manual) for drain valve maintenance instruc-tions.Before restarting the purifier, open the manual drainon the particulate filter. If no liquid discharges, closedrain.WARNINGIf any liquid discharges from the particulatefilter, immediately stop using the purifier out-let air for breathing. Replace all elements andthe catalyst vessel. Contact Deltech beforerestarting the purifier.Weekly• Open the manual drain on the particulate filter.If any liquid discharges, immediately stop usingthe purifier outlet air for breathing. Check thecoalescing filter drain valve as described under“Daily” maintenance, above. Replace all filterelements and the catalyst vessel.Monthly• Remove screen from front of condenser andclean condenser coils of accumulated dust anddirt with a soft brush.Every four months• Replace activated carbon filter. See Mainte-nance Procedures for instructions.Yearly• Replace catalyst vessel.To replace the catalyst vessel, follow the procedure forreplacing the activated carbon filter (above). The con-nection sizes on the catalyst vessel are different fromthose on the activated carbon filter to prevent inter-changing these components.MAINTENANCE PROCEDURESCarbon or Catalyst Vessel ReplacementFollow this procedure to replace the activated carbonfilter or the catalyst vessel (the word “vessel”will beused to indicate both):1. Shut down the purifier according to the Shutdownprocedure.2. Remove the top cabinet panel to expose the vessel,and remove side panels as necessary to reach thesecuring clamp and pipe connections.3. Models 8DM100 and 8DM150—set up the boomassembly (see “Boom Assembly” section) and at-tach the hoist to the top of the vessel.4. Disconnect the unions on the top and bottom ofthe vessel.5. Open the hinged clamps securing the vessel to itssupport bracket.12 Pyramid 8000 ® Series Purifiers (Bulletin 289)Caution Label: Use of Charcoal ElementPart No. 56DE197ADanger Label: Use of Catalyst VesselPart No. 56DE196A