When servicing your Air dryer, the following items should be inspected and or replaced.
1. DESICCANT & INNER FILTERS
The drying desiccant may lose its ability to absorb water particles due to age or being exposed to excessive moisture and/or oil carry over from the oil based compressors feeding the airline. Should the dying desiccant deteriorate to the extent that the required dew point is no longer being achieved, the desiccant requires replacement.
• Empty the pressure vessels (tanks).
• Drain the desiccant through the drain port which is situated at the bottom of each vessel.
• If there is no drain port on the vessel, remove the whole bottom pipe assembly and the vessel’s inner filter to drain the all the desiccant.
• While the desiccant is draining, remove the top inner filters. To remove the top inner filters, open the top inspection covers or remove the top pipe assembly.
• Once the all the desiccant has drained out, inspect the bottom inner filters and replace if necessary. Reassemble the bottom covers and pipe work.
• The new desiccant can be added through the top openings.
• In order to have the desiccant compact, tap on the vessel with a rubber mullet while filling the vessels with the desiccant.
• Once completed, inspect all inner filters for damage, and if damaged, replace them. Then close the covers and check for any air leaks.
• It is recommended that every 6 months all the valves are inspected for correct operation.
• Non-serviceable valves must be replaced when necessary.
• The serviceable valves should be disassembled, cleaned, new seals inserted and then reassembled and re-inspected for correct operation.
3. MOISTURE SEPARATOR & OIL TRAP
• All pre and after filters, including the oil trap, can be inspected and serviced at the same intervals as the valves
• Pre and after filters usually have replaceable cylinders of 1 or 5 microns. The microns used are dependent on the quality of air required.
• All filters are cleaned out, washed, refilled with new material and checked for any air leaks.
• Activated carbon is used in the oil trap. It can be in a replaceable cylinder or in pellet form.
• The lifespan of all filters depends on the air quality that is being cleaned
• Polar Air manufactures regenerative desiccant air dryers that utilises Activated Alumina grade F200 drying desiccant.
• Activated Alumina is a highly porous, ceramic spherical bead that can absorb both gases and liquids and is available in 2mm-8mm sizes. This desiccant is placed within the pressure vessels of the air dryer
• The average life span of Activated Alumina is 5 years under ideal operating conditions.