COOK TCN User Manual

TCN

Tubular Centrifugal Inline Fans

INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

This publication contains the installation, operation and
maintenance instructions for standard units of the TCN
Inline Blowers.

• TCN-B • TCNH-B • TCNE-B • TCNS-B

• TCNHE-B • TCNHS-B • TCNHU-B • TCN-D

• TCNH-D • TCNU-B
Carefully read this publication prior to any

installation or maintenance procedure.

Loren Cook catalog TCN 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 [phone],
extension 166; by FAX at [phone]; or by e-mail at
[e-mail].

For information on special equipment, contact Loren
Cook Company Customer Service Department at
[phone].

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.

Outdoor Storage

To maintain good working condition of a TCN 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.

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.

NOTICE! Extreme vibration is a serious problem that
may cause structural and mechanical failure. To help
vibration and noise from being transferred to the build­ing, isolators are recommended.

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 foot brackets. NOTICE! Never lift by the

shaft, motor, or housing.

TCN

Isolation Installation

Floor Mounted Spring Isolators

a. Mount fan and motor on unitary base (if supplied).
b. Elevate fan (or isolation base) to operating height and

insert blocks to hold in position.

c. Position isolators under the fan and vertically align by

inserting leveling bolt through mounting holes in the
fan or the base. The isolator must be installed on a
level surface.

d. Adjust the isolators by turning the leveling nut counter

clockwise several turns at a time alternately on each
isolator until the fan weight is transferred onto the iso­lators and the fan raises uniformly off the blocks. Then
remove the blocks.

e. Turn lock nut onto leveling bolt and secure firmly in

place against the top of the mounting flange or frame.

f. Secure isolators to mounting surface.

Rubber-In-Shear Isolator

Ceiling Mounted Spring Isolator

Figure 2 - Ceiling Mount Isolators

Rubber-In-Shear Ceiling Isolators

Duct Installation

Efficient fan performance relies on the proper installation
of inlet and discharge ducts. Be sure your fan conforms to
the guidelines below.

Non-Ducted Inlet Clearance

If your fan has an open inlet (no duct work), the fan must
be placed 1 fan wheel diameter away from walls and bulk­heads.

Spring Isolator

Figure 1 -Floor Mount Isolators

Floor Mounted Rubber-In-Shear (RIS) Isolators

a. Mount fan and motor on a unitary isolation base (if

supplied).

b. Elevate fan to provide room to insert isolators

between the fan and foundation and block in position.
c. Position isolators under fan and secure bolts.
d. Remove blocks and allow fan to rest on floor. Isolators

must be installed on a level surface (leveling should

not be required).
e. Secure isolators to mounting surface.

Ceiling Mounted Spring and Rubber-in-Shear (RIS) Iso­lators

a. Elevate fan to operating height and brace.
b. Attach threaded rod to overhead support structure

directly above each mounting hole. Rod should extend

to within a few feet of fan.
c. Attach isolator to end of threaded rod using a nut on

each side of isolator bracket.
d. Insert another section of threaded rod through the fan

mounting hole and isolator.
e. Attach two nuts to threaded rod in isolator.
f. Place adjusting nut and locking nut on threaded rod

near fan mounting bracket.
g. Alternately rotate adjusting nut at each mounting loca-

tion until the fan weight is uniformly transferred to the

isolators. Remove bracing.

MIN

1 DIA

Non-ducted Inlet Clearance

Free Discharge

Avoid a free discharge into the plenum. This will result in

lost efficiency because it doesn’t allow for a static regain.

Correct

Free Discharge

Incorrect

Inlet Duct Turns

For ducted inlets, allow at least 3 fan wheel diameters

between duct turns or elbows and the fan inlet.

Correct

Min 3

Dia

Incorrect

Inlet Duct Turns

Discharge Duct Turns

Where possible, allow 3 duct diameters between duct
turns or elbows and the fan outlet. Refer to the drawing at
the top of page 3.

2

Correct

1 foot

1/4 inch

Min 3

Dia.

