Get Air conditioning system -> 1.2.2 Mechanical air conditioner compressor 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

1.2.2

Mechanical air conditioner compressor

The air conditioner compressor is driven by a poly V-belt -B- or a

shaft by the engine.

Air conditioner compressor with air conditioning system magnetic

clutch - N25- :

An electromagnetic clutch -A- attached to the air conditioner com‐

pressor provides power transfer between pulley -B- and com‐

pressor crankshaft when the air conditioning is switched on.

An overload protection device attached to the clutch plate or fitted

in the solenoid of the air conditioner compressor triggers if there

is resistance in the air conditioner compressor (sluggish move‐

ment), protecting the belt drive or the drive unit against overload.

Note

♦ To ensure that the air conditioner compressor is not damaged

if the refrigerant circuit is empty, the air conditioner compres‐

sor regulating valve - N280- and, under certain circumstances,

the air conditioning system magnetic clutch - N25- are no lon‐

ger actuated (the air conditioner compressor only runs at idle

with the engine if -N25- is actuated).

♦ An air conditioner compressor with -N25- (without -N280- ) is

not actuated if the refrigerant circuit is empty and is therefore

not driven.

Air conditioner compressor without air conditioning system mag‐

netic clutch - N25- :

♦ An overload protection device attached to the pulley -B- or fit‐

ted in the drive unit of the air conditioner compressor triggers

if there is resistance in the air conditioner compressor (slug‐

gish movement), protecting the belt drive or the drive unit

against overload.

♦ An air conditioner compressor with air conditioner compressor

regulating valve - N280- (without -N25- ) is switched over to

internal lubrication via a valve if the refrigerant circuit is empty.

Note

♦ On air conditioner compressors without air conditioning sys‐

tem magnetic clutch - N25- , the engine may only be started

following complete assembly of the refrigerant circuit.

♦ To ensure that the air conditioner compressor suffers no dam‐

age if the refrigerant circuit is empty, the air conditioner com‐

pressor regulating valve - N280- is no longer activated (the air

conditioner compressor idles with the engine).

All air conditioner compressors

The air conditioner compressor draws refrigerant gas from the

evaporator, compresses it and sends it to the condenser.

Rep. gr.87 - Air conditioning system

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

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

Note

♦ The air conditioner compressor contains refrigerant oil, which

can be mixed with R1234yf refrigerant at any temperature.

♦ The identification plate states the refrigerant for which the air

conditioner compressor is suitable. A valve regulates the pres‐

sure on the low-pressure side within the specified range (con‐

trol characteristic) ⇒ Heating, air conditioning system; Rep.

gr. 87 ; Refrigerant circuit .

♦ Depending on the version of air conditioner compressor, dif‐

ferent refrigerant oils are filled in the air conditioner compres‐

sor. Refrigerant oils that were developed for R134a refrigerant

oil only, must not be used for R1234yf refrigerant ⇒ Heating,

air conditioning system; Rep. gr. 00 ; Technical data; Refrig‐

erant oil .

♦ Air conditioner compressors with or without air conditioning

system magnetic clutch - N25- are currently actuated via an

air conditioner compressor regulating valve - N280- -C- exter‐

nally ⇒ Heating, air conditioning system; Rep. gr. 87 ; Re‐

frigerant circuit .

♦ The identification plate states the refrigerant for which the air

conditioner compressor is suitable. An air conditioner com‐

pressor regulating valve - N280- regulates the pressure on the

low-pressure side within the specified range (control charac‐

teristic) ⇒ Heating, air conditioning system; Rep. gr. 87 ;

Refrigerant circuit .

♦ The air conditioner compressor regulating valve - N280- is ac‐

tuated externally ⇒ Vehicle diagnostic tester in “Guided Fault

Finding” in air conditioning system.

♦ The engine must not be started in a vehicle with air conditioner

compressor but no air conditioner compressor magnetic clutch

- N25- if there is negative pressure in the refrigerant circuit

(e.g. during evacuation) ⇒ page 129 .

♦ The engine may only be started in a vehicle with air conditioner

compressor but no air conditioner compressor magnetic clutch

- N25- when the refrigerant circuit has been completely as‐

sembled.

♦ To ensure that the air conditioner compressor suffers no dam‐

age if the refrigerant circuit is empty, the air conditioner com‐

pressor regulating valve - N280- is no longer activated (the air

conditioner compressor idles with the engine) if the pressure

in the refrigerant circuit is too low (lower than approx. 2 bar).

♦ An air conditioner compressor with air conditioner compressor

regulating valve - N280- is switched over to internal lubrication

via a valve if the refrigerant circuit is empty.

♦ Depending on the version of air conditioner compressor, a

valve may be installed on the high-pressure side that prevents

liquefied refrigerant flowing back into the air conditioner com‐

pressor after the air conditioning system is switched off. If an

air conditioner compressor with this valve is installed in a ve‐

hicle with a refrigerant circuit with expansion valve, it could

take some time before the pressure on the high-pressure side

drops (the expansion valve is cold and the pressure on the

low-pressure side rises quickly after switching off, the expan‐

sion valve closes and refrigerant only flows slowly on the low-

pressure side). If the air conditioner compressor is switched

on, the pressure on the low-pressure side drops, the expan‐

sion valve opens and refrigerant can flow on the low-pressure

side.

1. Refrigerant circuit

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

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

♦ On an air conditioner compressor with electromagnetic clutch

-A- and regulating valve -C-, the electromagnetic clutch -A- is

usually only actuated if the regulating valve -C- is also actu‐

ated ⇒ Heating, air conditioning system; Rep. gr. 87 ; Refrig‐

erant circuit .

1.2.3

Electrical air conditioner compressor for

hybrid vehicles

Vehicles with high-voltage system (hybrid vehicles)

If repair work in the vicinity of high-voltage components and ca‐

bles is necessary, inspect high-voltage components and cables

for damage ⇒ page 4 ⇒ Electrical system; Rep. gr. 93 ; General

warnings for work on the high-voltage system .

If work on the components of the high-voltage system is neces‐

sary, ensure that the high-voltage system is de-energised ⇒ Rep.

gr. 93 ; De-energising high-voltage system .

De-energise the high-voltage system and restarting the high-volt‐

age system ⇒ Rep. gr. 93 ; De-energising high-voltage system

– To minimise the number of automatic engine starts when the

vehicle's drive system is active (READY) during test and

measurement work, charge the vehicle batteries e.g. with the

battery charger 60 A - VAS 5904- in battery standby mode ⇒

Electrical system - General information; Rep. gr. 27 ; Charging

battery and ⇒ Electrical system; Rep. gr. 93 ; General warn‐

ings for work on the high-voltage system .

Rep. gr.87 - Air conditioning system

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Air conditioning system -> 1.2.2 Mechanical air conditioner compressor for Your Volkswagen Touran 4 Door Second Generation (2015-2022)

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