COOK SQI User manual

1SQI IO&M B51151-003
®
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
• 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 lifting holes.
NOTICE! Never lift by the shaft, motor or housing.
SQI-B
SQI
Centrifugal Square Inline Fans
INSTALLATION, OPERATION AND MAINTENANCE MANUAL
Rotating Parts & Electrical Shock Hazard:
Fans should be installed and serviced by qualied 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 o, 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 qualied 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 veried 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 ocial 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 eects spe-
cic to the installation.
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 informa-
tion describing the equipment, fan performance, available
accessories and specication 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
• 417-869-6474 ext. 166
For information and instructions on special equipment,
contact Loren Cook Company at 417-869-6474.

2SQI IO&M B51151-003
Do not change the pulley pitch diameter to change ten-
sion. This will result in a dierent fan speed.
1. 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.
2. Adjust the motor plate until proper tension is reached.
For proper tension, a deection 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.
Tolerance
Center
Distance
Max.
Gap
Up through
12” 1/16”
12” through
48” 1/8”
Over 48” 1/4”
OFFSET ANGULAR OFFSET/ANGULAR
A
W
X
Y
ZB
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 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 dierence in width. Fig-
ure 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.
Final Installation Steps
1. Ensure that all accessories are installed.
2. Ensure that the blower is secured to ductwork.
3. Inspect wheel-to-inlet clearance. Ensure wheel does not
rub against the inlet.
4. Test the fan to ensure the rotation of the wheel is the same
as indicated by the rotation label.
5. 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 cor-
rect direction.
Storage
If fan is stored for any length of time, prior to installation,
completely ll bearings with grease or moisture-inhibiting
oil. Refer to pages 4-5. Store the fan in its original crate
and protect from dust, debris, and weather. To maintain
good working condition of a SQI 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 pre-
vent 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 bear-
ing parts
• Periodically inspect the unit to prevent damaging
conditions
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! All wiring should be in accordance with
local ordinances and the National Electrical Code,
NFPA 70. Ensure the power supply (voltage, fre-
quency, and current carrying capacity of wires) is
in accordance with the motor nameplate. Refer to
Wiring Diagrams, page 3-4.
Direct Drive
Wire the electrical box on the blower housing.
Belt Drive
The motor can be wired directly since the motor is exter-
nal to the fan.
Leave enough slack in the wiring to allow for motor move-
ment 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.
Motor Plate
Motor Plate
Adjustment Nut
Belt and Pulley Installation
Belt tension is determined by the sound the belts make
when the fan is rst 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 ef-
ciency and possible damage can occur.
Figure 3
Figure 2
1 foot
1/4 inch
Figure 1

3SQI IO&M B51151-003
Operation
Pre-Start Checks
1. Lock out all the primary and secondary power sources.
2. Inspect and tighten fasteners and setscrews, partic-
ularly fan mounting and bearing fasteners. Refer to
Recommended Torque chart.
3. Inspect belt tension and pulley alignment.
4. Inspect motor wiring.
5. Ensure fan and ductwork are clean and free of debris.
6. Close and secure all access doors.
7. 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
If a problem is discovered, immediately shut the
fan o. 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 rst 30
minute, 8 hour and 24 hour intervals of satisfactory op-
eration. During the inspections, stop the fan and inspect
as follows.
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.
Wiring Diagrams
Vari-Flow Motors
For EC or VF see EC Motor Wiring supplement. For VF2 see
PM wiring supplement.
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.
T-
1
T-
4
G
r
ou
n
d
B
L2
L
1
Ground A
Line
2 Speed, 2 Winding, Single Phase Motor
When ground required, attach to ground A or B with No. 6
thread forming screw. To reverse, interchange T-1 and T-4 leads.
G
round A
G
r
ou
n
d
B
T-1
T-
4
Low Speed
High Speed
L1
L2Line
Single Speed, Single Phase, Dual Voltage
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 B
J-1
0
T-5
Ground A
Link A
Link B
Low Voltage
Line
L2
L1
Ground A
Link A & B L
1
L
2
Lin
e
Ground B
T-5
J-10
3-Phase, 9 Lead Motor
To reverse, interchange any two line leads.
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
L1L3
L
2
L1L3
L2
3 Phase, 9 Lead Motor
Delta-Connection
2 Speed, 1 Winding, 3 Phase Motor
To reverse, interchange any 2 line leads. Motors require mag-
netic control.
Motor
1
2
3
4
5
6
Together
High Speed
Line
L
1
L2
L3
1
2
3
4
5
6
Open
Low Speed
Line
L
1
L2
L3
Motor
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 two line leads.
L1
T1
T2
T3Low Speed
Low Speed
Low Speed
High Speed
High Speed
High Speed
Motor
T13
T12
T11
L2
Line
L3

4SQI IO&M B51151-003
Typical Damper Motor Schematic
For 3 phase, damper motor voltage should be the same between
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 veried pri-
or to connection.
**A transformer may be provided in some installations to correct
the damper motor voltage to the specied voltage.
Fan
Motor
Damper
Motor*
Second
Damper
Motor
Transformer** Transformer**
L3
L2
L1
SQI-D 70–90
FSC
SQN-I
FAN*
WHITE
BLACK
FSC
*
Black (High)
Blue (Medium)
Red (Low)
Line
White Line
NOTE: Insulate unused leads separately; leads are located at the
motor inside the unit.
*
*
*See SQI Wiring Diagram
for correct lead.
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.
Yearly inspections are recommended for fans exhaust-
ing non-contaminated air. It is recommended the follow-
ing inspections be conducted twice per year.
1. Inspect bolts and setscrews for tightness. Tighten as
necessary. Refer to Recommended Torque chart.
2. Inspect belt wear and alignment. Replace worn belts
with new belts and adjust alignment as needed. Refer
to Belt and Pulley Installation.
3. Bearings should be inspected as recommended in the
Conditions chart.
4. 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 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 - -
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
lubricant, 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
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 -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
interval by a factor of three. For vertical shaft installations, divide
the interval by a factor of two.
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 a oil saturated
wicking material surrounding it. The initial factory lubrica-
tion is adequate for up to 10 years of operation under nor-
mal 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 units in severe conditions, lubrication intervals should
be reduced to half.
Figure 4

