2015-2022 Volkswagen Touran 4 Door Air conditioning system -> 1.2.1 Layout and function of refrigerant circuit User Manual
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Air conditioning system -> 1.2.1 Layout and function of refrigerant circuit for Your Volkswagen Touran 4 Door Second Generation (2015-2022)

Arteon 2018 ➤ , Atlas 2017 ➤ , CC 2012 ➤ , Caddy 2016 ➤ , Crafter 201 ...  
Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017  
1.2  
General description - components of re‐  
frigerant circuit  
⇒ “1.2.1 Layout and function of refrigerant circuit”, page 36  
⇒ “1.2.2 Mechanical air conditioner compressor”, page 38  
⇒ “1.2.3 Electrical air conditioner compressor for hybrid vehicles”,  
page 40  
⇒ “1.2.4 Condenser”, page 43  
⇒ “1.2.5 Evaporator”, page 43  
⇒ “1.2.6 Reservoir”, page 44  
⇒ “1.2.7 Heat exchanger for heat pump mode”, page 45  
⇒ “1.2.8 Liquid receiver”, page 45  
⇒ “1.2.9 Restrictor”, page 46  
⇒ “1.2.10 Receiver”, page 47  
⇒ “1.2.11 Expansion valve (with and without shut-off valve)”, page  
48  
⇒ “1.2.12 Refrigerant shut-off valves”, page 50  
⇒ “1.2.13 Refrigerant line with internal heat exchanger”,  
page 51  
⇒ “1.2.14 Quick release couplings of refrigerant lines”,  
page 51  
lk  
⇒ “1.2.15 Seals”, page 52  
⇒ “1.2.16 Pipes and hoses in refrigerant circuit”, page 52  
⇒ “1.2.17 High-pressure safety valve”, page 53  
⇒ “1.2.18 Non-return valves”, page 54  
⇒ “1.2.19 Quick-release coupling connections in refrigerant cir‐  
cuit”, page 55  
⇒ “1.2.20 Connections with valve for switches in refrigerant circuit  
”, page 59  
⇒ “1.2.21 Pressure senders and switches in refrigerant circuit”,  
page 59  
⇒ “1.2.22 Refrigerant pressure and temperature sender”,  
page 60  
⇒ “1.2.23 Air conditioner compressor regulating valve N280 ”,  
page 63  
⇒ “1.2.24 Refrigerant temperature sender”, page 63  
1.2.1  
Layout and function of refrigerant circuit  
♦ Located on the high-pressure side are the condenser, receiver  
and restrictor or expansion valve to separate the high-pres‐  
sure side (HD) and low-pressure side (ND).  
♦ High pressure is created by the restrictor or expansion valve  
forming a constriction and causing the refrigerant to build up,  
thus leading to increased pressure and temperature.  
♦ Excessive pressure results if the circuit is filled with too much  
refrigerant or refrigerant oil, or the condenser is dirty, the ra‐  
diator fan is defective, there is a blockage in the system or  
there is moisture in the refrigerant circuit (causing the restrictor  
or expansion valve to ice up).  
36  
Rep. gr.87 - Air conditioning system  
GETth  
Arteon 2018 ➤ , Atlas 2017 ➤ , CC 2012 ➤ , Caddy 2016 ➤ , Crafter 201 ...  
Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017  
♦ Located on the low-pressure side are the evaporator, the tem‐  
perature sensor for the evaporator and the air conditioner  
compressor that acts as the separation between the high-  
pressure (HD) and low-pressure (ND) gas sides.  
♦ A loss of pressure in the system can be due to loss of refrig‐  
erant, restrictor or expansion valve defective or blocked, de‐  
fective air conditioner compressor or an iced-up evaporator.  
lk  
1. Refrigerant circuit  
37  
GETth  
Arteon 2018 ➤ , Atlas 2017 ➤ , CC 2012 ➤ , Caddy 2016 ➤ , Crafter 201 ...  
Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017  
1.2.2  
Mechanical air conditioner compressor  
The air conditioner compressor is driven by a poly V-belt -B- or a  
shaft by the engine.  
Air conditioner compressor with air conditioning system magnetic  
clutch - N25- :  
An electromagnetic clutch -A- attached to the air conditioner com‐  
pressor provides power transfer between pulley -B- and com‐  
pressor crankshaft when the air conditioning is switched on.  
An overload protection device attached to the clutch plate or fitted  
in the solenoid of the air conditioner compressor triggers if there  
is resistance in the air conditioner compressor (sluggish move‐  
ment), protecting the belt drive or the drive unit against overload.  
Note  
♦ To ensure that the air conditioner compressor is not damaged  
if the refrigerant circuit is empty, the air conditioner compres‐  
sor regulating valve - N280- and, under certain circumstances,  
the air conditioning system magnetic clutch - N25- are no lon‐  
ger actuated (the air conditioner compressor only runs at idle  
with the engine if -N25- is actuated).  
♦ An air conditioner compressor with -N25- (without -N280- ) is  
not actuated if the refrigerant circuit is empty and is therefore  
not driven.  
Air conditioner compressor without air conditioning system mag‐  
netic clutch - N25- :  
♦ An overload protection device attached to the pulley -B- or fit‐  
ted in the drive unit of the air conditioner compressor triggers  
if there is resistance in the air conditioner compressor (slug‐  
gish movement), protecting the belt drive or the drive unit  
against overload.  
♦ An air conditioner compressor with air conditioner compressor  
regulating valve - N280- (without -N25- ) is switched over to  
internal lubrication via a valve if the refrigerant circuit is empty.  
Note  
♦ On air conditioner compressors without air conditioning sys‐  
tem magnetic clutch - N25- , the engine may only be started  
following complete assembly of the refrigerant circuit.  
♦ To ensure that the air conditioner compressor suffers no dam‐  
age if the refrigerant circuit is empty, the air conditioner com‐  
pressor regulating valve - N280- is no longer activated (the air  
conditioner compressor idles with the engine).  
All air conditioner compressors  
The air conditioner compressor draws refrigerant gas from the  
evaporator, compresses it and sends it to the condenser.  
38  
Rep. gr.87 - Air conditioning system  
GETth  

