Donaldson Torit Mini-Mist Air Filter MM 500 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.
Mini-Mist Air Filter
MM 500 and MM 1200
Installation and Operation Manual
Installation, Operation, and Service Information
IOM 7547201
Revision 5

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 Confined 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.
NOTICE
Mini-Mist, MM 500 and MM 1200
i
Minihelic®is a registered trademarks of Dwyer Instruments, Inc.
Contents
Description................................................................................1
Purpose and Intended Use.....................................................1
Rating and Specification Information...................................2
Operation...................................................................................3
Inspection on Arrival...............................................................4
Installation Codes and Procedures ......................................4
Site Selection, Grade-Mounted Units...............................4
Site Selection, Ceiling-Mounted Units..............................4
Unit Location.............................................................................5
Rigging Instructions.................................................................5
Hoisting Information ............................................................5
Electrical Wiring.......................................................................6
Standard Equipment................................................................7
Machine Mount, MM 500 only...........................................7
Electrical Installation...........................................................8
Minihelic®Gauge .................................................................8
Drain Collection Container, MM 1200 only.......................9
P-Trap or Y-Strainer Installation, MM 1200 only .............9
Inlet Collar, MM 1200 only.................................................10
Preliminary Start-Up Check .................................................11
Maintenance Information.....................................................12
Operational Checklist ........................................................12
Filter Removal and Installation.........................................12
Split Taper™ Bushing Mounting Instructions ...............14
Optional Equipment................................................................15
Leg Installation, MM 1200 Only........................................15
Motor....................................................................................15
Hose Kit................................................................................15
HEPA Filter...........................................................................15
Ceiling Installation..............................................................15
Wall-Mount Brackets, MM 1200 only .............................16
Troubleshooting......................................................................17
Service Notes.........................................................................18

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 Mini-Mist Air Filter, Models MM 500 and
MM 1200 are compact, machine-mountable mist
collectors designed to filter wet contaminants from
machining operations and industrial processes. Primarily
used for light- to moderate-duty applications, the Mini-
Mist is an excellent choice for machine repair, tool and
die,
or job shops with small to average production runs.
Three separate filters provide superior filtration of oil,
water-soluble and synthetic coolant mist as well as
small amounts of dust and smoke. Standard models
are designed for 500 to 1200 cfm and feature 1/2 to 1
1/2 horsepower direct-drive blowers. Standard options
include multiple motor options, wall- or machine-mount
brackets, and HEPA filters all designed to increase the
versatility of the unit.
Purpose and Intended Use
The Mini-Mist Air Filter is primarily used in source
capture applications to remove mist and secondary
contaminants such as dust and light smoke or fume
from machining operations. Two basic means create
mist particles: mechanical action and thermal effects.
Mechanical action refers to the aerosol used for light
lubrication directly from the oil or coolant nozzle.
Mechanical action creates mist greater than one micron
in size. Thermal effects occur when heat vaporizes the
coolant, the vapor cools, and re-condenses into a mist.
Thermal effects create submicron mist particles. Select
the proper module and filter options for the application.
Types of machining fluids and their applications:
• Straightoilprovidesthebestlubricationqualities
but only average cooling properties. Some examples
of machining operations using straight oil are cold
heading, cold forming, hobbing, and gear cutting.
• Water-solublecoolantsconsistpartlyofwater
and provide the best cooling properties. Examples
of applications using water-soluble coolants or
soluble oil include broaching, punching, roll forming,
and stamping because the tool moves slower and
generate less heat.
• Solubleoilorsemi-syntheticcoolantisusedforits
equal qualities of cooling and lubricating because
the tool is moving fast on close tolerances. Boring,
drilling, milling, and lathe turning centers are among
the many applications using soluble oil for cooling
although milling is the most common.
• Syntheticcoolanthassuperiorcoolingproperties.
High-speed operations that generate large amounts
of heat require a good coolant. The two main
applications are abrasive cut-off sawing and wet
grinding including centerless, cylindrical, profile,
rotary table, and surface.
• Theextremesofveryheavyoilsandverylight,thin
oils should be avoided. The very heavy oils, similar
to tar consistency, will not drain. Very light, thin oil,
similar to gasoline consistency, may evaporate.

