COOK SDB User manual

1DB IO&M B51131-002
®
Receiving and Inspection
Carefully inspect the fan and accessories for any dam-
age and shortage immediately upon receipt of the fan.
• Turn the wheel by hand to ensure it turns freely and does
not bind
• Check dampers (if included) for free operation of all
moving parts
• Record on the Delivery Receipt any visible sign of damage
Handling
Lift the fan by the base or lifting eyes.
NOTICE! Never lift by the shaft, motor or housing.
Storage
If the fan is stored for any length of time prior to installa-
tion, store it in its original shipping crate and protect it from
dust, debris and weather.
DB/DBX
DUCT BLOWER
Cabinet Fans
INSTALLATION, OPERATION AND MAINTENANCE MANUAL
Rotating Parts & Electrical Shock Hazard:
Fans should be installed and serviced by qualied person-
nel only.
Disconnect electric power before working on unit (prior to
removal of guards or entry into access doors).
Follow proper lockout/tagout procedures to ensure the unit
cannot be energized while being installed or serviced.
A disconnect switch should be placed near the fan in order
that the power can be swiftly cut off, in case of an emer-
gency and in order that maintenance personnel are pro-
vided complete control of the power source.
Grounding is required. All eld-installed wiring must be
completed by qualied personnel. All eld installed wiring
must comply with National Electric Code (NFPA 70) and all
applicable local codes.
Fans and blowers create pressure at the discharge and
vacuum at the inlet. This may cause objects to get pulled
into the unit and objects to be propelled rapidly from the
discharge. The discharge should always be directed in a
safe direction and inlets should not be left unguarded. Any
object pulled into the inlet will become a projectile capable
of causing serious injury or death.
When air is allowed to move through a non-powered fan,
the impeller can rotate, which is referred to as windmill-
ing. Windmilling will cause hazardous conditions due to
unexpected rotation of components. Impellers should be
blocked in position or air passages blocked to prevent draft
when working on fans.
Friction and power loss inside rotating components will
cause them to be a potential burn hazard. All components
should be approached with caution and/or allowed to cool
before contacting them for maintenance.
Under certain lighting conditions, rotating components
may appear stationary. Components should be veried to
be stationary in a safe manner, before they come into con-
tact with personnel, tools or clothing.
Failure to follow these instructions could result in death or
serious injury.
The attachment of roof mounted fans to the roof curb as
well as the attachment of roof curbs to the building struc-
ture must exceed the structural requirements based on the
environmental loading derived from the applicable build-
ing code for the site. The local code ofcial may require
variations from the recognized code based on local data.
The licensed engineer of record will be responsible for pre-
scribing the correct attachment based on construction ma-
terials, code requirements and environmental effects spe-
cic to the installation.
This publication contains the installation, operation and
maintenance instructions for standard units of the DB:
Ceiling, Wall and Cabinet Fans.
• DB/TDB
• SDB/DBX
Carefully read this publication and any
supplemental documents prior to any
installation or maintenance procedure.
Loren Cook catalog, DB, provides additional information
describing the equipment, fan performance, available ac-
cessories and specication data.
For additional safety information, refer to AMCA Publi-
cation 410-96, Safety Practices for Users and Installers of
Industrial and Commercial Fans.
All of the publications listed above can be obtained from:
• lorencook.com
• [email protected]
• 417-869-6474 ext. 166
For information and instructions on special equipment,
contact Loren Cook Company at 417-869-6474.

2DB IO&M B51131-002
3 Phase, 9 Lead Motor
456
1
7
2
8
3
9
L1L2L3
456
789
12 3
L1L2L3
Low Voltage
208/230 Volts
High Voltage
460 Volts
3 Phase, 9 Lead Motor
Y-Connection
7
1
6789
456
12 3
Low Voltage
208/230 V
olts
High V
oltage
460 Volts
8
2
4
9
3
5
L
1
L
3
L
2
L1L3
L2
3 Phase, 9 Lead Motor
Delta-Connection
To reverse, interchange any two line leads.
2 Speed, 1 Winding, 3 Phase Motor
Motor
1
2
3
4
5
6
Together
High Speed
Line
L1
L2
L
3
1
2
3
4
5
6
Open
Low Speed
Line
L1
L2
L3
Motor
To reverse, interchange any two line leads. Motors require mag-
netic control.
