Get Air conditioning system -> 2.7 Bringing air conditioning system into service after charging 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

♦ A larger leak in the refrigerant circuit can be detected, for ex‐

ample, by pressurising the circuit to a maximum of 15 bar using

cleaned and dried compressed air or nitrogen ⇒ page 124 . If

the leak is large enough, the leakage point can be detected by

sound as the gas escapes.

♦ The compressed air or nitrogen is introduced to the closed,

empty refrigerant circuit via the service connection -B- to which

through a quick-release coupling adapter -A- has been con‐

nected.

♦ Screw the handwheel -C- into the quick-release coupling

adapter -A- until the valve in the service connection -B- is

completely open - do not over tighten the valve.

♦ The quick-release coupling adapter for service connection can

be fitted e.g. with a modified charging hose -A- (for example

with a M12 x 1.5-6G thread in accordance with SAE J639)

depending on the thread of the quick-release coupling adapter

and a suitable adapter -B- to connect to the workshop com‐

pressed air system ⇒ page 259 . To ensure that no moisture,

oil and dirt from the workshop compressed air system enter

the refrigerant circuit of the air conditioning system, use e.g. a

combination fine filter unit for compressed air systems with an

oil, dirt and water separator, which is commonly used in paint

spraying facilities. Install this between the compressed air sys‐

tem and the charge hose -A- ⇒ Electronic parts catalogue .

♦ Using the manifold gauge with pressure reducer for nitrogen

(maximum reduced pressure: 15 bar) -1- you can connect a

full nitrogen gas cylinder -3- via a charge hose -2- (e.g. with

M12 x 1.5-6G thread in accordance with SAE J639) to the

service connection - to which a quick-release coupling adapter

is connected - of a closed, empty refrigerant circuit

⇒ page 258 .

– Slowly increase the pressure in the refrigerant circuit to a max‐

imum of 15 bar.

CAUTION

Risk of injury from nitrogen escaping under high pressure.

– Use pressure limiter for nitrogen tank.

– Search for the leak by sound, which can be heard as gas es‐

capes from this point.

– Repair the leak.

– Evacuate refrigerant circuit and observe the vacuum gauge

over a period of hours. Only when a vacuum is maintained can

charging commence.

♦ If a leak is present of a size where no or very little air is drawn

in - with the refrigerant circuit evacuated - and the air condi‐

tioner service station can create sufficient vacuum. The vac‐

uum gauge does not increase or increases very slowly after

switching the air conditioner service station off. This indicates

that there may be a very small ingress of air and the vacuum

is lost.

2. Working with air conditioner service station

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

– Charge the circuit with 100 g of refrigerant and search for the

possible leak using an electronic leak tester

⇒ “1.4.2 Searching for leaks in refrigerant circuits using an

electronic leak detector”, page 69 or add an approved UV

contrast substance to the refrigerant and search for the pos‐

sible leak in the circuit using the leak detector system

⇒ “1.4.3 Searching for leaks with UV leak detection system”,

page 71 .

– Evacuate refrigerant circuit if necessary

⇒ “2.4 Emptying refrigerant circuit”, page 137

– Rectify the problem in the refrigerant circuit ⇒ Heating, air

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

workshop manual).

– Evacuate the refrigerant circuit and observe the vacuum

gauge over an extended period. Only when a vacuum is main‐

tained can charging commence

⇒ “2.5 Evacuating refrigerant circuit”, page 140 .

If it is necessary after evacuating to perform work on the vehicle

for which the air conditioner service station is not required:

– Detach the air conditioner service station from the refrigerant

circuit and switch off

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

rating from refrigerant circuit”, page 151 .

NOTICE

Risk of damage to air conditioner compressor with negative

pressure in the refrigerant circuit.

– Never start the engine if there is negative pressure in the

refrigerant circuit.

– Ensure that, until the refrigerant circuit is charged, the engine

cannot be started.

If after emptying and evacuating the refrigerant circuit is to be

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

2.6

Charging refrigerant circuit

Note

♦ The whole amount of refrigerant can be charged either on the

high pressure side or the low pressure side. Charging of the

refrigerant circuit is described as follows for the high pressure

side.

♦ Fill capacities of refrigerant and refrigerant oil ⇒ Heating, air

conditioning; Rep. gr. 00 ; Technical data .

•

The procedure described in the instruction manual for the air

conditioning service station is to be followed ⇒ Operating in‐

structions of air conditioner service station .

Before charging the system with refrigerant, the amount of re‐

frigerant oil must be adjusted ⇒ Heating, air conditioning; Rep.

gr. 00 ; Technical data .

Ensure when charging the refrigerant circuit that the air con‐

ditioner service station is at the same level as the vehicle

whose refrigerant circuit is to be charged (no greater than 50

cm difference). If the height difference is too great, deviations

may occur between the amount of refrigerant displayed and

the amount actually charged (depending on the version of air

146

Rep. gr.87 - Air conditioning system

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

conditioner service station ). The filling accuracy of the air

conditioner service station may be affected.

•

The refrigerant circuit is completely assembled ⇒ Heating, air

conditioning; Rep. gr. 87 ; Refrigerant circuit; System over‐

view - refrigerant circuit .

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

conditioning function (deactivate) ⇒ Owner's Manual .

– Switch off ignition.

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

ply.

– Check the volume of refrigerant, the volume of refrigerant oil

and the amount of UV leak detection additive in the air condi‐

tioner service station and replenish as necessary ⇒ Operating

instructions air conditioner service station .

In addition for vehicles with electrically-actuated valves in the re‐

frigerant circuit that are not open when de-energised:

Note

On vehicles with high-voltage system and auxiliary air condition‐

ing system functions (“heat pump mode” or “cooling of high-

voltage battery”), valves may be installed in the refrigerant circuit

that are not open when de-energised. These valves are opened

and closed e.g. via incremental motors and are no longer actu‐

ated when the ignition is switched off. To empty the refrigerant

circuit completely or to evacuate and charge it correctly, however,

no areas must be isolated. Therefore, these valves must be

opened before performing these types of work ⇒ Heating, air

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

workshop manual) and ⇒ Vehicle diagnostic tester in “Guided

Fault Finding” mode.

– Use the vehicle diagnostic tester to open the electrically-ac‐

tuated valves that are not open when de-energised ⇒ Vehicle

diagnostic tester in “Guided Fault Finding” mode.

All vehicles

– Bring the air conditioner service station into operation as de‐

scribed in the instructions ⇒ Operating instructions air condi‐

tioner service station .

– Unscrew the sealing caps from the service connections of the

refrigerant circuit (see vehicle-specific refrigerant circuit) ⇒

Heating, air conditioning system; Rep. gr. 87 ; Refrigerant cir‐

cuit (vehicle-specific workshop manual).

– Connect quick-release couplings to the service connections of

the refrigerant circuit

⇒ “2.2 Connecting air conditioner service station to refrigerant

circuit”, page 131 .

– Evacuate the refrigerant circuit with the air conditioner service

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

– Adjust the requisite amount of refrigerant, the amount of re‐

frigerant oil to be replenished if necessary and the amount of

UV leak detection additive in the air conditioner service station

⇒ Operating instructions air conditioner service station , ⇒

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

specific workshop manual).

– Choose the relevant setting on the air conditioner service sta‐

tion for charging on the high pressure side ⇒ Operating

instructions air conditioner service station .

2. Working with air conditioner service station

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Air conditioning system -> 2.7 Bringing air conditioning system into service after charging for Your Volkswagen Touran 4 Door Second Generation (2015-2022)

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