9. Service and maintenance
50
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.
Change the air filter as follows:
• Switch the screw compressor unit off and ensure
that it is depressurized, electrically isolate and
locked off.
• Pull snap latch outward and remove housing base.
• Detach air filter cartridge while slightly turning it.
• Carefully insert new air filter cartridge in the
housing.
• Close air filter with housing base. The snap latches
must click into position.
9.8 Safety valve
Fig. 24
1 Safety valve
2 Valve cap
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. 24), depending on
the type of valve:
• Slightly turn the valve cap (-2- Fig. 24) (1-2 turns),
and then re-close it.
• Actuation of the bleeding lever/pulling ring
Warning
Never operate a screw compressor system
with a defective safety valve or without
safety valve!
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