2 Speed, 2 Winding, 3 Phase
L
1
T
1
T
2
T
3
Low Speed
Low Speed
Low Speed
High Speed
High Speed
High Speed
Motor
T
13
T
12
T
11
L
2
Line
L
3
To reverse:
High Speed - interchange leads T11 and T12.
Low Speed - interchange leads T1and T2.
Both Speeds - interchange any two line leads.
Typical Damper Motor Schematic
Fan
Motor
Damper
Motor*
Second
Damper
Motor
Tr
ansformer** Transformer*
*
L3
L2
L1
For 3-Phase, damper motor voltage should be the same be-
tween L1and L2. For single phase application, disregard L3.
*Damper motors may be available in 115, 230 and 460 volt mod-
els. The damper motor nameplate voltage should be veried pri-
or to connection.
**A transformer may be provided in some installations to correct
the damper motor voltage to the specied voltage.
Installation
Motor Installation
To prevent damage to the fan during shipping, motors
5HP and larger, and extremely heavy motors (cast iron or
severe duty) are shipped loose and must be eld mounted
by bolting the motor on the motor mounting plate in the ex-
isting mounting slots.
Wiring Installation
NOTICE! Lock o all power sources before unit is
wired to power source.
Leave enough slack in the wiring to allow for motor
movement when adjusting belt tension. Some fractional
motors have to be removed in order to make the connec-
tion with the terminal box at the end of the motor.
NOTICE! Follow the wiring diagram in the discon-
nect switch and the wiring diagram provided with
the motor. Correctly label the circuit on the main
power box and always identify a closed switch to
promote safety (i.e., red tape over a closed switch).
Wiring Diagrams
Single Speed, Single Phase Motor
T-
1
T-
4
Ground B
L2
L1
Ground A
Line
When ground is required, attach to ground A or B with No. 6
thread forming screw. To reverse, interchange T-1 and T-4.
2 Speed, 2 Winding, Single Phase Motor
Ground A
Ground B
T-1
T-
4
Low Speed
High Speed
L1
L2
Line
When ground is required, attach to ground A or B with No. 6 thread
forming screw. To reverse, interchange T-1 and T-4 leads.
Single Speed, Single Phase, Dual Voltage
Ground B
J-10
T-5
Ground A
Link A
Link B
Low Voltage
Line
L2
L1
Ground A
Link A
and B
L1
L2
Line
Ground B
T-5
J-10
When ground is required, attach to ground A or B with No. 6
thread forming screw. To reverse, interchange T-5 and J-10 leads.

3DB IO&M B51131-002
Belt and Pulley Installation
Belt tension is determined by the sound of the belts when
the fan is rst started. The belts will produce a loud squeal,
which dissipates after the fan is operating at full capacity.
If belt tension is too tight or too loose, lost efciency and
damage can occur.
Do not change the pulley pitch diameter to change ten -
sion. The change will result in a dierent fan speed.
Models SDB
1. Loosen the motor plate bolts and move the motor plate
(with motor installed) so that the belts can easily slip
into the grooves on the pulleys. Never pry, roll or force
the belts over the rim of the pulley.
2. Adjust the motor plate until proper tension is reached.
For proper tension, a deection of approximately 1/4”
per foot of center distance should be obtained by rm-
ly pressing the belt. Refer to Figure 1.
3. Lock the motor plate adjustment nuts in place.
4. Ensure pulleys are properly aligned. Refer to Figure 2.
1 foot
1/4 inch
Figure 1
All Other Fans
1. Loosen the pivoting motor base bolts and turn the ad-
justment screws to lower the motor base so that the
belts can easily slip into the grooves on the pulleys. Nev-
er pry, roll or force the belts over the rim of the pulley.
2. Adjust the motor plate until proper tension is reached.
For proper tension, a deection of approximately 1/4”
per foot of center distance should be obtained by rm-
ly pressing the belt. Refer to Figure 1.
3. Lock the motor plate adjustment nuts in place.
4. Ensure pulleys are properly aligned. Refer to Figure 2.
Figure 2
OFFSET ANGULAR OFFSET/ANGULAR
A
W
X
Y
Z
B
CENTER
DISTANCE
(CD)
GAP GAP
Tolerance
Center Distance Max.
