D4OPTRS 4 2019
Should too little air be bled off, over pressure of the pickup head will occur and dust blow
out will result. Too much air bled off will decrease fi lter operational life as excess air fl ow will
deposit more dust on the fi lter media.
PRECLEANER
The air which has been bled off is sent through a centrifugal precleaner that rids the air of most
dust particles before passing the air through four large fi lter cartridges and is then exhausted
to atmosphere. The precleaner also removes moisture from the air stream protecting the
fi lters and thereby allowing the sweeping of intermittent accumulations of water, such as
water puddles from sprinkler systems, without jeopardizing the fi ltration components.
The precleaner dumps the separated debris into a scavenge bin that has a scavenge
hose attached and routed back to the hopper. The hopper vacuum draws the dust from
the precleaner scavenge bin through the scavenge hose back to the sweeper hopper for
deposit. Proper performance of the precleaner requires that the scavenge hose be kept open
and free fl owing. The precleaner should be removed once a day and dumped out to insure
good separation and unloading of dust into the scavenge bin. The scavenge bin then can be
inspected to see that it is NOT full of dust and that the scavenge hose is pulling the unloaded
dust back to the hopper. If the scavenge bin is full of dust, the scavenge hose has become
blocked and must be cleaned. The scavenge hose should be cleaned daily.
To insure the best operation of the precleaner, the HOPPER WATER should be turned on
and run whenever possible. The hopper water rids the air stream of a signifi cant amount of
dust and reduces the particulate load seen by the precleaner.
Once the air has passed through the precleaner, it enters the fi lter box. Four (4) fi lter cartridges
on two separate rows make up the fi lter pack. Dust accumulating on the fi lter cartridges is
periodically purged by alternately discharging a high velocity back pulse of air into the fi lter
row. The back pulse of air dislodges the dust from the fi lter media and deposits it in the fi lter
box hopper.
M01507
M01307
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