Get Air conditioning system Working with air conditioner service station -> 2.2 Connecting air conditioner service station to 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

Note

♦ Contaminated refrigerancan change the way in which the air

conditioning system works and / or permanently damage com‐

ponents of the refrigerancircuit.

♦ Mixtures of differenrefrigerants (e.g. R1234yf refrigeranwith

an unknown quantity of R134a refrigerant) may nobe filled in

a vehicle thahas been given type approval for R1234yf re‐

frigerant.

Importaninstructions for working with air conditioner service sta‐

tion

To operate the air conditioner service station ( air conditioner

service station currently available ⇒ Workshop equipmenand

special tools catalogue ), the following musbe observed:

♦ The fitted filter and dryer musbe renewed athe lateswhen

the operational time specified in the related operating instruc‐

tions has been reached.

♦ If an air conditioner service station is also used to clean (flush)

the refrigerancircuit, the dryer and filter installed in the system

musbe replaced ashorter intervals ⇒ page 124 .

♦ Only refrigeranoils thaare approved for the vehicle-specific

refrigerancircuimay be filled in the reservoir (pour the re‐

frigeranoil directly into the refrigerancircuiif necessary) ⇒

Electronic parts catalogue .

♦ Depending on the version of air conditioner service station and

the measures to be performed, there is a minimum volume of

refrigerant, refrigeranoil and UV leak detection additive tha

musbe in the respective supply reservoirs of the air condi‐

tioner service station ⇒ Operating instructions air conditioner

service station

In the evenof any doubregarding the composition of the refrig‐

eranextracted from the refrigerancircuit, the extracted refriger‐

anmusnobe re-used even after ihas been cleaned in the air

conditioner service station

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

♦ If the wrong refrigeranhas been accidentally poured in the air

conditioner service station , imusbe emptied

⇒ “2.4 Emptying refrigerancircuit”, page 137 and

⇒ “2.2 Connecting air conditioner service station to refrigeran

circuit”, page 131 . The system may also need to be cleaned,

including renewal of the filters, dryers and refrigeranoil.

♦ Contaminated refrigerant, e.g. in Germany, can be returned to

the supplier in so-called recycling cylinders for analysis, pro‐

cessing or environmentally-compatible disposal (in other

countries, differenor additional regulations may apply)

⇒ “6.2.17 Returning contaminated R1234yf refrigeranfor

analysis, processing or disposal”, page 25 .

2.2

Connecting air conditioner service sta‐

tion to refrigerancircui

Connecting

•

Depending on the type of equipmenchosen, there may be

variations in the required procedure; therefore always follow

the user's manual for the equipmenbeing used.

2. Working with air conditioner service station

131

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Air conditioning systems with refrigeranR1234yf - General information - Edition 07.2017

Note

The procedure described in the instruction manual for your air

conditioning service station is to be followed ⇒ Operating instruc‐

tions air conditioner service station .

The charging hoses musonly be connected according to the fol‐

lowing work procedure to prevenair or moisture from entering

the refrigerancircuit:

– On vehicles with high-voltage system, switch off “stationary air

conditioning” function (deactivate)⇒ Owner's Manual and ⇒

Operating instructions of infotainmen/ MMI .

– Switch off ignition.

– Connect the air conditioner service station to the power sup‐

ply.

– Switch on the air conditioner service station and bring iinto

operation as described in the instructions ⇒ Operating in‐

structions air conditioner service station .

– Unscrew the sealing caps from the service connections (see

vehicle-specific refrigerancircuit) ⇒ Heating, air conditioning;

Rep. gr. 87 ; Refrigerancircui(vehicle-specific workshop

manual).

– Evacuate the charge hoses if necessary.

– Check service connections of refrigerancircuifor contami‐

nation or corrosion, clean if necessary.

Note

Diror a rough surface on the service connections caused by cor‐

rosion can cause damage to the seals and thereby premature

failure of the quick-release couplings.

– Fit quick-release couplings to the service connections of the

refrigerancircuit.

NOTICE

Risk of damage to the air conditioner compressor or air condi‐

tioner service station.

Opening the valves with the air conditioning system switched

on can cause a shorcircuibetween the high pressure and low

pressure side.

– Never open valves on the high pressure or low pressure side

with the air conditioning system switched on.

– Turn the handwheel of the quick-release coupling adapter on

the low pressure side no further than necessary to completely

open the service connection (observe pressure gauge; do no

over-tighten valve).

– Perform a gas analysis using the air conditioner service station

(only necessary if refrigeranneeds to be extracted or pres‐

sures in the refrigerancircuineed to be checked)

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

132

Rep. gr.87 - Air conditioning system

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Air conditioning systems with refrigeranR1234yf - General information - Edition 07.2017

Note

Connecthe gas analysis device or air conditioner service station

to the refrigerancircuias instructed to do so, and bring iinto

operation ⇒ Operating instructions of gas analysis device ,

⇒ page 131 and / or ⇒ Operating instructions air conditioner

service station .

