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

Wiring Installation continued

NOTICE! Follow the wiring diagram in the dis-

connect 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).

Wheel Rotation

Test the fan to ensure the rota­tion of the wheel is the same as
indicated by the arrow marked
Rotation.

Tubular Centrifugal Inline

115 and 230 Single Phase Motors

Fan wheel rotation is set correctly at the factory. Chang­ing the rotation of this type of motor should only be
attempted by a qualified electrician.

208, 230, and 460, 3 Phase Motors

These motors are electrically reversible by switching two
of the supply leads. For this reason, the rotation of the fan
cannot be restricted to one direction at the factory. See
Wiring Diagrams for specific information on reversing
wheel direction.

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.

Final Installation Steps

a. Inspect fasteners and setscrews, particularly fan

mounting and bearing fasteners, and tighten according
to the recommended torque shown in the table Rec-

ommended Torque for Setscrews/Bolts.
b. Inspect for correct voltage with voltmeter.
c. Ensure all accessories are installed.

Operation

Pre-Start Checks

a. Lock out all the primary and secondary power

sources.
b. Ensure fasteners and setscrews, particularly those

used for mounting the fan, are tightened.
c. Inspect belt tension and pulley alignment.
d. Inspect motor wiring.
e. Ensure belt touches only the pulley.
f. Ensure fan and ductwork are clean and free of debris.
g. Inspect wheel-to-inlet clearance. The correct wheel-to-

inlet clearance is critical to proper fan performance.
h. Close and secure all access doors.
g. Restore power to the fan.

• Improper motor amperage or voltage.

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 Conditions Chart.

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.

Recommended Torque for Setscrews/Bolts

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

(IN/LB)

Hold Down Bolts

Wrench

Torque

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.

Regular inspections are recommended for fans exhaust­ing non-contaminated air.

It is recommended the following inspection be conducted
twice per year.

• Inspect bolts and setscrews for tightness. Tighten as
necessary.

• Inspect belt wear and alignment. Replace worn belts
with new belts and adjust alignment as needed. Refer
to Belt and Pulley Installation, page 3.

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).

5

• Bearings should be inspected as recommended in the
Conditions Chart.

• Inspect variable inlet vanes for freedom of operation
and excessive wear. The vane position should agree
with the position of the control arm. As the variable inlet
vanes close, the entering air should spin in the same
direction as the wheel.

• Inspect springs and rubber isolators for deterioration
and replace as needed.

• Inspect for cleanliness. Clean exterior surfaces only.
Removing dust and grease on motor housing assures
proper motor cooling. Removing dirt from the wheel
and housing prevent imbalance and damage.

Lubrication - Fan Bearings

TCN bearings are lubricated through a grease fitting on
the bearing and should be lubricated by the schedule,
Lubrication Conditions Chart.

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 burst
seals thus reducing bearing life.

In the event the bearing cannot be seen, use no more

than three injections with a hand-operated grease gun.

Before lubricating, the grease nipple and immediate
vicinity should be thoroughly cleaned without the use of
high pressure equipment. The grease should be supplied
slowly as the bearing rotates until fresh grease slips past
the seal. Excessive pressure should be avoided to prevent
seal damage.

Exceptions to the greasing interval chart:

• Periodic Applications (any break of one week or
more): it is recommended that full lubrication be per-

formed prior to each break in operation.

• Higher Temperature: it is recommended to halve the
intervals for every 30F increase in operating tempera­ture above 120F not to exceed 230F for standard
bearings; High Temperature bearings (optional) can
operate up to 400F.

• Vertical Shaft: it is recommended that the intervals
should be halved.

NOTICE! Loren Cook Company uses petroleum lubri­cant in a lithium base. Other types of grease should
not be used unless the bearings and lines have been
flushed clean. If another type of grease is used, it
should be a lithium-based grease conforming to NLGI
grade 2 consistency. A NLGI grade 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.

Lubrication Conditions Chart

Fan Class Fan Status Shaft Size

TCN

Inline

Blowers

Normal Conditions

(Clean, Dry & Smooth)

Extreme Conditions

(Dirty/Wet/Rough)

> 1-1/2” 10,000
< 1-1/2” 2,000
> 1-1/2” 2,000
< 1-1/2” 400

Maximum Interval

(operational hrs)

Lubrication - Motor Bearings

Motors are provided with prelubricated bearings. Any
lubrication instructions shown on the motor nameplate
supersede instructions below.

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 inter-

vals of the following table.

Relubrication Intervals

NEMA Frame Size

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

Severe 1 yr. 3 months 1 yr. 3 months6 months 1 months

Up to and

including 184T

1800 RPM

and less

Over 1800

RPM

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
compatible 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 representative or
your nearest authorized electric motor service representa­tive.

Changing Shaft Speed

All belt driven fans with motors up to and including 5 HP
are equipped with variable pitch pulleys. To change the fan
speed, perform the following:

a. Loosen setscrew on driver (motor) pulley and remove

key, if equipped.

b. Turn the pulley rim to open or close the groove facing.

If the pulley has multiple grooves, all must be adjusted
to the same width.

c. After adjustment, inspect for proper belt tension.

Speed Reduction

Open the pulley in order that the belt rides deeper in

the groove (smaller pitch diameter).

Speed Increase

Close the pulley in order that
the belt rides higher in the
groove (larger pitch diameter).
Ensure that the RPM limits of
the fan and the horsepower
limits of the motor are main­tained.

Pulley and Belt Replace­ment

a. Loosen and remove belts by

lowering motor mounting
plate with the four adjusting
nuts.

b. Remove pulleys from their

respective shafts.

