Donaldson Torit WSO M 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.
WSO M Mist Collector
Machine Mountable
Installation and Operation Manual
Installation, Operation, and Service Information
IOM AK0300401
Revision 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

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.
WSO Mist Collector,WSO M
i
Contents
Description................................................................................1
Purpose and Intended Use ....................................................1
Rating and Specification Information...................................2
Operation...................................................................................3
Inspection on Arrival...............................................................4
Installation Codes and Procedures ......................................4
Installation.................................................................................4
Unit Location .........................................................................5
Site Selection........................................................................5
Foundations or Support Framing .......................................5
Rigging Instructions.................................................................5
Hoisting Information ............................................................5
Electrical Wiring...................................................................6
Standard Equipment................................................................7
Provisional Anchor Bolt Recommendations....................7
Standard Equipment Options..............................................9
Flush Mount with Inlet Gasket ...........................................9
Flanged Inlet Hopper with Legs.........................................9
Ceiling Mount Installation.................................................10
Collector Stand...................................................................11
Inlet Hopper with Flex-Duct..............................................12
Inlet Hopper with Vibration Isolators..............................13
Inlet Hopper and Impact Separator ................................14
Factory-Installed HEPA or 95% DOP Final Filter............15
Final Filter Removal and Installation...............................15
Retrofit Kit Field Installation .............................................15
Electrical Connection............................................................15
Unwired Units .....................................................................15
Preliminary Start-Up Check .................................................17
Maintenance Information.....................................................18
Operational Checklist ........................................................18
Filter Removal and Installation.........................................18
First Stage Filter Cleaning and Installation....................18
Primary Filter.......................................................................19
Final Filter ............................................................................19
Troubleshooting......................................................................20
Service Notes.........................................................................22

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
Designed for versatility, the WSO M (Water, Smoke, and
Oil) mist collector is specifically engineered for water-
soluble, smoke, and oil-based mist applications. WSO
M mist collector, Machine-Mountable Model collects
airborne mist such as oil, water-soluble, semi-synthetic
and synthetic coolant from machining operations. Two
stages of filtration, plus an optional HEPA or 95% DOP
filter, provide a cleaner, healthier work environment as
well as a more cost effective means of mist collection.
With clean filter airflow capacities of 520 cmh (306
cfm) @ 50 Hz and 660 cmh (388 cfm) @ 60 Hz, the WSO
M is a strategic component to meeting industrial and
government air-quality standards. The high efficiency
filter cartridges allow air and coolants to be recycled.
Designed to increase the versatility of the unit, a variety
of filter media specifically designed for mist collection
is a standard offering on the product line. The primary
filter is uniquely designed for either water-based
coolants, straight oils, or thermally-generated smoky
applications. Standard options include drain collection
containers, adjustable floor mounting stands, and
afterfilters.
The WSO M machine-mountable unit is powered by a
blower and motor mounted in the filter cabinet.
Airborne mist is small droplets of metalworking fluids
suspended in the air. Metalworking fluids include
straight oils, water-soluble coolants, semi-synthetic
synthetic coolants. These fluids perform a variety of
functions such as lubricating or cooling the part or the
tool, flushing chips away from the part, and suppressing
dust and smoke.
Mist is created in two ways: mechanical action or
thermal effects. Mechanical action involves coolant
used for light lubrication and generally creates mist
greater than one micron in size. Thermal effects occur
when heat vaporizes the coolant, the vapor cools and
recondenses into a mist. Thermal effects create mist
from 0.01 to 1 micron in size. Other contaminants, such
as dust from the part or the tool or smoke from the
vaporization of the oil or coolant are also generated
when using metalworking fluids.
The WSO M mist collector is not designed to handle
water mist alone. There should be some type of oil
content to allow coalescing since water vapor will
simply pass through the filters. The extremes of very
heavy oil and light, thin oil should be avoided. Very heavy
oil, similar to tar consistency, will not drain while very
light, thin oil, similar to paint thinner consistency, may
evaporate.
Purpose and Intended Use
Misuse or modification of this
equipment may result in personal
injury.
Do not misuse or modify.

