Disconnect switches are recommended. Place the
disconnect switch near the fan in order that the
power can be swiftly cut off in case of an emergency, and in order that maintenance personnel are
provided complete control of the power source.
WARNING
This unit has rotating parts. Safety precautions
should be exercised at all times during installation,
operation, and maintenance.
ALWAYS disconnect power prior to working on fan.
This publication contains the installation, operation
and maintenance procedures for standard units of the
DB - Ceiling, Wall and Cabinet Fans.
•DB/TDB
•SDB/DBX
Carefully read this publication prior to any installation or maintenance procedure.
Loren Cook catalog, DB, provides additional information
describing the equipment, fan performance, available
accessories and specification data.
For additional safety information, refer to AMCA publication 410-96, Safety Practices for Users and Installers ofIndustrial and Commercial Fans.
All of the publications listed above can be obtained from
Loren Cook Company by phoning 417/869-6 47 4, extension
166; by FAX at 417/832-9431; or by e-mail at info@lorencook.com.
For information and instructions on special equipment,
contact Loren Cook Company at 417/869-6474.
Receiving and Inspection
Carefully inspect the fan and accessories for any damage and shortage immediately upon receipt of the fan.
• Turn the wheel by hand to ensure it turns freely and
does not bind.
• Inspect dampers (if included) for free operation of all
moving parts.
• Record on the Delivery Receipt any visible sign of
damage.
Duct Blower
Cabinet Fans
Wiring Installation
All wiring should be in accordance with local ordinances
and the National Electrical Code, NFPA 70. Ensure the
power supply (voltage, frequency, and current carrying
capacity of wires) is in accordance with the motor nameplate. Refer to the Wiring Diagrams, on page 2.
Lock off all power sources before unit is wired to power
source.
Leave enough slack in the wiring to allow for motor m ovement when adjusting belt tension. Some fractional motors
have to be removed in order to make the connection with
the terminal box at the end of the motor.
Follow the wiring diagram in the disconnect 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).
Handling
Lift fan by the base or lifting eyes. Never lift by the shaft,
motor, or housing.
Storage
If the fan is stored for any length of time prior to installation, store it in its original shipping crate and protect it from
dust, debris and the weather.
Installation
Motor Installation
To prevent damage to the fan during shipping, motors 5
HP and larger, and extremely heavy motors (cast iron or
severe duty) are shipped loose and must be field mounted
by bolting the motor on the motor mounting plate in the
existing mounting slots.
DB/DBX
Page 2
1 foot
1/4 inch
4
5
6
1
728
3
9
L
1
L2L
3
456
789
12
3
L
1
L2L
3
Low Voltage
208/230 Volts
High Voltage
460 Volts
3 Phase, 9 Lead Motor
Y-Connection
7
1
6
789
456
12
3
Low Voltage
208/230 Volts
High Voltage
460 Volts
8
2
4
9
3
5
L1L
3
L
2
L
1
L
3
L
2
3 Phase, 9 Lead Motor
Delta-Connection
Fan
Motor
Damper
Motor*
Second
Damper
Motor
T
ransformer**
T
ransformer**
L3
L2
L1
Wiring Diagrams
Wiring Diagrams
Single Speed, Single Phase Motor
Ground A
L
T-1
T-4
Ground B
1
Line
L
2
When ground is required, attach to ground A or B with no. 6 thread forming
screw. To reverse, interchange T-1 and T-4.
To reverse, interchange any 2 line leads.
2 Speed, 2 Winding, Single Phase Motor2 Speed, 1 Winding, 3 Phase Motor
Ground A
T-1
T-4
Ground B
When ground required, attach to ground A or B with No. 6 thread forming
screw. To reverse, interchange T-1 and T-4 leads.
High Speed
L
1
L
2
Low Speed
Line
1
Together
2
Motor
3
L
1
4
L
5
2
6
Line
L
3
Motor
To reverse, interchange any 2 line leads. Motors require magnetic control.
