the performance range of the A/C compressor; if the performance limits of the A/C compressor are exceeded, the pressure increases, refer
to ⇒ “4.4 Pressures, Checking“, page 153 .
2) 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 com‐
pressor; if the performance limits of the A/C compressor are exceeded, the temperature increases, refer to
⇒ “4.4 Pressures, Checking“, page 153 .
Note
♦
A/C compressors which do not regulate their performance are
switched off by the respective control module via the A/C com‐
pressor regulator valve -N280- at an evaporator temperature
below 0° C.
♦
In vehicles with A/C compressor regulator valve -N280- , the
pressure is modified on the low pressure side by the valve.
♦
Temperature and pressure in the refrigerant circuit in vehicles
with two evaporators and two expansion valves correspond to
those in vehicles with only one evaporator and one expansion
valve (parallel switching).
♦
Depending on the version of the refrigerant circuit, a compo‐
nent with an inner heat exchanger may be installed (for ex‐
ample, on the Audi A4 from MY 2008 and on the Audi A5
Coupe from MY 2008, a refrigerant line with an inner heat ex‐
changer). Inside the inner heat exchanger, the flowing fluid
warm refrigerant on the high pressure side is delivered into the
low pressure side as flowing, vapor, cold refrigerant to in‐
crease the efficiency of the A/C system. Refer to
⇒ “2.1.15 Refrigerant Pipe With Inner Heat Exchanger“, page
73 .
Arrows point in direction of refrigerant flow.
HP- High pressure side of refrigerant circuit.
LP- Low pressure side of refrigerant circuit.
Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ...
Refrigerant R134a Servicing - Edition 01.2011
70 Rep. Gr.00 - General, Technical Data
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