Max Catalog RPM

Fan

Size

100 3382 4231
120 2894 3692
135 2305 2953
150 2162 2656
165 2092 2414
180 1817 2389
195 1578 2204
210 1404 1786
225 1534 1659
245 1485 1532
270 1250 1391
300 1038 1251
330 978 1141
365 817 1022
402 694 894
445 672 846
490 573 770

TCN TCNH

60 3899 4231
70 3942 4231
80 3600 4231

6

c. Clean the motor and fan shafts.
d. Clean bores of pulleys and coat the bores with heavy

oil.

e. Remove grease, rust, or burrs from the pulleys and

shafts.
f. Remove burrs from shaft by sanding.
g. Place fan pulley on fan shaft and motor pulley on its

shaft. Damage to the pulleys can occur when exces-

sive force is used in placing the pulleys on their

respective shafts.
h. Tighten in place.
i. Install belts on pulleys and align as described in the

Belt and Pulley Installation section.

Maximum RPM

TCN-B

Size

60 3942 - 60 4100
70 3942 - 70 4100

80 3942 - 80 4100
100 3942 - 100 4100
120 3047 - 120 3757
135 2375 - 135 2950
150 2116 2269 150 2647
165 1766 2138 165 2412
180 1610 1850 180 2388
195 1429 1663 195 2198
210 1277 1435 210 1926
225 1152 1569 225 1773
245 1015 1530 245 1559
270 876 1287 270 1414
300 837 1072 300 1247
330 716 1026 330 1173
365 624 835 365 1025
402 539 707 402 925
445 463 684 445 842
490 630 582 490 762

Bearing Replacement
The fan bearings are pillow block ball bearings.

a. Loosen and remove belts by lowering motor mounting

plate with the four adjusting nuts.

b. Remove the bearing cover by removing the four bolts

around the perimeter of the bearing cover. NOTICE!
Do not remove fan sheave yet.

c. Remove inlet cone by removing attaching bolts/nuts

around perimeter of the inlet plate.

d. Remove wheel by loosening setscrews and sliding off

shaft.

e. Record the location of the fan sheave from end of

shaft, and remove the sheave.

f. Record the distance from the bearing to the end of the

shaft.
g. Loosen setscrews on bearings and remove shaft.
h. Remove bearings and rubring and replace with new

bearings.
i. Slide shaft through bearings until shaft protrudes the

same amount as original shaft. Tighten setscrews.
j. Replace Rubring.
k. Replace fan sheave in original location.
l. Replace wheel but do not tighten yet.
m. Replace inlet cone. Wheel may need to be moved to

Maximum RPM

Non

Reinforced

Wheel

Reinforced

Wheel

TCNH-B

Size

Maximum

RPM

allow proper alignment. Care should be taken to insure

that inlet cone is centered inside wheel before and
after tightening attaching bolts.

n. Slide wheel on shaft to achieve proper wheel/inlet

overlap. Refer to Wheel-to-Inlet Clearance on page 3.
o. Replace and tighten belts.
p. Test run the fan.
q. Re-tighten setscrews on bearings, sheave, and

wheel. Recheck belt tension and adjust as needed.
r. Replace bearing cover.
s. Trim balance as necessary (.0785 in/sec max.).

Wheel Replacement for TCN & TCNH

TCN

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.

Recommended Puller

Lisle No. 45000 Sterling Wheel Puller. This puller is

available at most automotive parts retail outlets.

Above - Drilled hole placement.
Right - Wheel puller.

TCNH

The TCNH wheel has a pre-machined shoulder in the

hub for the use of most 2 and 3 jaw mechanical puller.

a. Align center of the puller with the center of the shaft.
b. Ensure all setscrews in the hub, normally two, are

fully removed.
c. Slowly remove wheel from the shaft.

After replacement trim balance as necessary (.0785 in/

sec max.).

7

1

2

3

4

5

6

7

8

9

10

11

TCN-B/TCNH-B Parts List

Item No. Description

1 Foot
2 Wheel
3 Foot Bracket
4 Motor
5 Inlet Cone
6 Inspection Door
7 Outer Housing
8 Motor Plate
9 Belt Tunnel

10 Bearing Plate

11 Bearing Cover

Not Shown Rub Ring

8

1

2

3

4

5

6

7

8

TCN-D/TCNH-D Parts List

Item No. Description

1 Foot Bracket
2 Inlet Cone
3 Access Door
4 Motor Plate
5 TEFC Motor
6 Field Wiring Compartment
7 Wheel
8 Foot

9

1

2

3

4

5

6

TCNE-B/TCNHE-B Parts List

1

2

3

4

5

6

TCNS-B/TCNHS-B Parts List

Item No. Description

1 TCNE Curb Cap
2 TCNE Top Cap Open
3 TCNE Cap Post (Bottom)
4 TCNE Top Cap Post (Top)
5 TCNE Top Cap Closed
6 TCNE Lifting Lug
7 Birdscreen (Not Shown)

See common parts listed on page 8.

Item No. Description

1 TCNS Curb Cap
2 TCNS Top Cap Open
3 TCNS Cap Post (Bottom)
4 TCNS Top Cap Post (Top)
5 TCNS Top Cap Closed
6 TCNS Lifting Lug
7 Birdscreen (Not Shown)

See common parts listed on page 8.

10

1

2

3

6

4

5

TCNU-B/TCNHU-B Parts List

Item No. Description

1 TCNU Curb Cap
2 TCNU Windband
3 TCNU Damper Assembly
4 TCNU Damper Stop
5 TCNU Lifting Lug
6 TCNU Nozzle

See common parts listed on page 8.

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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.

•Fan surge.

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.

•Incorrect voltage.

Overheated Bearings

•Improper bearing lubrication

•Excessive belt tension.

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

12

TCN IOM - Jan 2014