Related Topics

Air conditioning system
1 Refrigerant circuit 1.1 System overview - refrigerant circuit 1.1.1 System overview - refrigerant circuit with expansion valve and receiver 1.1.2 System overview - refrigerant circuit with restrictor and reservoir 1.1.3 System overview - refrigerant circuit with electrically driven air conditioner compressor 1.2 General description - components of refrigerant circuit 1.2.2 Mechanical air conditioner compressor 1.2.3 Electrical air conditioner compressor for hybrid vehicles 1.2.4 Condenser 1.2.5 Evaporator 1.2.6 Reservoir 1.2.7 Heat exchanger for heat pump mode 1.2.8 Liquid receiver 1.2.9 Restrictor 1.2.10 Receiver 1.2.11 Expansion valve (with and without shut-off valve) 1.2.12 Refrigerant shut-off valves 1.2.13 Refrigerant line with internal heat exchanger 1.2.14 Quick release couplings of refrigerant lines 1.2.15 Seals 1.2.16 Pipes and hoses in refrigerant circuit 1.2.17 High-pressure safety valve 1.2.18 Non-return valves 1.2.19 Quick-release coupling connections in refrigerant circuit 1.2.20 Connections with valve for switches in refrigerant circuit 1.2.21 Pressure senders and switches in refrigerant circuit 1.2.22 Refrigerant pressure and temperature sender 1.2.23 Air conditioner compressor regulating valve N280 1.2.24 Refrigerant temperature sender 1.3 Possible complaints 1.3.1 Prerequisites for investigating a complaint 1.3.2 Possible complaints 1.3.3 Odours from heater and air conditioner unit 1.4 Investigating leaks 1.4.1 General information about investigating leaks in the refrigerant circuit 1.4.2 Searching for leaks in refrigerant circuits using an electronic leak detector 1.4.3 Searching for leaks with UV leak detection system 1.4.4 Detecting leaks in a vacuum test using air conditioner service station, or in a pressure test 1.4.5 Detecting leaks in a pressure test (with nitrogen or compressed air) 1.5 Renewing components 1.5.1 General information about renewing components 1.5.2 Renewing leaking or damaged components of empty refrigerant circuit 1.5.3 Renewing leaking or damaged components of charged refrigerant circuit 1.5.4 Renewing air conditioner compressor with no need to clean refrigerant circuit 1.5.5 Renewing air conditioner compressor due to leaks or internal damage 1.5.6 Renewing desiccant cartridge / receiver after cleaning refrigerant circuit 1.5.7 Renewing receiver with no need to clean refrigerant circuit 1.5.8 Renewing desiccant cartridge / desiccant bag with no need to clean refrigerant circuit 1.6 Cleaning refrigerant circuit 1.6.1 General information about cleaning refrigerant circuit 1.6.2 Preparations for cleaning refrigerant circuit (flushing with R1234yf refrigerant) 1.6.3 Refrigerant circuit cleaning procedure 1.6.4 Principle circuit diagrams for cleaning (flushing circuits) - refrigerant circuit with expansion valve and receiver 1.6.5 Principle circuit diagrams for cleaning (flushing circuits) - refrigerant circuit with restrictor and receiver 1.6.6 Principle circuit diagrams for cleaning (flushing circuits) - vehicles with high-voltage system (without auxiliary) 1.6.7 Principle circuit diagrams for cleaning (flushing circuits) - vehicles with high-voltage system (with auxiliary) 1.6.8 Adapters for setting up flushing circuits 1.6.9 General information about blowing through with compressed air or nitrogen 1.6.10 Blowing through refrigerant circuit with compressed air or nitrogen 1.7 Checking pressures with pressure gauge 1.7.1 Display on pressure gauges 1.7.2 Pressure gauges enable the following test and measurement work 2 Working with air conditioner service station 2.1 Working with air conditioner service station 2.2 Connecting air conditioner service station to refrigerant circuit 2.3 Performing gas analysis of refrigerant 2.4 Emptying refrigerant circuit 2.5 Evacuating refrigerant circuit 2.6 Charging refrigerant circuit 2.7 Bringing air conditioning system into service after charging 2.8 Switching off air conditioner service station and separating from refrigerant circuit 2.9 Charging refrigerant in reservoir 2.10 Emptying air conditioner service station 2.11 Cleaning electrical air conditioning compressor 2.12 Cleaning refrigerant circuit 2.13 Filling contaminated refrigerant in a recycling cylinder for analysis, processing or disposal 2.13.1 Filling contaminated refrigerant in a recycling cylinder using technical equipment 2.13.2 Filling undercooled contaminated refrigerant in a recycling cylinder 2.14 Checking pressures 2.14.1 General information on checking pressures in the refrigerant circuit 2.14.2 Pressures and temperatures in refrigerant circuit 2.14.3 Checking pressures in the refrigerant circuit with the ignition switched off 2.14.4 Checking pressures with air conditioning system switched on - vehicles with mechanical air conditioning compressor 2.14.5 Checking pressures with air conditioning system switched on - vehicles with electrical air conditioning compressor 3 Testing equipment and tools 3.1 Tools and materials available from distribution centre or importer 3.2 Tools and materials available commercially 3.3 Tools that can be locally manufactured

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