Donaldson Torit DWS 4-1 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.
Downflo®Workstation
DWS 4-1, 4-2, 4-3, 4-4 and DWS 6-1, 6-2, 6-3 and 6-4
Installation and Operation Manual
Installation, Operation, and Service Information
IOM AD3430701
Revision 2

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.
Downflo Workstation, DWS 4-1 to 6-4
i
Magnehelic® and Photohelic®are registered trademarks of Dwyer Instruments, Inc.
Contents
Description................................................................................1
Purpose and Intended Use ....................................................1
Rating and Specification Information...................................3
Operation...................................................................................4
Inspection on Arrival...............................................................5
Installation Codes and Procedures ......................................5
Installation.................................................................................5
Site Selection, Grade-Mounted Units...............................5
Unit Location .........................................................................5
Rigging Instructions.................................................................6
Hoisting Information................................................................6
Electrical Wiring.......................................................................6
Standard Equipment................................................................7
Single Power Module Installation.....................................7
Multiple Power Module Installation..................................7
DWS 4-1 to 4-4 and 6-1 to 6-4 Installation........................7
Acoustic Hard Sided Booth Assembly..............................9
Galvanized Hard Sided Booth Assembly........................11
Light Fixture for Hard Sided Booths................................11
Soft Sided Weld Curtain Booth Assembly......................13
Soft Sided Acoustical Booth Assembly..........................14
Compressed Air Installation.............................................15
Solid-State Timer Installation in NEMA 4 Enclosure .......16
Preliminary Start-Up Check .................................................21
Maintenance Information.....................................................22
Operational Checklist ........................................................22
Filter Removal and Installation.........................................23
Filter Removal .....................................................................23
Filter Installation.................................................................23
Fluorescent Bulb Replacement........................................23
Optional Afterfilter Replacement.....................................23
Optional Equipment................................................................24
Magnehelic®Gauge...........................................................24
Photohelic®Gauge.............................................................25
Acoustic Curtain for Power Module ...............................27
Light Fixture ........................................................................27
Afterfilters............................................................................28
Chamber Silencer ..............................................................29
IEC Control Panel with Programmable Logic Control ..29
Optional IEC Control Panel Installation...........................31
Sprinkler Installation..........................................................32
Troubleshooting......................................................................33
Service Notes.........................................................................39

Combustible materials such as buffing lint, paper, wood, metal dusts, weld fume, or flammable
coolants or solvents represent potential fire and/or explosion hazards. Use special care when
selecting, installing, and operating all dust, fume, or mist collection equipment when such combustible
materials may be present in order to protect workers and property from serious injury or damage due to a
fire and/or explosion.
Consult and comply with all National and Local Codes related to fire and/or explosion properties of
combustible materials when determining the location and operation of all dust, fume, or mist collection
equipment.
Standard Donaldson Torit equipment is not equipped with fire extinguishing or explosion protection systems.
1
Donaldson Company, Inc.
Description
The Downflo WorkStation, DWS, is a continuous duty,
self contained, modular workstation with oval cartridge
style filters. Continuous duty means the filters can be
pulse cleaned - one at a time, without turning the unit
off. The modular design creates a custom unit for each
application. The DWS power module includes a blower,
DWS 4 or DWS 6 filter modules, two (2) dust drawers
(available in either metal or plastic), a louver air inlet that
can be located in a high or low position, and a ledge less
design to reduce dust build up in the collector. Models
DWS 4-1, 4-2, 4-3, 4-4, and DWS 6-1, 6-2, 6-3, 6-4 power
modules can have joining strips to tie modules together.
Optional booths can be applied for all models. Designed
to increase versatility of the unit, standard options
include heavy duty wall and ceiling acoustic panels. They
also include a ceiling light for each power module on
hard sided and roof booths in dust tight or flush mounting
lighting. Soft side weld and acoustical curtain booths are
also available with a clear plastic ceiling to allow plant
light to illuminate the booth. Also, a moveable side shield
with canopy booth is available for one module and two
module configurations.
Purpose and Intended Use
The DWS is commonly installed in applications where
dust containment and noise control from a specific
operation are required. Typical applications include;
abrasive blasting, batch mixing, composite grinding, and
metal grinding.
While the DWS effectively contains dust and controls
much of the noise generated within the work area,
it does not provide source capture of dust and some
noise will be emitted from the booth. The 160 fpm indraft
velocity is sufficient to prevent nuisance dust from
escaping the DWS.
Abrasive Blasting
Abrasion-resistant options include an open louver inlet
and smooth wall booth. Recommended options include,
a control panel for reduced installation expense, flush
lights for increased headroom, and ASHRAE or HEPA
afterfilters for added safety on hazardous dust.
Batch Mixing
Dumping and mixing operations often produce significant
amounts of nuisance or hazardous dust. The DWS
provides effective dust control and allows complete
freedom of movement.
Composite Grinding
The DWS gives the worker complete freedom of
movement while grinding or moving around large or odd-
shaped parts. Open-pleat Fibra-Web or Ultra-Tek®filters
are required for the fibrous nature of composite dust.
An open louver inlet is also required for improved dust
capture. Recommended options include acoustic panels
for a quiet work environment, control panel for reduced
installation expense, flush lights for increased headroom,
and HEPA afterfilters for added confidence on composite
dust.

