COOK TCN Series User manual

1TCN IO&M B51143-003
®
TCN
Tubular Centrifugal Inline Fans
INSTALLATION, OPERATION AND MAINTENANCE MANUAL
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-B
Rotating Parts & Electrical Shock Hazard:
Fans should be installed and serviced by qualied 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 qualied personnel. All eld installed wiring
must comply with National Electric Code (NFPA 70) and all
applicable local codes. Ensure the power supply (voltage,
frequency and current carrying capacity of wires) is in ac-
cordance with the motor nameplate.
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 veried 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 o󰀩cial 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 e󰀨ects spe-
cic to the installation.
This publication contains the installation, operation and
maintenance instructions for standard units of the TCN:
Inline Blowers.
• TCN-B
• TCNHE-B
• TCNH-D
• TCNH-B
• TCNHS-B
• TCNU-B
• TCNE-B
• TCNHU-B
• TCNS-B
• TCN-D
Carefully read this publication and any
supplemental documents prior to any
installation or maintenance procedure.
Loren Cook catalog, TCN, provides additional informa-
tion describing the equipment, fan performance, available
accessories and specication 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
• [email protected]
• 417-869-6474 ext. 166
For information and instructions on special equipment,
contact Loren Cook Company at 417-869-6474.

2TCN IO&M B51143-003
4. Remove blocks and allow fan to rest on oor. Isolators
must be installed on a level surface (leveling should
not be required).
5. Secure isolators to mounting surface.
Ceiling Mounted Spring and Rubber-in-Shear (RIS)
Isolators
1. Elevate fan to operating height and brace.
2. Attach threaded rod to overhead support structure di-
rectly above each mounting hole. Rod should extend
to within a few feet of fan.
3. Attach isolator to end of threaded rod using a nut on
each side of isolator bracket.
4. Insert another section of threaded rod through the fan
mounting hole and isolator.
5. Attach two nuts to threaded rod in isolator.
6. Place adjusting nut and locking nut on threaded rod
near fan mounting bracket.
7. Alternately rotate adjusting nut at each mounting loca-
tion until the fan weight is uniformly transferred to the
isolators. Remove bracing.
Ceiling Mounted Spring Isolator Rubber-in-Shear Ceiling Isolator
Figure 2 - Ceiling Mount Isolators
Duct Installation
E󰀩cient fan performance relies on the proper installa-
tion of inlet and discharge ducts. Be sure your fan con-
forms to the following guidelines.
Non-Ducted Inlet Clearance
If your fan has an open inlet (no duct work), the fan must
be placed one fan wheel diameter away from walls and
bulkheads.
MIN
1 DIA
Non-ducted Inlet Clearance
Free Discharge
Avoid a free discharge into the plenum. This will result in
lost e󰀩ciency because it doesn’t allow for a static regain.
Correct Incorrect
Free Discharge
Storage
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 Lubrication, page 6).Store the fan in its
original crate and protect it from dust, debris and weather.
Outdoor Storage
To maintain good working condition of a TCN when it is
stored outdoors or on a construction site, follow the addi-
tional steps below.
• Cover the inlet, 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 bear-
ing 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 eld mounted
by bolting the motor on the motor mounting plate in the ex-
isting 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.
Isolation Installation
Floor Mounted Spring Isolators
1. Mount fan and motor on isolation base (if supplied).
2. Elevate fan (or isolation base) to operating height and
insert blocks to hold in position.
3. 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.
4. 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 iso-
lators and the fan raises uniformly o󰀨 the blocks. Then
remove the blocks.
5. Turn lock nut onto leveling bolt and secure rmly in
place against the top of the mounting ange or frame.
6. Secure isolators to mounting surface.
Spring Isolator Rubber-in-Shear Isolator
Figure 1 - Floor Mount Isolators
Floor Mounted Rubber-In-Shear (RIS) Isolators
1. Mount fan and motor on an isolation base (if supplied).
2. Elevate fan to provide room to insert isolators between
the fan and foundation and block in position.
3. Position isolators under fan and secure bolts.

3TCN IO&M B51143-003
Inlet Duct Turns
For ducted inlets, allow at least three fan wheel diam-
eters between duct turns or elbows and the fan inlet.
Correct
Incorrect
MIN
3 DIA
Inlet Duct Turns
Discharge Duct Turns
When possible, allow three duct diameters between duct
turns or elbows and the fan outlet.
Correct
Incorrect
MIN
3 DIA
Discharge Duct Turns
Wheel-to-Inlet Clearance
The correct wheel-to-inlet clearance is critical to proper
fan performance. This clearance should be veried before
initial start-up since rough handling during shipment could
cause a shift in fan components. Refer to wheel/inlet draw-
ing below 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
60 - 165 3/16”
180 - 245 1/4”
270 - 300 5/16”
330 - 365 3/8”
402 7/16”
445 - 490 1/2”
OVERLAP
RADIAL
CLEARANCE
WHEEL SHROUD
INLET
Belt and Pulley Installation
Belt tension is determined by the sound the belts make
when the fan is rst started. The belts will produce a loud
squeal, which dissipates after the fan is operating at full
capacity. If belt tension is too tight or too loose, lost e󰀩-
ciency and damage can occur.
Do not change the pulley pitch diameter to change ten-
sion. This will result in a di󰀨erent fan speed.
1. Loosen motor plate adjustment bolts and move motor
plate in order that the belts can easily slip into grooves
on 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 deection of approximately 1/4”
per foot of center distance should be obtained by rmly
pressing the belt. Refer to Figure 3.
3. Lock the motor plate adjustment nuts in place.
4. Ensure pulleys are properly aligned. Refer to Figure 4.
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
Max.
Gap
Up through
12” 1/16”
12” up
through 48” 1/8”
Over 48” 1/4”
OFFSET ANGULAR OFFSET/ANGULAR
A
W
X
Y
Z
B
CENTER
DISTANCE
(CD)
GAP GAP
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 di󰀨erence in
width (as shown in A & B of Figure 4).
Figure 5 illustrates using a carpen-
ter’s square to adjust the position of
the motor pulley until the belt is par-
allel to the longer leg of the square.
1 foot
1/4 inch
Figure 3
Figure 4

