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Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017
Note
♦ The refrigerant circuit should then only be blown through with
compressed air and then with nitrogen if there are no means
of flushing the refrigerant circuit, or the amount of work nec‐
essary to flush individual components would be too great
(removed refrigerant lines can also be blown through, for ex‐
ample, to remove low level contaminants and moisture without
taking much time).
♦ The method of blowing through the whole refrigerant circuit
with compressed air and nitrogen often requires a lot more
work than cleaning (flushing) with refrigerant R1234yf. When
flushing with refrigerant R1234yf, cleaning of the components
is also far more efficient. It is therefore always best to flush the
system in the event of complaints (the method of blowing
through should only be selected for certain complaints and for
individual components).
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♦ Under certain circumstances it may be sufficient, for example,
to blow through selected components (e.g. individual refriger‐
ant lines or refrigerant hoses) with compressed air (e.g. to
force out old refrigerant oil from individual removed compo‐
nents) or nitrogen (to dry individual components).
♦ Certain contaminants are difficult or impossible to remove
from the refrigerant circuit with compressed air. These con‐
taminants can be removed, for example, by cleaning (flushing)
with refrigerant R1234yf
⇒ “1.6 Cleaning refrigerant circuit”, page 92 .
♦ When blowing through (with compressed air or nitrogen), the
maximum working pressure should not exceed 15 bar (equa‐
tes to the pressure in a filled refrigerant circuit with an ambient
temperature of approx. 60°C, if necessary use pressure limiter
for compressed air as well).
♦ If during the gas analysis it is found that R1234yf refrigerant
has been contaminated with a different gas, it must be extrac‐
ted from the refrigerant circuit and disposed of as a gas of
unknown composition in accordance with the relevant legisla‐
tion ⇒ VW / Audi-ServiceNet and ⇒ page 161 .
♦ Contaminated refrigerant can cause decomposition products
to form and accumulate in the refrigerant circuit. These cannot
be extracted with the refrigerant. The contaminated refrigerant
oil, in this case, must be removed from the refrigerant circuit
by flushing with refrigerant
⇒ “1.6 Cleaning refrigerant circuit”, page 92 .
♦ If there is no suitable air conditioner service station available
for the R1234yf refrigerant, the air conditioner service station
designed for R134a refrigerant may also be used and the re‐
frigerant circuit may also be flushed with R134a refrigerant.
Using R134a refrigerant to clean the refrigerant circuit is cur‐
rently permissible ⇒ Air conditioning system with R134a re‐
frigerant; Rep. gr. 87 ; Refrigerant circuit; Flushing (cleaning)
refrigerant circuit with R134a refrigerant .
CAUTION
Risk of injury from nitrogen escaping under high pressure.
– Use pressure limiter for nitrogen tank.
– Always clean components against the direction of refrigerant
flow (flush with R1234yf refrigerant) or blow through.
1. Refrigerant circuit
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