All Units*:
Housing rating, inches water gauge ...........................+/- 20
Power and controls ....................................120-Volt 50/60 Hz
*If unit was supplied with a Record Drawing, the
specifications on the drawing will supersede the
standard specifications above.
Mini-Mist, MM 500 and MM 1200
2
Front View Typical Side View
Rating and Specification Information
Specification MM 500 MM 1200
Electrical Requirements 115/230/50/1 115/230/50/1
voltage/cycle/phase 115/230/60/1 115/230/60/1
208/230/460/60/3 208/230/460/60/3
190/380/50/3 190/380/50/3
Nominal Airflow*, cfm 500 120
Blower Motor, plug fan rpm 3450 3450
Motor Horsepower 1/2 1 or 1 -1/2
Box Filter Area, ft223 58
Approximate Weight, lb 95 165
*Actual airflow will vary depending on system design

3
Donaldson Company, Inc.
4-in impinger
1-in aluminum filter
fiberglass box filter
clean air discharges
through top of unit
dirty-air inlet
control box
Minihelic gauge
for HEPA filter
Minihelic gauge
for box filter
motor
mounting
or suspension bracket
Unit Operation
Operation
During normal operation, the direct-drive blower pulls the
contaminated air through the inlet located on the bottom
of the unit. Mist enters the first-stage filter, where a large
percentage of the mist particles coalesces and drains
back into the machine center. The air passes through a
re-usable aluminum-mesh filter before entering the third-
stage box filter. Clean, filtered air exhausts out the top of
the blower into the work environment. An ON/OFF switch
controls the blower and filter maintenance is measured
by the Minihelic gauge.

Mini-Mist, MM 500 and MM 1200
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.
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, Grade-Mounted Units
The unit can be located on a reinforced concrete
foundation.
Provide clearance from heat sources and interference
with utilities.
Site Selection, Ceiling-Mounted Units
The Mini-Mist Filters are not intended for suspended
overhead installation. Ceiling mount units require
special care to avoid equipment falling. See the Ceiling
Installation instructions and notes.
Provide clearance from heat sources and interference
with utilities.
NOTICE

5
Donaldson Company, Inc.
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.
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
Sealant (Silicone)
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 units casing.
Check the Specification Control drawing for weight and
dimensions of the unit, subassemblies, 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.

Mini-Mist, MM 500 and MM 1200
6
Electrical Wiring
Electrical 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.
1. All electrical wiring and connections, including
electrical grounding, should be made in accordance
with the National Electric Code, NFPA No. 70-latest
edition.
2. Check local ordinances for additional requirements
that apply.
3. The appropriate wiring schematic and electrical
rating must be used. See unit’s rating plate for
required voltage.
4. 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
Electric Code, NFPA No. 70-latest edition. Check
unit’s rating plate for voltage and amperage ratings.
5. Refer to the wiring diagram for the number of wires
required for main power wiring and remote wiring.

7
Donaldson Company, Inc.
Standard Equipment
Machine Mount, MM 500 only
1. Remove the inlet plenum.
2. Using the inlet plenum as a template, cut a round
hole in the top of the machine center.
3. Attach the inlet plenum to the machine center with
the welded collar inside the hole cut in Step 2. Use a
low-bonding, oil resistant sealant to make an air- and
oil-tight seal between the plenum and the machine
enclosure.
4. Attach the angle bars to the machine center.
5. Lift the unit into position over the machine center
and lower slowly. Align the holes in the angle bars
with the holes in the collector.
6. Use the gasket included to create an air- and oil-
tight seal between the inlet plenum and the bottom
of the collector.
7. Secure the collector to the machine center using
four 3/8-16 x 1-in bolts through the angle bracket and
plenum into the machine center.
lifting lug
Do not use as a
permanant
suspension or
support point
gasket
sealant
inlet
plenum
3/8-16 x 1-in
hex bolt
machine center
MM 500 Machine Mount