Single Speed, Single Phase, Dual Voltage2 Speed, 2 Winding, 3 Phase
Ground A
L
T-5
J-10
Ground B
Link A
Link B
Low Voltage
Line
L
1
T-5
J-10
2
Ground B
When ground required, attach to ground A or B with No. 6 thread forming
screw. To reverse, interchange T-5 and J-10 leads.
Ground A
Link A & B
High Voltage
L
1
Line
L
2
T
Low Speed
3
Low Speed
T
2
Low Speed
T
Motor
T
T
T
1
11
12
13
High Speed
High Speed
High Speed
To reverse: High Speed-interchange leads T11 and T12.
Low Speed-interchange leads T
line leads.
and T2. Both Speeds-interchange any 2
1
Typical Damper Motor Schematic
Low SpeedHigh Speed
L
1
1
L
2
3
4
5
6
2
L
3
Open
Line
L
L
L
1
2
Line
3
Belt and Pulley Installation
Belt tension is determined by the sound of the belts whe n
the fan is first started. The belts will produce a loud squeal,
which dissipates after the fa n is operatin g at full capacity. If
belt tension is too tight or too loose, lost efficiency and
damage can occur.
Do not change the pulley pitch diameter to change tension. The change will result in a different fan speed.
Models SDB
a. 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.
b. Adjust the motor plate until proper tension is reached.
For 3 phase, damper motor voltage should be the same between L1 and
. For single phase application, disregard L3. *Damper motors may be
L
2
available in 115, 230 and 460 volt models. The damper motor nameplate
voltage should be verified prior to connection. ** A transformer may be provided in some installations to correct the damper motor voltage to the
specified voltage.
For proper tension, a deflection of approximately 1/4”
per foot of center distance should be obtained by
firmly pressing the belt. Refer to Figure 1.
c. Lock the motor plate adjustment nuts in place.
d. Ensure pulleys are properly aligned. Refer to Figure 2.
a. Loosen the pivoting motor base bolts and turn the
adjustment screws to lower the motor base 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.
b. Adjust the motor plate until proper tension is reached.
For proper tension, a deflection of approximately 1/4”
per foot of center distance should be obtained by
firmly pressing the belt. Refer to Figure 1.
c. Lock the motor plate adjustment nuts in place.
d. Ensure pulleys are properly aligned. Refer to Figure 2.
OFFSETANGULAROFFSET/ANGULAR
A
W
B
CENTER
DISTANCE
(CD)
X
Y
Z
Pulley Alignment
Pulley alignment is adjusted by loosening the motor pulley
setscrew and by moving the motor pulley on the m otor shaft.
Figure 2 indicates where to measure
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 pulleys are not the
same width, the allowable gap must
be adjusted by half of the difference in
width. Figure 3 illustrates using a carpenter’s square to adjust the position
of the motor pulley until the belt is parallel to the longer leg of the square.
Figure 3
Final Installation Steps
a. Inspect fasteners and setscrews, par-
ticularly fan mounting and bearing
fasteners, and tighten according to
the recommended torque shown in
the table, Recommended Torque for Setscrews/Bolts.
b. Inspect for correct amperage and
voltage with an ammeter and voltme-
ter.
c. Ensure blower is secured to duct work.
d. Ensure all accessories are installed.
e. Inspect wheel-to-inlet clearance.
f. Test the fan to be sure the rotation is the same as indi-
Do not allow the fan to run in the wrong direction.
cated by the arrow marked Rotation.
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 possi-
GAP
GAP
ble to interchange two leads at this location so that the
fan is operating in the correct direction.
Operation
Pre-Start Checks
a. Lock out all the primary and secondary power sources.
b. Inspect fasteners and setscrews, particularly those
used for mounting the fan, and tighten if necessary.
c. Inspect belt tension and pulley alignment. (Remember,
if belt tension is correct, a loud squeal occurs as the
fan increases to full power.)
d. Inspect motor wiring.
e. Ensure the belt touches only the pulleys.
f. Ensure fan and ductwork are clean and free of debris.
g. Test the fan to ensure the rotation of the wheel is the
same as indicated by the rotation label.
h. Close and secure all access doors.
i. Restore power to unit.