Downflo Workstation, DWS 4-1 to 6-4
2
Metal Grinding
The DWS is ideal for collecting dust from metal grinding
operations involving large or odd-shaped parts. Open-
pleat Fibra-Web filters are required to capture the
fibrous and fine dust produced in grinding and buffing
operations. Recommended options include, acoustic
panels for a quiet work environment, control panel for
reduced installation expense, flush lights for increased
headroom, and ASHRAE or HEPA afterfilters for added
confidence on hazardous dust such as chromium,
cadmium, and zinc.
Metal Welding
The DWS can be used to collect weld fume from welding
operations involving large or odd-shaped parts. Ultra-
Web®filters provide the capture efficiency required
to control weld fume. The standard louvre door can
be located high for fume when sparks are not being
generated towards the louvre doors. The low-flow, 5-Hp
blower maintains the recommended air-to-media ratio for
weld fume and provides optimum filter life.
Recommended options include, acoustic panels for a
quiet work environment with flush lights for increased
headroom on hard sided booths or soft sided weld
curtain booths, control panel for reduced installation
expense and ASHRAE or HEPA afterfilters for added
safety on hazardous dust such as chromium, cadmium,
and zinc.
Powder Paint
The DWS gives the worker complete freedom of
movement while capturing overspray. Use Ultra-Web
filter cartridges for their excellent filtration performance
of fine powder. To reduce the number of surfaces dust
can settle on and decrease the amount of time required
to clean the booth; no inlet door should be used. The
low-flow, 5-hp blower allows more powder to coat the
part and less powder is wasted. A smooth-wall booth is
recommended for a working area without ledges, making
the booth easy to clean. OSHA may require ASHRAE
afterfilters in powder coat applications. Recommended
options include, a control panel for reduced installation
expense and external light fixtures for improved lighting.

3
Donaldson Company, Inc.
Rating and Specification Information
Front View DWS 4 Typical Side View DWS 4
Compressed air, maximum psig..........................................50
Housing rating, inches water gauge ...........................+/- 20
Power, valves and controls ..................120-Volt 50/60 Hz or
....................................................................... 200 VAC 50/60 Hz
*If unit was supplied with a Record Drawing, the
specifications on the drawing will supersede the
standard specifications above.

Downflo Workstation, DWS 4-1 to 6-4
4
Operation
During normal operation, the power module containing
the blower draws dust-laden air from the work space
through the filter cartridges. Dust collects on the outside
surface of the filters. Clean, filtered air flows through to
the center of the cartridge, through the clean-air plenum
and into the blower silencer plenum. Filtered air exits
through the top of the cabinet.
Filter cleaning is completed using pulse-jet technology.
A solenoid valve controlled by a solid-state timer and
a diaphragm valve aligned to each filter provides the
pulse cleaning. The diaphragm valve sends a pulse of
compressed air through the filter cartridge from the
inside out and collected contaminants fall into the dust
drawers. At the end of each pulse, the diaphragm valve
closes and the filter cartridge resumes normal operation.
One filter cartridge is cleaned per pulse.
Unit Operation
clean air outlet
inlet
filter
cartridges
blower
silencer
plenum
Normal Operation
dust
drawers
filter clean
purge
Filter Cleaning Operation

