SQI
Square Centrifugal Inline Fan
INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
This publication contains the installation, operation and
maintenance instructions for standard units of the SQI
Square Centrifugal Inline Fans.
Carefully read this publication and any
supplemental documents prior to any
installation or maintenance procedure.
Loren Cook catalog SQI 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.
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 fan is stored for any length of time, prior to installation,
completely fill bearings with grease or moisture-inhibiting
oil. Refer to page 4. Store the fan in its original crate and
protect from dust, debris, and weather. To maintain good
working condition of a SQL when it’s stored outdoors, or on
a construction site follow the additional steps below.
• Cover the inlet and outlet, and belt tunnel opening to
prevent accumulation of dust 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.
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.
Wiring Installation
NOTICE! 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 3.
Direct drive - Wire the electrical box on the blower
housing.
Belt drive - The motor can be wired directly since the
motor is external to the fan.
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 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.
SQI-B
Motor Plate
Motor Plate
Adjustment Nut
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
Motor Plate Adjustment
Wiring Installation (continued)
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.
Belt and Pulley Installation
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.
1/4 inch
1 foot
Figure 2
X
Y
Z
B
CENTER
DISTANCE
(CD)
GAP
GAP
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
Figure 3
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.
Figure 1
Do not change the pulley pitch diameter to change ten-
sion. This will result in a different fan speed.
a. Loosen motor plate adjustment nuts on stud 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.
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 square to
adjust the position of the motor pulley until the belt is parallel to the longer leg of the square.
Operation
Pre-Start Checks
a. Lock out all the primary and secondary power sources.
b. Inspect and tighten fasteners and setscrews, particularly 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.
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.
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.
2
Wiring Diagrams
Single Speed, Single Phase Motor
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
L
T-5
J-10
Link A
Link B
Low Voltage
Ground B
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-1 and T-4 leads.
Single Speed, Single Phase, Dual Voltage
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-5 and J-10 leads.
High Speed
Low Speed
Typical Damper Motor Schematic
Fan
Motor
Transformer**
Damper
Motor*
Second
Damper
Motor
Transformer**
Ground A
Link A & B
L
1
Line
L
2
For 3 phase, damper motor voltage should be the
L3
same between L1 and L2.
L2
For single phase applica-
L1
tion, 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.
L
Line
L
Wiring Diagrams
3 Phase, 9 Lead Motor
Y-Connection
Low Voltage
208/230 Volts
4
5
6
3
1
9
728
L2L
L
1
3
High Voltage
460 Volts
456
789
12
L
1
To reverse, interchange any 2 line leads.
2 Speed, 1 Winding, 3 Phase Motor
High Speed
1
Together
1
Motor
2
2
3
L
4
L
5
6
L
To reverse, interchange any 2 line leads. Motors require magnetic control.
2 Speed, 2 Winding, 3 Phase
To reverse: High Speed-interchange leads T11 and T12.
Low Speed-interchange leads T1 and T2. Both Speeds-interchange any 2
line leads.
SQI-D 70-90
White Line
Black (High)
Blue (Medium)
Red (Low)
NOTE: Insulate Unused Leads Separately
FSC
SQI-D
FAN*
3 Phase, 9 Lead Motor
Delta-Connection
Low Voltage
208/230 Volts
8
7
4
6
2
1
3
L
L
1
L2L
3
2
1
2
Line
3
WHITE
9
5
3
L
3
Low Speed
Motor
High Voltage
460 Volts
789
456
12
L1L
1
2
3
4
5
6
*
*
*
3
L
3
2
L
1
L
2
Line
L
3
Open
Line
FSC
BLACK
*See SQI Wiring Diagram for correct lead.
3
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.
• Inspect for cleanliness. Clean exterior surfaces only.
Removing dust and grease on motor housing assures
proper motor cooling.
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
Fan Bearings
The fan bearings are provided prelubricated. Any specialized 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
RPM Temp °F Greasing Interval
Up to 1000
1000 to 3000
Over 3000
Any Speed < -30 Consult Factory
Any Speed > 200 1 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 120 6 months
120 to 200 2 months
-30 to 120 3 months
120 to 200 1 month
-30 to 120 1 month
120 to 200 2 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 advisable 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 conditions, 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 bearings after 3 years of operation to
prevent interruption of service.
For motors with provisions for relubrication, follow intervals
of the table below
Relubrication Intervals
Service
Conditions
Standard 3 yrs. 6 months 2 yrs. 6 months 1 yr. 3 months
Severe 1 yr. 3 months 1 yr. 3 months 6 months 1 months
Up to and
including 184T
1800 RPM
and less
Over 1800
RPM
NEMA Frame Size
213T-365T 404T and larger
1800 RPM
and less
Over 1800
RPM
1800 RPM
and less
Over 1800
RPM
Motors are provided with a polyurea mineral oil NGLI #2
grease. All additions to the motor bearings are to be with a
compatable grease such as Exxon Mobil 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 Company representative or
your nearest authorized electric motor service representative.
4
Changing Fan Speed
All belt driven fans with motors up to and including 5 HP
are equipped with variable pitch pulleys.
a. Loosen setscrew on motor pulley.
b. Open or close the groove facing to change the pitch
diameter.
Speed Reduction - Open the pulley in order that the
belt rests deeper in the groove.
