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Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017
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⇒ “6.2.17 Returning contaminated R1234yf refrigerant for
analysis, processing or disposal”, page 25
Note
♦ Should the analysis of the refrigerant - to be extracted e.g. from
the refrigerant circuit of a vehicle - indicate that it is contami‐
nated: you can also perform a gas analysis on the refrigerant
e.g. of another cylinder from your gas supplier if you wish to
verify the analysis result.
♦ Since R1234yf refrigerant is so pure, even small amounts of
ambient air in the charge hoses of the air conditioner service
station can falsify the results. For this reason, most air condi‐
tioner service stations have a feature via which the gas anal‐
ysis is repeated up to 2 times before a not OK result is
displayed ⇒ Operating manual for air conditioner service sta‐
tion .
♦ You can perform a simple function check on your gas analysis
device e.g. using ambient air (unscrew the service coupling
from the refrigerant hose with which the gas analysis is per‐
formed and analyse the gas with the refrigerant hose open).
The result of this test should then indicate that the analysed
gas is not OK.
♦ The method of gas analysis employed here was developed for
motor vehicle workshops. It provides no details about the pre‐
cise composition of the refrigerant. This gas analysis can
therefore only show how high the percentage of R1234yf re‐
frigerant is in the refrigerant analysed. If the percentage of
R1234yf is below 95%, the refrigerant does not comply with
the specifications and can cause damage to the components
of the refrigerant circuit. A gas analysis that also provides de‐
tails about the precise composition of the analysed refrigerant
is currently not available for workshops. Gas analyses with
which the precise composition of gases can be investigated
require complicated equipment and procedures and can usu‐
ally only be performed with dedicated testing facilities.
Should contaminated refrigerant be found during the gas analy‐
sis, notify the customer before continuing work and bring the
customer's attention to the following:
There is contaminated refrigerant or refrigerant of unknown com‐
position in the refrigerant circuit of his vehicle that does not
comply with the vehicle manufacturer's specifications. This re‐
frigerant:
♦ must be returned e.g. to the gas supplier as refrigerant of un‐
known composition for analysis, processing (or disposal)
⇒ “6.2.17 Returning contaminated R1234yf refrigerant for
analysis, processing or disposal”, page 25 .
♦ can be the cause of a malfunction or may already have caused
damage that makes the inevitability of malfunctions in the near
future probable.
♦ Depending on its composition, the use of contaminated refrig‐
erant could lead to the operating permit of the vehicle being
withdrawn.
♦ If, as a result of contaminated refrigerant, internal damage to
the refrigerant circuit has been caused (e.g. decomposition
products of the contaminated refrigerant have affected the
components of the refrigerant circuit
⇒ “1.5 Renewing components”, page 79 ), the refrigerant cir‐
cuit can only be restored to full functionality once all compo‐
nents that came into contact with the contaminated refrigerant
have been renewed. The internal condition of the refrigerant
circuit can be appraised e.g. by visually inspecting certain
2. Working with air conditioner service station
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