Get Air conditioning system Working with air conditioner service station -> 2.3 Performing gas analysis of refrigerant Guide for Volkswagen Sharan VAN Second Generation (2010-2023)

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

Air conditioning systems with refrigeranR1234yf - General information - Edition 07.2017

♦ ⇒ “2.14 Checking pressures”, page 170

2.3

Performing gas analysis of refrigeran

Note

♦ For operation of the air conditioning system, iis importantha

the refrigeranused has a certain degree of purity.

♦ Contamination with other refrigerants or gases can cause

damage and thereby failure of the air conditioning system.

♦ Contaminated refrigeranmusbe returned as gas of unknown

composition e.g. to your gas supplier for processing (or dis‐

posal) in accordance with legislative requirements ⇒ VW /

Audi-ServiceNe.

♦ To prevenliquid components (e.g. droplets of refrigeranoil)

in the extracted refrigerangas from falsifying the resulof the

gas analysis, separators (filters) are installed in the gas anal‐

ysis device thaseparate these droplets of liquid. Renew

separators in accordance with specifications of gas analysis

device or operating instructions of air conditioner service sta‐

tion ⇒ Operating instructions of gas analysis device or ⇒

Operating instructions of air conditioner service station .

All vehicles

– Connect the gas analysis device or air conditioner service sta‐

tion to the refrigerancircuias instructed to do so, and bring

iinto operation ⇒ Operating instructions of gas analysis de‐

vice ,

⇒ “2.2 Connecting air conditioner service station to refrigeran

circuit”, page 131 and / or ⇒ Operating instructions air condi‐

tioner service station .

– Perform the gas analysis as per the operating instructions.

Note

♦ A faulty gas analysis is possible from air in the refrigeranho‐

ses or non-observance of the procedure for gas analysis as

detailed in the operating instructions.

♦ Carefully follow the operating instructions of the gas analysis

device / air conditioner service station .

♦ Evacuate refrigeranhoses of the air conditioner service sta‐

tion before connecting the service couplings to the refrigeran

circui/ gas cylinder with R1234yf refrigeranhose (see oper‐

ating instructions of gas analysis device / air conditioner serv‐

ice station

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

The gas analysis may provide the following results:

♦ The R1234yf refrigerancomplies with the specifications, the

planned measures may be performed with the air conditioner

service station .

♦ A fauloccurred during the gas analysis. The faulis to be in‐

vestigated and rectified after which the gas analysis musbe

repeated.

♦ The analysed R1234yf refrigerandoes nocomply with the

specifications, the analysed refrigeranmusbe extracted as

refrigeranof unknown composition and returned e.g. to your

gas supplier for processing (or disposal)

134

Rep. gr.87 - Air conditioning system

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

Air conditioning systems with refrigeranR1234yf - General information - Edition 07.2017

⇒ “6.2.17 Returning contaminated R1234yf refrigeranfor

analysis, processing or disposal”, page 25

Note

♦ Should the analysis of the refrigeran- to be extracted e.g. from

the refrigerancircuiof a vehicle - indicate thaiis contami‐

nated: you can also perform a gas analysis on the refrigeran

e.g. of another cylinder from your gas supplier if you wish to

verify the analysis result.

♦ Since R1234yf refrigeranis so pure, even small amounts of

ambienair in the charge hoses of the air conditioner service

station can falsify the results. For this reason, mosair condi‐

tioner service stations have a feature via which the gas anal‐

ysis is repeated up to 2 times before a noOK resulis

displayed ⇒ Operating manual for air conditioner service sta‐

tion .

♦ You can perform a simple function check on your gas analysis

device e.g. using ambienair (unscrew the service coupling

from the refrigeranhose with which the gas analysis is per‐

formed and analyse the gas with the refrigeranhose open).

The resulof this tesshould then indicate thathe analysed

gas is noOK.

♦ The method of gas analysis employed here was developed for

motor vehicle workshops. Iprovides no details abouthe pre‐

cise composition of the refrigerant. This gas analysis can

therefore only show how high the percentage of R1234yf re‐

frigeranis in the refrigerananalysed. If the percentage of

R1234yf is below 95%, the refrigerandoes nocomply with

the specifications and can cause damage to the components

of the refrigerancircuit. A gas analysis thaalso provides de‐

tails abouthe precise composition of the analysed refrigeran

is currently noavailable for workshops. Gas analyses with

which the precise composition of gases can be investigated

require complicated equipmenand procedures and can usu‐

ally only be performed with dedicated testing facilities.

Should contaminated refrigeranbe found during the gas analy‐

sis, notify the customer before continuing work and bring the

customer's attention to the following:

There is contaminated refrigeranor refrigeranof unknown com‐

position in the refrigerancircuiof his vehicle thadoes no

comply with the vehicle manufacturer's specifications. This re‐

frigerant:

♦ must be returned e.g. to the gas supplier as refrigeranof un‐

known composition for analysis, processing (or disposal)

⇒ “6.2.17 Returning contaminated R1234yf refrigeranfor

analysis, processing or disposal”, page 25 .

♦ can be the cause of a malfunction or may already have caused

damage thamakes the inevitability of malfunctions in the near

future probable.

♦ Depending on its composition, the use of contaminated refrig‐

erancould lead to the operating permiof the vehicle being

withdrawn.

