Donaldson Torit AT-3000 User manual

This is the safety alert symbol. It is used to alert you to potential personal injury hazards.
Obey all safety messages that follow this symbol to avoid possible injury or death.
This manual is property of the owner. Leave with the unit when set-up and start-up are complete. Donaldson Company reserves the right to
change design and specifications without prior notice.
Illustrations are for reference only as actual product may vary.
Ambient Collection System
AT-3000
Installation and Operation Manual
Installation, Operation, and Service Information
IOM 7539401 (ENG)
Revision 7
English
Master Language

APPLICATION OF DUST CONTROL EQUIPMENT
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.
When combustible materials are present you must consult with an expert in fire extinguishing and/or
explosion protection systems, who is also familiar with the local codes, for support and guidance on the
selection and installation of an appropriate fire and/or explosion protection system.
DO NOT allow sparks, cigarettes or other burning objects to enter the hood or duct of any dust, fume, or mist
collection equipment as these may initiate a fire or explosion of any combustible materials accumulated in
the collector.
Portions of dust, mist, and fume-collection equipment, including the clean- and dirty-air plenums may be
considered “OSHA Confinded Spaces.” Refer to the appropriate OSHA regulations to determine if a specific
installation should be considered a confined space and if a permit program is required.
Recirculating filtered air in your facility can be a hazard. Consult with OSHA to ensure compliance with all
codes regarding recirculating filtered air.
Improper operation of a dust, fume, or mist 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 dust, fume,
or mist collection equipment is properly selected, installed, and operated for its intended use.
This manual contains specific precautionary statements relative to worker safety. Read this manual thoroughly and
comply as directed. Instruct all personnel on the safe use and maintenance procedures related to this equipment.
Discuss any questions on the application, use, or maintenance of this equipment with a Donaldson Torit representative.
For optimum collector performance, use only Donaldson Torit replacement parts.
Donaldson Company, Inc.
Model Number _____________________________ Serial Number ______________________________
Ship Date _________________________________ Installation Date _____________________________
Customer Name _______________________________________________________________________
Address _____________________________________________________________________________
____________________________________________________________________________________
Filter Type ____________________________________________________________________________
Accessories __________________________________________________________________________
Other________________________________________________________________________________
Data Sheet

DANGER indicates a hazardous situation which, if not avoided, will result
in death or serious injury.
WARNING indicates a hazardous situation which, if not avoided, could
result in death or serious injury.
CAUTION, used with the safety alert symbol, indicates a hazardous
situation which, if not avoided, could result in minor or moderate injury.
NOTICE is used to address practices not related to personal injury that
may result in damage to equipment.
Ambient Collection System, AT-3000
i
Magnehelic® and Photohelic® are registered trademarks of Dwyer Instruments, Inc.
Contents
Description................................................................................1
Purpose and Intended Use ....................................................1
Operation...................................................................................2
Inspection on Arrival...............................................................3
Installation Codes and Procedures ......................................3
Installation.................................................................................3
Site Selection........................................................................3
Unit Location .........................................................................3
Rigging Instructions.................................................................4
Electrical Wiring.......................................................................4
Standard Equipment................................................................5
Ceiling Installation................................................................5
Electrical Connection ..........................................................6
Compressed Air Installation...............................................7
Solid-State Timer Installation.................................................9
Preliminary Start-Up Check .................................................11
Maintenance Information.....................................................12
Operational Checklist ........................................................12
Filter Removal and Installation.........................................12
Dust Disposal ......................................................................13
Compressed Air Components...........................................14
Split Taper™ Bushing Mounting Instructions ...............15
Optional Equipment................................................................16
Hopper Assembly ...............................................................16
Magnehelic®Gauge ..........................................................17
Photohelic®Gauge.............................................................18
Delta P Control....................................................................20
Delta P Plus Control ..........................................................21
Solenoid Muffler.................................................................22
Sprinkler Head ....................................................................22
Troubleshooting......................................................................23
Service Notes.........................................................................25