Speed Increase - Close the pulley in order that the
belt rests higher in the groove. Ensure RPM limits
of the fan and the horsepower limits of the motor
are maintained.
c. Retighten pulley setscrew on one of the flat areas of
the motor shaft.
d. After the adjustment is made, check for proper belt
Maximum RPM
SQI-B
Size
120 2966 150 2692
135 2460 165 2687
150 2209 180 1958
165 2158 195 1901
180 1814 210 1702
195 1590 225 1797
210 1417 245 1775
225 1490 270 1525
245 1485 300 1271
270 1244 330 1208
300 1041 365 1000
330 992 402 995
365 833
402 714
Maximum RPM
90 3341 135 2624
SQI-HP
Size
Maximum RPM
e. Slide new bearings onto the shaft to the desired loca-
tion and loosely mount bearings onto the bearing support. 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 plate.
g. Align setscrews bearing to bearing and secure tightly
to the shaft.
NOTICE! Never tighten both pairs of setscrews
before securing bearing mounting bolts. This may
damage the shaft.
h. Inspect the wheel position again. If necessary, read-
just by loosening the bearing bolts and setscrews and
repeat from step e.
Wheel Replacement
a. Drill two 1/4” diameter holes, 180 apart centered
approximately between the shaft and the outside
diameter of the hub, 3/8” to 1/2” in depth.
b. Tap 1/4” holes to 5/16” thread with a 5/16” hole tap.
Do not drill or tap greater than recommended.
c. Screw the puller arms to the full depth of the threads
into the tapped holes. Align center of the puller with
the center of the shaft. Ensure all setscrews in the
hub, normally two, are fully removed.
d. Slowly remove wheel from the shaft.
tension. See the Belt and Pulley Installation section.
Pulley and Belt Replacement
a. Remove pulleys from their respective shafts.
b. Clean the motor and fan shafts.
c. Clean bores of pulleys and coat the bores with heavy
oil.
d. Remove grease, rust, or burrs from the pulleys and
shafts.
e. Remove burrs from shaft by sanding.
f. Place fan pulley on fan shaft and motor pulley on its
shaft.
NOTICE! Do not hammer the pulleys onto the shafts
because this may damage the bearings.
g. Tighten in place.
h. Install belts on pulleys and align as described in the
Belt and Pulley Installation section.
Bearing Replacement
The SQI-B fan bearings are pillow block ball bearings.
a. Remove outer access door.
b. Remove bolts/screws to inner housing access doors.
Open and remove the inner access door to reveal
bearings.
c. Remove the old bearing.
d. Remove any burrs from the shaft by sanding.
Above - Drilled hole placement.
Right - Wheel puller.
Recommended Puller
Lisle No. 45000 Sterling Wheel Puller. This puller is avail-
able at most automotive parts retail outlets.
5
Wheel-to-Inlet Clearance
The correct wheel-to-inlet
clearance is critical to
proper fan performance.
This clearance should be
verified before initial startup since rough handling
during shipment could
cause a shift in fan components. Refer to wheel/inlet
drawing for correct overlap.
Adjust the overlap by
loosening the wheel hub
and moving the wheel along
the shaft to obtain the correct value.
A uniform radial gap
(space between the edge of
the cone and the edge of
the inlet) is obtained by
loosening the inlet cone
bolts and repositioning the inlet cone.
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.
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.
Size Overlap
70 - 165 3/16”
180 - 245 1/4”
270 - 300 5/16”
330 - 365 3/8”
402 7/16”
Overheated Bearings
•Improper bearing lubrication
•Excessive belt tension.
6
SQI-D Parts List
1
2
3
4
5
Discharge View
Inlet View
Air Flow
6
Inlet View
Air Flow
Part
No.
1 Hex Bolts) Hex Bolt Hex Bolt Hex Bolt
2 Inlet Panel Inlet Panel Inlet Panel Inlet Panel
3 Inlet Inlet Inlet Inlet
4 Access Door Access Door Access Door Access Door
5 Electric Box Electric Box Electric Box Electric Box
6 Straightening Vanes Straightening Vanes Straightening Vanes Straightening Vanes
Not Shown:
7 Wheel Assembly Wheel Assembly Wheel Assembly Wheel Assembly
8 — — — Slot Cover
9 Motor Motor Motor Motor
Sizes 70-90 Size 120 Size 135 Sizes 150-165
Description
Discharge View
7
SQI-B Parts List
1
2
3
4
5
6
7
8
9
10
Discharge View
Inlet View
Air Flow
10
Inlet View
Discharge View
Air Flow
Part
No.
90 - 165 180 - 210 225 - 402
Description
1 Motor Plate Motor Plate Motor Plate
2 Hex Bolt Hex Bolt Hex Bolt
3 Inlet Panel Inlet Panel Inlet Panel
4 Inlet Inlet Inlet
5 Access Door Access Door Access Door
6 Straightening Vane Straightening Vane Straightening Vane
7 Driven Sheave Driven Sheave Driven Sheave
8 Belt Set Belt Set Belt Set
9 Driver Sheave Driver Sheave Driver Sheave
10 Motor Motor Motor
Not Shown:
11 Wheel Assembly Wheel Assembly Wheel Assembly
12 Slot Cover Slot Cover Slot Cover
13 Bearings Bearings Bearings
14 Shaft Shaft Shaft
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 modified 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 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. If you are entitled to warranty relief, a warranty adjustment 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 specifically 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 Offices: 2015 E. Dale Street Springfield, MO 65803 417.869.6474
lorencook.com
8
SQI IOM - Jan 2014
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