COOK SQN User Manual
A
INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
This publication contains the installation, operation and
maintenance instructions for standard units of the SQN
Centrifugal Square Inline Fans.
Carefully read this publication and any supplemental documents prior to any installation or
maintenance procedure.
Loren Cook catalog SQN 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)869-6474, extension
166; by FAX at (417)832-9431; or by e-mail at
info@lorencook.com.
For information on special equipment, contact Loren Cook
Company Customer Service Department at (417)869-6474.
SQN
Centrifugal Square Inline Fans
SQN-B
Rotating Parts & Electrical Shock Hazard:
Disconnect electric power before working on unit.
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 emergency and in order that maintenance
personnel are provided complete control of the power
source.
Grounding is required. All field-installed wiring must
be completed by qualified personnel. All fieldinstalled wiring must comply with National Electric
Code (NFPA 70) and all applicable local codes.
Failure to follow these instructions could result in
death or serious injury.
Storage
If the fan is stored for any length of time prior to installation, completely fill the bearings with grease or moistureinhibiting oil. Refer to Lubricants on page 6. Also, store the
fan in its original crate and protect it from dust, debris and
the weather.
To maintain good working condition of a SQN when it is
stored outdoors, or on a construction site, follow the additional steps below:
• Cover the inlet and outlet, and belt tunnel opening to
prevent the accumulation of dirt and moisture in the
housing.
• Periodically rotate the wheel and operate dampers (if
supplied) to keep a coating of grease on all internal
bearing parts.
• Periodically inspect the unit to prevent damaging conditions.
Receiving and Inspection
Immediately, upon receipt of an SQN fan, carefully inspect
the fan and accessories for damage and shortage.
• Turn the wheel by hand to ensure it turns freely and does
not bind.
• Inspect dampers for free operation of all moving parts.
• Record on the Delivery Receipt any visible sign of damage.
Handling
Lift the fan by the outside housing (box). NOTICE! Never
lift by the shaft or motor.
Motor Plate
djustment Nut
Motor Plate
Motor Plate Adjustment
Wiring Diagrams
Single Speed, Single Phase Motor
Ground A
L
T-5
J-10
1
Line
L
2
Ground B
High Speed
L
1
L
2
Low Speed
Ground A
Link A & B
Line
L
Line
L
1
2
T-1
T-4
Ground B
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
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.
Single Speed, Single Phase, Dual Voltage
Ground A
L
Line
L
1
2
T-5
J-10
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.
Link A
Link B
Low Voltage
Typical Damper Motor Schematic
Wiring Diagrams
3 Phase, 9 Lead Motor
Y-Connection
Low Voltage
208/230 Volts
4
5
6
3
1
9
728
L2L
L
3
1
To reverse, interchange any 2 line leads.
High Voltage
460 Volts
456
789
3
12
L2L
L
1
2 Speed, 1 Winding, 3 Phase Motor
High Speed
1
Together
2
Motor
To reverse, interchange any 2 line leads. Motors require magnetic control.
3
L
4
1
L
5
2
6
L
3
2 Speed, 2 Winding, 3 Phase
To reverse: High Speed-interchange leads T
Low Speed-interchange leads T1 and T2. Both Speeds-interchange any 2
line leads.
3 Phase, 9 Lead Motor
Delta-Connection
Low Voltage
208/230 Volts
8
7
4
6
2
1
3
Line
L
1
L
2
Motor
11
L
3
Low Speed
and T12.
High Voltage
1
2
3
4
5
6
460 Volts
789
456
12
L
L
1
2
L
1
L
2
Line
L
3
Open
3
L
3
9
5
3
Fan
Motor
Transformer**
Damper
Motor*
Transformer**
Second
Damper
Motor
L3
L2
L1
For 3 phase, damper motor voltage should be the same between L1 and
L2. For single phase application, disregard L3. *Damper motors may be
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.
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.
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.
Direct drive - Wire the electrical box on the blower housing.
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 connection with the terminal box at the end of the motor. To
remove motor, remove bolts securing motor base to power
assembly. Do not remove motor mounting bolts.
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).
2
1/4 inch
1 foot
Figure 1
Belt and Pulley Installation
If your fan is a direct drive, proceed to Blower Installa-
tion.