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 AT-3000 ambient collection system is a continuous-
duty collector with 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 two at a time, without
turning the unit off. The compact size, coupled with
large-volume air handling capabilities allow this unit to
be placed in a variety of sites previously inaccessible to
high-efficiency dust collectors. Ceiling- or wall-mount,
the AT-3000 is designed for multiple-unit applications
when source capture is not practical.
Designed to increase the versatility of the unit, standard
options include Magnehelic or Photohelic gauges,
solenoid mufflers, and a hopper attachment for moderate
to heavy load applications.
Purpose and Intended Use
Misuse or modification of this
equipment may result in personal
injury.
Do not misuse or modify.
The AT-3000, designed for general ventilation of weld
fume, is capable of handling 2,500 to 3,000 cfm. The AT-
3000 is ideal when source collection is not practical.
These collectors are designed for multiple-unit
installations, positioned according to specific application
parameters. A typical multiunit installation arranges the
units so there is continual air movement, created by the
exhaust of the one collector blowing toward the inlet
of another collector. If there is no air movement, fume
clouds will form. Therefore, single-unit installations are
not recommended.
Note that welding on oil-laden parts or heavy production
welding, especially with processes that use a flux
coating or core, will shorten filter life. The cartridge plugs
with the soot from the burned oil or flux and is difficult to
pulse clean.

Ambient Collection System, AT-3000
2
clean-air
outlet
clean-air plenumfilter cartridgesdirty-air plenum
dirty-air
inlet
compressed-air
supply
blower assembly
diaphragm valve
Normal Operation
Filter Cleaning Operation
Unit Operation
Operation
During normal operation, dust-laden air enters the unit
through the dirty-air inlet. Airflow is directed downward
through the filter cartridges and collects on the outside
surfaces of the filter. 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.
Filter cleaning is completed using pulse-jet technology.
A solid-state timer energizes a solenoid valve, causing
the corresponding diaphragm valve to send a pulse of
compressed air through the filter cartridge. This pulse
forces the accumulated dust to fall from the cartridge
and into the storage area. At the end of the pulse, the
diaphragm closes, and the timer sequences to the next
valve in the system.

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Donaldson Company, Inc.
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 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 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 selection 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
1. The unit can be suspended or hung from overhead
supports. The supports must be adequate to carry
the live load of the unit and installation performed to
reduce sway or vibration to the unit.
2. Provide clearance from heat sources and
interference with utilities when selecting the location
for suspended units. Reference the Specification
Control Drawing shipped with the unit.
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 or roof support must be capable of supporting
the entire weight of the unit, plus the weight of the
collected material, piping, and ductwork.
Locate the collector to ensure easy access to electrical
and compressed-air connections, and routine
maintenance.
If explosion protection devices are part of the system,
locate the collector in accordance with the local code
requirements (Example: NFPA 654).

Ambient Collection System, AT-3000
4
Rigging Instructions
Suggested Installation Tools & Equipment
Clevis Pins and Clamps Lifting Slings
Crane or Forklift Pipe Sealant
Pipe Wrenches Drill and Drill Bits
Screwdrivers End Wrenches
Socket Wrenches Spreader Bars
Large Crescent Wrench
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 units 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.
Electrical Wiring
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.
All electrical wiring and connections, including electrical
grounding, should be made in accordance with the
National Electric Code and 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
and 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.

5
Donaldson Company, Inc.
Standard Equipment
Ceiling Installation
All ceiling supports must be sized to accommodate the
entire weight of the unit plus the weight of the collected
material.
Install unit to reduce sway or
vibration.
1. Use four ASTM-A36 or greater, 5/8-in threaded rods
to suspend the unit. Thread a 5/8-in hex nut onto
each rod at least 1 1/2-in.
2. Raise unit into position. Place a flat washer on each
rod before placing the rod through the mounting or
suspension bracket.
5/8-in threaded rod
5/8-in hex nut
5/8-in flat washer
5/8-in lock nut
5/8-in flat washer
Ceiling Installation
3. Place another flat washer and 5/8-in lock nut on
the threaded rod under the mounting or suspension
bracket. Allow 1/2-in of threaded rod to protrude
through each nut.
4. Level unit in all directions by tightening the bottom
lock nut.
5. When unit is level, lower the top nut to the top
washer and bracket. Hold the bottom lock nut and
tighten the top nut securely.

Ambient Collection System, AT-3000
6
Electrical Connection
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.
AT-3000 ambient collectors must be equipped with a
customer-supplied safety disconnect with short circuit
protection, contactor, and overload protection. The unit
is equipped with two solenoid valves (typically 115V) that
clean the filters.
The DIN connector of the solenoid valve has two power
leads and a ground connection.
1. Mount the control box and starter switch in a
convenient, accessible location.
2. Install conduit and wire to the unit.
3. Make the wiring connections to the fan motor,
starter, solid-state timer, solenoid valves, and control
switch according to the wiring diagram located
inside the control box and the instructions on the
motor decal. In grounded systems, connect neutral to
control box to Terminal L2 on the terminal board.
All electrical components must be
sized for the supply voltage and
motor horsepower.
manifold
solenoid
valve
diaphragm valve
Solenoid Valve