5
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 any damage claim.
4. File claims with the delivery carrier.
5. Compare unit received with description of product
ordered.
6. Report incomplete shipments to the delivery carrier
and your Donaldson Torit representative.
7. Remove crates and shipping straps. Remove loose
components and accessory packages before lifting
unit from truck.
8. Check for hardware that may have loosened during
shipping.
9. Use caution removing temporary covers.
Installation Codes and Procedures
Codes may regulate recirculating
filtered air in your facility.
Consult with the appropriate authorities
having jurisdiction to ensure compliance
with all national and local codes regarding
recirculating filtered air.
Safe and efficient operation of the unit depends on
proper installation.
Authorities with jurisdiction should be consulted
before installing to verify local codes and installation
procedures. In the absence of such codes, install unit
according to the National Electric Code, NFPA No.
70-latest edition and NFPA 91 (NFPA 654 if combustible
dust is present).
A qualified installation and service agent must complete
installation and service of this equipment.
All shipping materials, including shipping covers, must be
removed from the unit prior to, or during unit installation.
Failure to remove shipping
materials from the unit will
compromise unit performance.
Inspect unit to ensure all hardware is properly installed
and tight prior to operating collector.
Installation
Site 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
1. The unit should be located on a flat reinforced
concrete foundation.
2. Provide clearance from heat sources and
interference with utilities when selecting the location
for 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 must be sized to accommodate the entire
weight of the unit, plus the weight of the collected
material and piping.
Locate the collector to ensure easy access to
electrical and compressed-air connections and routine
maintenance.

Downflo Workstation, DWS 4-1 to 6-4
6
Rigging Instructions
Suggested Tools & Equipment
Clevis Pins and Clamps Lifting Slings
Crane or Forklift Pipe Sealant
Drift Pins Pipe Wrenches
Drill and Drill Bits Screwdrivers
End Wrenches Socket Wrenches
Adjustable Wrench Spreader Bars
Torque Wrench (inch/lbs, 9/16-in Socket)
Hoisting Information
Failure to lift the collector
correctly can result in severe
personal injury or property damage.
Use appropriate lifting equipment and adopt
all safety precautions needed for moving and
handling the equipment.
A crane or forklift is recommended for
unloading, assembly, and installation of the
collector.
Location must be clear of all obstructions, such
as utility lines or roof overhang.
Use all lifting points provided.
Use clevis connectors, not hooks, on lifting slings.
Use spreader bars to prevent damage to 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 flanges during assembly.
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.
All electrical wiring and connections, including electrical
grounding, should be made in accordance with the
National Electric Code (NFPA No. 70-latest edition).
Check local ordinances for additional requirements that
apply.
The appropriate wiring schematic and electrical rating
must be used. See unit’s rating plate for required voltage.
If the unit is not furnished with a factory-mounted
disconnect, an electric disconnect switch having
adequate amp capacity shall be installed in accordance
with Part IX, Article 430 of the National Electrical Code
(NFPA No. 70-latest edition). Check unit’s rating plate for
voltage and amperage ratings.
Refer to the wiring diagram for the number of wires
required for main power wiring and remote wiring.

7
Donaldson Company, Inc.
Standard Equipment
Single Power Module Installation
1. Install all lifting eyes (Four (4) per power module).
Lifting eyes are shipped loose and install on roof of
DWS.
2. Connect lifting sling or chains to the four lifting eyes
located on the roof of the DWS.
3. Move the power module into position.
Note: Using the bolt hole plug pack, shipped loose,
plug the bolt holes on the power module face
with M8 x 20 mm bolts and washers provided.
4. Lifting eyes can be removed once unit is in place
to install more power modules and for mounting
accessories on roof.
Multiple Power Module Installation
1. Connect lifting sling or chains to the four lifting eyes
located on the roof of the power module.
2. Position the modules side by side. Position the
first power module, remove the lifting eyes before
positioning the next power module, as the lifting
slings and chains can interfere.
3. Secure the power modules together using the joining
strips, bolt hole plug pack, M8 x 20 mm bolts, and flat
washers.
4. Lifting eyes can be removed once unit is in place
to install more power modules and for mounting
accessories on roof.
DWS 4-1 to 4-4 and 6-1 to 6-4 Installation
Models DWS 4 and DWS 6 are installed following the
Multiple Power Module Installation instructions with the
exception of plugging the bolt holes.
lifting
eyes
inlet
Single Power Module Installation
lifting
eyes
inlet
joining
strips
plug holes
both outside edges
Multiple Power Module Installation

