Donaldson Torit DFO 2-4 User manual

2

Process owners/operators have important responsibilities relating to combustible hazards.
Process owners/operators must determine whether their process creates combustible dust,
fume, or mist. If combustible dust, fume, or mist is generated, process owners/operators should at a
minimum:
• Comply with all applicable codes and standards. Among other considerations, current NFPA standards
require owners/operators whose processes involve potentially combustible materials to have a current
Hazard Analysis, which can serve as the foundation for their process hazard mitigation strategies.
• Prevent all ignition sources from entering any dust collection equipment.
• Design, select, and implement fire and explosion mitigation, suppression, and isolation strategies that
are appropriate for the risks associated with their application.
• Develop and implement maintenance work practices to maintain a safe operating environment, ensuring
that combustible dust, fume, or mist does not accumulate within the plant.
Donaldson recommends process owners/operators consult with experts to insure each of these
responsibilities are met.
As a manufacturer and supplier of Industrial Filtration Products, Donaldson can assist process owners/
operators in the selection of filtration technologies. However, process owners/operators retain all
responsibility for the suitability of fire and explosion hazard mitigation, suppression, and isolation strategies.
Donaldson assumes no responsibility or liability for the suitability of any fire and/or explosion mitigation
strategy, or any items incorporated into a collector as part of an owner/operators hazard mitigation strategy.
Improper operation of a dust control system may contribute to conditions in the work area or facility that
could result in severe personal injury and product or property damage. Check that all collection equipment is
properly selected and sized for the intended use.
DO NOT operate this equipment until you have read and understand the instruction warnings in the
Installation and Operations Manual. For a replacement manual, contact Donaldson Torit.
This manual contains specific precautionary statements relative to worker safety. Read thoroughly and comply
as directed. Discuss the use and application of this equipment with a Donaldson Torit representative. Instruct all
personnel on safe use and maintenance procedures.
Donaldson Company, Inc.
Model Number _____________________________ Serial Number ______________________________
Ship Date _________________________________ Installation Date _____________________________
Customer Name _______________________________________________________________________
Address _____________________________________________________________________________
____________________________________________________________________________________
Filter Type ____________________________________________________________________________
Accessories __________________________________________________________________________
Other________________________________________________________________________________
Data Sheet

Combustible materials such as buffing lint, paper, wood, metal dusts, weld fume, or flammable
coolants or solvents represent potential fire and/or explosion hazards. Use special care when
selecting, installing, and operating all dust, fume, or mist collection equipment when such combustible
materials may be present in order to protect workers and property from serious injury or damage due to a
fire and/or explosion.
Consult and comply with all National and Local Codes related to fire and/or explosion properties of
combustible materials when determining the location and operation of all dust, fume, or mist collection
equipment.
Standard Donaldson Torit equipment is not equipped with fire extinguishing or explosion protection systems.
1
Donaldson Company, Inc.
Description
The Downflo Oval, Models DFO 2-4 and DFO 3-6 are
continuous-duty dust collectors with oval, cartridge-
style filters. The downward airflow design delivers high
filtration efficiency while using less energy. Continuous-
duty means no downtime. The filters are pulse-cleaned in
sequence, one set
at a time, without turning the unit off. Model DFO 2-4 is
two filters wide by two filters high by one filter deep and
Model DFO 3-6 is two filters wide by three filters high by
one filter deep.
Designed to increase the versatility of the unit, standard
options include top, front, and abrasion-resistant inlets,
HEPA and ASHRAE afterfilter packs, Checker board
control panel, and various dust removal options.
Purpose and Intended Use
Downflo Oval collectors are widely used on nuisance
dust where the load to the collector is less than 2
grains per cubic foot. Some typical applications include
abrasive blasting, grinding, pharmaceuticals, powder
paint applications, sand handling, and welding. Each
application is different and selecting the correct filter
cartridge for the application and type of dust collected is
important.
• Forallambient,extremelyne,andnon-brousdust,
use Ultra Web®filter cartridges which offer high
efficiency and performance on fine particulate.
• Forbrousdust,useacartridgewithanopen-pleat
design, such as Fibra-Web®.
• Operationsinvolvinghightemperatureandhigh
humidity may require special attention. Temperature,
moisture content, and chemistry issues may require
custom collector design. Appropriate cartridge
options are available from Donaldson Torit.
• Hygroscopicdustsuchasfertilizer,salt,andsugar
should be handled under a controlled, low humidity
environment. Contact Donaldson Torit for filter
cartridge selection.
• Flammableorexplosivedustmayrequirecustom
collector design options and special cartridges.
Contact Donaldson Torit for design assistance.
• Applicationswithhighhydrocarbonorhighoil
content may require special treatment or filter media.

