Get Air conditioning system -> 2.14.1 General information on checking pressures in the refrigerant circuit Guide for Volkswagen Touran 4 Door Second Generation (2015-2022)

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

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

Note

♦ Sealed recycling cylinders from your gas supplier usually

come pre-evacuated.

♦ Should the recycling cylinder not be evacuated, evacuate it as

necessary using a vacuum pump or an air conditioner service

station .

♦ Recycling cylinders are clearly marked as such and, unlike

refrigerant cylinders, do not have a non-return valve thereby

making them suitable for filling.

♦ Recycling cylinders are designed for international use, which

is why the “O” on the handwheel means “Open” (cylinder valve

= open) and not “0” (zero = closed).

♦ If an absolute pressure greater than 100 mbar but less than

900 mbar is measured in the recycling cylinder, evacuate the

recycling cylinder using a vacuum pump (or an air conditioner

service station ) (residual pressure less than 50 mbar)

⇒ “2.5 Evacuating refrigerant circuit”, page 140 .

♦ If an absolute pressure greater than 900 mbar is measured in

the recycling cylinder, this could be due to a number of rea‐

sons. The manual shut-off valve was opened and not closed

properly or the recycling cylinder had previously been used to

store refrigerant and then was not evacuated properly

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

(evacuate recycling cylinder). The recycling cylinder is leaking

(return the recycling cylinder to the supplier).

– Connect a vacuum metre (or air conditioner service station )

to the recycling cylinder.

– Carefully open the manual shut-off valve of the recycling cyl‐

inder to check the vacuum and then check the vacuum in the

cylinder.

– If necessary, evacuate the recycling cylinder with the air con‐

ditioner service station .

Note

♦ Should there be any air trapped in the recycling cylinder, it can

be evacuated using an air conditioner service station for

R1234yf. To do this, unscrew the low pressure service cou‐

pling from the charge hose of the air conditioner service station

and connect the charge hose directly to the recycling cylinder

adapter for the extraction device (for R1234yf refrigerant) - dry

ice box .

♦ If air is trapped in the recycling cylinder and there is no air

conditioner service station for R1234yf available, the recycling

cylinder can also be evacuated with an air conditioner service

station for R134a using a relevant flushing container and

adapter -VAS 6338/38- along with the charge hose from ex‐

traction device (for R1234yf refrigerant) - dry ice box .

•

Residual pressure in the recycling cylinder less than 10 mbar

absolute pressure.

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Rep. gr.87 - Air conditioning system

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

Note

♦ Recycling cylinders are pre-evacuated by the supplier, though

it is not always possible to ensure that the vacuum will remain

intact in storage.

♦ To reliably determine the type and scope of the contamination

of the refilled refrigerant during analysis of the contaminated

refrigerant, the recycling cylinder must be evacuated before

refilling to a residual pressure less than 50 mbar.

– Switch off ignition.

– Ensure that the workplace is well ventilated. Switch on addi‐

tional workshop extraction systems if fitted.

– Connect the charge hose with a suitable adapter to the evac‐

uated recycling cylinder.

CAUTION

Risk of explosion from overfilling refrigerant reservoirs.

Refrigerant can expand and cause reservoirs to burst if they are

overfilled.

– Use a refrigerant tank with safety valve.

– Never exceed the permissible fill level of the refrigerant tank.

Note

♦ Since contaminated refrigerant is only filled into a recycling

cylinder from a vehicle in the following work routine, there is

no danger of a recycling cylinder being overfilled with a fill vol‐

ume exceeding 3.0 kg.

♦ If contaminated refrigerant is filled into a recycling cylinder e.g.

from an air conditioner service station , measures must be

taken to ensure that the recycling cylinder is not overfilled due

to the larger volume. Use a recycling cylinder with an appro‐

priate permissible fill capacity and when refilling ensure by

means of weighing that the maximum permissible fill volume

is not exceeded.

CAUTION

Chemical reactions from contaminated refrigerant. Mixing

gases of unknown composition can cause different chemical

reactions.

Risk of injuries.

– Never mix together refrigerants of different origins.

2. Working with air conditioner service station

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

– Connect the service coupling for R1234yf refrigerant -5- to the

charge hose -4-.

