Get Air conditioning system -> 1.2.3 Electrical air conditioner compressor for hybrid vehicles 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

♦ On an air conditioner compressor with electromagnetic clutch

-A- and regulating valve -C-, the electromagnetic clutch -A- is

usually only actuated if the regulating valve -C- is also actu‐

ated ⇒ Heating, air conditioning system; Rep. gr. 87 ; Refrig‐

erant circuit .

1.2.3

Electrical air conditioner compressor for

hybrid vehicles

Vehicles with high-voltage system (hybrid vehicles)

If repair work in the vicinity of high-voltage components and ca‐

bles is necessary, inspect high-voltage components and cables

for damage ⇒ page 4 ⇒ Electrical system; Rep. gr. 93 ; General

warnings for work on the high-voltage system .

If work on the components of the high-voltage system is neces‐

sary, ensure that the high-voltage system is de-energised ⇒ Rep.

gr. 93 ; De-energising high-voltage system .

De-energise the high-voltage system and restarting the high-volt‐

age system ⇒ Rep. gr. 93 ; De-energising high-voltage system

– To minimise the number of automatic engine starts when the

vehicle's drive system is active (READY) during test and

measurement work, charge the vehicle batteries e.g. with the

battery charger 60 A - VAS 5904- in battery standby mode ⇒

Electrical system - General information; Rep. gr. 27 ; Charging

battery and ⇒ Electrical system; Rep. gr. 93 ; General warn‐

ings for work on the high-voltage system .

Rep. gr.87 - Air conditioning system

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

– For testing and measuring work that requires the vehicle's

drive system to be active (READY) or the ignition to be switch‐

ed on, move the selector lever to position “P”, activate the

parking brake, and arrange the tools needed so that they can‐

not come into contact with moving components of the engine

and so that they cannot even come near to components that

turn when the engine is running.

Electrical air conditioner compressor

NOTICE

Risk of irreparable damage to electrical air conditioner com‐

pressor from short circuit.

– Never touch the air conditioner compressor when switching

on the ignition or starting the drive machines.

♦ The air conditioner compressor draws refrigerant gas from the

evaporator, compresses it and sends it to the condenser.

♦ The electric motor of the air conditioner compressor is sup‐

plied with power e.g. from the power and control electronics

for electric drive - JX1- ⇒ Current flow diagrams, Electrical fault

finding and Fitting locations.

♦ The control unit for air conditioner compressor - J842- inte‐

grated in the air conditioner compressor regulates the speed

and thereby the performance of the air conditioner compressor

( electrical air conditioner compressor - V470- ) according to

the request received via the data bus ⇒ Vehicle diagnostic

tester in “Guided Fault Finding” function of air conditioning

system and battery control system

♦ There is no air conditioner compressor regulating valve -

N280- in the electrical air conditioner compressor.

♦ The bolting points of the air conditioner compressor and the

bracket must be checked prior to installation. The contact sur‐

faces must be free of dirt, rust and grease. Otherwise, repair

contact surfaces using contact surface cleaning set - VAS

6410- ⇒ Electrical system; General information; Rep. gr. 97 ;

Wiring harness and connector repair .

1. Refrigerant circuit

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

Note

♦ If the air conditioner compressor control unit - J842- is defec‐

tive, the amount of refrigerant oil in the new air conditioner

compressor must be adjusted. The refrigerant circuit must not

be cleaned (flushed) with R1234yf.

♦ The control unit for air conditioner compressor - J842- and the

electrical air conditioner compressor - V470- are one compo‐

nent and can currently not be separated.

♦ There is no -N280- installed in the electrical air conditioner

compressor. The power of the air conditioner compressor is

regulated externally by the speed of the air conditioner com‐

pressor ⇒ Current flow diagrams, Electrical fault finding and

Fitting locations and ⇒ Vehicle diagnostic tester in “Guided

Fault Finding” mode - air conditioning system and battery reg‐

ulation.

♦ The electrical air conditioner compressor currently works in

the same way as a spiral or scroll-type charger (similar to a G-

Lader).

♦ The air conditioner compressor contains refrigerant oil, which

can be mixed with R1234yf refrigerant at any temperature.

♦ The identification plate states the refrigerant for which the air

conditioner compressor is suitable.

♦ The integrated electronics regulate the performance of the air

conditioner compressor via the speed (and thereby the pres‐

sure on the low-pressure side) within the specific target range

(control characteristic).

♦ The engine should be started only when the refrigerant circuit

has been fully assembled.

♦ The air conditioner compressor has an internal oil circuit to

ensure that the air conditioner compressor is not damaged

when the refrigerant circuit is empty. This means that approx.

40 to 50 cm³of refrigerant oil remain in the air conditioner

compressor.

♦ Just like the mechanical air conditioner compressor, the elec‐

trical air conditioner compressor has a pressure relief valve.

♦ On vehicles with battery cooling, electric and hybrid operation

is only possible with the air conditioning system charged and

no faults stored in connection with the air conditioning system

⇒ Vehicle diagnostic tester in “Guided Fault Finding” mode -

air conditioning system and battery regulation.

♦ First bring the electrical air conditioner compressor into oper‐

ation after installing the air conditioner compressor and charg‐

ing the refrigerant circuit via the “Compressor run-in” function

in basic settings. Should there be an accumulation of refriger‐

ant oil in the compression chamber of the air conditioner

compressor before installation owing to unfavourable storage,

damage could be caused to the air conditioner compressor

⇒ Vehicle diagnostic tester in “Guided Fault Finding” mode -

air conditioning system and battery regulation.

♦ An electrically driven air conditioner compressor may only be

activated when the refrigerant circuit is charged. Running the

air conditioner compressor with the refrigerant circuit empty

could lead to compressor damage ⇒ Vehicle diagnostic tester

in “Guided Fault Finding” mode.

Rep. gr.87 - Air conditioning system

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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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Air conditioning system -> 1.2.3 Electrical air conditioner compressor for hybrid vehicles for Your Volkswagen Touran 4 Door Second Generation (2015-2022)

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