Gap
Up through 12” 1/16”
12” up through 48” 1/8”
Over 48” 1/4”
Pulley Alignment
Pulley alignment is adjusted by
loosening the motor pulley set-
screw and by moving the motor
pulley on the motor shaft.
Figure 2 indicates where to mea-
sure the allowable gap for the drive
alignment tolerance. All contact
points (indicated by WXYZ) are to
have a gap less than the tolerance
shown in the table. When the pul-
leys are not the same width, the al-
lowable gap must be adjusted by half of the difference in
width. Figure 3 illustrates using a carpenter’s square to ad-
just the position of the motor pulley until the belt is parallel
to the longer leg of the square.
Final Installation Steps
1. Inspect fasteners and setscrews, particularly fan
mounting and bearing fasteners, and tighten accord-
ing to the recommended torque shown in the table,
Recommended Torque for Setscrews/Bolts.
2. Inspect for correct amperage and voltage with an am-
meter and voltmeter.
3. Ensure blower is secured to duct work.
4. Ensure all accessories are installed.
5. Inspect wheel-to-inlet clearance.
6. Test the fan to be sure the rotation is the same as indi-
cated by the arrow marked Rotation.
NOTICE! Do not allow the fan to run in the wrong
direction. This will overheat the motor and cause
serious damage. For 3-phase motors, if the fan is
running in the wrong direction, check the control
switch. It is possible to interchange two leads at
this location so that the fan is operating in the cor-
rect direction.
Recommended Torque for Setscrews/Bolts (IN-LB)
Setscrews Hold Down Bolts
Size
Key Hex
Across
Flats
Recommended
Torque Size Recommended
Torque
Min. Max.
#8 5/64” 15 21 3/8”-16 324
#10 3/32” 27 33 1/2”-13 780
1/4 1/8” 70 80 5/8”-11 1440
5/16 5/32” 140 160 3/4”-10 2400
3/8 3/16” 250 290 7/8”-9 1920
7/16 7/32” 355 405 1”-8 2700
1/2 1/4” 560 640 1-1/8”-7 4200
5/8 5/16” 1120 1280 1-1/4”-7 6000
3/4 3/8” 1680 1920 - -
7/8 1/2” 4200 4800 - -
19/16” 5600 6400 - -
Figure 3

4DB IO&M B51131-002
Operation
Pre-Start Checks
1. Lock out all the primary and secondary power sources.
2. Inspect fasteners and setscrews, particularly those
used for mounting the fan, and tighten if necessary.
3. Inspect belt tension and pulley alignment. (Remember,
if belt tension is correct, a loud squeal occurs as the
fan increases to full power.)
4. Inspect motor wiring.
5. Ensure the belt touches only the pulleys.
6. Ensure fan and ductwork are clean and free of debris.
7. Test the fan to ensure the rotation of the wheel is the
same as indicated by the rotation label.
8. Close and secure all access doors.
9. Restore power to unit.
Start Up
Turn on the fan. In variable speed units, set the fan to its
lowest speed. Inspect for the following:
• Direction of rotation
• Excessive vibration
• Unusual noise
• Bearing noise
• Improper belt alignment or tension (listen for a continuous
squealing noise)
• Improper motor amperage or voltage
NOTICE! If a problem is discovered, immediately shut
o the fan. Lock out all electrical power and check
for the cause of the trouble. Refer to Troubleshooting.
Inspection
Inspection of the fan should be conducted at the rst 30
minute, 8 hour and 24 hour intervals of satisfactory op-
eration. During the inspections, stop the fan and inspect
as per directions below.
30 Minute Interval
Inspect bolts, setscrews and motor mounting bolts. Ad-
just and tighten as necessary.
8 Hour Interval
Inspect belt alignment and tension. Adjust and tighten
as necessary.
24 Hour Interval
Inspect belt tension. Adjust and tighten as necessary.
Filters (if included)
Filters should be inspected within the rst two weeks of
operation. If there is no excessive build-up, monthly ser-
vicing should be adequate.
To clean reusable aluminum lters, back ush with soap
and water. When clean, shake off excess water and allow
the lter to air-dry before reinstalling it.
