fixating screws are tightened firmly and that the wall or the floor is suitable for taking the
weight of the dryer.
• Provide enough space around the dryer to install and service the filter elements. A minimum
free space of 800 to 1000 mm is recommended.
If the filters are mounted directly onto the dryer, the dryer should eventually be positioned
higher to enable servicing of the filter elements.
• Use a DD filter and a PD filter at the inlet of the dryer. Use a DDp filter at the outlet of the
dryer. Should oil vapour and odours are undesirable, a QD carbon filter can be installed
downstream the DDp filter.
• If the compressor has no built-in water separator or if the dryer is not located near the
compressor, a water separator (WSD) has to be installed before the dryer in order to prevent
free water from entering the dryer, as free water can damage the desiccant. If the
condensate contains oil, install an oil/water separator for draining of pure condensate water
(consult your supplier).
• The drain hoses of the water separator and the filters must not dip into the sewer.
• It is recommended to install bypass pipes with ball valves over the filters in order to isolate
the filters during service operations without disturbing the compressed air delivery.
• It is required to install pressure relief valves on the dryer when ball valves are installed at the
inlet and the outlet of the dryer to isolate the dryer from the air net.
• If dryers are used in parallel make sure that all dryers can be bypassed through one of the
other dryers, as shown in below figure:
Parallel installation of CD dryers
Never overload the dryer as this will damage the desiccant. It may be recommended to
install the air dryer upstream of the air receiver to prevent overload (e.g. after extending the
dry air circuit). Consult Atlas Copco if in doubt.
Instruction book
20 API093050
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