Start Up
Turn the fan on. 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.
If a problem is discovered, immediately shut off the
fan. Lock out all electrical power and check for the
cause of the trouble. Refer to Troubleshooting, page 5.
Inspection
Inspection of the fan should be conducted at the first 30
minute, 8 hour and 24 hour intervals of satisfactory opera-
tion. During the inspections, stop the fan and inspect as per
directions below.
30 Minute Interval
Inspect bolts, setscrews, and motor mounting bolts.
Adjust 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.
Inspection of the fan should be co nducted at the first 30minute, 8 hour and 24 hour intervals of satisfactory operation. During the inspections, stop the fan and inspect as per
directions below.
30 Minute Interval
Inspect bolts, setscrews, and motor mounting bolts.
Adjust 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 first two weeks of
operation. If there is no excessive build-up, monthly servicing should be adequate.
To clean reusable aluminum filters, back flush with soap and
water. When clean, shake off excess water and allow the filter 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 first month of operation. Fans exhausting conta minated air (airborne abrasives) should be inspected every
three months.
Regular inspections are recommended for fans exhausting non-contaminated air.
It is recommended the following inspections be conducted
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 need ed. See Belt and Pulley Installation, page 2.
• Bearings should be inspected as recommended in the
Conditions Chart.
• Inspect for cleanliness. Clean exterior surfaces only.
Removing dust and grease on motor housing assures
proper motor cooling.
Fan Bearings
The fan bearings are provided prelubricated. Any spe cialized lubrication instructions on fan labels supercedes information provided herein. Bearing grease is a petroleum
lubricant in a lithium base conforming to a NLGI #2 consistency . If user desires to utilize another type of lubricant, they
take responsibility for flushing bearings and lines, and maintaining a lubricant that is compatible with the installation.
A NLGI #2 grease is a light viscosity, low-torque, rustinhibiting 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
condition chart below.
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.
Conditions Chart
RPMTemp °FGreasing Interval
Up to 1000
1000 to 3000
Over 3000
Any Speed< -30Consult Factory
Any Speed> 2001 week
For moist or otherwise contaminated installations; divide the interval by a
factor of 3. For vertical shaft installations divide the interval by a factor of 2.
-30 to 1206 months
120 to 2002 months
-30 to 1203 months
120 to 2001 month
-30 to 1201 month
120 to 2002 weeks
Motor Bearings
Motors are provided with prelubricated bearings. Any
lubrication instructions shown on the motor nameplate
supersede instructions below.
Direct Drive 1050/1075,1200,1300 &1500 rpm units use
a prelubricated sleeve bearing that has a oil saturated wicking material surrounding it. The initial factory lubrication is
adequate for up to 10 years of operation under normal conditions. However, it is advisa ble to add lubricant after 3
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 cond itions, lubrication
intervals should be reduced to half.
Motors without sleeve bearings (as described above) 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 maintenance. In
severe applications, high temperatures or excessive contaminates, it is advisable to have the maintenance department disassemble and lubricate the bear in gs after 3 years
of operation to prevent interruption of service.
For motors with provisions for relubrication, follow intervals of the table below.
4
Page 5
Motors are provided with a polyurea mineral oil NG LI #2
grease. All additions to the motor bearings are to be with a
compatable grease such as Exxon Mo bil Polyrex EM and
Chevron SRI.
The above intervals should be reduced to half for vertical
shaft installations.
Motor Services
Should the motor prove defective within a one-year
period, 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:
a. Loosen setscrew on driver (motor) pulley and remove
key, if equipped.
b. Turn the pulley rim to open or close the groove fa cing.
