CDF MODULAR DUST COLLECTOR
Page 2
© 2017 CLEMCO INDUSTRIES CORP.
www.clemcoindustries.com
Manual No. 23478 Rev D
1.4 General
Description
1.4.1
CDF Dust Collector modules come in three body
sizes, CDF-4, CDF-6 & CDF-8. The design of the
modules are the same for each body size. Using the
CDF-4 as the base-line, two racks (4 cartridges) are
added to the top to make a CDF-6 module, which
increases the body height accordingly; four cartridge
racks are added on CDF-8 modules.
1.4.2
Each rack contains two cartridges. Each
cartridge has 252 ft
2
of filter media and is nominally
rated at 500 cfm, rating each rack at 500 ft
2
and 1000 cfm.
CDF-4:
Each module comes with four cartridge racks for
a total of eight cartridges. Each module is nominally
rated at 4000 cfm.
CDF-6:
Each module comes with six cartridge racks, for
a total of twelve cartridges. Each module is nominally
rated at 6000 cfm.
CDF-8:
Each module comes with eight cartridge racks,
for a total of sixteen cartridges. Each module is
nominally rated at 8000 cfm.
1.4.3
All illustrations used in this manual show CDF-8
modules. Except where noted, assembly and operation
are the same regardless of the body size. A typical
general arrangement is shown in Figure 1.
1.5
Theory of Operation
1.5.1
The exhauster draws dust-laden air through the
ducting from the ventilated area, and through the filter
cartridges. As the air passes through the cartridges, dust
accumulates on the outer surfaces. Cleaned air flows
through the center of the cartridges, through the plenum,
exhaust ducting, and out the exhauster. The
accumulated dust is periodically released from the
cartridges by a pulse of compressed air.
1.5.2
CDF
Dust
Collectors utilize reverse-pulse jet
cartridge filters. Compressed air used for the pulse
cleaning is released from the pulse manifold by quick-
release diaphragm pulse valves. At regular timed
intervals, the sequence timer sends a signal to one of
the solenoid valves, releasing a pulse of air, which in
turn opens the respective diaphragm valve. The
momentary opening of the valve releases a burst of
compressed air from the manifold to the clean-air side of
the filter cartridges, thus reversing the air flow to remove
accumulated dust.
1.5.3
Each solenoid and diaphragm valve is opened in
sequence until all cartridges have been cleaned once,
and then the cycle is repeated. If the switch on the
sequence panel is kept in the ON position; the sequence
control panel energizes when the exhauster is turned
ON, and stops when the exhauster is turned OFF.
1.5.4
The timers that control the ON and OFF time of
the air pulse are located in the sequence control panel.
The ON time should never be adjusted. The OFF time
controls the length of time between each pulse. The
shorter the OFF time, the more frequent the pulse
cycles.
1.5.5
The differential-pressure gauge shows the
pressure difference between the dirty and clean side of
the filters. The gauge helps determine the proper setting
for the timer OFF time. Refer to Section 4.2.
2.0
ASSEMBLY AND INSTALLATION
WARNING
Weight and bulk of the components require that
erection and placement of the collector
modules be performed by personnel
experienced with handling structural steel, and
able to safely operate material handling
equipment needed to assemble the collector.
Failure to recognize and avoid hazards
associated with handling structural steel could
result in death or serious injury.
NOTICE
All seams assembled on the job site must be
sealed to weather-tight condition. Use mastic
tape, caulking, or gaskets on all seams, as
shown on the assembly drawings.
2.1 Footing
(Foundation)
2.1.1
The modules must be installed on sound footing.
WARNING
Footings must be designed by a qualified
engineer. Inadequate footing could result in
hazardous shifting of the collector and ducting,
which could result in death or serious injury.