All Units (as per IBC 2009 Specifications):
Housing rating, inches water gauge ...........................+/- 10
Control power.............................................200-Volt, 50/60 Hz
220-Volt, 50/60 Hz
380-Volt, 50/60 Hz
*If unit was supplied with a Record Drawing, the
specifications on the drawing will supersede the
standard specifications above.
WSO Mist Collector,WSO M
2
Rating and Specification Information

3
Donaldson Company, Inc.
clean-air outlet
dirty-air inlet and collected mist drain
first-stage filter
pleated filter
cartridge
large droplets
large droplets
exhaust pack
clean-air plenum
blower motor
blower
Unit Operation
Operation
During normal operation, contaminated air enters the
unit through the dirty-air inlet on the bottom of the unit.
The incoming air slows, causing large mist droplets and
particles to fall out of the air stream. The air passes
through a reusable first-stage filter designed to collect
and coalesce large droplets and particles.
The primary stage of filtration is the pleated filter
cartridge specifically designed to collect, coalesce, and
drain fine mist. As the mist coalesces, the droplets are
big enough to run down the cartridge and drain back into
the collector. The droplets will drain on both the inside
and outside of the cartridge. Liquid that collects on the
inside of the cartridge drains through the bottom portion
of the porous media and into the hopper. Clean, mist-free
air exits the cartridge and discharges through the top of
the collector.

WSO Mist Collector,WSO M
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
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.
Site selection must account for
wind, seismic zone, and other
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.
Collectors must be anchored in a manner
consistent with local code requirements and
anchors must be sufficient to support dead,
live, seismic, and other anticipated loads.
Consult a qualified engineer for final selection
of anchorage.

5
Donaldson Company, Inc.
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 Bar
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.
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 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.
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.
If combustible materials will
be processed through this
collector, local codes may require the collector
be located either outside or adjacent to an
exterior wall to accommodate devices related
to a fire or explosion mitigation strategy.
Consult local codes prior to installation.
Site Selection
This unit can be located on a foundation or structural
framing.
Provide clearance from heat sources and avoid any
interference with utilities when selecting the location.
Foundations or Support Framing
Prepare the foundation or support framing in the
selected location. Foundation or support framing must
comply with local code requirements and may require
engineering.
Foundation and support framing must be capable of
supporting dead, live, wind, seismic and other applicable
loads. Consult a qualified engineer for final selection of
foundation or support framing.

WSO Mist Collector,WSO M
6
Ceiling-Mounted Units
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. The dry
unit weight is shown on the specification control
drawing shipped with the unit.
2. The live load will include the weight of all ancillary
hardware attached to the mist collector, as well as
the weight of the mist-laden, wet filters. Consult the
coolant MSDS for the specific gravity of the coolant
to estimate the weight of the mist-laden, wet filters.
3. Check the Specification Control drawing for weight
and dimensions of the unit, subassemblies, and
components to ensure adequate crane capacity.
Electrical Wiring
Electrical installation, 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 local
codes.
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.
An electric disconnect switch having adequate amp
capacity shall be installed in accordance with local
codes codes. 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.
The only component requiring electrical power is the
blower motor.

7
Donaldson Company, Inc.
Standard Equipment
Anchor should project
a minimum of 1 3/4-in
and account for nut,
washer, base plate
and shims/grout.
Embedment depth
Typical Foundation Anchor
Provisional Anchor Bolt Recommendations
1. Consider Hilti HIT-HY 200 Anchor System or
equivalent. Quantity of anchor bolts should match the
number of holes provided in the base plates.
2. Anchor diameter is typically 1/8-in less than
baseplate hole diameter.
3. Corrosive environment or outdoor installation may
require stainless steel anchors.
General Installation
1. Apply a generous amount of sealant when installing
attachments.
2. Position the collector above the mist-capture zone.
See Collector Positioning.
3. Do not allow a P-Trap to form when using flexible
duct. See Flex-Duct Positioning.
4. On enclosed-machine installations, mount the unit
as far from the chip conveyor opening as possible.
Installing too close allows the negative pressure
created by the unit to draw clean shop air, not
mist, into the collector. See Enclosed-Machine
Installation.
5. On open-machine installations, position the unit’s
pick-up hood a minimum of 305 mm (12-inches) from
the mist source. Avoid mounting the pick-up hood too
close to the mist source of an open machine such
as a wet surface grinder. Installing too close can
shorten filter life as the unit will collect large droplets
and particulate instead of mist. See Open Machine
Installation.
A variety of configuration and mounting options are
available with the WSO M. The WSO M can be mounted
directly on the roof of a machining center, suspended
overhead, or stand-mounted.
machine
center
Correct
machine
center
Incorrect
P-trap
Flex Duct Positioning