7
Donaldson Company, Inc.
Compressed Air Installation
Turn compressed-air supply OFF
and bleed lines before performing
service or maintenance work.
A safety exhaust valve should be used to
isolate the compressed air supply. The safety
exhaust valve should completely exhaust
downstream pressure when closed and include
provisions to allow closed-position locking.
Do not set compressed-air
pressure above 100-psig.
Component damage can occur.
All compressed air components must be sized
to meet the maximum system requirements of
90-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.
1. Remove the plastic pipe plug from the unit’s air
manifold and connect the compressed-air supply
line. Use thread-sealing tape or pipe sealant on all
compressed-air connections.
2. Install a customer-supplied shut-off valve, bleed-
type regulator with gauge, filter, and automatic
condensate valve in the compressed-air supply line.

Ambient Collection System, AT-3000
8
Compressed Air Installation
compressed
air supply
condensate filter*
bleed-type
air filter*
compressed-air
regulator* solid-state timer
optional pulse
control switch**
blower motor
starter*
Magnehelic
gauge
disconnect
switch*
incoming
power supply
compressed-air valve*
compressed-air
connection
either side
fire sprinkler
installed by
others
shut-off valve*
*customer-supplied
** can be a Photohelic, toggle, ON/OFF, or other control-type switch
Turn compressed-air supply OFF
and bleed lines before performing
service or maintenance work.

9
Donaldson Company, Inc.
Solid-State Timer Installation
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 installation, service,
or maintenance work.
Do not install in classified hazardous
atmospheres without an enclosure rated for
the application.
The unit is equipped with 115-V solenoid valves that
control the pulse-cleaning valves, which clean the filters.
Wire the solenoids to the solid-state timer following
the wiring diagram supplied with the unit. Filter life and
cleaning operation will be affected if not wired correctly.
Pulse Control Switch, 1TGS
Closing this switch applies power to the timer control
circuit, which operates in parallel with the blower
starter’s low-voltage coil. On blower start-up, power is
supplied to the timer and the preset OFF time is initiated.
At the end of the OFF time, the timer energizes the
corresponding solenoid valve to provide the ON time
cleaning pulse for one diaphragm valve and then steps
to the next until all filters have been cleaned. The cycle
continues until the pulse-control switch opens. Check
that the program pin on the solid-state timer board is set
to the number of solenoid valves controlled.
Input
Order dependent. See wiring diagram.
Output Solenoids
The load is carried and turned ON and OFF by the 200
watt maximum-load-per-output solid-state switch.
Pulse ON Time
Factory set at 100-milliseconds, or 1/10-second.
Do not adjust pulse ON time
unless the proper test equipment
is available. Too much or too little ON time can
cause shortened filter life.
Pulse OFF Time
Factory set at 10-seconds, adjustable from 1 to
1.5-second minimum to maximum 60 to 66-second.
Operating Temperature Range
-20° F to 130° F
Transient Voltage Protection
50 kW transient volts for 20-millisecond duration once
every 20 seconds, 1% duty cycle.
Solenoid Valves
Order dependent. See wiring diagram.
Compressed-Air
Set compressed-air supply at 90-psig. The timer is
factory set to clean one set of filters every 10-seconds.
Do not increase supply pressure
above 100-psig. Component
damage can occur.

Ambient Collection System, AT-3000
10
Output N
Output 2
Output 1
Power Input
ON
OFF
ON
OFF
ON
OFF
ON
OFF
Pulse ON-time for all outputs
See Specifications
Adjustable OFF-time
Between two pulses
Typical Operating Logic Diagram
Fan StarterDisconnect
1FU
2FU
3FU
208-230V
60 Hz/3Ph
IL1
IL2
IL3
1M 1OL 1T1
1T2
1T3
230V
115V
H1 H2
H3 H4
X1 X2
stop
start
1M
1M 1TGS
fan
motor
pressure
switch
solenoid
valves
L1 L2
L1
L2
L3
Wiring by others
Wiring by factory
1OL
110V
12V
3
2
1
COMM
Control Box
Timer Board
junction
box
115-Volt
Power Supply
Typcial Solid-State Timer Wiring

11
Donaldson Company, Inc.
9. Turn the compressed-air supply ON. Adjust pressure
regulator 90-psig.
10 Check the operation of the solenoid valves by turning
the pulse control switch ON. The solenoid valves
should open and close continuously at preset ON
and OFF times.
11. Turn the 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.
Preliminary Start-Up Check
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.
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 output-side of the fan-motor starter.
Do not interchange a power lead
with the ground wire. Severe
personal injury or equipment damage may
result.
3. All access panels should be sealed and secure.
4. Check that the storage container is sealed, if
equipped.
5. Check for and remove all loose items in or near the
inlet and outlet of the unit.
6. Check that all remote controls are wired into the
control system, and all service switches are in the
OFF position.
7. Check that all optional accessories are installed
properly and secured.
8. Turn power ON at source.