Maintenance
Establish a schedule for inspecting all parts of the fan.
The frequency of inspection depends on the operating
conditions and location of the fan.
Inspect fans exhausting corrosive or contaminated air
within the rst month of operation. Fans exhausting con-
taminated air (airborne abrasives) should be inspected ev-
ery three months.
Regular inspections are recommended for fans exhaust-
ing non-contaminated air.
It is recommended the following inspections be con-
ducted twice per year.
• Inspect bolts and setscrews for tightness. Tighten as
necessary
• Inspect belt wear and alignment. Replace worn belts with
new belts and adjust alignment as needed. See Belt and
Pulley Installation, page 3
• Bearings should be inspected as recommended in the
Conditions Chart
• Inspect for cleanliness. Clean exterior surfaces only. Re-
moving dust and grease on motor housing assures prop-
er motor cooling
Fan Bearings
The fan bearings are provided prelubricated. Any spe-
cialized lubrication instructions on fan labels supersedes
information provided herein. Bearing grease is a petro-
leum lubricant in a lithium base conforming to an NLGI #2
consistency. If user desires to utilize another type of lu-
bricant, they take responsibility for ushing bearings and
lines and maintaining a lubricant that is compatible with
the installation.
An NLGI #2 grease is a light viscosity, low-torque, rust-
inhibiting lubricant that is water resistant. Its temperature
range is from -30°F to 200°F and capable of intermittent
highs of 250°F.
Bearings should be relubricated in accordance with the
Conditions Chart below.
Conditions Chart
RPM Temp °F Greasing Interval
Up to 1000 -30 to 120 6 months
120 to 200 2 months
1000 to 3000 -30 to 120 3 months
120 to 200 1 month
Over 3000 -30 to 120 1 month
120 to 200 2 weeks
Any Speed < -30 Consult Factory
Any Speed > 200 1 week
For moist or otherwise contaminated installations; divide the inter-
val by a factor of three. For vertical shaft installations divide the in-
terval by a factor of two.
For best results, lubricate the bearing while the fan is in
operation. Pump grease in slowly until a slight bead forms
around the bearing seals. Excessive grease can damage
seal and reduce life through excess contamination and/or
loss of lubricant.
In the event that the bearing cannot be seen, use no more
than three injections with a hand operated grease gun.
Motor Bearings
Motors are provided with prelubricated bearings. Any lu-
brication instructions shown on the motor nameplate su-
persede instructions below.
Direct Drive 1050/1075, 1200, 1300 and 1500 RPM units
use a prelubricated sleeve bearing that has an oil-saturat-
ed wicking material surrounding it. The initial factory lubri-
cation is adequate for up to 10 years of operation under
normal conditions. However, it is advisable to add lubri-
cant after three years. Use only LIGHT grade mineral oil
or SAE 10W oil up to 30 drops. If the unit has been stored
for a year or more, it is advisable to lubricate as directed
above. For VCR direct drive units and other units in severe
conditions, lubrication intervals should be reduced to half.

5DB IO&M B51131-002
Motors without sleeve bearings (as described previous-
ly) will have grease lubricated ball or roller bearings. Motor
bearings without provisions for relubrication will operate
up to 10 years under normal conditions with no mainte-
nance. In severe applications, high temperatures or exces-
sive contaminates, it is advisable to have the maintenance
department disassemble and lubricate the bearings after
three years of operation to prevent interruption of service.
For motors with provisions for relubrication, follow inter-
vals of the table below.
Relubrication Intervals
Service
Conditions
NEMA Frame Size
Up to and
Including 184T 213T–365T 404T and Larger
1800
RPM and
Less
Over
1800
RPM
1800
RPM and
Less
Over
1800
RPM
1800
RPM and
Less
Over
1800
RPM
Standard 3 years 6 months 2 years 6 months 1 year 3 months
Severe 1 year 3 months 1 year 3 months 6 months 1 month
Motors are provided with a polyurea mineral oil NGLI #2
grease. All additions to the motor bearings are to be with
a compatible grease such as Exxon Mobil Polyrex EM and
Chevron SRI.
The above intervals should be reduced to half for verti-
cal shaft installations.
Motor Services
Should the motor prove defective within a one-year pe-
riod, contact your local Loren Cook representative or your
nearest authorized electric motor service representative.
