Get Air conditioning system -> 2.13.1 Filling contaminated refrigerant in a recycling cylinder using technical equipment Guide for Volkswagen Touran 4 Door Second Generation (2015-2022)

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

♦ On a new air conditioner com‐

pressor filled with more than

150 cm³, pour out as much re‐

frigerant oil as possible before

flushing.

♦ Reason: The oil volume to be

displaced in one work step may

be restricted depending on the

version of air conditioner service

station .

Note

If the clean refrigerant oil is poured

out of a new air conditioner com‐

pressor into a clean container and

this is subsequently sealed air-tight,

the refrigerant oil can be re-used to

top-up the refrigerant oil volume in

the circuit.

6 - Refrigerant line

❑ For connection of air conditioner compressor to adapter ⇒ Item 7 (page 157)

❑ Use a refrigerant line e.g. with part number 7L6 820 721 BF to set-up the flushing circuit ⇒ Electronic

parts catalogue

7 - Adapter for connection on high pressure side of air conditioner compressor

❑ Different versions depending on vehicle ⇒ “1.6.8 Adapters for setting up flushing circuits”, page 105

❑ From adapter case VW/Audi passenger vehicle set

8 - Charging hose of flushing device for refrigerant circuits

❑ From connection to high pressure side of air conditioner compressor on refrigerant circuit (smaller di‐

ameter) to inlet of flushing device for refrigerant circuits.

9 - Flushing device for refrigerant circuits

❑ Different versions and different design of flushing devices for refrigerant circuits ⇒ Electronic parts cata‐

logue (Tools; Workshop equipment/tools; Air conditioning/heating)

❑ With filter, sight glass, safety valve, heating, refrigerant tank, etc. (depending on version).

❑ Depending on the layout of the air conditioner service station and the flushing device for refrigerant

circuits, there may be a service coupling for refrigerant circuits fitted at the outlet and in some cases at

the inlet of the flushing device. If a service connection with a valve is installed to the outlet of the flushing

device, this valve must be opened completely when the service coupling is connected. If the valve is not

opened completely, it restricts the refrigerant flow.

❑ If there is a connection for a service coupling fitted at the inlet of the flushing device, the inlet must be

adapted to allow for the refrigerant hose coming from the vehicle to be connected directly.

Note

A service coupling and a valve in the

inlet of the flushing device restrict

the refrigerant flow from the vehicle

into the flushing device.

10 - Refrigerant hose of air conditioner service station

❑ From the low pressure side of the air conditioner service station (normally coloured blue) to the outlet of

the flushing device for refrigerant circuits.

2.12

Cleaning refrigerant circuit

– Perform preparatory measures for cleaning (flushing with

R1234yf refrigerant)

2. Working with air conditioner service station

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

⇒ “1.6.2 Preparations for cleaning refrigerant circuit (flushing

with R1234yf refrigerant)”, page 94

– Check the refrigerant volume in the air conditioner service sta‐

tion . There must be at least 6 kg of R1234yf refrigerant ⇒

Operating instructions of air conditioner service station .

– Empty container for used oil of air conditioner service station

⇒ Operating instructions of air conditioner service station .

– Connect the supply hose (high pressure side) of the air con‐

ditioner service station with an adapter to the low pressure line

leading to the air conditioner compressor (line with larger di‐

ameter)

⇒ “1.6.8 Adapters for setting up flushing circuits”, page 105 .

– Connect the return hose (low pressure or suction side) of the

air conditioner service station to the outlet of the flushing de‐

vice for refrigerant circuits.

– Connect the inlet of the flushing device for refrigerant circuits

with an adapter to the high pressure line leading to the air

conditioner compressor (line with smaller diameter)

⇒ “1.6.8 Adapters for setting up flushing circuits”, page 105 .

♦ Principle circuit diagrams for various flushing circuits

⇒ “1.6 Cleaning refrigerant circuit”, page 92

♦ Adapters for setting up flushing circuits

⇒ “1.6.8 Adapters for setting up flushing circuits”, page 105

158

Rep. gr.87 - Air conditioning system

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

Note

♦ The components are almost always flushed against the direc‐

tion of refrigerant flow when the air conditioning system is in

operation. (Exception: electrically-actuated air conditioner

compressor) ⇒ page 92 .

♦ When flushing, contaminants from the refrigerant circuit enter

the flushing device for refrigerant circuits and the air condi‐

tioner service station and are retained in the filters and dryers

installed within. Depending on the contamination, these com‐

ponents must be renewed at shorter intervals than prescribed

as per the operating instructions of the air conditioner service

station or flushing device for refrigerant circuits ⇒ Operating

instructions of air conditioner service station .

