• Use a PD filter at the inlet of the dryer. A filter at the outlet is not needed, since the desiccant
cartridge has an integrated dust filter. Should oil vapour and odours be 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
Reference Designation Reference Designation
1 Compressor 5 Dryer
2 Water separator 6 Receiver
3 DD filter (not required) 7 Inlet valve
4 PD filter 8 Outlet valve
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
2920 7083 21 21
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