Loren Cook DBX Installation Manual
INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
Personal Safety
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 of
Industrial 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
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 Motor 2 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 Voltage 2 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.
Figure 1
2
All other fans
Figure 2
Tolerance
Center Distance
Maximum
Gap
Up thru 12” 1/16”
12” up through 48 1/8”
Over 48” 1/4”
Recommended Torque for Setscrews/Bolts (IN/LB.)
Setscrews
Hold Down Bolts
Size
Key Hex
Across
Flats
Recommended
Torque
Min. Max. Size
Wrench
Torque
No.10 3/32” 28 33 3/8”-16 240
1/4” 1/8” 66 80 1/2”-13 600
5/16” 5/32” 126 156 5/8”-11 1200
3/8” 3/16” 228 275 3/4”-10 2100
7/16” 7/32” 348 384 7/8”-9 2040
1/2” 1/4” 504 600 1”-8 3000
5/8” 5/16” 1104 1200 1-1/8”-7 4200
3/4” 3/8” 1440 1800 1-1/4”-7 6000
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.
OFFSET ANGULAR OFFSET/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.
3
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