AEC WD 350 through WD3000 Dehumidifying Dryers - Manual (Page 50)

Use a detergent that won’t damage filter media. Such a detergent permits easy removal of dirt
particles through flushing and rinsing. An effective detergent removes the fine particles from the
pores of the filter media.
The filter manufacturer recommends FM 1400 washing compound. It is formulated specifically
for air filter element cleaning. It is non-sudsing and works in hot or cold water. FM 1400
contains biodegradable synthetic detergents and is non-phosphate, non-NTA. For more
information, contact Filter Service Corporation, 2603 A West Main, Farmington, NM
1-505-326-1127.
Recommendations for Cleaning and Replacing Filters
• Turn off and/or lock out electrical power to the dryer.
• Remove the threaded fastener securing the filter access cover, then remove the cover.
• Remove the nut on the center retaining rod to remove the filter cartridge.
Vacuuming
Clean a soiled filter by first vacuuming it. Vacuuming removes most large particles and surface
contaminants; you may not need to do any more for the first time you clean a filter. Use a
commercial-duty (recommended) or household vacuum cleaner. Vacuum the filter from the air
intake (dirty) side only.
Cleaning with Compressed Air
Blow clean, dry compressed air up and down the pleats, blowing out the filter from
the clean side. Remove loose dirt from the filter with compressed air or a water
hose. Compressed air should be less than 100 psi (689.5 kPa/6.89 bars). Use a
1 /
8
”-
dia. (3 mm-dia.) nozzle at least 2” (5 cm) away from the filter. Don’t shoot the air in
a crisscross motion against the grain of the pleats, as you could damage it.
Washing
As a last resort, wash the filter. However, do so only if the pressure drop is too
high from fine dirt embedded in the filter, or if oily mist is present near the
intake air location. Soak it in a solution of FM 1400 or comparable detergent and
warm water from five to ten minutes, then gently agitate for several minutes.
Rinse thoroughly with clean water to remove all detergent. Let the filter dry
completely before returning it to service. Do not use a light bulb to dry the filter.
You should get satisfactory filtration after second or third washings; however, dirt-
holding capacity of the filter decreases after each washing.
WDMR and WDFR Series Dehumidifying Dryers Page 49