10. OPTIONAL PRE-COAT
10.1 The pre-coat is a specially formulated conditioner that enhances the performance of filter cartridges. It creates a highly permeable, protective layer on the surface of the filter media. Pre-coat applied to new filters forms a protective barrier on the surface of the filter media that stops fine particles from becoming trapped in the media structure. By keeping particulate on the surface, away from the media, the media remains open over a longer period of time and this means longer filter life. This feature also improves cake release as surface-loaded dust releases more easily during pulse cleaning. 10.2 When replacing cartridge filters, the new filters need to be pre-coated with silica based cellulose or other acceptable pre-coat material available on the market. The following steps should be taken to introduce the pre-coat to the cartridges: • Power up the fan • Slowly introduce (1/2 lb. per cartridge) the pre-coat
10.3 Pre-coat can be obtained through your distributor or from CLEAN AIR INDUSTRIES .
11. SHUTDOWN
11.1 De-energize (push the STOP button) the blower motor. The digital reverse pulse cleaning systems are equipped with an “ Off Line Cleaning ” feature which activates the reverse jet pulse cleaning. This element will clean the filter cartridges while the unit is off line, for a preset number of pulses. Once the cleaning cycle is complete the collector is ready to be energized when needed.
11.2 Secure power to the digital reverse pulse control.
11.3 Secure power to the other auxiliary equipment.
CAUTION: Off line cleaning can cause pressure waves to feed back through system. Precautions may be necessary to prevent dusting.
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 afterfilters: The HEPA/SAFETY afterfilters (if so equipped) are located on top of the unit (inside the HEPA/SAFETY afterfilter 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.
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