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Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017
Note
♦ The quick release couplings come in different versions -A- and
-D-. On both versions of these quick release couplings, the
refrigerant lines -C- can be released and removed in the same
way, e.g. with refrigerant line release tool -T40149/1- ⇒ Heat‐
ing, air conditioning; Rep. gr. 87 ; Refrigerant circuit (vehicle-
specific workshop manual).
♦ For quick release coupling version -A-, the control pins -B- be‐
come visible after installing the refrigerant line -C- once the
engaged refrigerant line -C- is pulled in the direction of arrow.
♦ For quick release coupling version -D-, the refrigerant line
-C- is installed in the same way as quick release coupling
-A-. When the refrigerant line -C- on this version is pulled in
the direction of arrow following assembly, the snap ring -E-
protrudes from the quick release coupling -D-, thereby indi‐
cating that the retaining ring -F- is completely engaged with
the refrigerant line -C-. The snap ring -E- must then be re‐
moved from the refrigerant line -C-.
1.2.15
Seals
♦ These seals seal the connection points between the individual
components of the refrigerant circuit
⇒ “3.2 Refrigerant circuit seals”, page 8 .
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1.2.16
Pipes and hoses in refrigerant circuit
♦ In its pure state, R1234yf refrigerant is chemically stable and
has no corrosive effect on e.g. iron, aluminium and specially
developed plastics that are suitable for this purpose. A mixture
of refrigerant oil and R1234yf refrigerant can affect certain
metals (e.g. alloys with copper) and affect or degrade certain
hose materials and plastics. Therefore, use only genuine re‐
placement parts ⇒ Electronic parts catalogue .
♦ Only use components that are resistant to R1234yf refrigerant
and its associated refrigerant oils. Do not use components
(such as seals and hoses, which are made of plastic) that
cannot be clearly allocated ⇒ Electronic parts catalogue .
♦ The pipes and hoses are held together by threaded connec‐
tions and / or special joints ⇒ Heating, air conditioning; Rep.
gr. 87 ; Refrigerant circuit (vehicle-specific workshop manual).
♦ Renew the sealing elements (e.g. seals) between the compo‐
nents ⇒ Electronic parts catalogue .
♦ For threaded connections, observe the specified torque set‐
tings. For pressure-fit connections, use dedicated release
tools ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigerant
circuit (vehicle-specific workshop manual).
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Rep. gr.87 - Air conditioning system
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