Mini-Mist, MM 500 and MM 1200
8
Electrical Installation
All Mini-Mist Air Filters must be equipped with a
customer-supplied safety disconnect with short-circuit
protection, contactors, and overload protection.
1. Make the wiring connections to the fan motor
according to the wiring diagram located inside the
control box and the instructions on the motor decal.
Note: All electrical components must be sized for the
supply voltage and motor horsepower.
2. Turn the fan-motor ON then OFF and check for proper
rotation by removing the inspection cover located on
top of the unit. Proper rotation is counterclockwise.
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.
Minihelic®Gauge
The Minihelic is a differential pressure gauge used to
measure the pressure difference between the clean- and
dirty-air plenums and provides a visual display of filter
change requirements.
1. Install the gauge following the manufacturer’s
installation instructions.
2. Turn unit ON and document the pressure reading.
This is the initial operating point of your system,
representing clean filter operation.
3. Periodically check the filters to establish the
maintenance requirements for the specific
application. All applications will be different based
on the operating conditions and load potential of
the machinery being served. As the filters load,
the system resistance increases, and the pressure
indicator increases.
Note: Monitor all filters initially. Not all filters have
the same replacement cycle because they are
designed for different efficiencies and extend the
life of the third-stage filter. Also, note that as the
filters load, system suction pressure decreases.
4. When observation or insufficient airflow indicates
filter maintenance, document the reading of the
pressure gauge. This pressure reading represents
filter maintenance required. Because not all filters
load at the same rate, the operator determines which
filter to use as a guide for planned maintenance.
When this is established, use the setscrew on the
front of the gauge to set the systems operating
range.

9
Donaldson Company, Inc.
Drain Collection Container, MM 1200 only
1. Install the drain collection container during leg
installation or after unit is in its final operating
position.
2. Turn unit OFF.
3. Remove the container by unscrewing the container
from the cap. Clean the container, faucet, and re-
install.
Note: Close the faucet before turning the collector back
ON.
P-Trap orY-Strainer Installation, MM 1200
only
1. Install the 1 1/2-in NPT pipe as shown in P-Trap
Installation.
2. Plumb the P-Trap to a receptacle or install a return
line back to the machine center.
3. Fill P-Trap before starting unit.
2 3/8-in OD spacer
1 1/2 to 1-in NPT reducer
3/4-in hex
lock nut
faucet
1-gallon drain
collection bottle
Drain Collection Container
hopper
pipe plug
1 1/2-in NPT
pipe
maximum
fill level
P-Trap Installation
hopper
1 1/2-in NPT pipe
pipe plug
maximum
fill level
2-in ball valve
1 1/2-in y-strainer
1-in NPT pipe
3/4-in ball valve
Y-Strainer Installation

Mini-Mist, MM 500 and MM 1200
10
Inlet Collar, MM 1200 only
Inlet collars are shipped loose with gasket and hardware
attached. They are installed on one of the four inlet
locations on the plenum.
1. Remove one inlet cover plate.
2. Install the inlet collar using the gasket provided
and secure using #7 x 1/2-in self-tapping screws
supplied.
1/4-in diameter
rope-type
sealant
inlet collar
#7 x 1/2-in self
tapping screw
Inlet Collar

11
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.
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 and remove all loose items in or near the inlet
and outlet of the unit.
5. Check that all remote controls are properly wired
and all service switches are in the OFF position.
6. Check that all optional accessories are installed
properly and secured.
7. Turn power ON at source.
8. 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.
9. Adjust airflow with the exhaust damper.
Excess airflow can shorten filter
life, cause electrical system
failure, and blower motor failure.
NOTICE

