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Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017
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Repair notes
⇒ “3.1 Rules for cleanliness”, page 8
⇒ “3.2 Refrigerant circuit seals”, page 8
⇒ “3.3 Refrigerant and refrigerant oil”, page 9
⇒ “3.4 Handling pressurised tanks/containers”, page 11
⇒ “3.5 Handling refrigerants”, page 12
3.1
Rules for cleanliness
Even small amounts of contamination/soiling can lead to defects.
Therefore, observe the following rules for cleanliness when work‐
ing on the air conditioning system:
♦ Seal open pipes and connections immediately with clean
plugs, for example from the engine bung set - VAS 6122- .
♦ Place removed parts on a clean surface. Cover with lint-free
cloths only.
♦ If repair work cannot be performed immediately, carefully cov‐
er or seal components.
♦ Install only clean parts; do not remove new parts from pack‐
aging until immediately before installing. Do not use parts that
lk
have been stored outside their packaging (e.g. in tool boxes).
♦ Do not work with compressed air when the system is open.
♦ Protect disconnected electrical connections from dirt and wa‐
ter and only reconnect in dry condition.
3.2
Refrigerant circuit seals
♦ Renew seals after removal.
♦ Moisten seals with refrigerant oil before installing.
♦ Ensure proper seating of seals on the pipe or in the groove.
♦ Work in a completely clean environment. Even the smallest
contaminants, e.g. a hair, can cause leaks.
♦ Install only seals resistant to refrigerant R134a/R1234yf and
respective refrigerant oil ⇒ Electronic parts catalogue (ET‐
KA) .
The dimensions -a- and -b- depend on the fitting location of the
seal ⇒ Electronic parts catalogue (ETKA) .
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Rep. gr.00 - Technical data
GETth
English 