WSO Mist Collector,WSO M
8
Collector Positioning
machine center machine center
Correct Incorrect
Correct Location
Incorrect Location
Enclosed Machine Installation
Open Machine Installation
large droplets
and particulate
enter pick-up
hood

9
Donaldson Company, Inc.
Standard Equipment Options
Flush Mount with Inlet Gasket
An inlet gasket is used on machine centers that have a
large, flat unobstructed top surface.
1. Lift the unit into position over the machine center and
lower slowly.
2. Open the unit’s access door and remove the filter
cartridge, filter retention mechanism, and the first-
stage filter.
3. Trace the lower hopper opening onto the machine
center, remove unit and cut hole.
4. Align the bolt template with the cut out and match-
drill the bolt holes using a 5/16-in diameter drill bit.
Remove and discard template.
5. Remove the protective backing from the gasket and
apply to the machine center adhesive side down.
6. Lift unit into position and lower slowly. Fasten using
6mm bolts, washers, and hex nuts supplied.
Start bolts from the inside of the machine center.
Do not overtighten. Compress gasket 5 mm (3/16-in)
maximum.
7. Install a bolt into every rivnut hole.
Flanged Inlet Hopper with Legs
This flanged inlet hopper option is for installing a
collector on a machine center that has a limited amount
of unobstructed top surface.
1. Open the units access door and remove the primary
and first stage filters.
2. Remove the filter retention system.
3. Carefully lift unit into position over the machine
center and lower into position.
4. Trace bolt pattern onto the machine center or match
drill pattern.
5. Cut opening into machine center and drill mounting
holes.
6. Move the unit aside and apply generous amounts of
sealant to the outside perimeter of the bolt pattern on
the machine center.
7. Carefully position unit over the bolt pattern and lower
into position.
8. Install and tighten fasteners into every hole.
9. Install filter retention system and filters.
leg
hopper
sealant
Inlet Hopper with Legs

WSO Mist Collector,WSO M
10
Ceiling Mount Installation
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.
Ensure weight of oil-laden unit plus weight
of required materials and equipment will be
adequately supported. Failure to comply may
result in personal injury and/or property damage.
1. Verify that the ceiling attachment points can bear the
live load.
2. Use properly sized cable or chain to attach to each
of the four eyebolts to suspend the unit from the
ceiling.
3. To prevent sway, position the chain or cable to form
a 60 degree angle to the top of the unit and a 45
degree angle along the sides.
Top View
Front View
45°
60°
customer-supplied
chain or cable
eye bolts
flat washer
existing mounting holes
use sealant
Ceiling Mount

11
Donaldson Company, Inc.
Collector Stand
If collector drainage is not
properly maintained, the
collector may collapse on stand and cause
severe personal injury or property damage.
Maintain proper collector drainage.
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.
For applications with limited mounting surfaces, an
adjustable stand is available. Bolt the stand’s base
securely to the floor, attach the collector, and adjust
height from 1676 to 2590 mm (66 to 102-in).
1. Install customer-supplied 3/8-16 anchor bolts in the
floor extending 38 mm (1 1/2-in) above surface.
2. Level the collector stand and tighten anchor bolts
securely.
3. Lift the unit and remove the bolts from the access
panel located on the bottom of the unit. Remove bolts
only. Do not remove access panel.
4. Adjust the stand height by loosening the four locking
bolts on the upper portion of the stand. Slide this
section up to obtain the required height. Tighten
bolts securely. Do not adjust the stand over 2590 mm
(102-inches).
5. Using a crane or forklift, lift the unit into position over
the stand and lower slowly.
6. Fasten the top plate of the stand to the unit using the
bolts removed in Step 3.
7. Tighten all hardware and remove crane.
stand
extension
locking bolt
flat washer
lock washer
flat washer
hex nut
base
2590 mm (102-in)
maximum
Collector Stand

