Get Air conditioning system -> 1.2.19 Quick-release coupling connections in refrigerant circuit 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

1.2.19

Quick-release coupling connections in

refrigerant circuit

Service connections with Schrader valve (needle valve or push

pin)

♦ Only valves and connections resistant to R1234yf refrigerant

and the related refrigerant oils may be used.

♦ Service connections -C- and -F- in an R1234yf refrigerant cir‐

cuit are configured in such a way that service couplings cannot

be connected to service connections designed for an R134a

refrigerant circuit.

♦ Different connections (external diameter) for high pressure

and low pressure side -C- and -F-.

♦ Before removing the valves or valve inserts -B- and -E-, empty

the refrigerant circuit.

♦ Always screw on sealing caps -A- and -D- with seal -G-.

Layout in vehicle ⇒ Heating, air conditioning; Rep. gr. 87 ; Re‐

frigerant circuit (vehicle-specific workshop manual).

– Extract refrigerant before unscrewing the valves.

♦ Service connection, low pressure side -F-

♦ Service connection, high pressure side -C-

♦ Valve insert (designation: Schrader or needle valve)

♦ Sealing cap for service connection on low pressure side with

seal -A-

♦ Sealing cap for service connection on high pressure side with

seal -D-

1. Refrigerant circuit

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

Note

♦ Carefully, and no more than necessary, screw in the hand‐

wheel of the service coupling (after connecting) into the quick

release coupling adapter until the valve in the service connec‐

tion is open (observe pressure gauge; do not over-tighten

valve).

♦ Service connections in an R1234yf refrigerant circuit are con‐

figured in such a way that service couplings cannot be con‐

nected to service connections designed for an R134a

refrigerant circuit.

♦ The service connections are brazed into e.g. a refrigerant line

and therefore cannot be replaced individually.

♦ When removing and installing valve core with refrigerant cir‐

cuit discharged, use a socket - T10364- or similar.

♦ Exercise caution when tightening the valve insert due to the

low tightening torque.

♦ There are different versions of these valves; therefore tight‐

ening torques vary. For a valve insert -C- with a VG5 thread

(5.2 x 0.7 mm, tyre valve) the tightening torque is 0.4 Nm

± 0.1 Nm; for a valve insert with an M6 x 0.75 mm thread the

tightening torque is 0.9 Nm ± 0.1 Nm, and for a valve insert

with an M8 x 1.0 mm thread the tightening torque is

2.0 Nm ± 0.2 Nm.

♦ These valve caps come in different versions, which means that

the specified torques will differ. For a valve cap with an M8 x

1 mm or M10 x 1 mm thread, the specified torque is

0.4 Nm ± 0.1 Nm respectively.

♦ These valves, valve inserts and corresponding sealing caps

come in different versions. Make sure that the correct type of

valve insert is used and allocation of the sealing caps is correct

⇒ Electronic parts catalogue .

Dimensions of service connections

Rep. gr.87 - Air conditioning system

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

♦ Valve insert -A- (different versions).

♦ Service connection -B- (different versions on high pressure

and low pressure side depending on refrigerant)

Dimensions of serv‐ Service connec‐

Service connection

ice connections -B- tion for R134a re‐ for R1234yf refriger‐

frigerant

High-

ant

Low-

High-

Low-

pressure pres‐

pressure pressure

side

sure

side

External diameter

-D1-

16.0 mm 13.0 m 17.0 mm 14.0 mm

External diameter

14.0 mm 11.0 m 13.0 mm 12.0 mm

-D2-

Shoulder -L1-

Shoulder -L2-

4.6 mm 6.15 m 9.0 mm 4.75 mm

8.16 mm 9.16 m 12.5 mm 7.2 mm

Installation position of 6.1 - 7.1 6.1 - 7.1 8.3 - 9.3 8.3 - 9.3

valve (unactuated)

-C-

Service connections with primary sealing valve (ball valve)

♦ This type of service connection is currently not used in VW/

Audi refrigerant circuits.

♦ Only valves and connections resistant to R1234yf refrigerant

and the related refrigerant oils may be used.

♦ Service connections in an R1234yf refrigerant circuit are con‐

figured in such a way that service couplings cannot be con‐

nected to service connections designed for an R134a

refrigerant circuit.

♦ Different connections (external diameter) for high-pressure

and low-pressure sides.

