Get Air conditioning system Working with air conditioner service station -> 2.12 Cleaning 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

♦ On a new air conditioner com‐

pressor filled with more than

150 cm³, pour ouas much re‐

frigeranoil 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 refrigeranoil is poured

ouof a new air conditioner com‐

pressor into a clean container and

this is subsequently sealed air-tight,

the refrigeranoil can be re-used to

top-up the refrigeranoil volume in

the circuit.

6 - Refrigeranline

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

❑ Use a refrigeranline e.g. with parnumber 7L6 820 721 BF to set-up the flushing circui⇒ 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 se

8 - Charging hose of flushing device for refrigerancircuits

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

ameter) to inleof flushing device for refrigerancircuits.

9 - Flushing device for refrigerancircuits

❑ Different versions and differendesign of flushing devices for refrigerancircuits ⇒ Electronic parts cata‐

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

❑ With filter, sighglass, safety valve, heating, refrigerantank, etc. (depending on version).

❑ Depending on the layouof the air conditioner service station and the flushing device for refrigeran

circuits, there may be a service coupling for refrigerancircuits fitted athe outleand in some cases a

the inleof the flushing device. If a service connection with a valve is installed to the outleof the flushing

device, this valve musbe opened completely when the service coupling is connected. If the valve is no

opened completely, irestricts the refrigeranflow.

❑ If there is a connection for a service coupling fitted athe inleof the flushing device, the inlemusbe

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

Note

A service coupling and a valve in the

inleof the flushing device restric

the refrigeranflow from the vehicle

into the flushing device.

10 - Refrigeranhose of air conditioner service station

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

the flushing device for refrigerancircuits.

2.12

Cleaning refrigerancircui

– Perform preparatory measures for cleaning (flushing with

R1234yf refrigerant)

2. Working with air conditioner service station

157

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Air conditioning systems with refrigeranR1234yf - General information - Edition 07.2017

⇒ “1.6.2 Preparations for cleaning refrigerancircui(flushing

with R1234yf refrigerant)”, page 94

– Check the refrigeranvolume in the air conditioner service sta‐

tion . There musbe aleas6 kg of R1234yf refrigeran⇒

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 outleof the flushing de‐

vice for refrigerancircuits.

– Connect the inleof the flushing device for refrigerancircuits

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 circuidiagrams for various flushing circuits

⇒ “1.6 Cleaning refrigerancircuit”, 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 refrigeranR1234yf - General information - Edition 07.2017

Note

♦ The components are almosalways flushed againsthe direc‐

tion of refrigeranflow when the air conditioning system is in

operation. (Exception: electrically-actuated air conditioner

compressor) ⇒ page 92 .

♦ When flushing, contaminants from the refrigerancircuienter

the flushing device for refrigerancircuits and the air condi‐

tioner service station and are retained in the filters and dryers

installed within. Depending on the contamination, these com‐

ponents musbe renewed ashorter intervals than prescribed

as per the operating instructions of the air conditioner service

station or flushing device for refrigerancircuits ⇒ Operating

instructions of air conditioner service station .

♦ The filter in the flushing device for refrigerancircuits should

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

nation in the flushed refrigerancircuits) after abou5 to 10

flushing cycles (flushed vehicles). If a heavily contaminated

refrigerancircuiis flushed (the refrigeranoil from the refrig‐

erancircuiis black and viscous or there are large amounts

of swarf in the refrigerancircuit), renew the filter after flushing

this refrigerancircuit. After such heavy contamination of the

refrigerancircuit, iis a good idea to flush the system again

after replacing the filter.

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

eranoil and friction dusfrom the air conditioner compressor)

will gather in the sighglass of the rinsing device for refrigeran

circuits. If necessary, clean this sighglass after flushing and

flush the refrigerancircuithrough again to make sure iis

clean (one pass is sufficienin this instance).

♦ Liquid refrigerancannobe routed through the expansion

valve, restrictor and desiccanbag of certain receivers athe

necessary rate. Therefore remove these components and re‐

place them with adapters if applicable ⇒ page 92 and ⇒

Heating, air conditioning; Rep. gr. 87 ; Refrigerancircuit;

System overview - refrigerancircui(vehicle-specific work‐

shop manual).

