Get Air conditioning system -> 1.2.5 Evaporator Guide for 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

1.2.4

Condenser

♦ The condenser -A- transfers heat from the compressed refrig‐

erant gas into the surrounding air.

♦ When this happens, the refrigerant gas condenses to liquid.

Note

♦ Depending on the design of the refrigerant circuit, the receiver

may be attached to the condenser or integrated in the con‐

denser ⇒ Heating, air conditioning system; Rep. gr. 87 ;

Refrigerant circuit (vehicle-specific workshop manual) and ⇒

Electronic parts catalogue .

♦ There are different versions of the condenser; from the outside

these versions can only be identified by their part number.

Version -1- of the condenser is split into two sections (“two-

pass condenser”). Version -2- of the condenser is split into four

sections (“four-pass condenser”).

♦ This illustration shows a condenser with the receiver -C- at‐

tached.

♦ The gaseous refrigerant enters the condenser at connection

-A-; the refrigerant is then cooled down in the condenser and

turns into liquid.

♦ The liquid refrigerant accumulates in receiver -C- (with dryer)

and flows through the bottom cooling section to connection

-B-.

♦ The refrigerant capacity in a refrigerant circuit may differ de‐

pending on the design of the condenser (internal volume, flow,

etc.). Therefore, always ensure the version and allocation of

the condenser are correct ⇒ Heating, air conditioning system;

Rep. gr. 00 ; Technical data (vehicle-specific workshop man‐

ual) and ⇒ Electronic parts catalogue .

1.2.5

Evaporator

There are different types of evaporator. Depending on the design

and function, the thermal energy that is needed to evaporate the

refrigerant is drawn from the air flowing through the system (e.g.

with the evaporator in heater and air conditioning unit or in the

battery cooling module) or the coolant flowing through the system

(e.g. with the heat exchanger for the high-voltage battery) ⇒

Heating, air conditioning system; Rep. gr. 87 ; Refrigerant circuit;

System overview - refrigerant circuit (vehicle-specific workshop

manual).

Note

The following describes 2 versions of the evaporator.

1. Refrigerant circuit

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Arteon 2018 ➤ , Atlas 2017 ➤ , CC 2012 ➤ , Caddy 2016 ➤ , Crafter 201 ...

Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017

Evaporator in heating and air conditioning system (or in the bat‐

tery cooling module)

♦ The liquid refrigerant evaporates in the pipelines of the evap‐

orator -A-. The heat required to do this is drawn from the air

flowing over the evaporator fins -B-. The air cools down. The

refrigerant evaporates and is drawn into the air conditioning

system compressor carrying with it the heat it has absorbed.

♦ A defined quantity of refrigerant is fed to the evaporator

through an expansion valve (restrictor). In systems with an

expansion valve the flow rate is regulated such that only gas‐

eous refrigerant emerges at the evaporator outlet.

♦ When R1234yf refrigerant was introduced, the evaporators

were adapted to the refrigerant, hence the need to observe the

correct version ⇒ Electronic parts catalogue .

Evaporator / heat exchanger for high-voltage battery (chiller)

The liquid refrigerant evaporates in the evaporator (heat ex‐

changer). The heat required to do this is drawn from the coolant

that flows through the evaporator. The coolant cools. The refrig‐

erant evaporates and is drawn into the air conditioner compressor

carrying with it the heat it has absorbed.

A defined quantity of refrigerant is fed to the evaporator through

a restrictor (or an expansion valve) and a shut-off valve. The flow

rate of the coolant (or refrigerant) is regulated in such a way that

only gaseous refrigerant escapes at the evaporator outlet ⇒

Heating, air conditioning; Rep. gr. 87 ; Refrigerant circuit; System

overview - refrigerant circuit (vehicle-specific workshop manual).

1.2.6

Reservoir

Note

This type of air conditioning system is currently only installed in

systems with a restrictor.

Rep. gr.87 - Air conditioning system

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Air conditioning system -> 1.2.5 Evaporator for Your Volkswagen Touran 4 Door Second Generation (2015-2022)

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