♦ If, as a resulof contaminated refrigerant, internal damage to

the refrigerancircuihas been caused (e.g. decomposition

products of the contaminated refrigeranhave affected the

components of the refrigerancircui

⇒ “1.5 Renewing components”, page 79 ), the refrigerancir‐

cuican only be restored to full functionality once all compo‐

nents thacame into contacwith the contaminated refrigeran

have been renewed. The internal condition of the refrigeran

circuican be appraised e.g. by visually inspecting certain

2. Working with air conditioner service station

135

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

Air conditioning systems with refrigeranR1234yf - General information - Edition 07.2017

components of the refrigerancircui(e.g. the condition of the

internal surfaces of removed refrigeranlines and refrigeran

hoses, the internal surface of the refrigeranreservoir and the

condition of the removed dryer cartridge).

♦ If internal damage has been caused to the refrigerancircui

through contaminated refrigeran(e.g. failure of the air condi‐

tioner compressor has ensued owing to damaged control

elements or overheating, refrigeranoil has a stronger colour

than usual buthe parts containing refrigeranhave nobeen

affected ⇒ “1.5 Renewing components”, page 79 ), the refrig‐

erancircuican be charged again once ihas been flushed

(renew air conditioner compressor, dryer and expansion

valve). However, since there is no way of anticipating the long-

term effecof the contaminated refrigeranon the refrigeran

oil and the components of the refrigerancircuit, no guarantee

can be given in this case thathe components of the refrigeran

circuiwill function correctly in future.

♦ If the contaminated refrigeranhas nocaused internal dam‐

age to the refrigerancircui(e.g. the refrigeranoil does no

have a stronger colour than usual, the components of the re‐

frigerancircuihave nobeen affected), the refrigerancircui

can be charged again once the dryer has been renewed and

the refrigerancircuihas been evacuated for an extended pe‐

riod (aleas1 hour). However, since there is no way of

anticipating the long-term effecof the contaminated refriger‐

anon the refrigeranoil and the components of the refrigeran

circuit, no guarantee can be given in this case thathe com‐

ponents of the refrigerancircuiwill function correctly in future

⇒ “1.5 Renewing components”, page 79 .

136

Rep. gr.87 - Air conditioning system

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

Air conditioning systems with refrigeranR1234yf - General information - Edition 07.2017

Note

♦ If there is a complainthacan be attributed to the contamina‐

ted refrigeran(e.g. leaking seals or hoses, damage to the air

conditioner compressor, contaminated refrigeranoil), the re‐

frigerancircuimusbe flushed and then all components tha

were damaged by the contaminated refrigeran(seals, hoses,

reservoir or dryer cartridge, expansion valve and air condi‐

tioner compressor) musbe renewed. If iis found thathe

contaminated refrigeranhas affected other components as

well (e.g. the internal surfaces of the refrigeranpipes and re‐

frigeranhoses, damaged seals), the complete refrigerancir‐

cuimusbe renewed. The refrigerancircuimusthen be

recharged with clean refrigerant. Then check the function of

the air conditioning system. For the customer and to safeguard

yourself, make a note thathe refrigerancircuiwas charged

with contaminated refrigerant.

♦ If there is a complainthacan be attributed to the contamina‐

ted refrigeran(e.g. loss or lack of cooling output) and no other

complaints can be found in the refrigerancircuit, or if the re‐

frigeranhas to be extracted because work in the area of the

refrigerancircuiso requires, proceed as follows after evacu‐

ating the system. Remove the dryer and check for contami‐

nation. Since there could also be refrigeranoil on or in the

dryer, check this as well. If the refrigeranoil is contaminated,

dark or viscous or if deposits of dirhave built-up on the dryer,

flush the refrigerancircuiand renew the parts as described

above (damage may already have been caused, which could

soon lead to failure of the air conditioning system). If the re‐

frigeranoil is OK and the dryer is nocontaminated any more

than is usual from normal operation, renew the dryer. Evacu‐

ate the refrigerancircuifor an extended period (aleas1

hour) and then recharge with clean refrigerant. Check the

function of the air conditioning system. For the customer and

to safeguard yourself, make a note thathe refrigerancircui

was charged with contaminated refrigerant.

2.4

Emptying refrigerancircui

•

Depending on the type of equipmenchosen, there may be

changes to the procedure (always follow user's manual for the

equipmenbeing used) ⇒ Operating instructions air condi‐

tioner service station .

•

The refrigerancircuishould be emptied if parts of the refrig‐

erancircuiare to be removed, if iis unclear whether there is

refrigeranin the circuit, if contaminated refrigeranwas de‐

termined during the gas analysis, or if safety precautions so

demand.

•

All of the operating instructions for work involving refrigeran

with the air conditioner service station can be found in the op‐

erating instructions of the air conditioner service station ⇒

Operating instructions air conditioner service station .

Draining

– 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.

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

frigerancircuithaare noopen when de-energised:

2. Working with air conditioner service station

137

Air conditioning system Working with air conditioner service station -> 2.3 Performing gas analysis of refrigerant for Your Volkswagen Sharan VAN Second Generation (2010-2023)

Related Topics

Air conditioning system Working with air conditioner service station

Popular Owner Manuals

Latest Owner Manuals