– Connect the charge hose -4- with cylinder adapter -3- (and

seal -2-) to the recycling cylinder -1-.

– Place the spacer -6- in the insulated container -7-.

– Cover the base of the insulated container -7- with dry ice.

– Place the recycling cylinder -1- in the insulated container -7-

extraction device (for R1234yf refrigerant) - dry ice box .

– Pour the remainder of the dry ice in the insulated container

-7-.

– Cool down the recycling container -1- with dry ice (for approx.

15 minutes).

– Connect the recycling cylinder -1- via the service coupling

-5- to the connection of the air conditioner service station (or

the vehicle's refrigerant circuit).

– Open the manual shut-off valve of the recycling cylinder -1-.

Note

Recycling cylinders are designed for international use, which is

why the “O” on the handwheel means “Open” (cylinder valve =

open) and not “0” (zero = closed).

– Connect a pressure gauge to the refrigerant circuit (or use the

pressure gauge of the air conditioner service station ) and

check the pressure in the refrigerant circuit.

– Carefully open the service coupling -5- on the charge hose for

the recycling cylinder and allow the refrigerant to flow out

slowly into the recycling cylinder -1-.

– Wait until the refrigerant in the recycling cylinder -1- has liq‐

uefied (watch the display on the connected pressure gauge).

Note

♦ You can use your own pressure gauge or the pressure gauge

of the air conditioner service station to monitor the extraction

process.

♦ As soon as the displayed pressure is less than 0.3 bar after

approx. 60 minutes, it is safe to assume that the whole refrig‐

erant in the recycling cylinder is liquefied.

♦ Complete evaporation of the contaminated refrigerant from the

refrigerant circuit takes some time. After 60 minutes, it is safe

to assume that the whole refrigerant has evaporated.

– Close the service coupling -5- and manual shut-off valve of the

recycling cylinder -1-.

– Remove the charge hose -4- and cylinder connecting piece

-3- from the recycling cylinder -1- and close the recycling cyl‐

inder with the cap.

– The paperwork required for analysis, processing (or disposal)

of contaminated refrigerant must be filled in completely (dis‐

posal record, acceptance certificate etc.).

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

Note

♦ All of the information and documents for analysis, processing

(or disposal) can be obtained from your gas processing / gas

disposal company.

♦ Included with the recycling cylinder is a form. Kindly fill this in

accordingly and attach it to the recycling cylinder.

♦ If it is not possible to weigh the recycling cylinder before and

after filling with contaminated refrigerant, the fill volume speci‐

fied for the vehicle in question can be quoted as the amount

of refrigerant that was filled in the recycling cylinder. This is

permissible as only the amount of refrigerant from a vehicle is

filled in a recycling cylinder.

– Move the insulated box -7- with recycling cylinder -1- and dry

ice to a secure, well ventilated area outside the building.

– Open the lid of the insulated box -7- or remove and allow the

dry ice to evaporate.

Note

Do not take the recycling cylinder -1- out of the insulated container

-7- until the dry ice has evaporated and the recycling cylinder has

adjusted to ambient temperature.

– Remove the recycling cylinder -1- from the insulated container

-7-.

– Take the recycling cylinder -1- to a suitable location for storage

until it is ready to be collected by the gas processing / gas

disposal company.

– Evacuate the refrigerant circuit with the air conditioner service

station for at least 1 hour

⇒ “2.5 Evacuating refrigerant circuit”, page 140 .

Note

♦ Subsequent evacuation results in the last remnants of conta‐

minated refrigerant, which could still be in the refrigerant oil,

being removed at an absolute pressure of less than 10 mbar.

♦ The next steps depend on the complaint with the refrigerant

circuit

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

– Fill out the data sheet for the recycling cylinder (R-cylinder) if

the refrigerant is contaminated and firmly attach it to the recy‐

cling cylinder -1-.

Note

In the “Other comments” section, details can be provided regard‐

ing e.g. who is to receive the analysis results and in which way.

Example for recycling cylinder (R-cylinder) data sheet

2. Working with air conditioner service station

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Air conditioning system -> 2.14.1 General information on checking pressures in the refrigerant circuit for Your Volkswagen Touran 4 Door Second Generation (2015-2022)

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