♦ The filter in the flushing device for refrigerant circuits should

be changed (depending on the type and severity of contami‐

nation in the flushed refrigerant circuits) after about 5 to 10

flushing cycles (flushed vehicles). If a heavily contaminated

refrigerant circuit is flushed (the refrigerant oil from the refrig‐

erant circuit is black and viscous or there are large amounts

of swarf in the refrigerant circuit), renew the filter after flushing

this refrigerant circuit. After such heavy contamination of the

refrigerant circuit, it is a good idea to flush the system again

after replacing the filter.

♦ Depending on the type of contamination, deposits (old refrig‐

erant oil and friction dust from the air conditioner compressor)

will gather in the sight glass of the rinsing device for refrigerant

circuits. If necessary, clean this sight glass after flushing and

flush the refrigerant circuit through again to make sure it is

clean (one pass is sufficient in this instance).

♦ Liquid refrigerant cannot be routed through the expansion

valve, restrictor and desiccant bag of certain receivers at the

necessary rate. Therefore remove these components and re‐

place them with adapters if applicable ⇒ page 92 and ⇒

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

System overview - refrigerant circuit (vehicle-specific work‐

shop manual).

♦ Adapters to connect air conditioner service station and to

bridge certain components of the refrigerant circuit

⇒ “1.6.8 Adapters for setting up flushing circuits”, page 105 .

Perform flushing (the procedure runs automatically as per the

program in the air conditioner service station ⇒ Operating in‐

structions of air conditioner service station )

– Switch on the air conditioner service station ⇒ Operating in‐

structions of air conditioner service station .

– Select the flushing program on the air conditioner service sta‐

tion ⇒ Operating instructions of air conditioner service station .

– Flush the refrigerant circuit (duration approx. 1 to 1.5 hours for

one flushing cycle with 4 cycles) ⇒ Operating instructions of

air conditioner service station .

2. Working with air conditioner service station

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

Note

♦ Flushing procedure

⇒ “1.6.3 Refrigerant circuit cleaning procedure”, page 96 .

♦ Perform flushing as instructed in the operating manual of the

air conditioning service station ⇒ Operating instructions of air

conditioner service station .

♦ Depending on the type of air conditioning service station , the

used oil tank has a capacity of about 125 cm ³of refrigerant

oil. If a system with a greater amount of refrigerant oil has to

be flushed, it may be necessary to empty the used oil tank after

the first flushing process of a flushing cycle.

♦ Observe the refrigerant flowing back into the air conditioning

service station from the refrigerant circuit. Once the refrigerant

flows clear and completely colourless through the inspection

window of the flushing device for refrigerant circuits in the air

conditioning service station , the refrigerant circuit is cleaned.

♦ When flushing, the whole amount of refrigerant oil from the

refrigerant circuit is washed out (except for a very small

amount, e.g. in the evaporator, but this is negligible).

♦ Where contamination is particularly high, it may be necessary

to carry out the flushing process twice (two flushing cycles with

4 flushing processes each).

– At the end of the flushing process, check the inspection win‐

dow or windows of the flushing device for refrigerant circuits.

If dirty, clean as per the instructions of the flushing device for

refrigerant circuits or air conditioner service station and per‐

form the flushing process again ^lt^ko be safe (running through

once over a period of approx. 30 min. is sufficient) ⇒ Operating

instructions air conditioner service station .

– Check the pressure in the refrigerant circuit. There must be no

overpressure in the refrigerant circuit (evacuate twice briefly if

necessary).

– Remove the connections to the air conditioning service station

from the refrigerant circuit of the vehicle (there should be no

overpressure in the refrigerant circuit)

– Renew these vehicle-specific components (restrictor and res‐

ervoir, expansion valve and receiver / dryer cartridge in the

reservoir) ⇒ Heating, air conditioning; Rep. gr. 87 ; Refriger‐

ant circuit; System overview - refrigerant circuit (vehicle-spe‐

cific workshop manual) and ⇒ Electronic parts catalogue .

– Depending on the complaint, renew the air conditioner com‐

pressor ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigerant

circuit; System overview - refrigerant circuit (vehicle-specific

workshop manual) and ⇒ Electronic parts catalogue or drain

the remaining refrigerant oil from the removed air conditioner

compressor ⇒ “1.5 Renewing components”, page 79 and fill

with the requisite amount of fresh refrigerant oil again ⇒ Heat‐

ing, air conditioning; Rep. gr. 00 ; Technical data (vehicle-

specific workshop manual) and ⇒ Heating, air conditioning;

Rep. gr. 00 ; Technical data; Refrigerant oil .

160

Rep. gr.87 - Air conditioning system

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Air conditioning system -> 2.13.1 Filling contaminated refrigerant in a recycling cylinder using technical equipment for Your Volkswagen Touran 4 Door Second Generation (2015-2022)

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