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Donaldson Company, Inc.
Operation
During normal operation, dust-laden air enters the unit
through the dirty-air inlet. Airflow is directed downward
through the collector and heavier particulate falls
directly into the hopper. The cartridges remove fine
particulate and clean, filtered air passes through the
cartridge to the clean-air plenum and discharges through
the clean-air outlet.
Unit Operation
filter
cleaning
system
diaphragm
valve
compressed-air
supply
hopper
Filter Cleaning Operation
dirty-air
inlet
clean-air
outlet
clean-air
outlet
filter cartridges
clean-air
plenum
Normal Operation
dirty-air
inlet
optional
clean-air
outlet
optional
clean-air
outlet
Filter cleaning is completed using pulse-jet technology.
A solenoid and air diaphragm valve aligned to each filter
provides the pulse cleaning. The cleaning sequence
starts at the top filter and continues down through each
filter. Remove, inspect, or change the filter cartridges
from outside the unit by removing the filter access cover
and sliding the filter out.

Downflo Oval, DFO 2-4 and 3-6
4
Inspection on Arrival
1. Inspect unit on delivery.
2. Report any damage to the delivery carrier.
3. Request a written inspection report from the Claims
Inspector to substantiate any damage claim.
4. File claims with the delivery carrier.
5. Compare unit received with description of product
ordered.
6. Report incomplete shipments to the delivery carrier
and your Donaldson Torit representative.
7. Remove crates and shipping straps. Remove loose
components and accessory packages before lifting
unit from truck.
8. Check for hardware that may have loosened during
shipping.
9. Use caution removing temporary covers.
Installation Codes and Procedures
Codes may regulate recirculating
filtered air in your facility.
Consult with the appropriate authorities
having jurisdiction to ensure compliance
with all national and local codes regarding
recirculating filtered air.
Safe and efficient operation of the unit depends on
proper installation.
Authorities with jurisdiction should be consulted
before installing to verify local codes and installation
procedures. In the absence of such codes, install unit
according to the National Electric Code, NFPA No.
70-latest edition and NFPA 91 (NFPA 654 if combustible
dust is present).
A qualified installation and service agent must complete
installation and service of this equipment.
All shipping materials, including shipping covers, must be
removed from the unit prior to, or during unit installation.
Failure to remove shipping
materials from the unit will
compromise unit performance.
Inspect unit to ensure all hardware is properly installed
and tight prior to operating collector.
Installation
Site suitability must account
for wind, seismic zone, and
other live-load conditions when selecting the
location for all units.
Codes may regulate acceptable locations for
installing dust collectors. Consult with the
appropriate authorities having jurisdiction to
ensure compliance with all national and local
codes regarding dust collector installation.
Site Selection, Grade-Mounted Units
1. The unit can be located on a reinforced concrete
foundation or rooftop.
2. Provide clearance from heat sources and
interference with utilities when selecting the location
for suspended units.
3. Portable units require no special installation
accommodations.
When outdoor locations are selected, always mount
motors with drain holes pointed down for proper
drainage of moisture.
Unit Location
Donaldson Torit equipment is not
designed to support site-installed
ducts, interconnecting piping, or electrical
services. All ducts, piping, or electrical
services supplied by others must be adequately
supported to prevent severe personal injury
and/or property damage.
When hazardous conditions or materials are
present, consult with local authorities for the
proper location of the collector.
Foundation must be capable of supporting the entire
weight of the unit, plus the weight of the collected
material, piping, and ductwork.
Prepare the foundation in the selected location. Install
anchor bolts to extend a minimum of 1 3/4-inches above
foundation.
Locate the collector to ensure easy access to
electrical and compressed-air connections and routine
maintenance.
NOTICE