Ambient Collection System, AT-3000
12
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 100-psig.
Component damage can occur.
All compressed air components must be sized
to meet the maximum system requirements of
90-100 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. Remove the filter access covers by turning the knob
counterclockwise.
3. Break the seal between the filter cartridge and the
sealing surface.
4. Slowly rotate the cartridge 1/2-turn to remove dust
that may have accumulated on the top of the filter.
5. Slide the filter out the access port along the
suspension yoke.
6. Dispose of properly.

13
Donaldson Company, Inc.
7. Clean the sealing surface with damp cloth.
Clean dust from gasket sealing
area to ensure a positive filter
gasket seal.
8. Check for an accumulation of dust in the storage
area and empty as necessary.
Filter Installation
1. Slide the new filter cartridge onto each suspension
yoke.
Insert the filter, gasket end first.
2. Wipe cover gaskets clean and replace covers by
turning the knob clockwise.
Tighten access covers securely
by hand. Gaskets must be
compressed to seal properly.
Inspect and replace any covers with damaged
or missing gaskets. Failure to do may result in
leakage in the collector.
3. Turn electrical power and compressed air supply ON
before starting unit.
suspension yoke
filter
cartridges
filter access cover
Filter Removal and Replacement
Dust Disposal
Standard Unit
1. Open the filter-access covers and remove the filter
cartridges. See Filter Removal and Replacement.
2. Remove the dust with a dry sweeper or brush and
dispose of properly.
3. Replace filters and close filter-access covers
securely. See Filter Removal and Replacement.
4. Turn electrical power and compressed air supply ON
before starting unit.

Ambient Collection System, AT-3000
14
Hopper Unit
1. Open the filter-access covers and remove the filter
cartridges. See Filter Removal and Replacement.
2. Sweep or brush hopper walls.
3. Replace filters and close filter-access covers
securely. See Filter Removal and Replacement.
4. Remove the dustpans and dispose of dust properly.
Empty and clean the dust pans every other day in
heavy dust-load applications, and every week in
light-to-medium applications.
Full dust pans can weigh up to
45-lbs. Use care when removing.
5. Inspect the gasket for wear that could cause a leak
during operation. Replace if necessary.
6. Clean the baffle with a dry brush or dry putty knife.
7. Inspect the draw latches for breaks, deformities, or
wear and replace as necessary.
8. Reinstall the dust pans.
9. Turn electrical power and compressed air supply ON
before starting unit.
Compressed Air Components
Turn compressed-air supply OFF
and bleed lines before performing
service or maintenance work.
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.
neoprene gasket
dust pan
filter cartridge
Dust Disposal

