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6450... Safety instructions for handling R134a refrigerant

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WARNING: Risk of injury!
Refrigerant circuit is under high pressure! Work on the refrigerant circuit may only be carried out by experts!
Draw off refrigerant without fail BEFORE  all repair work on the refrigerant circuit.
The refrigerant circuit is depressurized AFTER drawing off! 
It is absolutely essential to read and observe the relevant operating instructions for the A/C service unit used!

Protective measures/rules of conduct 

First aid measures