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Donaldson Company, Inc.
If explosion protection devices are part of the system,
locate the collector in accordance with local code
requirements (Example: NFPA 654). These codes may
require units handling combustible dust be located either
outside or against an exterior wall.
Rigging Instructions
Suggested Tools & Equipment
Clevis Pins and Clamps Lifting Slings
Crane or Forklift Pipe Sealant
Drift Pins Pipe Wrenches
Drill and Drill Bits Screwdrivers
End Wrenches Socket Wrenches
Adjustable Wrench Spreader Bars
Torque Wrench (inch/lbs, 9/16-in Socket)
Hoisting Information
Failure to lift the collector
correctly can result in severe
personal injury or property damage.
Use appropriate lifting equipment and adopt
all safety precautions needed for moving and
handling the equipment.
A crane or forklift is recommended for
unloading, assembly, and installation of the
collector.
Location must be clear of all obstructions, such
as utility lines or roof overhang.
Use all lifting points provided.
Use clevis connectors, not hooks, on lifting slings.
Use spreader bars to prevent damage to unit’s casing.
Check the Specification Control drawing for weight
and dimensions of the unit and components to ensure
adequate crane capacity.
Allow only qualified crane operators to lift the equipment.
Refer to applicable OSHA regulations and local codes
when using cranes, forklifts, and other lifting equipment.
Lift unit and accessories separately and assemble after
unit is in place.
Use drift pins to align holes in section flanges during
assembly.
Electrical Wiring
Electrical work during installation
must be performed by a qualified
electrician and comply with all applicable
national and local codes.
Turn power off and lock out electrical
power sources before performing service or
maintenance work.
Do not install in classified hazardous
atmospheres without an enclosure rated for
the application.
All electrical wiring and connections, including electrical
grounding, should be made in accordance with the
National Electric Code (NFPA No. 70-latest edition).
Check local ordinances for additional requirements that
apply.
The appropriate wiring schematic and electrical rating
must be used. See unit’s rating plate for required voltage.
If the unit is not furnished with a factory-mounted
disconnect, an electric disconnect switch having
adequate amp capacity shall be installed in accordance
with Part IX, Article 430 of the National Electrical Code
(NFPA No. 70-latest edition). Check unit’s rating plate for
voltage and amperage ratings.
Refer to the wiring diagram for the number of wires
required for main power wiring and remote wiring.

Downflo Oval, DFO 2-4 and 3-6
6
Do Not lift with
this orientation
angle not to
exceed 30°
from vertical
(min 60°
from horizontal)
1. Lift cabinet.
2. Apply sealant to hopper flange.
3. Fasten hopper to cabinet.
4. Assemble legs and cross braces.
5. Lift unit and hopper into position
over legs and lower slowly.
6. Fasten legs to unit securely.
7. Lift assembled unit to location.
8. Support and level unit.
9. Tighten all fasteners.
10. Remove crane.
Typical Installation
Typical Installation

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Donaldson Company, Inc.
Standard Equipment
Standard equipment consists of a collector cabinet,
hopper, and legs. Basic assembly starts by attaching
the hopper to the cabinet, then attaching the legs. A
detailed instruction drawing, shipped with each collector,
provides specific assembly and lifting instructions.
Hopper Assembly
Assemble the standard or the optional steep-sided
hopper following these instructions.
1. Stand the hopper on the discharge end.
2. Apply 1/4-in diameter rope-type sealant around the
top flange toward the inside edge
of the bolt pattern.
3. Lift the collector and position over the hopper and
lower slowly.
4. Use drift pins to align holes.
5. Secure collector to hopper using
3/8-16 x 1 1/4-in bolts, flat washers, and nuts. Tighten
all hardware securely. See Hopper Installation
below.
hopper
3/8-16 x 1 1/4-in bolt
3/8-in flat washer
3/8-in flat washer
3/8-in lock washer
3/8-16 hex nut
1/4-in rope-type sealant
Hopper Installation