Incorrect

Discharge Duct Turns

Wheel-to-Inlet Clearance

The correct wheel-to-inlet clearance is critical to proper
fan performance. This clearance should be verified before
initial start-up since rough handling during shipment could
cause a shift in fan components. Refer to wheel/inlet draw­ing below 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.

c. Lock the motor plate adjustment nuts in place.
d. Ensure pulleys are properly aligned. Refer to Figure 4.

Figure 3

Pulley Alignment

Pulley alignment is adjusted by loosening the motor pulley
setscrew and by moving the motor pulley on the motor shaft.
Figure 4 indicates where to measure the allowable gap for
the drive alignment tolerance.

Tolerance

Center Distance

Up thru 12” 1/16”

12” up through 48 1/8”

Over 48” 1/4”

Figure 4

Maximum

Gap

OFFSET ANGULAR OFFSET/ANGULAR

A

W

B

CENTER

DISTANCE

(CD)

GAP

X
Y

Z

GAP

Size Overlap

60 - 165 3/16”
180 - 245 1/4”
270 - 300 5/16”
330 - 365 3/8”

402 7/16”

445 - 490 1/2”

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 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 Figure 3.

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 (As shown in
A & B of Figure 4). Figure 5 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.

Figure 5

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.Lock off all power sources before

unit is wired to power source.

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.

3

Use of Variable Frequency Drives

Motors -

Motors that are to be operated using a Variable Fre­quency Drive (VFD) must be VFD compatible. At a mini­mum, this must be a Premium Efficiency motor with Class F
insulation. Motors that are not supplied by Loren Cook
Company should have the recommendation of the motor
manufacturer for use with a VFD.

Grounding -

The fan frame, motor and VFD must be connected to a
common earth ground to prevent transient voltages from
damaging rotating elements.

Wiring -

Line reactors may be required to reduce over-voltage

spikes in the motors. The motor manufacturer should be

consulted for recommended line impedence and usage of
line reactors or filters, if the lead length between the VFD
and the motor exceeds 10 feet (3m).

Fan -

It is the responsibility of the installing body to perform
coast-down tests and identify any resonant frequencies
after the equipment is fully installed. These resonant fre­quencies are to be removed from the operating range of
the fan by using the “skip frequency” function in the VFD
programming. Failure to remove resonant frequencies
from the operating range will decrease the operating life of
the fan and void the warranty.

Wiring Diagrams

Single Speed, Single Phase Motor

Ground A

L

T-1

T-4

Ground B

When ground is required, attach to ground A or B with no. 6 thread forming

1

Line
L

2

Wiring Diagrams

3 Phase, 9 Lead Motor
Y-Connection

Low Voltage

208/230 Volts

4

5

6

3

1

9

728

L2L

L

1

To reverse, interchange any 2 line leads.

3

High Voltage

460 Volts

456

789

3

12

L2L

L

3

1

3 Phase, 9 Lead Motor
Delta-Connection

Low Voltage

208/230 Volts

7
6

1

L

1

screw. To reverse, interchange T-1 and T-4.

2 Speed, 2 Winding, Single Phase Motor 2 Speed, 1 Winding, 3 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.

High Speed

L

1

L

2

Low Speed

Line

1

Together

2

Motor

3

L

1

4

L

5

2

6

Line

L

3

Motor

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

Single Speed, Single Phase, Dual Voltage 2 Speed, 2 Winding, 3 Phase

Ground A

L

T-5

J-10

Ground B

Link A
Link B

Low Voltage

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-5 and J-10 leads.

Ground A

Link A & B

High Voltage

T

Low Speed

3

Low Speed

T

L

1

Line

L

2

Motor

T
T

T
T

2
1

11
12
13

Low Speed

High Speed
High Speed
High Speed

To reverse: High Speed-interchange leads T11 and T12.
Low Speed-interchange leads T1 and T2. Both Speeds-interchange any 2
line leads.

Typical Fan Motor/Damper Motor Schematic

High Voltage

9

8

5

4

3

2

L

L

3

2

Low SpeedHigh Speed

460 Volts

789
456

3

12

L1L

L

3

2

L

1

1

L

2
3

4
5
6

2

L

3

Open

Line

L
L
L

1
2

Line

3

Fan

Motor

Transformer**

Damper

Motor*

Second
Damper

Motor

L3
L2
L1

Transformer**

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.

4