CDF MODULAR DUST COLLECTOR
Page 10
© 2017 CLEMCO INDUSTRIES CORP.
www.clemcoindustries.com
Manual No. 23478 Rev D
3.3.4
Check the differential-pressure gauge; if
differential pressure is greater than 3" water column
(W.C.), turn the sequence switch ON. Leave the switch
OFF if the differential pressure is less than 2” above the
initial reading.
NOTE: Optimal filtering efficiency is
obtained with differential pressure between 3" and
5". Adjust pulse pressure (per Section 4.1) and pulse
off time (per Section 4.2) as need to maintain 3" and
5" differential pressure.
NOTICE
Do not turn the sequence switch ON until the
cartridges are seasoned per Section 6.2.
3.4 Shutdown
3.4.1
Allow the system to run until all system
components are empty (refer to the accessory component
operation manuals) and all areas ventilated are free of
airborne dust.
3.4.2
Turn OFF the exhauster.
3.4.3
Shut OFF the air supply to the pulse manifold.
3.4.4
Drain pulse manifolds. The drain cock is mounted
at the bottom of each manifold. Refer to Figure 1. Drain
whenever the air supply is turned OFF.
3.4.5
Close the dust-hopper dump-valves, and empty
all dust receptacles.
4.0 ADJUSTMENTS
4.1 Pulse
Pressure
4.1.1
The pulse pressure regulator is located on the
manifold inlet. Start the pulse cycle with the pressure at
70 psi. An additional manifold pressure gauge is
mounted on the differential-pressure panel to enable
monitoring pressure from ground level. The panel is
usually mounted on the back, right side of the collector.
Refer to Figure 1 and Figure 5.
4.2
Pulse-Sequence Control Panel and Timer
4.2.1
The toggle switch mounted on the sequence
control-panel cover enables or disables the pulse
sequencing. If the switch is ON, the pulse sequence will
automatically start whenever the dust collector
exhauster is started. If the switch is OFF, the pulse
sequence will not occur. The switch should be left OFF
(no pulse) until the cartridges are seasoned per Section
6.2.
4.2.2
The timer is factory set at 40 seconds OFF and
approximately 15/100 of a second ON. Every 40
seconds, one filter rack is pulsed in sequence until all
filters have gone through a cycle.
4.2.3
As the filters cake with dust, the pulse may not
clean them well enough to bring the differential pressure
within the optimal range of 3" to 5". A pressure reading
higher than 5" is an indication that more frequent pulse
is needed. When the differential-pressure gauge shows
a constant pressure difference greater than 5", adjust
the OFF time setting to 20 seconds. DO NOT ADJUST
ON TIME. Increasing ON time will consume more air,
but will NOT increase cleaning efficiency.
4.2.4
When the frequency of the pulse cycles will not
lower the differential pressure to less than 5" or if a
decrease in the efficiency is noted, increase pulse
pressure by 10 psi and reset the OFF time to 40
seconds. Continue to alternate OFF time and pressure
(each time pressure in increased reset OFF time to 40
seconds) by 10-psi increments until the maximum of 100
psi and 20 second OFF time is reached.
4.2.5
When the frequency of the pulse cycles and
higher pulse pressure will not lower the differential
pressure below 5.5, or when cfm drops enough to
decrease ventilation, the filter cartridges should be
replaced. Reset the timer OFF time to 40 seconds, and
set pulse pressure to 70 psi. Refer to Section 6.1.
4.3 Exhauster Damper Setting, Recovery
Applications
4.3.1
Refer to the reclaimer manual for damper
settings when the dust collector is used for recovery.
NOTE: When the collector is used for recovery and
ventilation, there is a separate damper for the reclaimer.
4.4
Exhauster Damper Setting, Room Ventilation
4.4.1
Set the exhaust damper to match the ventilation
requirements (feet per minute) for which the blast
enclosure is designed. This information is on the General
Arrangement Drawing for Clemco supplied blast rooms.
