Audi A8 1994 - Page 73

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
♦ A/C compressor, refer to
⇒ “2.1.1 A/C Compressor“, page 41 .
♦ Condenser, refer to ⇒ “2.1.3 Condenser“, page 58 .
♦ Evaporator, refer to ⇒ “2.1.6 Evaporator“, page 60 .
♦ Reservoir, refer to ⇒ “2.1.16 Reservoir“, page 73 .
♦ Restrictor, refer to ⇒ “2.1.17 Restrictor“, page 74 .
♦ Fluid Reservoir, refer to ⇒ “2.1.8 Fluid Reservoir“, page 62 .
♦ Expansion valve, refer to
⇒ “2.1.7 Expansion Valve“, page 61 .
♦ Refrigerant pipe with inner heat exchanger, refer to
⇒ “2.1.15 Refrigerant Pipe With Inner Heat Exchanger“, page
73 .
♦ Quick-release connections on the refrigerant lines, refer to
⇒ “1.4.5 Quick-Release Connections on Refrigerant Lines“,
page 25 .
♦ O-rings, refer to ⇒ “2.1.10 O-Ring Seals“, page 68 .
♦ Refrigerant Circuit Pipes and Hoses, refer to
⇒ “1.4.7 Refrigerant Circuit Pipes and Hoses“, page 26 .
♦ Pressure Relief Valve, refer to
⇒ “2.1.11 Pressure Relief Valve“, page 68 .
2.1.13 Refrigerant Circuit with Expansion
Valve, Pressures and Temperatures
HP- High pressure side of refrigerant circuit.
LP- Low pressure side of refrigerant circuit.
Component Aggregate State Of Re‐
frigerant
Pressure (Bar Positive
Pressure)
Temperature in Degrees
Celsius
-1- Evaporator, from input
to output
Vapor
approximately 1.2 bar
1)
1 approximately -7 ℃
2)
2
-2- Expansion valve Fluid, released as vapor approximately 14 bar approximately + 55 ℃
(HP- side), reduces to -7
°C (LP-side)
-3-High pressure switch /
high pressure sensor
Fluid approximately 14 bar approximately +55 ℃
-4- HP-side service con‐
nection
and
-5- Fluid reservoir
Fluid approximately 14 bar approximately +55 ℃
-6- Condenser From gas (at input) via
vapor to fluid (at outlet)
approximately 14 bar From approximately + 65
℃ (at input) to approxi‐
mately + 55 ℃ (at outlet)
-7- Pressure relief valve
and
-8- A/C compressor, HP-
side
Gas approximately 14 bar approximately +65 ℃
-9- A/C compressor low
pressure side
Gas
approximately 1.2 bar
1)
1 approximately -1 ℃
2)
2
-10- Pre-volume (not
present in all vehicles) and
-11- LP-side service con‐
nection
Gas
approximately 1.2 bar
1)
1 approximately -1 ℃
2)
2
1) 1- Pressure in refrigerant circuits is maintained at approximately 2 bar absolute pressure (corresponds to approximately 1 bar positive
pressure), regulated by A/C compressor, even though heat transfer changes and engine speeds vary. However, this applies only within
Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ...
Refrigerant R134a Servicing - Edition 01.2011
2. Description and Operation 69