WSO Mist Collector,WSO M
12
Inlet Hopper with Flex-Duct
This option is available for ceiling mounted units or units
on customer-supplied stands. Included components are
a 152 mm (6-in) diameter collar, 3048 mm (10-ft) flexible
duct, two 152 mm (6-in) hose clamps, and a 152 mm (6-in)
mounting collar.
1. Lift the unit approximately 1524 mm (5-ft).
2. Apply sealant around the flex-duct collar toward the
outside of the bolt pattern.
3. Align the adapter with the bottom flange of the
hopper. Fasten using bolts, washers, and hex nuts
supplied.
4. Apply sealant around the hopper’s top flange toward
the outside of the bolt pattern.
5. Align the top flange of the hopper with the bolt
pattern on the bottom of the unit and secure using
6mm bolts and washers supplied.
Note: Install a 6mm bolt into every rivnut.
6. Fasten one end of the flexible duct to the collar using
a six inch hose clamp.
7. Position the inlet collar on the machine center and
trace the inlet opening and bolt pattern. Remove inlet
collar, cut inlet hole, and drill bolt holes using a
3/16-in diameter drill bit.
8. Apply a 6mm (1/4-in) bead of sealant to the machine
center, toward the outside edge of the bolt pattern.
9. Align collar and fasten to machine center using
1/8-in customer-supplied bolts, washers, and hex
nuts.
10. Trim the flexible duct to the required length and
secure with remaining hose clamp.
Do not allow flexible duct to
create a P-Trap. See Flex-Duct
Positioning.
sealant
hopper
sealant
flex-duct collar
hose clamp
flex-duct
hose clamp
inlet collar
Inlet Hopper with Flex-Duct

13
Donaldson Company, Inc.
Inlet Hopper with Vibration Isolators
A vibration isolation kit is for top-mounted units installed
on machine centers sensitive to vibration. The kit
includes four isolators, a support frame, hopper,
152 mm (6-in) diameter flexible duct and a duct collar
with mounting flange and two hose clamps.
1. Carefully lift unit and turn over so the bottom inlet is
facing up.
2. Remove plugs or existing hardware from the five
holes on the unit’s left side.
3. Apply sealant to the leg’s top flange and secure to
unit using the hardware removed in Step 2.
4. Apply sealant to the inlet collar toward the outside
edge of the bolt pattern. Fasten inlet collar to the
hopper’s bottom flange using the bolts, washers, and
hex nuts supplied.
5. Apply sealant around the hopper’s top flange toward
the outside of the bolt pattern.
6. Align the top flange of the hopper with the bolt
pattern on the bottom of the unit and secure using
6mm bolts and washers supplied.
7. Attach remaining leg to the right side of the unit
following the same procedure.
8. Turn unit upright, lift into position over the machine
center and lower slowly. Do not remove crane.
9. Match-drill four holes in the machine center for
securing the legs.
10. Position the inlet collar on the machine center and
trace the inlet opening and bolt pattern. Remove inlet
collar, cut inlet hole, and drill bolt holes using a
3/16-in diameter drill bit.
11. Apply a 6 mm (1/4-in) diameter bead of sealant to the
machine center, toward the outside edge of the bolt
pattern.
12. Align collar and fasten to machine center using
1/8-in customer-supplied bolts, washers, and hex
nuts.
13. Fasten the isolators to the machine center.
14. Lift unit into position over the vibration isolators and
lower slowly. Fasten using the supplied hardware.
15. Connect the flexible duct using the supplied hose
clamps.
sealant
hopper
sealant
flex-duct collar
hose clamp
flex-duct
hose clamp
inlet collar
leg
vibration
isolator
Inlet Hopper with Vibration Isolators