Mini-Mist, MM 500 and MM 1200
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.
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.
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.
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.
1. Turn power to unit OFF.
2. Examine the door seal and seal frame, and replace
as necessary. Check the door gutters and rubber
drain flap for accumulations and obstructions, clean
as necessary.
3. Inspect the cabinet interior and remove any foreign
material that may have accumulated.
Impinger
1. Clean or soak the impinger in mild detergent or
solvent, or in severe cases, steam.
2. Re-install with the handle facing you.
Pre-Filters
1. Wash or soak the 1-in aluminum pre-filter in mild
detergent or solvent. This pre-filter can be washed
several times before replacing.
Do not use high-pressure
washing. Filter damage will
occur.
2. When replacing, observe the direction-of-flow arrow
on the filter frame, and install accordingly.
3. Dispose of filters in accordance with local
procedures.
4-in Wire Mesh
1. Soak the filter in an appropriate wash tank Rince and
dry.
2. Re-install with the handle facing you.
NOTICE

13
Donaldson Company, Inc.
Box Filter
1. Remove box filter and dispose of properly.
2. Inspect the pile seal for condition. Replace if torn or
damaged.
3. Insert new box filter with the finger loop and airflow
direction arrow facing out.
4. Close and secure access door.
Cabinet Cleaning and Inspection
1. Inspect cabinet interior.
2. Remove foreign material, wipe interior, and clean
the sealing surfaces of the filters, cabinet doors, and
door gutters.
P-Trap Service
1. Place a suitable container under the p-trap, turn the
collector OFF and remove the pipe plug.
2. Allow fluid and particulate to drain.
3. Use thread sealant and replace pipe plug.
4. Refill the p-trap with suitable fluid before restarting
the collector.
hopper
pipe plug
1 1/2-in NPT
pipe
maximum
fill level
P-Trap Service P-Trap with Y-Strainer
P-Trap with Y Strainer, Screen Cleaning
1. Place a suitable container under the screen clean-
out valve, turn the collector OFF, close the p-trap
valve, then open the screen clean-out valve.
2. Allow fluid and particulate to drain.
3. With the clean-out valve open, slowly open the
p-trap valve. This allows fluid still trapped in the
hopper to drain.
Note: A substantial amount of fluid may be trapped
in the hopper and could exceed the container
capacity. Open the p-trap valve slowly.
P-Trap with Y Strainer, Screen Removal
1. Close the p-trap valve.
2. Unscrew the screen cap and pull the screen out.
3. Clean the ccreen and the inside of the y-strainer
body and re-assemble taking care to seat the screen
in the body and cap.
4. Close the clean-out valve.
4. Refill the p-trap with suitable fluid before restarting
the collector.
hopper
1 1/2-in NPT pipe
pipe plug
maximum
fill level
2-in ball valve
1 1/2-in y-strainer
1-in NPT pipe
3/4-in ball valve

Mini-Mist, MM 500 and MM 1200
14
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.
Bushing No. Bolt Size Torque Ft-Lbs
QT/QH/L/H 1/4-20 7-1/2
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.
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.
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.
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 bushing
size when tightened. This is not a locating
dimension.
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.
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.
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
Spilt Taper Bushing Installation
Browning®is a registered trademark and Split Taper™ is a trademark of Emerson Power Transmission Manufacturing, L.P.
NOTICE
NOTICE

