure Switch / High
Pressure Sensor
❑ Different versions de‐
pending on vehicle
4 - Service Connection, HP
Side
5 - Fluid Reservoir
❑ Different versions de‐
pending on vehicle
6 - Condenser
7 - Pressure Relief Valve
8 - A/C Compressor, HP side
9 - A/C Compressor, LP side
10 - Pre-volume
❑ Not present on all vehi‐
cles
11 - Service Connection, LP
Side
2.1.14 Refrigerant Circuit with Restrictor and
Reservoir, Pressures and Tempera‐
tures
HP- High pressure side of refrigerant circuit.
LP- Low pressure side of refrigerant circuit.
Component Aggregate State Of Refrig‐
erant
Pressure (Bar Positive
Pressure)
Temperature in Degrees
Celsius
-1- A/C compressor, HP
side
Gas up to 20 bar up to + 70 ℃
-2- Condenser From gas to vapor to fluid up to 20 bar up to + 70 ℃
-3- Restrictor From fluid to vapor HP side up to 20 bar LP
side greater than 1,0 bar
HP side up to + 60 ℃ LP
side warmer than -4 °C
-4- Evaporator From vapor to gas Greater than 1,0 bar Warmer than - 4 ℃
-5- Reservoir Gas
-6- A/C compressor low
pressure side
Gas
Pressures on A-side are maintained at approximately 2 bar ab‐
solute pressure (corresponds to approximately 1 bar positive
pressure) by regulating A/C compressor also at various engine
speeds. However, this applies only within the performance range
Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ...
Refrigerant R134a Servicing - Edition 01.2011
2. Description and Operation 71
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