WSO Mist Collector,WSO M
14
Inlet Hopper and Impact Separator
Impact separators are available for remote-mounted
units in operations generating large amounts of small
particulate such as surface grinding, polishing, and high-
speed cutting.
1. Lift the unit approximately 1524 mm (5-ft).
2. Apply sealant around the impact separator toward
the outside of the bolt pattern.
3. Align the impact separator with the bottom flange of
the hopper. Fasten using bolts, washers, and hex nuts
supplied.
4. Apply sealant around the hopper’s top flange toward
the outside of the bolt pattern.
5. Align the top flange of the hopper with the bolt
pattern on the bottom of the unit and secure using
6mm bolts and washers supplied.
Note: Install a 6mm bolt into every rivnut.
6. Fasten the flexible duct to the 152 mm (6-in) side inlet
on the impact separator using a hose clamp.
7. Connect opposite end of flexible duct to a customer-
supplied angular nozzle, inlet collar, or other fitting.
8. Install drain collection container by threading the
container onto the bottom of the impact separator.
The container’s faucet must be closed when the unit
is in operation.
hopper
sealant
impact
separator
sealant
optional drain
collection
container
hose clamp
flexible
duct
hose
clamp
Inlet Hopper with Impact Separator

15
Donaldson Company, Inc.
Factory-Installed HEPA or 95% DOP Final
Filter
HEPA filters provide 99.97% efficiency on 0.3 micron
particles. 95% DOP filters are less efficient than HEPA’s
but generally provide longer final filter life.
The HEPA or 95% DOP final filter is attached to the side
of the WSO M unit using side-mounted latches.
Final Filter Removal and Installation
1. Release the latches on both sides of the HEPA/95%
DOP filter frame. Dispose of used filter properly. Do
not wash.
2. Install new HEPA/95% DOP filter with the gasket
facing the frame and the airflow arrow pointing away
from the unit.
Retrofit Kit Field Installation
An afterfilter installation retrofit kit is available for
customers who decide to add a HEPA or 95% DOP
filter to an existing field-operating WSO M machine-
mountable unit originally configured with a standard
exhaust. The field kit includes: afterfilter, adaptor with
latches and hardware.
latch
HEPA or 95% DOP final filter
airflow
HEPA or 95% DOP Final Filter Replacement
Electrical Connection
Electrical installation, 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.
WSO M mist collectors must be equipped with a
customer-supplied safety disconnect with short circuit
protection, contactors, and overload protection.
Complete the wiring as shown in 3 Phase Motor Starter
Wiring.
Unwired Units
1. Remove the exhaust pack. Remove all bolts
and lift starting at one corner.
The gasket material is fragile
and must be handled with care. If the gasket is
disrupted, reposition evenly around the inner
and outer flanges when replacing the exhaust
panel.
U
V
W
RED
WHITE
BLACK
MOTOR
3~
PE
GRN/YEL
U
V
W
PE
PREWIRED IN FACTORY
PROVIDED & WIRED BY OTHERS
JUNCTION BOX
CONNECT TO MOTOR
STARTER
3 Phase Motor Starter Wiring

WSO Mist Collector,WSO M
16
2. 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.
All electrical components must
be sized for the supply voltage
and motor horsepower. See Motor Starter
Wiring.
3. Turn the fan-motor ON then OFF and check for proper
rotation by removing the inspection cover on the top
of the WSO M and viewing the wheel rotation.
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.
exhaust pack
fan motor
junction box
fan wheel
inspection cover
Fan Blower

17
Donaldson Company, Inc.
5. Check and remove all loose items in or near the inlet
and outlet of the unit.
6. Check that all remote controls are properly wired
and all service switches are in the OFF position.
7. Check that all optional accessories are installed
properly and secured.
8. Check that hopper discharge is open
9. Close faucet valve on drain collection container if
used.
10. Turn power ON at source.
11. Turn blower fan motor ON.
Stand clear of exhaust to avoid
personal injury.
Instruct all personnel on safe use and maintenance
procedures.
Electrical work during
installation, service or
maintenance 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.
1. Check all electrical connections for tightness and
contact.
2. Check for proper rotation as noted on the fan
housing.
To reverse rotation, single-phase power supply:
Follow manufacturer’s instructions on the motor’s
nameplate.
To reverse rotation, three-phase power supply:
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 door is properly sealed and clamped.
Preliminary Start-Up Check