If during the gas analysis iis found thathe refrigeranin the cir‐

cuimeets the specifications:

– Turn the handwheel of the quick-release coupling adapter on

the high pressure side no further than necessary to completely

open the service connection (observe pressure gauge; do no

over-tighten valve).

– Perform the measures as required on the refrigerancircui

using the air conditioner service station .

Note

♦ If, during the gas analysis, iis found thathe R1234y refrig‐

eranis contaminated, extracthe refrigeranfrom the refrig‐

erancircuiand send iback e.g. to your gas supplier for

processing (or disposal)

⇒ “2.13 Filling contaminated refrigeranin a recycling cylinder

for analysis, processing or disposal”, page 161 ,

⇒ “6.2.17 Returning contaminated R1234yf refrigeranfor

analysis, processing or disposal”, page 25 and

⇒ “6.1 Basics of air conditioning technology”, page 16 .

♦ Should there be no means of doing this, extracthe contami‐

nated refrigeranimmediately from the refrigerancircuiof the

vehicle and collecin a recycling cylinder. Unscrew (close) the

handwheel of the quick release coupling adapter on the low

pressure side, switch off the air conditioner service station

(and isolate from the power supply if necessary). Then sepa‐

rate the quick release coupling adapter on the low pressure

side from the vehicle. The quick release coupling adapter on

the low pressure side musthen be separated - e.g. with a

suction hose from the workshop extraction uni- from the

charge hose for the air conditioner service station and the

contaminated refrigeranallowed to flow ouof the charge

hose into the extraction hose of the workshop extraction unit.

To restore operational readiness of the air conditioner service

station , reinstall the quick release coupling adapter on the low

pressure side on the charge hose for the air conditioner serv‐

ice station and evacuate using the air conditioner service

station as instructed to do so in the relevanoperating instruc‐

tions ⇒ Operating instructions air conditioner service station .

– Perform the measures as required using the air conditioner

service station .

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

♦ ⇒ “2.4 Emptying refrigerancircuit”, page 137 .

♦ ⇒ “2.5 Evacuating refrigerancircuit”, page 140 .

♦ ⇒ “2.6 Charging refrigerancircuit”, page 146 .

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

rating from refrigerancircuit”, page 151

♦ ⇒ “2.9 Charging refrigeranin reservoir”, page 153 .

♦ ⇒ “2.10 Emptying air conditioner service station”, page 154 .

2. Working with air conditioner service station

133

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Air conditioning systems with refrigeranR1234yf - General information - Edition 07.2017

♦ ⇒ “2.14 Checking pressures”, page 170

2.3

Performing gas analysis of refrigeran

Note

♦ For operation of the air conditioning system, iis importantha

the refrigeranused has a certain degree of purity.

♦ Contamination with other refrigerants or gases can cause

damage and thereby failure of the air conditioning system.

♦ Contaminated refrigeranmusbe returned as gas of unknown

composition e.g. to your gas supplier for processing (or dis‐

posal) in accordance with legislative requirements ⇒ VW /

Audi-ServiceNe.

♦ To prevenliquid components (e.g. droplets of refrigeranoil)

in the extracted refrigerangas from falsifying the resulof the

gas analysis, separators (filters) are installed in the gas anal‐

ysis device thaseparate these droplets of liquid. Renew

separators in accordance with specifications of gas analysis

device or operating instructions of air conditioner service sta‐

tion ⇒ Operating instructions of gas analysis device or ⇒

Operating instructions of air conditioner service station .

All vehicles

– Connect the gas analysis device or air conditioner service sta‐

tion to the refrigerancircuias instructed to do so, and bring

iinto operation ⇒ Operating instructions of gas analysis de‐

vice ,

⇒ “2.2 Connecting air conditioner service station to refrigeran

circuit”, page 131 and / or ⇒ Operating instructions air condi‐

tioner service station .

– Perform the gas analysis as per the operating instructions.

Note

♦ A faulty gas analysis is possible from air in the refrigeranho‐

ses or non-observance of the procedure for gas analysis as

detailed in the operating instructions.

♦ Carefully follow the operating instructions of the gas analysis

device / air conditioner service station .

♦ Evacuate refrigeranhoses of the air conditioner service sta‐

tion before connecting the service couplings to the refrigeran

circui/ gas cylinder with R1234yf refrigeranhose (see oper‐

ating instructions of gas analysis device / air conditioner serv‐

ice station

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

The gas analysis may provide the following results:

♦ The R1234yf refrigerancomplies with the specifications, the

planned measures may be performed with the air conditioner

service station .

♦ A fauloccurred during the gas analysis. The faulis to be in‐

vestigated and rectified after which the gas analysis musbe

repeated.

♦ The analysed R1234yf refrigerandoes nocomply with the

specifications, the analysed refrigeranmusbe extracted as

refrigeranof unknown composition and returned e.g. to your

gas supplier for processing (or disposal)

134

Rep. gr.87 - Air conditioning system

Air conditioning system Working with air conditioner service station -> 2.2 Connecting air conditioner service station to refrigerant circuit for Your Volkswagen Sharan VAN Second Generation (2010-2023)

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