♦ Adapters to connecair conditioner service station and to

bridge certain components of the refrigerancircui

⇒ “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 refrigerancircui(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

159

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Air conditioning systems with refrigeranR1234yf - General information - Edition 07.2017

Note

♦ Flushing procedure

⇒ “1.6.3 Refrigerancircuicleaning 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 abou125 cm ³of refrigeran

oil. If a system with a greater amounof refrigeranoil has to

be flushed, imay be necessary to empty the used oil tank after

the firsflushing process of a flushing cycle.

♦ Observe the refrigeranflowing back into the air conditioning

service station from the refrigerancircuit. Once the refrigeran

flows clear and completely colourless through the inspection

window of the flushing device for refrigerancircuits in the air

conditioning service station , the refrigerancircuiis cleaned.

♦ When flushing, the whole amounof refrigeranoil from the

refrigerancircuiis washed ou(excepfor a very small

amount, e.g. in the evaporator, buthis is negligible).

♦ Where contamination is particularly high, imay be necessary

to carry outhe 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 refrigerancircuits.

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

refrigerancircuits 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 refrigerancircuit. There musbe no

overpressure in the refrigerancircui(evacuate twice briefly if

necessary).

– Remove the connections to the air conditioning service station

from the refrigerancircuiof the vehicle (there should be no

overpressure in the refrigerancircuit)

– 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‐

ancircuit; System overview - refrigerancircui(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 ; Refrigeran

circuit; System overview - refrigerancircui(vehicle-specific

workshop manual) and ⇒ Electronic parts catalogue or drain

the remaining refrigeranoil from the removed air conditioner

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

with the requisite amounof fresh refrigeranoil again ⇒ Heat‐

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

specific workshop manual) and ⇒ Heating, air conditioning;

Rep. gr. 00 ; Technical data; Refrigeranoil .

160

Rep. gr.87 - Air conditioning system

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Air conditioning systems with refrigeranR1234yf - General information - Edition 07.2017

Note

♦ Replacemencompressors c_lo_kntain a certain specified quantity

of refrigeranoil. On vehicles with two evaporators, a certain

amounof refrigeranoil may also have to be filled in the circui

if necessary ⇒ Heating, air conditioning; Rep. gr. 00 ; Tech‐

nical data; Refrigeranoil .

♦ If the air conditioner compressor does noneed to be renewed,

replenish the refrigeranoil accordingly up to the prescribed fill

level (empty or flush refrigeranoil and pour the prescribed

volume back into the air conditioner compressor or refrigeran

circuit) ⇒ “1.5 Renewing components”, page 79 and ⇒ Heat‐

ing, air conditioning; Rep. gr. 00 ; Technical data; refrigeran

oil .

– Completely reassemble the refrigerancircuiagain ⇒ Heat‐

ing, air conditioning; Rep. gr. 87 ; Refrigerancircuit; System

overview - refrigerancircui(vehicle-specific workshop man‐

ual).

– Evacuate and charge the refrigerancircuiin accordance with

the specifications

⇒ “2.5 Evacuating refrigerancircuit”, page 140 ,

⇒ “2.6 Charging refrigerancircuit”, page 146 and ⇒ Heating,

air conditioning; Rep. gr. 00 ; Technical data .

– Bring the air conditioning system into operation in the prescri‐

bed manner ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrig‐

erancircuit; Bringing air conditioning system into operation

after charging refrigerancircui(vehicle-specific workshop

manual) and

⇒ “2.7 Bringing air conditioning system into service after

charging”, page 149

2.13

Filling contaminated refrigeranin a re‐

cycling cylinder for analysis, processing

or disposal

⇒ “2.13.1 Filling contaminated refrigeranin a recycling cylinder

using technical equipment”, page 161

⇒ “2.13.2 Filling undercooled contaminated refrigeranin a recy‐

cling cylinder”, page 164

2.13.1

Filling contaminated refrigeranin a re‐

cycling cylinder using technical equip‐

men

Note

♦ Some manufacturers may provide accessory devices (extract‐

ing or disposal units) thathey claim to be approved for the

extraction of gases of unknown composition. These devices,

however, have nobeen tested or approved by Volkswagen

so thawe cannodraw any conclusions aboutheir operation

or suitability.

♦ In order to be filled into an evacuated recycling cylinder withou

any auxiliary equipment, the contaminated refrigeranmusbe

supercooled. The corresponding procedure has been ap‐

proved by Volkswagen and described accordingly

⇒ page 164 .

2. Working with air conditioner service station

161

Air conditioning system Working with air conditioner service station -> 2.12 Cleaning refrigerant circuit for Your Volkswagen Sharan VAN Second Generation (2010-2023)

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