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Home >> Audi >> 2020 >> SQ8 Premium Plus >> Repair and Diagnosis >> External Pages >> Different car >> Section 174 (Air Conditioning (Refrigerant R134A Servicing) (General Information)) >> 87 Air Conditioning >> Refrigerant Circuit General Information >> Refrigerant Circuit Pressures And Temperatures >> Refrigerant Circuit With RESTRICTOR And Reservoir

Refrigerant Circuit With RESTRICTOR And Reservoir

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HP- High pressure side of refrigerant circuit.

LP- Low pressure side of refrigerant circuit.

Component Aggregate state of refrigerant Pressure (bar pressure) Temperature in Celsius
-1- A/C compressor, high pressure side Gas up to 20 bar (290.08 psi) up to +70 °C
-2- Condenser From gas to vapor to fluid up to 20 bar (290.08 psi) up to +70 °C
-3- Restrictor From fluid to vapor High pressure side up to 20 bar (290.08 psi); low pressure side greater than 1.0 bar (14.5 psi) High pressure side up to +60 °C; low pressure side warmer than -4 °C (24.8 °F)
-4- Evaporator From vapor to gas Greater than 1.0 bar (14.5 psi) Warmer than -4 °C
-5- Reservoir Gas    
-6- A/C compressor, low pressure side Gas    

Pressures on the low pressure side are maintained at approximately 2 bar (29.01 psi) absolute pressure (corresponds to approximately 1 bar (14.5 psi) positive pressure) by a "regulating" A/C compressor also at various engine speeds. However, this applies only within the performance range of the A/C compressor; if the performance limits of the A/C compressor are exceeded. Refer to PRESSURES, CHECKING .

NOTE:

For vehicles with a A/C Compressor Regulator Valve -N280-, the pressure on the low pressure side is changed by the valve activation.

Arrows point in direction of refrigerant flow.

HP- High pressure side of refrigerant circuit.

LP- Low pressure side of refrigerant circuit.

Fig 1: Identifying Refrigerant Circuit With Restrictor And Reservoir Overview
GWWV87-1409Courtesy of AUDI
  1. A/C Compressor, High Pressure Side
  2. Condenser
  3. Restrictor
  4. Evaporator
  5. Reservoir
  6. A/C Compressor, Low Pressure Side