If the pulley has multiple grooves, all must be adjusted
to the same width.
c. After adjustment, inspect for proper belt tension.
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 limits
of the fan and the horsepower limits of the motor are maintained.
Maximum
RPM
TDB
Size
Maximum
RPM
Replacing Pulleys and Belts
a. Clean the motor and fan shafts.
b. Loosen the motor plate mounting bolts to relieve the
belt tension. Remove the belt.
c. 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, how-
ever, can easily 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 inch out of
true.
d. Clean the bores of the pulleys and place a light coat of
oil on the bores.
e. Remove grease, rust and burrs from the shaft.
f. 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.
g. After the pulleys have been correctly placed back onto
their shafts, tighten the pulley setscrews.
h. Install the belts on the pulleys. Align and adjust the
belts to the proper tension as described in Belt and Pul-
ley Installation, page 2.
Bearing Replacement
If you have a model DB or TDB, the fan bearings are per-
manently 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.
a. Loosen screws on bearing cover.
b. Push bearing cover toward the wheel. As the bearing
cover moves toward the wheel it will slide down to
reveal the bearings and shaft.
c. Remove the old bearing.
d. Remove any burrs from the shaft by sanding.
e. Slide new bearings onto the shaft to the desired loca-
tion and loosely mount bearings onto the bearing sup-
port. Bearing bolts and setscrews should be loose
enough to allow shaft positioning.
f. Correctly position the wheel and tighten the bearing
bolts securely to the bearing support.
g. Align setscrews bearing to bearing and secure tightly
to the shaft. Do not tighten both pairs of setscrews
before securing bearing mounting bol t s. This may dam-
age the shaft.
h. Inspect the wheel position again. If necessary , readjust
by loosening the bearing bolts and setscrews and
repeat from step e.
Wheel Replacement—SDB
a. 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
b. Tap 1/4” holes to 5/16” thread with the 5/16” hole tap.
Do not drill or tap any larger than recommended.
c. 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 cert ain all setscrews in
hub (normally a quantity of two) are fully removed.
Work puller slowly to back wheel off the shaft.
5
Page 6
Recommended Puller
Above - Drilled hole placement.
Right - Wheel puller.
Lisle No. 45000 Steering Wheel Puller. This puller is available at most automotive parts retail outlets.
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 Bearings
•Improper bearing lubrication
•Excessive belt tension.
6
Page 7
DB and TDB Parts List
1
2
3
4
5
6
Airflow
11
10
9
8
7
12
13
DB
Part No.
1MotorMotor
2Rubber Isolators (4)Rubber Isolators (8)
3Pivoting Motor BasePivoting Motor Base
4Hanger Channel (2)Hanger Channel (2)
5Blower Bracket (2)Blower Bracket (4)
6Bearings (2)Bearings (4)
7BlowerBlower (2)
8Driven Sheave Driven Sheave
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 th e fan or any pa rt thereof has been alt ered or modif ied from its original d esign or has been abused, misused, damaged or is in worn condition or if the fan has been used othe r t han for the uses described in th e compan y manual . This warran ty does not cover d efects result ing fr om
normal wear and tear. To make a warranty claim, notify Loren Cook Company, General Offices, 2015 East Dale Street, Springfield, Missouri 65803-4637, explaining in writing,
in detail, your complaint and referring to the specific model and serial numbers of your fan. Upon receipt by Loren Cook Company of your written complaint, you will be notified,
within thirty (30) days of our receipt of your complaint, in writing, as to the manner in which your claim will be handled. I f you are ent itled to warra nty relief, a war ranty adjustment
will be completed within sixty (60) business days of the receipt of your written compla int by Loren Co ok Company. This warrant y gives only the or iginal pur chaser p lacing the fa n
in service specifically the right. You may have other legal rights which vary from state to state.
Corporate Offices: 2015 E. Dale Street Springfield, MO 65803 417.869.6474
lorencook.com
8
DB IOM - November 2007
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