COOK SQN Series, SQN-B, SQN-D, SQN-HP Installation, Operation And Maintenance Manual
®
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 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
• info@lorencook.com
• 417-869-6474 ext. 166
For information and instructions on special equipment,
contact Loren Cook Company at 417-869-6474.
SQN
Centrifugal Square Inline Fans
Rotating Parts & Electrical Shock Hazard:
Fans should be installed and serviced by qualied personnel 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 emergency and in order that maintenance personnel are provided 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.
Receiving
Inspection
Immediately, upon receipt of an SQN fan, carefully in-
spect 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 lifting holes.
NOTICE! Never lift by the shaft, motor or housing.
Lifting HolesLifting Holes
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 windmilling. 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 contact with personnel, tools or clothing.
Failure to follow these instructions could result in death or
serious injury.
SQN-B
The attachment of roof mounted fans to the roof curb as
well as the attachment of roof curbs to the building structure 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 prescribing the correct attachment based on construction ma-
terials, code requirements and environmental eects specic to the installation.
1SQN IO&M B51141-004
L
L2L
3
L
L
L
Low Voltage
High Voltage
Low Voltage
High Voltage
L
1
L
3
L
Line
L
1
T
1
T
2
T
3
Low Speed
Low Speed
Low Speed
High Speed
High Speed
High Speed
Motor
T
13
T
12
T
11
L
2
Line
L
3
Storage
Motor Plat
A
Motor Plat
Motor Plate
r
n
B
Ground A
G
round A
Ground
B
T-
Ground
B
J-1
Ground A
Ground A
e
Ground B
If the fan is stored for any length of time prior to installa-
tion, completely ll the bearings with grease or moisture-
inhibiting oil. Refer to Lubricants on page 5. Also, store the
fan in its original crate and protect it from dust, debris and
the weather.
To maintain good working condition of an 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.
e
djustment Nut
3 Phase, 9 Lead Motor Y-Connection
To reverse, interchange any 2 line leads.
208/230 Volts
460 Volts
456
4
5
6
789
1
728
3 Phase, 9 Lead Motor Delta-Connection
To reverse, interchange any 2 line leads.
08/230 Volts
7
6
1
L
1
3
9
12
3
460 Volts
9
8
5
4
3
2
L
L
3
2
789
456
12
3
e
Adjustment
Wiring Diagrams
Vari- Flow
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.
L
1
T-1
4
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.
T-1
4
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.
T-5
0
Link A
Link B
Low Voltage
L
1
T-5
Line
J-10
L
2
Line
L
2
High Speed
Low Speed
L
1
Line
L
2
Link A & B
L
Lin
L
2 Speed, 1 Winding, 3 Phase Motor
To reverse, interchange any 2 line leads. Motors require mag-
netic control.
Motor
High Speed
1
Together
2
3
L
4
1
L
5
6
2
L
3
Line
Low Speed
Motor
L
1
1
L
2
2
3
L
3
4
Open
5
6
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.
Typical Damper Motor Schematic
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 veried prior to connection. **A transformer may be provided in some in-
stallations to correct the damper motor voltage to the specied
voltage.
Fan
Motor
1
Transformer**
2
Damper
Motor*
2SQN IO&M B51141-004
Second
Damper
Motor
Transformer**
L3
L2
L1
SQI-D 70–90
BLACK
Blue (Medium)
White Line
NOTE: Insulate unused leads separately; leads are located at the
motor inside the unit.
Black (High)
Figure 1
1/4 inch
*
*
Red (Low)
FSC
SQN-D
FAN*
WHITE
FSC
*
*See SQN Wiring Diagram
for correct lead.
Installation
Motor Installation
To prevent damage to the fan during shipping, motors 3
HP and larger, and extremely heavy motors (cast iron or
severe duty) are shipped loose and must be eld 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 section.
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).
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.
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
If your fan is a direct drive, proceed to Blower 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.
Line
1 foot
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 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.
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.
OFFSET ANGULAR OFFSET/ANGULAR
A
W
B
CENTER
DISTANCE
(CD)
GAP
X
Y
Z
Figure 2
GAP
Tolerance
Center Distance Maximum Gap
Up thru 12” 1/16”
12” up through 48 1/8”
Over 48” 1/4”
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 dierence in
width. Figure 3 illustrates using a carpenter’s square to ad-
just the position of the motor pulley until the belt is parallel
to the longer leg of the square.
Figure 3
3SQN IO&M B51141-004
Blower Installation
Not on direct drive
(A)
Not on direct drive
Not on direct drive
Rear discharge
block off planel
The fan is shipped with the motor in the 12 o’clock position and the feet are shipped loose. (Feet may be under
weather cover)
1. Upon receipt of the fan, remove the eight (8) feet
shipped with the fan and ensure the feet are the correct type. Refer to Figure 4.
2. Determine how the fan is to be mounted. Refer to Foot
Mounting Illustrations.
3. Remove the 5/16” bolt(s) from the corner of the hous-
ing in which the foot is to be attached.
4. 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
View of A or E Foot Assembly
Figure 4
(E)
SQN Optional Side Discharge Installation
Upon receiving an SQN for a side discharge installation,
please note that the rear discharge block-o panel is installed on the unit and that the correct number of side discharge duct connection collars are provided (4 steel anges 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 6 for examples.
Side Discharge Duct
Connection Collar
NOTICE! Original Loren Cook Company labels must
remain with the unit. This may require swapping ac-
(B)
cess doors from one side to the other.
Final Installation Steps
Not on direct drive
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.
Operation
Not on direct drive
(C)
(D)
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
4SQN IO&M B51141-004
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