5SQI IO&M B51151-003
Motors without sleeve bearings (as previously described)
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 3
years of operation to prevent interruption of service.
For motors with provisions for relubrication, follow inter-
vals of the following table.
Relubrication Intervals
Service
Conditions
NEMA Frame Size
Up to & including
184T 213T-365T 404T & 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 months
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 Fan Speed
All belt driven fans with motors up to and including 5HP
are equipped with variable pitch pulleys.
1. Loosen setscrew on motor pulley
2. 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.
3. Retighten pulley setscrew on one of the at areas of
the motor shaft.
4. After the adjustment is made, check for proper belt
tension. See Belt and Pulley Installation.
Maximum RPM
SQI-B
Size
Maximum
RPM
90 3341
120 2966
135 2460
150 2209
165 2158
180 1814
195 1590
210 1417
225 1490
245 1485
270 1244
300 1041
330 992
365 833
402 714
SQI-HP
Size
Maximum
RPM
135 2624
150 2692
165 2687
180 1958
195 1901
210 1702
225 1797
245 1775
270 1525
300 1271
330 1208
365 1000
402 995
Pulley and Belt Replacement
1. Remove pulleys from their respective shafts.
2. Clean the motor and fan shafts.
3. Clean bores of pulleys and coat the bores with heavy oil.
4. Remove grease, rust or burrs from the pulleys and shafts.
5. Remove burrs from shaft by sanding.
6. 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.
7. Tighten in place.
8. Install belts on pulleys and align as described in Belt
and Pulley Installation.
Bearing Replacement
The SQI-B fan bearings are pillow block ball bearings.
1. Remove outer access door.
2. Remove bolts/screws to inner housing access doors. Open
and remove the inner access door to reveal bearings.
3. Remove the old bearing.
4. Remove any burrs from the shaft by sanding.
5. Slide new bearings onto the shaft to the desired location
and loosely mount bearings onto the bearing support. Bear-
ing 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 plate.
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, readjust by
loosening the bearing bolts and setscrews and repeat from
step 5.
Wheel Replacement
1. Drill two 1/4” diameter holes, 180° apart centered ap-
proximately between the shaft and the outside diam-
eter of the hub, 3/8” to 1/2” in depth.
2. Tap 1/4” holes to 5/16” thread with a 5/16” hole tap. Do
not drill or tap greater than recommended.
3. 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.
4. Slowly remove wheel from the shaft.
Wheel PullerDrilled Hole Location
Recommended Puller
Lisle No. 45000 Steering Wheel Puller. This puller is avail-
able at most automotive parts retail outlets.

6SQI IO&M B51151-003
Wheel-to-Inlet Clearance
The correct wheel-to-inlet clearance is critical to proper
fan performance. This clearance should be veried before
initial start-up since rough handling during shipment could
cause a shift in fan components. Refer to wheel/inlet draw-
ing for correct overlap.
Adjust the overlap by loosening the wheel hub and mov-
ing 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.
Wheel/Inlet Overlap
Size Overlap
70 - 165 3/16”
180 - 245 1/4”
270 - 300 5/16”
330 - 365 3/8”
402 7/16”
OVERLAP
RADIAL
CLEARANCE
WHEEL SHROUD
INLET
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.
Overheated Bearings:
• Improper bearing lubrication
• Excessive belt tension.

7SQI IO&M B51151-003
Parts List
SQI-D
1234
5
Discharge View
Inlet View
Air Flow
6
Part No. Sizes 70-90 Size 90-135 Sizes 150-165
1Hex Bolts Hex Bolts Hex Bolts
2Inlet Panel Inlet Panel Inlet Panel
3 - Inlet Inlet
4Access Door Access Door Access Door
5Electric Box Electric Box Electric Box
6 Straightening Vanes Straightening Vanes Straightening Vanes
Not Shown
7Wheel Assembly Wheel Assembly Wheel Assembly
8 - - Slot Cover
9Motor Motor Motor
10 Motor Plate Motor Plate Motor Plate
SQI-B
1
234567
8
9
10
Discharge View
Inlet View Air Flow
Part No. Description
1Motor Plate
2Hex Bolt
3Inlet Panel
4Inlet
5Access Door
6 Straightening Vane
7Driven Sheave
8Belt Set
9Driver Sheave
10 Motor
Not Shown
11 Wheel Assembly
12 Slot Cover
13 Bearings
14 Shaft

8SQI IO&M B51151-003
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 modied 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 Oces, 2015 East Dale Street, Springeld, Missouri 65803-4637, explaining in writing, in detail, your complaint and referring to
the specic model and serial numbers of your fan. Upon receipt by Loren Cook Company of your written complaint, you will be notied, 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 specically 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 Oces: 2015 E. Dale St. Springeld, MO 65803
Phone 417-869-6474 | Fax 417-862-3820 | lorencook.com
December 2018
This manual suits for next models
2
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