8. Filter, type DD for general purposes (optional). The filter traps solid particles down to 1
micron with a max. oil carry-over of 0.5 mg/m
3
. A high-efficiency filter, type PD (optional),
may be installed downstream of a DD filter. This filter traps solid particles down to 0.01
micron with max. oil carry-over of 0.01 mg/m
3
. If oil vapours and odours are undesirable, a
QD type filter should be installed downstream of the PD filter.
It is recommended to provide by-pass pipes and valves across the filters in order to isolate
the filters during maintenance without disturbing the compressor.
9. Safety valve
4.3 Electrical connections
Working with machinery controlled by a frequency converter requires special safety
precautions. These safety precautions depend on the kind of network used (TN, TT, IT
system). Consult Atlas Copco.
Always disconnect the power supply before working on the electrical circuit!
See also section Electrical diagram for details.
Instruction book
48 API161475
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