♦ Discharge refrigerant circuit before removing valve or valve

inserts.

♦ Always screw on sealing caps with seal.

Layout in vehicle ⇒ Heating, air conditioning; Rep. gr. 87 ; Re‐

frigerant circuit (vehicle-specific workshop manual).

1. Refrigerant circuit

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

Connection with high pressure valve

1 - Boss with internal thread (brazed on)

2 - Seal (version and designation: black or coloured ⇒ Elec‐

tronic parts catalogue )

3 - Valve with external thread and groove for seal (designation:

ball valve)

4 - Seal for sealing cap

5 - Sealing cap

Note

♦ Carefully, and no more than necessary, screw in the hand‐

wheel of the service coupling (after connecting) into the quick

release coupling adapter until the valve in the service connec‐

tion is open (observe pressure gauge; do not over-tighten

valve).

♦ When removing and installing the valve -3- with purged refrig‐

erant circuit, use e.g. an adapter from socket set - T10364- .

♦ These valves come in different versions (with internal or ex‐

ternal thread) and the specified torques can therefore differ.

For the valves -3- currently in use (external thread M12 x 1.5

mm) the tightening torque is 9 Nm ± 1 Nm.

♦ These valves and corresponding sealing caps come in differ‐

ent versions. Make sure that the correct type of valve is used

and allocation of the sealing caps is correct ⇒ Electronic parts

catalogue .

Connection with low pressure valve

1 - Boss with external thread and groove for O-ring (brazed in)

2 - Seal (version and designation: black or coloured ⇒ Elec‐

tronic parts catalogue )

3 - Valve with internal thread

4 - Seal for sealing cap

5 - Sealing cap

Note

♦ Carefully, and no more than necessary, screw in the hand‐

wheel of the service coupling into the quick release coupling

adapter until the valve in the service connection is open (ob‐

serve pressure gauge; do not over-tighten valve).

♦ When removing and installing the valve -3- with purged refrig‐

erant circuit, use e.g. an adapter from socket set - T10364- .

♦ These valves come in different versions (with internal or ex‐

ternal thread) and the specified torques can therefore differ.

For the valves -3- currently in use (internal thread

M10 x 1.25 mm) the tightening torque is 9 Nm ± 1 Nm.

♦ These valves and corresponding sealing caps come in differ‐

ent versions. Make sure that the correct type of valve is used

and allocation of the sealing caps is correct ⇒ Electronic parts

catalogue .

Rep. gr.87 - Air conditioning system

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

1.2.20

Connections with valve for switches in

refrigerant circuit

Note

Refer to vehicle-specific refrigerant circuit for switching pres‐

sures, removing and installing switches and location/design of

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

circuit (vehicle-specific workshop manual).

•

The switches on the high pressure and low pressure sides

have different threads.

Only valves and seals resistant to R1234yf refrigerant and the

related refrigerant oils may be used ⇒ Electronic parts cata‐

logue .

A - Connection (brazed)

B - Seal

C - Valve (with seal)

Note

♦ To remove and install the valve -C- with the refrigerant circuit

empty, use e.g. an adapter from socket set - T10364- (speci‐

fied torque ⇒ page 55 ).

♦ There are different versions of these valves; therefore tight‐

ening torques vary. For a valve insert -C- with a VG5 thread

(5.2 x 0.7 mm, tyre valve) the tightening torque is 0.4 Nm

± 0.1 Nm; for a valve insert with an M6 x 0.75 mm thread the

tightening torque is 0.9 Nm ± 0.1 Nm, and for a valve insert

with an M8 x 1.0 mm thread the tightening torque is

2.0 Nm ± 0.2 Nm.

1.2.21

Pressure senders and switches in refrig‐

erant circuit

Note

♦ Pressure senders and switches come in different versions,

with different functions and different designations ⇒ Heating,

air conditioning; Rep. gr. 87 ; Refrigerant circuit (vehicle-spe‐

cific workshop manual).

♦ Switching pressures, removing and installing switches and

switch layout and type ⇒ Heating, air conditioning; Rep. gr.

87 ; Refrigerant circuit (vehicle-specific workshop manual).

1. Refrigerant circuit

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Air conditioning system -> 1.2.19 Quick-release coupling connections in refrigerant circuit for Your Volkswagen Touran 4 Door Second Generation (2015-2022)

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