Downflo Workstation, DWS 4-1 to 6-4
8
This Page Intentionally Left Blank

9
Donaldson Company, Inc.
Acoustic Hard Sided Booth Assembly
Note: Use M8 x 45 mm bolts to fasten the side rail
channels.
Use M8 x 35 mm bolts to fasten the top support
channels.
Use M8 x 20 mm bolts for the remainder of the
assembly.
1. Fasten the module side angles to the right and left
side of the assembled power modules.
2. Fasten the top panel angle to the top front of each
power module.
3. Assemble two booth panels and a side panel angle to
form a wall unit.
4. Attach wall to the outside of the power module side
angle.
5. Fasten the side-rail channels to the wall using
M8 x 45 mm long bolts, flat washers, and hex nuts.
Note: The side-rail channel with four bolt holes fits
on the outside bottom of the walls and the
side-rail channel with three bolt holes fits on
the inside of the walls about midway up. Do
not fasten the inside channel until the acoustic
panels have been installed.
6. Bolt the gussets to the right and left support legs
and fasten the support legs to the edge of the
corresponding walls.
7. Bolt the top support channel to the gussets.
Note: The DWS-2 requires one top support channel.
DWS-3 and DWS-4 require two top support
channels. When assembling the DWS-3 or
DWS-4, bolt the two top support channels and
the top support tie-in together and then bolt to
the gussets.
Roof panels are not intended
as platforms. Personnel should
use ladders or other appropriate equipment to
avoid risk of personal injury and/or property
damage.
8. Install and bolt the booth roof panels in place.
Note: Temporary roof support during assembly is
not required. The top panel angles and the top
support channels support the roof panels.
9. Attach the splicer plate to the top panel angles with
the roof panels.
10. Install the acoustic panels to the power modules,
booth roof, and walls.
11. Secure acoustic panels with nylon Christmas Tree™
clips supplied.
12. Install flexible protective caps over exposed end of
Christmas Tree clips.
13. Tuck the edges of the booth acoustic panels into the
return flanges of the booth panels.
14. See light fixture mounting and wiring.
Christmas Tree™ Clips is a trademark of ITW Fasnex®

Downflo Workstation, DWS 4-1 to 6-4
10
Acoustic Hard Sided Booth Assembly
support leg
side rail
channel
module side
angle
side panel
angle
gusset
top support
tie-in
top support
channel
booth panel
top panel angle
splicer plate
mounting angle
light fixture

11
Donaldson Company, Inc.
Galvanized Hard Sided Booth Assembly
Note: Use M8 x 45 mm bolts to fasten the side rail
channels.
Use M8 x 35 mm bolts to fasten the top support
channels.
Use M8 x 20 mm bolts for the remainder of the
assembly.
1. Fasten the module side panel angles to the right and
left side of the assembled power modules.
2. Fasten the top panel angle to the top front of each
power module.
3. Assemble two booth panels and a side panel angle to
form a wall unit.
4. Attach wall to the outside of the power module side
angle.
Note: The stiffener side is the external wall and the
side-rail channel is the inside.
5. Fasten the side-rail channels to the wall using
M8 x 45 mm long bolts, flat washers, and hex nuts.
6. Bolt the gussets to the right and left support legs
and fasten the support legs to the edge of the
corresponding walls.
7. Bolt the top support channel to the gussets.
Note: The DWS-2 requires one top support channel.
DWS-3 and DWS-4 require two top support
channels. When assembling the DWS-3 or
DWS-4, bolt the two top support channels and
the top support tie in together and then bolt to
the gussets.
Roof panels are not intended
as platforms. Personnel should
use ladders or other appropriate equipment to
avoid risk of personal injury and/or property
damage.
8. Install and bolt the booth roof panels in place.
Note: Temporary roof support during assembly is
not required. The top panel angles and the top
support channels support the roof panels.
9. Place the light fixture on the clear panel between the
stiffener angles on the booth roof.
Light Fixture for Hard Sided Booths
1. Attach the light mounting angles to the booth roof
panels using M8 x 20 mm bolts, flat washers, and hex
nuts.
2. Mount the light fixture to the mounting angles
using M8 x 20 mm bolts, flat washers, and hex nuts
supplied.
3. Install customer-supplied fluorescent bulbs.
4. See Electrical Installation for wiring connections.
5. Diaphragm valves have an external solenoid
enclosure mounted inside the clean air plenum
on the pressure manifold. Wire each solenoid by
loosening the solenoid enclosure cover fastening
screws. Pull the cover from the solenoid enclosure.
Wire solenoids through access points in rear
of cabinet and enclosure by referencing wiring
diagram.

