Get Air conditioning system -> 2.2 Connecting air conditioner service station to refrigerant circuit Guide for Volkswagen Cc 4 Door Second Generation (2012-2017)

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

Note

♦ Contaminated refrigerant can change the way in which the air

conditioning system works and / or permanently damage com‐

ponents of the refrigerant circuit.

♦ Mixtures of different refrigerants (e.g. R1234yf refrigerant with

an unknown quantity of R134a refrigerant) may not be filled in

a vehicle that has been given type approval for R1234yf re‐

frigerant.

Important instructions for working with air conditioner service sta‐

tion

To operate the air conditioner service station ( air conditioner

service station currently available ⇒ Workshop equipment and

special tools catalogue ), the following must be observed:

♦ The fitted filter and dryer must be renewed at the latest when

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 refrigerant circuit, the dryer and filter installed in the system

must be replaced at shorter intervals ⇒ page 124 .

♦ Only refrigerant oils that are approved for the vehicle-specific

refrigerant circuit may be filled in the reservoir (pour the re‐

frigerant oil directly into the refrigerant circuit if 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, refrigerant oil and UV leak detection additive that

must be in the respective supply reservoirs of the air condi‐

tioner service station ⇒ Operating instructions air conditioner

service station

In the event of any doubt regarding the composition of the refrig‐

erant extracted from the refrigerant circuit, the extracted refriger‐

ant must not be re-used even after it has been cleaned in the air

conditioner service station

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

♦ If the wrong refrigerant has been accidentally poured in the air

conditioner service station , it must be emptied

⇒ “2.4 Emptying refrigerant circuit”, page 137 and

⇒ “2.2 Connecting air conditioner service station to refrigerant

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

including renewal of the filters, dryers and refrigerant oil.

♦ 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, different or additional regulations may apply)

⇒ “6.2.17 Returning contaminated R1234yf refrigerant for

analysis, processing or disposal”, page 25 .

2.2

Connecting air conditioner service sta‐

tion to refrigerant circuit

Connecting

•

Depending on the type of equipment chosen, there may be

variations in the required procedure; therefore always follow

the user's manual for the equipment being used.

2. Working with air conditioner service station

131

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Air conditioning systems with refrigerant R1234yf - 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 must only be connected according to the fol‐

lowing work procedure to prevent air or moisture from entering

the refrigerant circuit:

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

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

Operating instructions of infotainment / MMI .

– Switch off ignition.

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

ply.

– Switch on the air conditioner service station and bring it into

operation as described in the instructions ⇒ Operating in‐

structions air conditioner service station .

– Unscrew the sealing caps from the service connections (see

vehicle-specific refrigerant circuit) ⇒ Heating, air conditioning;

Rep. gr. 87 ; Refrigerant circuit (vehicle-specific workshop

manual).

– Evacuate the charge hoses if necessary.

– Check service connections of refrigerant circuit for contami‐

nation or corrosion, clean if necessary.

Note

Dirt or 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

refrigerant circuit.

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 short circuit between 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 not

over-tighten valve).

– Perform a gas analysis using the air conditioner service station

(only necessary if refrigerant needs to be extracted or pres‐

sures in the refrigerant circuit need 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 refrigerant R1234yf - General information - Edition 07.2017

Note

Connect the gas analysis device or air conditioner service station

to the refrigerant circuit as instructed to do so, and bring it into

operation ⇒ Operating instructions of gas analysis device ,

⇒ page 131 and / or ⇒ Operating instructions air conditioner

service station .

If during the gas analysis it is found that the refrigerant in the cir‐

cuit meets 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 not

over-tighten valve).

– Perform the measures as required on the refrigerant circuit

using the air conditioner service station .

Note

♦ If, during the gas analysis, it is found that the R1234y refrig‐

erant is contaminated, extract the refrigerant from the refrig‐

erant circuit and send it back e.g. to your gas supplier for

processing (or disposal)

⇒ “2.13 Filling contaminated refrigerant in a recycling cylinder

for analysis, processing or disposal”, page 161 ,

⇒ “6.2.17 Returning contaminated R1234yf refrigerant for

analysis, processing or disposal”, page 25 and

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

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

nated refrigerant immediately from the refrigerant circuit of the

vehicle and collect in 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 must then be separated - e.g. with a

suction hose from the workshop extraction unit - from the

charge hose for the air conditioner service station and the

contaminated refrigerant allowed to flow out of 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 relevant operating 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 refrigerant circuit”, page 137 .

♦ ⇒ “2.5 Evacuating refrigerant circuit”, page 140 .

♦ ⇒ “2.6 Charging refrigerant circuit”, page 146 .

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

rating from refrigerant circuit”, page 151

♦ ⇒ “2.9 Charging refrigerant in 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 refrigerant R1234yf - General information - Edition 07.2017

♦ ⇒ “2.14 Checking pressures”, page 170

2.3

Performing gas analysis of refrigerant

Note

♦ For operation of the air conditioning system, it is important that

the refrigerant used has a certain degree of purity.

♦ Contamination with other refrigerants or gases can cause

damage and thereby failure of the air conditioning system.

♦ Contaminated refrigerant must be returned as gas of unknown

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

posal) in accordance with legislative requirements ⇒ VW /

Audi-ServiceNet .

♦ To prevent liquid components (e.g. droplets of refrigerant oil)

in the extracted refrigerant gas from falsifying the result of the

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

ysis device that separate 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 refrigerant circuit as instructed to do so, and bring

it into operation ⇒ Operating instructions of gas analysis de‐

vice ,

⇒ “2.2 Connecting air conditioner service station to refrigerant

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 refrigerant ho‐

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 refrigerant hoses of the air conditioner service sta‐

tion before connecting the service couplings to the refrigerant

circuit / gas cylinder with R1234yf refrigerant hose (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 refrigerant complies with the specifications, the

planned measures may be performed with the air conditioner

service station .

♦ A fault occurred during the gas analysis. The fault is to be in‐

vestigated and rectified after which the gas analysis must be

repeated.

♦ The analysed R1234yf refrigerant does not comply with the

specifications, the analysed refrigerant must be extracted as

refrigerant of unknown composition and returned e.g. to your

gas supplier for processing (or disposal)

134

Rep. gr.87 - Air conditioning system

Air conditioning system -> 2.2 Connecting air conditioner service station to refrigerant circuit for Your Volkswagen Cc 4 Door Second Generation (2012-2017)

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