9.5.1 Depending on operating conditions, reaching equilibrium for filter differential pressure may vary from a few hours to several weeks. Low dust loading will normally develop 2- 3” w.g., normal loading typically generates 3-6 ” w.g., and high loading varies from 6 - 10 ” w.g. 9.5.2 Low dust loading typically shows a steady level of differential pressure with very little fluctuations once equilibrium is reached. By contrast, heavy loading can produce s ignificant “Ups and Downs” in operating differential pressure. 9.5.3 If your unit is equipped with the programmable pulse control, then it is usually necessary to gradually (over a period of weeks or months) raise the high and low set points to reflect the normal buildup on the filters.
10. 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: • Remove the exhaust inlets on the front of the unit (the filter cartridges are now visible) • Power up the fan • Slowly introduce (1/2 lb. per cartridge) the pre-coat • Try to coat the cartridges evenly
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 lights, and other auxiliary equipment.
CAUTION: Off line cleaning can cause pressure waves to feed back through system. Precautions may be necessary to prevent dusting.
Page 12
sales@clean-air.com
1-866-665-1829
www.clean-air.com
Made with FlippingBook Online newsletter maker