Loren Cook SQI Installation Manual

SQI

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.

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 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 417/869-647 4, exten sion
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.

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.

plate. Refer to the Wiring Diagrams, on page 3.

Lock off all power sources befo re unit is wired to power
source.

Direct drive - Wire the electrical box on the blower hous-

ing.

Belt drive - The motor can be wired directly since the

motor is external to the fan.

Handling

Lift the 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

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

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 name-

SQI-B

Motor Plate

Motor Plate
Adjustment Nut

Motor Plate Adjustment

Wiring Installation contin ued

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.

1 foot

1/4 inch

Figure 1

Figure 2

Tolerance

Center Distance

Maximum

Gap

Up thru 12” 1/16”
12” up through 48 1/8”

Over 48” 1/4”

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.

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 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.

OFFSET ANGULAR OFFSET/ANGULAR

A

W

B

CENTER

DISTANCE

(CD)

GAP

X
Y

Z

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.

Figure 3

e. Inspect for correct amperage with an ammeter and

correct voltage with a voltmeter.

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 loc ation 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.

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.

2

GAP

Fan

Motor

Damper

Motor*

Second
Damper

Motor

T

ransformer**

T

ransformer**

L3
L2
L1

Wiring Diagrams

T-1

T-4

Ground B

L

2

L

1

Ground A

Line

Ground A

Ground B

T-1

T-4

Low Speed

High Speed

L

1

L

2

Line

Ground B

J-10

T-5

Ground A

Link A
Link B

Low Voltage

Line

L

2

L

1

Ground A

Link A & B

L

1

L

2

Line

Ground B

T-5

J-10

Motor

1
2
3

4
5

6

Together

High Speed

Line

L

1

L

2

L

3

1
2
3

4
5

6

Open

Low Speed

Line

L

1

L

2

L

3

Motor

Low Speed
Low Speed
Low Speed

High Speed
High Speed
High Speed

T

3

T

2

T

1

T

11

T

12

T

13

Motor

L

1

L

2

L

3

Line

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

Single Speed, Single Phase Motor

Wiring Diagrams

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

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

When ground required, attach to ground A or B with No. 6 thread forming
screw. To reverse, interchange T-5 and J-10 leads.

Typical Damper Motor Schematic

If a problem is discovered, immediately sh u t th e fa n
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
operation. 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.

For 3 phase, damper mo­tor voltage should be the
same between L
For single phase applica­tion, disregard L
*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.

and L2.

1

To reverse, interchange any 2 line leads.

2 Speed, 1 Winding, 3 Phase Motor

To reverse, interchange any 2 line leads. Motors require magnetic control.

2 Speed, 2 Winding, 3 Phase

To reverse: High Speed-interchange leads T
Low Speed-interchange leads T
line leads.

and T2. Both Speeds-interchange any 2

1

and T12.

11

SQI-D 70-90

White Line

Black (High)

.

3

Blue (Medium)

Red (Low)

NOTE: Insulate Unused Leads Separately

FSC

WHITE

SQI-D

FAN*

FSC

BLACK

*See SQI Wiring Diagram for correct lead.

3

*
*

*

Line