INSTALLATION, START-UP & MAINTENANCE MANUAL
SD-220 TO SD-600
REV 04 – 10 Oct 2003
Page 16 of 32
Annually or after every 2500 hours of operation
• Check the desiccant for impurities and change it if necessary. A brown or yellow
color indicates that it has been contaminated with oil. Desiccant has an operating
lifetime of about 8000 hours under normal conditions.
• Check the screens installed in the desiccant chambers for impurities and if
necessary, clean them.
• Check the function of the inlet/exhaust valve combination by sending electrical
control signals.
• Replace the pilot air filter element.
4.1. REPLACEMENT OF THE DESICCANT
• Close dryer inlet/outlet isolation valves.
• Depressurize and switch off the adsorption dryer.
• Remove the drain plug and empty the old desiccant into a container.
• Screw the plug back in and fill new desiccant from above into the vessels.
• Pressurize the adsorption dryer per the start-up instructions and restore power to the
dryer.
NOTE: In order to ensure trouble-free operation, we recommend replacing the desiccant
at least every 8000 hours, or 2 years.
4.2. DISPOSAL OF THE DESICCANT
DANGER!
The desiccant can be disposed of at a suitable disposal site in
accordance with local or official regulations.
Note that the desiccant will remove and collect contaminants in the
process air and may therefore contain concentrated pollutants!
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