Get Air conditioning system -> 1.2.6 Reservoir 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

Evaporator in heating and air conditioning system (or in the bat‐

tery cooling module)

♦ The liquid refrigerant evaporates in the pipelines of the evap‐

orator -A-. The heat required to do this is drawn from the air

flowing over the evaporator fins -B-. The air cools down. The

refrigerant evaporates and is drawn into the air conditioning

system compressor carrying with it the heat it has absorbed.

♦ A defined quantity of refrigerant is fed to the evaporator

through an expansion valve (restrictor). In systems with an

expansion valve the flow rate is regulated such that only gas‐

eous refrigerant emerges at the evaporator outlet.

♦ When R1234yf refrigerant was introduced, the evaporators

were adapted to the refrigerant, hence the need to observe the

correct version ⇒ Electronic parts catalogue .

Evaporator / heat exchanger for high-voltage battery (chiller)

The liquid refrigerant evaporates in the evaporator (heat ex‐

changer). The heat required to do this is drawn from the coolant

that flows through the evaporator. The coolant cools. The refrig‐

erant evaporates and is drawn into the air conditioner compressor

carrying with it the heat it has absorbed.

A defined quantity of refrigerant is fed to the evaporator through

a restrictor (or an expansion valve) and a shut-off valve. The flow

rate of the coolant (or refrigerant) is regulated in such a way that

only gaseous refrigerant escapes at the evaporator outlet ⇒

Heating, air conditioning; Rep. gr. 87 ; Refrigerant circuit; System

overview - refrigerant circuit (vehicle-specific workshop manual).

1.2.6

Reservoir

Note

This type of air conditioning system is currently only installed in

systems with a restrictor.

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

♦ The reservoir collects the vaporised and gaseous mixture

coming from the evaporator to ensure the air conditioner com‐

pressor receives only gaseous refrigerant. The vapour be‐

comes gaseous refrigerant.

♦ Refrigerant oil flowing in the circuit does not remain in the res‐

ervoir because an oil extraction hole has been provided.

♦ Any moisture ingress into the refrigerant circuit during assem‐

bly is trapped by a filter (desiccant bag) in the reservoir.

♦ Gaseous refrigerant with oil is drawn in by the air conditioner

compressor.

Note

♦ Renew the reservoir if the refrigerant circuit has been open for

an extended period of time and moisture has entered or if re‐

quired to do so owing to a specific complaint ⇒ page 79 .

♦ Do not remove sealing plugs -A- and -B- until just before in‐

stallation.

♦ A dryer kept in an unsealed reservoir is saturated with mois‐

ture after a short time and cannot be used.

♦ When installing, observe arrow indicating direction of flow if

applicable.

1.2.7

Heat exchanger for heat pump mode

The gaseous or vaporous refrigerant compressed by the air con‐

ditioning compressor is liquefied in the heat exchanger -A-. The

heat that is given off in the process is picked-up by the coolant

flowing through the system ⇒ Heating, air conditioning; Rep. gr.

87 ; Refrigerant circuit; System overview - refrigerant circuit .

1.2.8

Liquid receiver

In certain operating conditions (e.g. in heat pump mode), the re‐

ceiver (e.g. on the condenser) is not integrated in the refrigerant

circuit. The receiver -B- collects the refrigerant, temporarily stores

any excess should a certain amount of refrigerant not be required

and then feeds it in a steady flow to the expansion valve (in front

of the evaporator in the heater and air conditioning unit) or to the

heat exchanger in the coolant circuit of the high voltage system

⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigerant circuit; Sys‐

tem overview - refrigerant circuit .

1. Refrigerant circuit

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Air conditioning system -> 1.2.6 Reservoir for Your Volkswagen Touran 4 Door Second Generation (2015-2022)

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