Changing Shaft Speed
All belt driven Propeller Wall fans with motors up to and
including 5HP are equipped with variable pitch pulleys. To
change the fan speed, perform the following:
1. Loosen setscrew on driver (motor) pulley and remove
key, if equipped.
2. Turn the pulley rim to open or close the groove facing.
If the pulley has multiple grooves, all must be adjusted
to the same width.
3. After adjustment, inspect for proper belt tension.
Speed Reduction
Open the pulley in order that the belt rides deeper in the
groove (smaller pitch diameter).
Speed Increase
Close the pulley in order that the belt rides higher in the
groove (larger pitch diameter). Ensure that the RPM lim-
its of the fan and the horsepower limits of the motor are
maintained.
Maximum RPM
SDB
Size
Maximum
RPM
100 2795
120 2486
135 2281
150 2088
180 1727
210 1399
245 1284
TDB
Size
Maximum
RPM
91469
10 1382
13 1094
15 1030
18 907
DB/DBX
Size
Maximum
RPM
81494
91594
10 1382
13 1094
15 973
18 906
Pulley and Belt Replacement
1. Clean the motor and fan shafts.
2. Loosen the motor plate mounting bolts to relieve the
belt tension. Remove the belt.
3. Loosen the pulley setscrews and remove the pulleys
from the shaft.
• If excessive force is required to remove the pulleys, a
three-jaw puller can be used. This tool, however, can eas-
ily warp a pulley. If the puller is used, inspect the trueness
of the pulley after it is removed from the shaft. The pulley
will need replacement if it is more than 0.020” out of true.
4. Clean the bores of the pulleys and place a light coat of
oil on the bores.
5. Remove grease, rust and burrs from the shaft.
6. Place fan pulley on the fan shaft and the motor pulley
on the motor shaft. Damage to the pulleys can occur
when excessive force is used in placing the pulleys on
their respective shafts.
7. After the pulleys have been correctly placed back onto
their shafts, tighten the pulley setscrews.
8. Install the belts on the pulleys. Align and adjust the
belts to the proper tension as described in Belt and
Pulley Installation, page 3.
Bearing Replacement
If you have a model DB or TDB, the fan bearings are
permanently sealed and will not require replacement.
If you have a model SDB or DBX, the fan bearings are
pillow block ball bearings. Follow the instructions below for
replacement.
1. Loosen screws on bearing cover.
2. Push bearing cover toward the wheel. As the bearing
cover moves toward the wheel, it will slide down to re-
veal the bearings and shaft.
3. Remove the old bearing.
4. Remove any burrs from the shaft by sanding.
5. Slide new bearings onto the shaft to the desired lo-
cation and loosely mount bearings onto the bearing
support. Bearing bolts and setscrews should be loose
enough to allow shaft positioning.
6. Correctly position the wheel and tighten the bearing
bolts securely to the bearing support.
7. Align setscrews bearing to bearing and secure tightly
to the shaft.
NOTICE! Never tighten both pairs of setscrews be-
fore securing bearing mounting bolts. This may
damage the shaft.
8. Inspect the wheel position again. If necessary, re-
adjust by loosening the bearing bolts and setscrews
and repeat from step 5.

6DB IO&M B51131-002
Wheel Replacement
SDB
1. Drill two holes approximately centered between the
shaft and the edge of the hub OD with the following
dimensions:
• 1/4” diameter
• 3/8” to 1/2” deep
• 180° apart in face of hub
2. Tap 1/4” holes to 5/16” thread with the 5/16” hole tap.
Do not drill or tap any larger than recommended.
3. Screw the puller arms into the tapped holes full depth
of threads (3/8” to 1/2” approximately). Align center of
puller with center of shaft. Make certain all setscrews
in hub (normally a quantity of two) are fully removed.
Work puller slowly to back wheel off the shaft.
Recommended Puller
Lisle No. 45000 Steering Wheel Puller. This puller is
available at most automotive parts retail outlets.