Belt tension is determined by the sound the belts make
when the fan is first started. Belts will produce a loud
squeal which dissipates after the fan is operating at full
capacity. If the belt tension is too tight or too loose, lost efficiency and possible damage can occur.
Do not change the pulley pitch diameter to change tension. This will result in a different fan speed.
a. Loosen motor plate adjustment nuts on L-bolts and
move motor plate in order 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 Figure1.
c. Lock the motor plate adjustment nuts in place.
d. Ensure pulleys are properly aligned. Refer to Figure
2.
Tolerance
Center Distance
Up thru 12” 1/16”
12” up through 48 1/8”
Over 48” 1/4”
Maximum
Gap
OFFSET ANGULAR OFFSET/ANGULAR
A
W
square to adjust the position of the motor pulley until the belt is parallel to the longer leg of
the square.
Blower Installation
The blower is shipped with the motor in the
12 o’clock position and the feet are shipped
loose.
a. Upon receipt of the fan, remove the
Figure 3
eight (8) feet shipped with the fan and ensure the feet
are the correct type. Refer to Figure 4.
b. Determine how the fan is to be mounted. Refer to
Figure 5.
c. Remove the 5/16” bolt(s) from the corner of the hous-
ing in which the foot is to be attached.
d. Place the foot over the open bolt hole(s) and bolt the
foot to the unit. Refer to Figure 4.
Foot Mounting Illustrations
Sizes 70 - 135
Sizes 150 - 225 Sizes 245 - 402
iew of A or E Foot Assembly
Figure 4
Figure 2
X
Y
Z
B
CENTER
DISTANCE
(CD)
GAP
GAP
Pulley Alignment
Pulley alignment is adjusted by loosening the motor pulley
setscrew and by moving the motor pulley on the motor 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
3
(A)
Not on direct drive
Figure 5
Not on direct drive
Not on direct drive
(D)
(B)
Not on direct drive
(E)
(C)
Not on direct drive
SQN Optional Side Discharge Installation
Upon receiving a SQN for a side discharge installation,
please note that the rear discharge block-off panel is
installed on the unit and that the correct number of side discharge duct connection collars are provided (4 steel
flanges for a single side discharge and 8 for dual).
To install the side discharge duct connection collar,
remove the appropriate access door. Install the side discharge duct connection collar using the bolts that were
removed with the access door. Then connect the duct work.
See page 5 for examples.
Side Discharge
Duct Connection
Rear Discharge
Block-off Panel
Collar
NOTICE! Original Loren Cook Company labels must
remain with the unit. This may require swapping
access doors from one side to the other.
Final Installation Steps
a. Ensure that all accessories are installed.
b. Ensure that the blower is secured to ductwork.
c. Inspect wheel-to-inlet clearance. Ensure wheel does
not rub against the inlet.
d. Test the fan to ensure the rotation of the wheel is the
same as indicated by the rotation label.
e. Inspect for correct amperage with an ammeter and
correct voltage with a voltmeter.
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 correct direction.
Operation
Pre-Start Checks
a. Lock out all the primary and secondary power
sources.
b. Inspect and tighten fasteners and setscrews, particu-
larly fan mounting and bearing fasteners. Refer to
Torque chart.
c. Inspect belt tension and pulley alignment.
d. Inspect motor wiring.
e. Ensure fan and ductwork are clean and free of
debris.
f. Close and secure all access doors.
g. Restore power to the fan.
Recommended Torque for Setscrews/Bolts (IN/LB.)
Setscrews
Size
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
Key Hex
Across
Flats
Recommended
Torque
Min. Max. Size
Hold Down Bolts
Wrench
Torque
Start Up
Turn the fan on. In variable speed units, set the fan to its
lowest speed and inspect for the following:
• Direction of rotation.
• Excessive vibration.
• Unusual noise.
• Bearing noise.
• Improper belt alignment or tension (listen for squealing).
• Improper motor amperage or voltage.
NOTICE! If a problem is discovered, immediately shut
the fan off. Lock out all electrical power and check for
the cause of the trouble. See Troubleshooting on page
7.
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
the chart 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.
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 contaminated air (airborne abrasives) should be inspected
every three months.
Yearly 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. Refer to Torque chart.
• Inspect belt wear and alignment. Replace worn belts
with new belts and adjust alignment as needed. Refer
to Belt and Pulley Installation.
• Bearings should be inspected as recommended in the
Conditions Chart.
4
Loading...