Downflo Oval, DFO 2-4 and 3-6
8
All Leg Bolt Details:
Hex Bolt
flat washer
lock washer
hex nut
Leg and Cross Brace Assembly
Leg Assembly
Leg sets are designed for standard height collectors
and are rated as shown in the Rating and Specification
Information. Reference the drawing shown below and
the leg assembly drawing shipped with the leg set for
proper location and assembly.
1. Position and assemble legs and cross braces as
shown in Leg and Cross Brace Assembly.
2. Lift the cabinet and hopper assembly into position
over the legs and lower slowly.
3. Use drift pins to align the holes in the collector with
the holes in the legs. Attach each leg as shown using
the hardware supplied. Do not tighten hardware at
this time.
4. Recheck the position of the leg sets and cross
braces.
5. Using a crane, lift the assembled unit onto the
anchor bolts. Fasten each leg pad to the anchor
bolts using flat washers, lock washers, and hex nuts
provided by others. Do not tighten hardware at this
time.
6. Level unit. Tighten all hardware on legs, cross
braces, and foundation anchors.
Tighten all hardware before
removing crane to prevent
personal injury or property damage.
NOTICE

Downflo Oval, DFO 2-4 and 3-6
10
compressed-air
supply line*
automatic
condensate
valve*
bleed-type
air filter*
regulator*
air supply
to manifold*
solenoid
electrical
connection*
manifold
solenoid
enclosure
diaphragm valve
hopper
blower fan
Magnehelic
gauge*
120-Volt blower
motor starter*
solid-state
timer
safety
exhaust
valve*
Notes: 1. * Not included with standard unit.
2. Sprinkler taps not shown.
power supply
disconnect
switch*
Compressed Air and Component Installation

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Donaldson Company, Inc.
Preliminary Start-Up Check
Instruct all personnel on safe use and maintenance
procedures.
Electrical work during installation
must be performed by a qualified
electrician and comply with all applicable
national and local codes.
Turn power off and lock out electrical
power sources before performing service or
maintenance work.
Turn compressed air supply OFF and bleed
lines before performing service or maintenance
work.
Check that the collector is clear and free of all
debris before starting.
Do not install in classified hazardous
atmospheres without an enclosure rated for
the application.
Optional fans over 600 lbs must be
independently supported.
1. Check all electrical connections for tightness and
contact.
2. Motor and fan should be wired for clockwise rotation
when viewed from the back of the motor.
To reverse rotation, single-phase power supply:
Follow manufacturer’s instructions on the motor’s
nameplate.
To reverse rotation, three-phase power supply:
Turn electrical power OFF at source and switch any
two leads on the motor junction box.
Do not interchange a power lead
with the ground wire. Severe
damage or personal injury may result.
3. All access panels should be sealed and secure.
4. Check that the dust container is properly sealed and
clamped.
5. Check that exhaust damper is set to the fully-closed
position.
6. Check and remove all loose items in or near the inlet
and outlet of the unit.
7. Check that all remote controls and solenoid
enclosures (if applicable) are properly wired and all
service switches are in the OFF position.
8. Check that all optional accessories are installed
properly and secured.
9. Turn power ON at source.
10. Turn the compressed-air supply ON. Adjust pressure
regulator for 60-psig.
11. Turn blower fan motor ON.
Do not look into fan outlet to
determine rotation. View the fan
rotation through the back of the motor.
Check that the exhaust plenum is free of tools
or debris before checking blower/fan rotation.
Stand clear of exhaust to avoid personal injury.
12. Adjust airflow with the exhaust damper.
Excess airflow can shorten filter
life, cause electrical system
failure, and blower motor failure.
NOTICE