Wheel PullerDrilled Hole Location
Troubleshooting
Problem and Potential Cause
Low Capacity or Pressure:
• Incorrect direction of rotation. Make sure the fan rotates
in same direction as the arrows on the motor or belt drive
assembly
• Poor fan inlet conditions. There should be a straight clear
duct at the inlet
• Improper wheel alignment
Excessive Vibration and Noise:
• Damaged or unbalanced wheel
• Belts too loose; worn or oily belts
• Speed too high
• Incorrect direction of rotation. Make sure the fan rotates
in same direction as the arrows on the motor or belt drive
assembly
• Bearings need lubrication or replacement
• Fan surge
Overheated Motor:
• Motor improperly wired
• Incorrect direction of rotation. Make sure the fan rotates
in same direction as the arrows on the motor or belt drive
assembly
• Cooling air diverted or blocked
• Improper inlet clearance
• Incorrect fan RPMs
• Incorrect Voltage
Overheated Motor:
• Improper bearing lubrication
• Excessive belt tension

7DB IO&M B51131-002
Parts List
DB and TDB
12
13
TDB
DB
1234
5
6
7
8
9
10
Airflow
11
Part No. Description
DB TDB
1Motor Motor
2Rubber Isolators (4) Rubber Isolators (8)
3 Pivoting Motor Base Pivoting Motor Base
4Hanger Channel (2) Hanger Channel (2)
5 Blower Bracket (2) Blower Bracket (3)
6Bearings (2) Bearings (4)
7Blower Blower (2)
8Driven Sheave Driven Sheave
9Shaft Shaft
10 Belt Set Belt Set
11 Driver Sheave Driver Sheave
12 Outlet Flange Outlet Flange (2)
13 Wheel Wheel (2)

8DB IO&M B51131-002
Limited Warranty
Loren Cook Company warrants that your Loren Cook fan was manufactured free of defects in materials and workmanship, to the extent stated herein.
For a period of one (1) year after date of shipment, we will replace any parts found to be defective without charge, except for shipping costs which will be
paid by you. This warranty is granted only to the original purchaser placing the fan in service. This warranty is void if the fan or any part thereof has been
altered or modied from its original design or has been abused, misused, damaged or is in worn condition or if the fan has been used other than for the
uses described in the company manual. This warranty does not cover defects resulting from normal wear and tear. To make a warranty claim, notify Loren
Cook Company, General Ofces, 2015 East Dale Street, Springeld, Missouri 65803-4637, explaining in writing, in detail, your complaint and referring to
the specic model and serial numbers of your fan. Upon receipt by Loren Cook Company of your written complaint, you will be notied, within thirty (30)
days of our receipt of your complaint, in writing, as to the manner in which your claim will be handled. If you are entitled to warranty relief, a warranty ad-
justment will be completed within sixty (60) business days of the receipt of your written complaint by Loren Cook Company. This warranty gives only the
original purchaser placing the fan in service specically the right. You may have other legal rights which vary from state to state. For fans provided with
motors, the motor manufacturer warrants motors for a designated period stated in the manufacturer’s warranty. Warranty periods vary from manufacturer
to manufacturer. Should motors furnished by Loren Cook Company prove defective during the designated period, they should be returned to the nearest
authorized motor service station. Loren Cook Company will not be responsible for any removal or installation costs.
Corporate Ofces: 2015 E. Dale St. Springeld, MO 65803
Phone [phone] | Fax [phone] | lorencook.com
July 2017
SDB and DBX
2
1
3
4
5
8
9
10
AIRFLOW
11
12
13
7
6
Part No. Description
SDB (Sizes 100–180) SDB (Sizes 210–245) DBX (Sizes 10–18)
1Rubber Isolators (4) Rubber Isolators (4) Rubber Isolators (4)
2Hanger Channel (2) Hanger Channel (2) Hanger Channel (2)
3Driver Sheave Driver Sheave Driver Sheave
4Motor Motor Motor
5 Pivoting Motor Base (shown) Pivoting Motor Base (not shown) Pivoting Motor Base (shown)
6 Belt Set Belt Set Belt Set
7Driven Sheave Driven Sheave Driven Sheave
8Blower Blower Blower
9 Blower Brackets (2) Blower Brackets (2) Blower Brackets (2)
10 Outlet Flange Outlet Flange Outlet Flange
11 Wheel Wheel Wheel
12 Shaft Shaft Shaft
13 Bearings (3) Bearings (3) Bearings (3)