Get Air conditioning system Working with air conditioner service station -> 2.8 Switching off air conditioner service station and separating from refrigerant circuit Guide for Volkswagen Sharan VAN Second Generation (2010-2023)

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Air conditioning systems with refrigeranR1234yf - General information - Edition 07.2017

– Switch off ignition.

– Detach the air conditioner service station from the refrigeran

circuiand switch off

⇒ “2.8 Switching off air conditioner service station and sepa‐

rating from refrigerancircuit”, page 151 .

Vehicles with electrical air conditioning compressor

•

The engine may only be started when the refrigerancircui

has been fully assembled.

•

On vehicles with battery cooling, hybrid operation is only pos‐

sible with the air conditioning system charged and no faults

stored in connection with the air conditioning system ⇒ Vehicle

diagnostic tester in “Guided FaulFinding” mode - air condi‐

tioning system and battery regulation.

•

Firsbring the electrical air conditioner compressor into oper‐

ation after installing the air conditioner compressor and charg‐

ing the refrigerancircuivia the “Compressor run-in” function

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

anoil 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 FaulFinding” mode -

air conditioning system and battery regulation.

An electrically driven air conditioner compressor may only be

activated when the refrigerancircuiis charged. Running the

air conditioner compressor with the refrigerancircuiempty

could lead to compressor damage ⇒ Vehicle diagnostic tester

in “Guided FaulFinding” mode - air conditioning system and

battery regulation.

– To minimise the number of automatic engine starts when the

vehicle's drive system is active (READY) during tesand

measuremenwork, 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 .

– For tesand measuremenwork tharequires 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 thathey can‐

nocome into contacwith moving components of the engine

and so thathey cannoeven come near to components tha

turn when the engine is running.

2.8

Switching off air conditioner service sta‐

tion and separating from refrigerancir‐

cui

– Finish the requisite work with the air conditioner service sta‐

tion .

– Switch off ignition.

– Unscrew (close) the handwheels of both service couplings.

2. Working with air conditioner service station

151

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Air conditioning systems with refrigeranR1234yf - General information - Edition 07.2017

CAUTION

Risk of freezing injury caused by escaping pressurised refrig‐

erant.

There is a risk of injury to the skin and parts of the body due to

freezing.

– Wear protective gloves.

– Wear protective goggles.

– If, when loosening the handwheel of the service coupling,

refrigeranescapes from the refrigeranline for longer than

1 second, screw in the handwheel and renew the defective

valve.

– Extract refrigeranand open the refrigerancircuiimmedi‐

ately afterwards.

– If more than 10 minutes have passed since the refrigeran

was extracted, repeathe extraction process before opening

the refrigerancircuit. Pressure could build up in the refrig‐

erancircuifrom continued evaporation.

Differenversions of service couplings

♦ On one version of service coupling, the space between the

valve in the service connection of the refrigerancircuiand the

valve in the service coupling is vented externally when the

handwheel is unscrewed. On these service couplings, the

valve in the service connection of the vehicle is closed first,

followed by the valve in the service coupling for the charge

hose of air conditioner service station when the handwheel of

the service coupling is unscrewed. As iis unscrewed further,

the pressure still presenbetween the two valves is released

via an additional valve (approx. 2 cm of refrigerant). Should

one of these two valves (the valve in the service connection of

the vehicle or the valve in the service coupling for the charge

hose) noclose properly, the whole refrigerancould escape

ouof the refrigerancircuiof the vehicle or the charge hose.

♦ On another version of service coupling, the space between the

valve in the service connection of the refrigerancircuiand the

valve in the service coupling is novented externally when the

handwheel is unscrewed. This version features a valve thais

open when the service coupling is connected, which facilitates

pressure compensation between the space to the valve in the

service connection of the refrigerancircuiand the charge

hose connected to the service coupling. On this version, no

refrigeranescapes when the handwheel of the service cou‐

pling is unscrewed, which is why the refrigeranhas to be

extracted from the charge hoses into the air conditioner serv‐

ice station here before the service couplings are disconnected.

If a large amounof refrigeranis recovered here, for example,

after a pressure tesor after charging the refrigerancircui

(more than approx. 50 g), this is an indication thaa valve in

one of the service connections of the refrigerancircuicould

be leaking and refrigeranis escaping from the refrigerancir‐

cuiof the vehicle (extracrefrigeranand renew the defective

valve)

Before extracting the refrigeranfrom the charge hoses into the

air conditioner service station , unscrew the handwheels of both

service couplings as far as they will go.

152

Rep. gr.87 - Air conditioning system

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

Air conditioning systems with refrigeranR1234yf - General information - Edition 07.2017

Note

♦ Stored in the air conditioner service station is a function via

which iis switched to a specific operating mode when deac‐

tivated. The whole refrigeranis extracted from the charge

hoses into the air conditioner service station with this function.

♦ If the handwheels of the two service couplings are noun‐

screwed when this function is activated, refrigerancould be

extracted from the vehicle's refrigerancircuit.

– Extract the refrigeranfrom the two charge hoses using the air

conditioner service station as instructed in the relevanoper‐

ating manual ⇒ Operating instructions of air conditioner serv‐

ice station .

Note

♦ If, on an air conditioner service station with a service coupling

thadoes novento the outside, this process takes longer

than approx. 2 minutes or quite a large amounof refrigeran

is extracted, this suggests thathere is a faulin one of the

valves in a service connection.

♦ If, on an air conditioner service station with a service coupling

thadoes vento the outside, this process takes longer than

approx. 2 minutes, this suggests thathere is a faulin one of

the valves in a service coupling.

Note

Erroneous extraction from vehicle's refrigerancircuit.

– First unscrew (close) the handwheels of the quick-release

coupling adapters.

– Then extracthe refrigeranfrom the two charge hoses using

the air conditioner service station.

– Switch off the air conditioner service station (and isolate ifrom

the power supply if necessary) ⇒ Operating instructions air

conditioner service station .

– Separate the quick-release couplings from the service con‐

nections of the refrigerancircuit.

– Screw the sealing caps on the service connections (see vehi‐

cle-specific refrigerancircuit) ⇒ Heating, air conditioning;

Rep. gr. 87 ; Refrigerancircuit; System overview - refrigeran

circui.

2.9

Charging refrigeranin reservoir

– Connect the cylinder with fresh R1234yf refrigeranto the

service coupling on the high pressure side of the air condi‐

tioner service station ⇒ Operating instructions air conditioner

service station .

– Perform a gas analysis on the refrigeran(from the cylinder

supplied) with which the system is to be charged using the air

conditioner service station

⇒ “2.3 Performing gas analysis of refrigerant”, page 134 .

•

The procedure described in the operating manual for your air

conditioning service station is to be followed ⇒ Operating

manual for air conditioner service station .

2. Working with air conditioner service station

153

Air conditioning system Working with air conditioner service station -> 2.8 Switching off air conditioner service station and separating from refrigerant circuit for Your Volkswagen Sharan VAN Second Generation (2010-2023)

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