Downflo Oval, DFO 2-4 and 3-6
14
This Page Intentionally Left Blank

15
Donaldson Company, Inc.
Maintenance Information
Instruct all personnel on safe use and maintenance
procedures.
Use proper equipment and adopt
all safety precautions needed
for servicing equipment. Electrical service
or maintenance work must be performed by
a qualified electrician and comply with all
applicable national and local codes.
Turn power off and lock out electrical
power sources before performing service or
maintenance work.
Do not install in classified hazardous
atmospheres without an enclosure rated for
the application.
Turn compressed air supply OFF and bleed
lines before performing service or maintenance
work.
Do not set compressed-air
pressure above 60-psig.
Component damage can occur.
All compressed air components must be sized
to meet the maximum system requirements of
60-psig supply pressure.
The compressed-air supply must be oil
and moisture free. Contamination in the
compressed air used to clean filters will result
in poor cleaning, cleaning valve failure, or poor
collector performance.
Purge compressed air lines to remove debris
before connecting to the unit’s compressed air
manifold.
Operational Checklist
1. Monitor the physical condition of the collector and
repair or replace any damaged components.
Routine inspections will minimize downtime and
maintain optimum system performance. This
is particularly important on continuous-duty
applications.
Periodically check the compressed air components
and replace compressed air filters.
Drain moisture following the manufacturer’s
instructions. With the compressed air supply ON,
check the cleaning valves, solenoid valves, and
tubing for leaks. Replace as necessary.
2. Monitor pressure drop across filters.
Abnormal changes in pressure drop indicate a
change in operating conditions and possibly a fault
to be corrected. For example, prolonged lack of
compressed air will cause an excess build-up of dust
on the filters resulting in increased pressure drop.
Cleaning off-line with no flow usually restores the
filters to normal pressure drop.
3. Monitor exhaust.
4. Monitor dust disposal.
Filter Removal and Installation
Use proper safety and protective
equipment when removing
contaminants and filters.
Dirty filters may be heavier than they appear.
Use care when removing filters to avoid
personal injury.
Filter Removal
1. Turn power to unit OFF.
2. Start at the top access port.
3. Remove access cover. For units without Bag-In/Bag-
Out: remove access cover by lifting latch handle
and lifting cover to remove from yoke. For units with
Bag-In/Bag-Out: lift up access cover handle and
while pushing in on cover, slide access cover to the
side 1-inch to remove access cover.
If the access cover clamp fails to operate smoothly,
apply WD-40®to the riveted pivot points and to the
clamp rod where it passes through the outside of the
cover. Wipe off overspray.
4. Break the seal between the filter cartridge and the
sealing surface.
WD-40® is a registered trademark of WD-40 Company.
NOTICE

17
Donaldson Company, Inc.
5. Slide the filter out the access port along the
suspension yoke and dispose of properly.
6. Clean the sealing surface with damp cloth.
Clean dust from gasket sealing
area to ensure a positive filter
gasket seal.
7. Check for an accumulation of dust in the storage
area and empty as necessary.
Filter Installation
1. Slide the new filter cartridges onto each suspension
yoke.
Note: Insert the filter gasket end first.
2. Wipe cover gaskets clean and replace covers by
attaching cover to yoke hook and firmly latching
cover handle.
Replace access covers carefully by securing them
using the handle provided. Keep fingers away from
the sealing surface to avoid pinching.
Check that access covers
are seated and seal properly.
Gaskets must be compressed to ensure an
airtight seal.
3. Turn electrical power and compressed air supply ON
before starting unit.
Dust Disposal
1. Turn unit OFF and empty dust container as necessary
to minimize dust in the hopper.
2. If the optional 55-gallon drum attachment is used,
empty when drum is 2/3 full.
3. If optional slide gate is used, close gate before
servicing drum.
4. Reinstall drum and open gate (if applicable).
Compressed Air Components
Do not set compressed-air
pressure above 100-psig.
Component damage can occur.
1. Periodically check the compressed air components
and replace compressed-air filter.
2. Drain moisture following the manufacturer’s
instructions.
3. With the compressed-air supply ON, check the
cleaning valves, solenoid valves, and tubing for
leaks. Replace as necessary.
NOTICE
NOTICE
NOTICE