12. Maintenance
12.1 Procedures
12.1.1 Dust Drawer or hopper: The dust drawers (or hopper contents) should be checked and emptied periodically. The frequency of this step will depend on the number of shifts operating and conditions in the plant; however, it is a good practice to frequently remove residue build up. 12.1.2 HEPA/SAFETY Filters: The HEPA/SAFETY filters (if so equipped) are located on top of the unit (inside the HEPA/SAFETY filter assembly). Periodically, these filters should be inspected and replaced. Condition of the HEPA/SAFETY filter will generally be a function of the Magnehelic gage (for the HEPA/SAFETY filters – NOT the cartridge filters) reading. To examine: • Remove the two wing nuts for each filter • Lift off the filter “tie down” bar • Remove HEPA/SAFETY filters • Install new HEPA/SAFETY filters • Install HEPA/SAFETY filter “tie down” bar • Install the two wing nuts for each filter. 12.1.3 Metal Mesh Filters: The metal mesh filters (if so equipped) should periodically be inspected and cleaned. Any buildup of material in the filters can lead to fires. To examine: • Remove the access panel • Pull out both metal mesh filters • Wash with soap and water, and air dry • Replace both metal mesh filters • Replace the access panel. 12.1.4 Spark Baffles: The spark baffles (if so equipped) are located underneath the grating and should be periodically cleaned with mild soap and water. To examine: • Remove the access panel • Pull out both spark baffles • Wash with soap and water, and air dry • Replace both spark baffles • Replace the access panel. 12.1.5 Cartridge Filters: The cartridge filters will need to be replaced periodically. The frequency varies from a few weeks to a few years, depending on factors such as density of fumes/dust, particle size, humidity of air, oil or grease contents of matter, etc… To change out: • Remove any device that would prevent the cartridges from being removed (cartridges are located underneath the valves) • Pull both cam lock levers towards (you) (the filter guide bars should drop down) • Remove cartridge filters (they should slide out) • Slide the new filters into the unit (be sure to push the first installed filter, as far back as possible) • Push both cam lock levers away (from you) (the filter guide bars should rise) • Replace the access door.
12.1.6 Drain Valve: Periodically open the drain valve attached below the tank to drain the liquid build-up in the air tank.
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