Downflo Workstation, DWS 4-1 to 6-4
12
module side angle
side panel angle
booth panel
support leg
gusset
side rail channel
top support
channel
top panel angle
splicer plate
Galvanized Hard Sided Booth Assembly
mounting angle
light fixture
M8 x 20mm
bolt
M8 flat washer
M8 hex nut
0.34-in
diameter
Detail A
industrial or dust-tight
light fixture
mounting angle
see Detail A
Light Fixture Installation

13
Donaldson Company, Inc.
Soft Sided Weld Curtain Booth
8.13
1.00
1.25
0.281 Dia typ.
Bracket Detail
4. Insert the foot pad and corner bracket into the front
legs.
5. Insert the eight (8) roller hooks into the side channel.
Install one end of the side channel into the end
bracket mounted to the power module. The other
end of the side channel should be installed into the
corner bracket. Repeat these steps for the opposite
side of the unit.
6. Install each end of the front channel into the corner
brackets on each of the front legs. The front channel
should extend past the side channels in order to lock
in the roller hooks. Square the entire frame assembly
and tighten all set screws on the end, corner, and
coupling brackets. Anchor leg foot pad to the floor.
7. Install the self-adhesive hook-and-loop fastener
around the top of the channels and angles on the
power module. Install the clear plastic roof.
8. Install the self-adhesive hook-and-loop fastener strip
down the outside of the side angles (2 places) and on
the outside surface of the front legs. Hang the tinted
side curtain on the roller hooks. Attach the side
curtain to the hook-and-loop strips. Repeat this for
the opposite side of the booth assembly.
Soft Sided Weld Curtain Booth Assembly
DWS Models 4-2, -3, -4
1. Position the power modules in-line so fronts are even
and two sides are touching face-to-face. Position the
first power module and remove lifting eyes, repeat
this for each additional power module.
2. Remove and reuse the existing bolts and washers
to install the joining strips in between the power
modules.
DWS Models 6-1, -2, -3
1. For DWS Models 6-2 and -3, check assembly
drawings for power module spacing positions. Also,
a spacer panel will need to be installed in between
the power modules on these models. See drawings
for details.
2. Install the side panels on each end of the power
module assembly. Remove and reuse the existing
bolts and washers on the front of the cabinet.
DWS Models 4 and 6
3. Install the side and top angles (3 places) with the
existing hardware from the front of each power
module. Attach the end brackets (2 places) to the
outer ends of each power module with the provided
hardware.
Note: for the DWS Models 4-2, -3, -4 only- Four (4)
holes will need to be drilled in the front panel of the
power module in order for the end brackets to be
attached. See Bracket Detail for hole location and
size.

Downflo Workstation, DWS 4-1 to 6-4
14
Soft Sided Acoustical Booth
7. Install each end of the front channel into the corner
brackets on each of the front legs. The front channel
should extend past the side channels in order to lock
in the roller hooks. Square the entire frame assembly
and tighten all set screws on the end, corner, and
coupling brackets. Anchor the leg foot pad to the
floor.
8. Install the self-adhesive Velcro strip around the top
of the channels and angles on the power module.
Install the clear plastic roof.
9. Install the self-adhesive Velcro strip down the
outside of the side angles (2 places) and on the
outside surface of the front legs. Hang the tinted side
curtain on the roller hooks. Attach the side curtain to
the Velcro strips. Repeat this for the opposite side of
the booth assembly.
Soft Sided Acoustical Booth Assembly
DWS Models 4-2, -3, -4
1. Position the power modules in-line so fronts are even
and two sides are touching face-to-face. Position the
first power module and remove lifting eyes, repeat
this for each additional power module.
2. Remove and reuse the existing bolts and washers
to install the joining strips in between the power
modules.
DWS Models 6-1, -2, -3
1. For DWS Models 6-2 and -3, check assembly
drawings for power module spacing positions. Also,
a spacer panel will need to be installed in between
the power modules on these models. See drawings
for details.
2. Install the side panels on each end of the power
module assembly. Remove and reuse the existing
bolts and washers on the front of the cabinet.
DWS Models 4 and 6
3. Install the side and top angles (3 places) with the
existing hardware from the front of each power
module. Attach the end brackets (2 places) to the
outer ends of each power module with the provided
hardware.
Note: for the DWS Models 4-2, -3, -4 only- Four (4)
holes will need to be drilled in the front panel of the
power module in order for the end brackets to be
attached. See Bracket Detail for hole location and
size.
4. Install the mounting angles (2 places) just below the
sprinkler couplings on the power module. Remove
and reuse the existing bolts and washers.
5. Insert the foot pad and corner bracket into the front
legs.
6. Insert the eight (8) roller hooks into the side channel.
Install one end of the side channel into the end
bracket mounted to the power module. The other
end of the side channel should be installed into the
corner bracket. Repeat these steps for the opposite
side of the unit.

