2019 3 D4OPTRS
DST-4 SYSTEM
FUNCTION
Sweepers equipped with the optional 435 Dustless Sweeping Technology (DST) allow the
pickup head to sweep virtually dust free without the use of external water spray nozzles. A
fi lter box assembly is located just behind the cab and is used to fi lter a small percentage of air
bled from the pressure side of the sweeper. Bleeding this air creates more suction beneath
the pickup head causing the dustless effect.
DESCRIPTION OF OPERATION
Control of the amount of air bled off is fully automated and requires the operator to simply
turn on the DST-4 control switch (labeled “DC” for short) at the sweeper console in the cab.
Turning on the DC switch activates a control system which opens and closes a fl ue plate
(See M01307) to control the amount of air bled from the pressure side of the sweeper. The
system has been set to bleed off the minimum amount of air required to maintain the dustless
sweeping effect regardless of blower RPM. The lower set point is 1.8 inches of water column
and the upper set point is 2.2 inches creating a 2 inch nominal setting. Should the operator
increase or decrease the blower RPM, the system reacts to open or close the fl ue plate to
maintain the 2 inch nominal reading. The set points are not adjustable.
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