15
Donaldson Company, Inc.
Split Taper™ Bushing Mounting Instructions
Many fans are furnished with split taper bushings for
mounting the impeller to the shaft. When properly
assembled, the bushings grip the hub with a positive
clamping action.
1. Bushel barrel and bore of impeller are tapered to
ensure concentric mounting and a true running
propeller.
2. Capscrews, when tightened, lock bushing in
propeller. Use special plated capscrews and nylock
nuts.
Tighten capscrews gradually and evenly with wrench
similar to mounting an automobile wheel. Rotate a
quarter turn on each capscrew successively until
all capscrews are tight. These capscrews force the
taper bushing into the hub, which in turn compresses
the bushing onto the shaft. This makes a positive
clamping fit. The torque must not exceed the value
specified in the table.
Impeller Assembly Removal
1. Remove all capscrews from impeller and hub
assembly.
2. Insert capscrews into the threaded holes in the
bushing flange.
3. Tighten each bolt in quarter of a turn increments to
push the impeller off the bushing. This forces the
bushing loose from the propeller hub and releases
the compression so that the entire assembly will
slide from the shaft.
4. Pull the bushing off the shaft.
Note: If the assembly has been in place sometime
it may be necessary to use a wheel puller to remove
the bushing. Never use a wheel puller on the
impeller.
3. Bushing is split so that when the locking capscrews
force bushing into tapered bore, the bushing grips
the shaft with a positive clamping fit. This will
withstand vibration and heavy loads without being
loosened.
4. Impeller and bushing assembly is keyed to the shaft
and held in place by compression, which adds
driving strength.
Note: Before assembly, ensure shaft and
keyway are clean and smooth. Check key size with
both shaft and bushing keyway.
5. To assemble, insert the capscrews through the
clearance holes in the bushing and install bushing
loosely into the impeller. Do not press or drive. Start
capscrews by hand, turning them just enough to
engage threads in the nylock nut. Do not use a
wrench at this time. The bushing should be loose
enough in the propeller to move freely. Slide impeller
and bushing assembly onto shaft, allowing adequate
clearance for shaft end play to prevent friction. Fit
key into keyway. Do not force impeller and bushing
onto shaft. If it does not go on easily, check shaft,
bushing, and key sizes once again.
Do not attempt to pull bushing
flange flush with hub end.
There should be a clearance which varies
approximately 3/16-in to 1/4-in with the busing
size when tightened. This is not a locating
dimension.
Bushing No. Bolt Size Torque Ft-Lbs
QT/QH/L/H 1/4-20 7-1/2
Split Taper
Bushing
C
A
EDB
A. External key, except G, H and Idler Bushings
B. Bushing barrel and Product bore are tapered
C. Bushing cap screws
D. Bushing barrel is split (except idler bushings)
E. Removal holes are threaded, installation holes are not
Hub of blower wheel
or pulley
Split Taper Bushing Installation
Browning®is a registered trademark and Split Taper™is a tradename
of Emerson Power Transmission Manufacturing, L.P.

Ambient Collection System, AT-3000
16
1/4-in diameter
rope-type sealant
1/4-20 UNC x 3/4-in
thread-forming bolts
neoprene gasket
dust pan
Hopper Assembly
Optional Equipment
Hopper Assembly
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.
Standard units ship with a standard panel on the bottom
of the dirty-air plenum. If the optional hopper is ordered,
the unit is shipped with a protective shipping cover on
the dirty-air plenum.
1. Remove the bottom panel or protective shipping
cover from the dirty-air plenum.
2. Apply 1/4-in diameter, rope-type sealant to the
hopper flange.
3. Using a crane or forklift, lift the hopper into position
under the unit and secure with thirty-six 1/4-20 UNC x
3/4-in thread-forming screws supplied.
Do not over tighten thread-
forming screws.
4. Remove lifting equipment.

17
Donaldson Company, Inc.
Magnehelic®Gauge
The Magnehelic is a differential pressure gauge used to
measure the pressure difference between the clean- and
dirty-air chambers and provides a visual display of filter
change requirements. The high-pressure tap is located in
the dirty-air plenum and the low-pressure tap is located
in the clean-air plenum.
1. Choose a convenient, accessible location on or near
the unit for mounting that provides the best visual
advantage.
2. Plug the pressure ports on the back of the gauge
using two, 1/8-in NPT pipe plugs supplied. Install two,
1/8-in NPT male adapters supplied with the gauge
into the high- and low-pressure ports on the side of
the gauge.
3. Attach the mounting bracket using three, #6-32 x 1/4-
in screws supplied.
4. Mount the gauge and bracket assembly to the
supporting structure using two, self-drilling screws.
5. Thirty-five feet of plastic tubing is supplied and must
be cut in two sections. Connect one section of tubing
from the gauge’s high-pressure port to the pressure
fitting located in the dirty-air plenum. Connect
remaining tubing from the gauge’s low-pressure
port to the fitting in the clean-air plenum. Additional
tubing can be ordered from your representative.
6. Zero and maintain the gauge as directed in the
manufacturer’s Operating and Maintenance
Instructions provided.
1/8-in NPT x 90°
male elbow
clean-air plenum pressure
tap location 1/8-in NPT adapter
1/8-in NPT adapter
plenum tap location
3/8-in flat washer
1/8-in NPT coupling
mounting bracket
#6-32 x 1/4-in mounting screws
support structure
mounting surface
Magnehelic gauge
high-pressure port
low-pressure port
two, 1/8-in NPT
adapters
plastic tubing
two, 1/8-in NPT pipe plugs
two, self-drilling screws
1/8-in NPT x 90° male elbow
dirty-air plenum pressure tap location
3/8-in flat washer
1/8-in NPT adapter
1/8-in NPT x 90° elbow
static pressure tee
Magnehelic Gauge Assembly