15
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
pressure from the collector when closed and
include provisions to allow closed-position
locking.
Do not set compressed-air
pressure above 60-psig.
Component damage can occur.
All compressed air components must be sized
to meet the maximum system requirements of
50-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. Compressed-air components must be sized for
system requirements as follows: one, two, or three
power modules, 0.86 CF at 50-psig or 1.0 CF at
60-psig.
2. Connect the compressed-air supply line to the 1-in
NPT connection located at the rear of each power
module. Use thread-sealing tape or pipe sealant on
all compressed-air connections.
3. Install a customer-supplied shut-off valve, bleed-
type regulator with gauge, filter, and automatic
condensate valve in the compressed-air supply line.
4. With power supply ON, check the operation of the
solenoid valves. The valves should open and close
sequentially at factory set 10-second intervals.
5. If a Photohelic®gauge, Torit Delta P, Torit Delta P
Plus, or similar device is used to control the solid-
state timer, the solenoid valves pulse only when
the differential pressure reaches the high-pressure
setpoint. The valves continue to pulse until the low-
pressure setpoint is reached.
power supply*(208/230/460/575/60/3)
disconnect switch*
low voltage starter*
solid-state timer
blower electrical*
solenoid electrical*
compressed air
supply line*
light switch*
industrial light electrical*
industrial light
booth
assembly
power
module
* customer supplied
sprinkler system (not shown)*
Compressed Air and Component Installation

Downflo Workstation, DWS 4-1 to 6-4
16
Solid-State Timer Installation in
NEMA 4 Enclosure
Electrical 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 installation, service,
or maintenance work.
Do not install in classified hazardous
atmospheres without an enclosure rated for
the application.
The solid-state timer is an electronic timer used to
control the filter cleaning system. Each power module
is equipped with four or six 115-Volt AC solenoid valves
that energize the diaphragm valves to pulse-clean
the filter cartridges. The timer is factory adjusted
at 100-millisecond ON time and 10-second OFF time
between pulses.
1. Mount the fan starter with low voltage control in a
convenient location.
2. Mount the control box as close to the blower motor
starter as possible.
3. Using the wiring diagram supplied, wire the blower
motor, blower-motor starter, solid-state timer, and
solenoid valves. Use appropriate wire gauge for
rated amp load as specified by local codes.
Note: Access the solenoid valves and blower
motor by removing the access covers at the
rear of the power module. After wiring is
complete, replace the covers.
Route wiring through the conduit holes located
at the rear of the power module. All conduit
holes are sized for 3/4-in fittings. Secure all
conduit in the blower and solenoid plenums.
Seal conduit to prevent airflow from passing
through to the control panels.
4. Diaphragm valves have an external solenoid
enclosure mounted inside the clean air plenum
on the pressure manifold. Wire each solenoid by
loosening the solenoid enclosure cover fastening
screws. Pull the cover from the solenoid enclosure.
Wire solenoids through access points in rear
of cabinet and enclosure by referencing wiring
diagram.
5. Motor and fan should be wired for clockwise rotation
when viewed from the back of the motor.
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.
6. Turn the blower motor ON then OFF. Check for
clockwise rotation when viewed from the back of the
motor.
7. 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.

17
Donaldson Company, Inc.
Solenoid Enclosure