4.7.1.2 Option da
Cyclone separator
Condensate accumulating during the air cooling process is separated, fed to the exhaust gas si‐
lencer and evaporated there.
4.7.1.3 Option db
Heat exchanger
The oil/air heat exchanger is fed with hot compressor cooling oil that warms the outgoing moisture-
reduced compressed air.
This warm, dry compressed air is ideal for sand blasting, for example.
4.7.1.4 Option dd
Filter combination
The dried compressed air passes through a pre-filter and micro-filter combination and emerges oil-
free.
4.7.1.5 Option dc
Fresh air filter
Compressed air from oil-injected compressors may not be used directly as breathing air.
The concentration of contaminants will increase during the compression of the intake ambient air
and cooling oil and abraded particles can enter the compressed air. This requires a subsequent
treatment of the pre-filtered compressed air.
Air must be filtered to remove all contaminants, such as fine dust and oil as well as odours, before
it can be used for breathing purposes.
For this purpose, part of the compressed air output from the compressor is passed through a mi‐
cro-filter and activated carbon filter combination.
The connection to air treated in this way is specially marked. It is designed as a quick-release cou‐
pling next to the outlet valves on the compressed air distributor.
DANGER
Danger from toxic air!
Danger of respiratory arrest because the filter does not remove CO/CO
2
, methane or other
toxic gasses or vapours.
➤
Never use the machine in enclosed spaces, only in the open.
➤ Clean inlet air without hazardous contaminants. Engine exhaust must not be drawn into
the compressor.
The treated air does not meet the local standards for 'Compressed air for breathing appara‐
tus'. Therefore, it must not be used as pure breathing air but may be used to reinforce the
flow of fresh air when working in dusty or dirty conditions such as sand blasting.
Further information See chapter 2.7.2 for ambient conditions under which the fresh air filter can be used.
4.7.1.6 Option ea, ec
Tool lubricator
Compressed air containing lubricating oil is needed for the lubrication of certain air tools. The tool
lubricator introduces a fine oil mist into the compressed air for this purpose.
4 Design and Function
4.7 Options
38
Service manual Portable compressor
M122 No.: 9_6974 20 E
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