AEC AP Series Large Dehumidifying Dryer - Manual (Page 85)

Large Dehumidifying Dryers Maintenance 84
5-2 Preventative Maintenance
Cleaning or Replacing the Process Air Filters
Regular filter cleaning will keep your dryer operating at peak efficiency. The process air
filters protect the centrifugal blowers from plastic fines being drawn in from the drying
hopper. Filters should be cleaned when airflow restriction trips the dirty filter alarm. Filters
should be replaced at least once a year.
Caution! Operating the dryer without the process air filters installed will void the
warranty.
On 600-1500 cfm dryers, there is a single high-temperature (up to 350ºF) filter mounted
above the process blower on the rear of the dryer. On 2000-3000 cfm dryers, there are two
high-temperature (up to 350ºF) filters located in the housing under the blower platform on the
left rear corner of the dryer.
Vacuuming. Vacuum cleaning is the preferred method for cleaning the process air filters
because compressed air or high-pressure washing can damage the filter. Vacuuming removes
most large particles and surface contaminant. Use a commercial duty vacuum cleaner and
vacuum the filter from the air intake (dirty) side only.
Compressed Air Cleaning. Blow clean, dry compressed air up and down the pleats, blowing
out the filter from the clean side. Do not shoot the air in a criss-cross motion against the grain
of the pleats—this won’t clean the filter, and it may damage it. Compressed air should be less
than 100 psi—use a 1/8 diameter nozzle at least 2 inches away from the filter.
Figure 13: Process Filter Housing
High
Temeprature
Gasket
Stainless Steel
Filter Housing
High
Temperature
Cartridge Filter
Stainless Steel
Filter Housing
Cover Filter Housing
Cover Latches
Filter Housing
Cover Latches
High
Temeprature
Gasket Stainless Steel
Filter Housing
Cover
High
Temperature
Cartridge Filter
High
Temeprature
Gasket
Stainless Steel
Filter Housing
600-1500 cfm dryers 2000-3000 cfm dryers