Bentley Volkswagen.Golf.Jetta.R32.Official.Factory.Repair.Manual.1999-2005

General information on refrigerant circuit
Página 18 de 21
checking on vehicles .
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.
- In vehicles with A/C Compressor Regulator Valve N280 ,
pressure is modified on the low pressure side by the valve.
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.
Component Aggregate state of
refrigerant
Pressure (bar positive
pressure)
Temperature in degrees
Celsius
- 1 - A/C Gas up to 20 bar up to + 70 C
compressor B- side
- 2 - Condenser From gas to vapor up to 20 bar up to + 70 C
to liquid
- 3 - Restrictor From liquid to B-side up to 20 bar, A- B-side up to +60 C, A-side
vapor
side greater than 1.5 bar warmer than -4 C
- 4 - Evaporator From vapor to gas Greater than 1.5 bar Warmer than -4 C
- 5 - Reservoir Gas
- 6 - A/C
compressor A- side
Gas
Pressures on A-side are maintained at approx. 2 bar by the
"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 00-7, Pressures, checking on
vehicles .
Note:
- In vehicles with A/C Compressor Regulator Valve N280 ,
http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Next&type=repair&id=...
13/2/2005