User guide

Manual Unload Type
The internal 3-way vacuum valve is energized simultaneously with the vacuum
pump. This allows a vacuum to be drawn through the dust collector, tubing and
loader, starting the conveying cycle. During the conveying cycle, dust laden air
enters the filtering section of the dust collector and the dust is separated from the
air stream tangentially. This dust is deposited in the manual dump container below
the filter chamber.
IMPORTANT: The bottom collection container needs to be emptied periodically and not
allowed to overfilled. This can cause dust to back up into the top filter section of the dust
collector causing ineffective separation and premature clogging of the internal filter.
At the end of the load cycle, the 3-way vacuum valve is de-energized closing off
the vacuum line and venting into the atmosphere. This causes a reverse flow of
atmospheric air to rush through the internal cartridge filter. Fines and dust trapped
during the conveying cycle are blown off the filter before the next conveying cycle
begins.
Automatic Unload/Reload Type
Automatic unload/reload type dust collectors consist of two conical sections
clamped to the collector plate of the manual dump container. The upper chamber is
a small conical receiver containing an air operated conical valve at its base. The
lower chamber contains a take-away and air vent valve. The 3-way vacuum breaker
valve operation is the same as described for manual collectors.
At the beginning of the load cycle, the timer, located in the dust collector control
box is energized, opening the air vent valve. This timer should be set for 5-10
seconds. During this time, dust, deposited in the lower chamber from the previous
cycle, is conveyed back to the loader through the “Y” diverter tube (See
Installation Section entitled, Dust Return Line Connection). At the end of 5-10 sec-
onds, the air vent valve closes, diverting 100% vacuum to the main material flow.
During the rest of the vacuum load cycle, dust is deposited in the upper section. At
the end of the load cycle, this dust is dumped through the conical valve into the
take-away section. When the vacuum pump is energized the conical valve closes
and the solenoid air vent opens and the load cycle is repeated.
When an auto unload/reload type dust collector is installed in a multiple loader
conveying system, it is very important to note that the loader’s filter receiving the
carryover dust from the dust collector will accumulate dust to the point of clogging
its internal filter. To prevent this from happening, the bottom auto unload/reload
chambers of the dust collector should be replaced with a manual dump container to
collect the separated dust. The manual dump container will require periodic empty-
ing.
4-2 l Operation