9. Service and maintenance
47
Fig. 20
1 Air filter
2 Fixing clip
Change the air filter as follows:
• Loosen screw at fixing clip ( - 2 - Fig. 20)
• Pull off the air filter ( - 1 - Fig. 20) and replace it with
a new one
• Retighten screw at fixing clip ( - 2 - Fig. 20).
Changing intervals for air filter cartridge
The operating conditions (e.g. coolant temperatures),
the operating modes and the quality of the intake air
(e.g. content of dust, content of gaseous foreign matter
such as SO2, solvent vapours, etc.) have a strong
influence on the service life of the filters (air filters, oil
filters, fine separators).
Where such conditions exist the filter element may
require changing more frequently.
9.8 Safety valve
Fig. 21
1 Safety valve
Fig. 2b shows the safety valve of the L07FS-L11FS series.
Testing the safety valve
The valve should be tested on a separate compressed
air line in accordance with local legislation.
Operate the safety valve (-1- Fig. 21 ; -8- Fig. 2)
depending on the type of valve:
• by unscrewing the cap one or two turns and
retightening it
• or by pulling the valve lifting lever
Danger
Never operate a screw compressor system with a
defective safety valve or without safety valve!
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