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

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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

⇒ “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

⇒ “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).

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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.

1. Refrigerant circuit

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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.

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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)

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