15
Donaldson Company, Inc.
Optional Equipment
Leg Installation, MM 1200 Only
1. Attach the legs to the assembled unit and plenum
with the hardware supplied. Do not tighten hardware
at this time.
2. Lift into position over the anchor bolts and lower
slowly.
3. Fasten each leg pad to the anchor bolts with
customer-supplied flat washers, lock washers, and
hex nuts. Do not tighten hardware.
4. Level unit. Tighten hardware on all legs and anchor
bolts.
Motor
Optional single phase, 115-Volt, 50 or 60 Hz motors and
three phase, 230/460 or 575-Volt,
50 or 60 Hz motors are available.
Hose Kit
An optional inlet hose kit is available for overhead
mounting. The kit includes a 10-ft hose, two hose clamps,
and a collar.
HEPA Filter
The optional HEPA filter, rated at 99.97% at 0.3 microns, is
available for generated smoke or ultra-fine mist.
Ceiling Installation
Note: All ceiling supports must be sized to
accommodate the entire weight of the unit plus
the weight of the collected material and coolant
in the hopper.
Install unit to reduce sway or vibration.
1. Use four, ASTM-A36 or greater, 1/4-in threaded rods
to suspend the unit. Thread a 1/4-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.
3. Place another flat washer and 1/4-in lock nut on
the threaded rod under the mounting or suspension
bracket. Allow 1/4-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.
lifting lug
Do not use as a
permanant
suspension or
support point.
1/4-in
threaded rod
1/4-in hex nut
1/4-in flat washer
1/4-in flat washer
1/4-in lock nut
Ceiling Mount Installation

Mini-Mist, MM 500 and MM 1200
16
Wall-Mount Brackets, MM 1200 only
1. Attach the right and left brackets to the unit using
the shipping or eyebolt holes.
2. Secure with 1/4-20 x 3/4-in bolts, flat washers, lock
washers, and hex nuts.
3. Lift the unit to the desired location and mark the drill
locations using the bracket holes as a guide.
4. Drill holes and secure unit to wall using the
hardware supplied.
1/4-20 x 3/4-in
Gr2 hex bolt
1/4-in flat washer
1/4-20 hex nut
1/4-in flat washer
2.42
10.00
10.00
0.56-in
6X
wall mount
left side
wall mount
right side
26.28
28.28
Front View Side View
24.42
26.28
optional HEPA module
MM 1200 Wall Mount

17
Donaldson Company, Inc.
Troubleshooting
Problem Probable Cause Remedy
Blower fan and motor do
not start
Improper motor wire size Rewire using the correct wire gauge as specified by
national and local codes.
Not wired correctly Check and correct motor wiring for supply voltage.
See motor manufacturer's wiring diagram. Follow
wiring diagram and the National Electric Code.
Unit not wired for available
voltage
Correct wiring for proper supply voltage.
Input circuit down Check power supply to motor circuit on all leads.
Switches not ON Turn service switches ON. Press the reset button on
the motor starter.
Blower fan and motor
start, but do not stay
running
Incorrect motor starter installed Check for proper motor starter and replace if
necessary.
Access doors are open or not
closed tight
Close and tighten access doors. See Filter
Replacement.
Blower fan and motor
start with a whine and
does not reach full speed
Motor single-phasing Stop motor immediately. Check fuses and wiring for
interruptions.
Motor makes scraping or
knocking noise
Motor cooling fan cover shifted Check that the motor cooling fan and cover are in
place and secured.
No or low suction
pressure
Blower fan damper control not
adjusted properly
Check airflow in duct. Adjust damper control until
proper airflow is achieved and the blower motor’s
amp draw is within the manufacturer’s rated amps.
Electrical circui overload Check that the power supply circuit has sufficient
power to run all equipment.
Duct is plugged Check for and remove obstructions from the duct.
Filters plugged Check and clean or replace dirty or plugged filters.
See Filter Removal and Installation.
Fan rotation backwards See Electrical Installation.
Excess vibration Not installed correctly Check structural supports. Tighten all bolts on legs
and cross braces.
Clean-air outlet
discharging dust
Filters not installed correctly See Filter Replacement.
Vee-bag torn Replace as necessary
HEPA damaged Check clamping handle on HEPA filter. Tighten if
necessary.
Door or door seals damaged Check all doors and door seals. Replace as
necessary.