4TCN IO&M B51143-003
Single Speed, Single Phase, Dual Voltage
Ground B
J-10
T-5
Ground A
Link A
Link B
Low Voltage
Line
L2
L1
Ground A
Link A & B
High Voltage
L1
L2
Line
Ground B
T-5
J-10
When ground is required, attach to ground A or B with No. 6
thread forming screw. To reverse, interchange T-5 and J-10 leads.
3-Phase, 9 Lead Motor
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
To reverse, interchange any two line leads.
2 Speed, 1 Winding, 3-Phase Motor
Motor
1
2
3
4
5
6
Together
High Speed
Line
L1
L2
L
3
1
2
3
4
5
6
Open
Low Speed
Line
L1
L2
L3
Motor
To reverse, interchange any two line leads. Motors require
magnetic control.
2 Speed, 2 Winding, 3-Phase
L1
T1
T2
T3Low Speed
Low Speed
Low Speed
High Speed
High Speed
High Speed
Motor
T13
T12
T11
L2Line
L3
To reverse: High Speed: interchange leads T11 and T12. Low
Speed: interchange leads T1and T2. Both Speeds: interchange
any two line leads.
Typical Fan Motor/Damper Motor Schematic
Fan
Motor
Damper
Motor*
Second
Damper
Motor
Tr
ansformer** Transformer*
*
L3
L2
L1
For 3-Phase, damper motor voltage should be the same be-
tween 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 veried pri-
or to connection.
**A transformer may be provided in some installations to correct
the damper motor voltage to the specied voltage.
Wiring Installation
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.
Use of Variable Frequency Drives
Motors
Motors that are to be operated using a Variable Fre-
quency Drive (VFD) must be VFD compatible. 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 con-
sulted for recommended line impedance and usage of line
reactors or lters if the lead length between the VFD and the
motor exceeds 10 ft (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 us-
ing 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
Vari-Flow
For EC or VF see EC Motor Wiring supplement. For VF2 see
PM wiring supplement.
Single Speed, Single Phase Motor
T-1
T-
4
Ground B
L2
L1
Ground A
Line
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
Ground A
Ground B
T-1
T-
4
Low Speed
High Speed
L1
L2
Line
When ground is required, attach to ground A or B with No. 6
thread forming screw. To reverse, interchange T-1 and T-4 leads.

5TCN IO&M B51143-003
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 per the Conditions Chart.
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.
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 - -
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.
Regular inspections are recommended for fans exhaust-
ing non-contaminated air.
It is recommended the following inspections be con-
ducted 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
• Bearings should be inspected as recommended in the
Lubrication 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 prevents imbalance and damage
NOTICE! Follow the wiring diagram in the discon-
nect 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.
115 and 230 Single Phase Motors
Fan wheel rotation is set correctly at the factory. Chang-
ing the rotation of this type of motor should only be at-
tempted by a qualied 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, page 4, for specic information on re-
versing 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 cor-
rect direction.
Final Installation Steps
1. Inspect fasteners and setscrews, particularly fan
mounting and bearing fasteners then tighten accord-
ing to the Recommended Torque chart.
2. Inspect for correct voltage with a voltmeter.
3. Ensure all accessories are installed.
Operation
Pre-Start Checks
1. Lock out all the primary and secondary power sources.
2. Ensure fasteners and setscrews, particularly those
used for mounting the fan, are tightened.
3. Inspect belt tension and pulley alignment.
4. Inspect motor wiring.
5. Ensure belt touches only the pulleys.
6. Ensure fan and ductwork are clean and free of debris.
7. Inspect wheel-to-inlet clearance. The correct wheel-
to-inlet clearance is critical to proper fan performance.
8. Close and secure all access doors.
9. Restore power to fan.
Start-Up
Turn on the fan. 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
NOTICE! If a problem is discovered, immediately shut
o the fan. Lock out all electrical power and check for
the cause of the trouble. Refer to Troubleshooting.
Tubular Centrifugal Inline

6TCN IO&M B51143-003
Relubrication Intervals
Service
Conditions
NEMA Frame Size
Up to and
Including 184T 213T-365T 404T and Larger
1800
RPM
and
Less
Over
1800
RPM
1800
RPM
and
Less
Over
1800
RPM
1800 RPM
and Less
Over
1800
RPM
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 month
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 Shaft Speed
All belt driven fans with motors up to and including 5HP
are equipped with variable pitch pulleys. To change the fan
speed, perform the following:
1. Loosen setscrew on driver (motor) pulley and remove
key, if equipped.
2. 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.
3. 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 lim-
its of the fan and the horsepower limits of the motor are
maintained.
Pulley and Belt Replacement
1. Loosen and remove belts by lowering motor mounting
plate with the four adjusting nuts.
2. Remove pulleys from their respective shafts.
3. Clean the motor and fan shafts.
4. Clean bores of pulleys & coat the bores with heavy oil.
5. Remove grease, rust or burrs from the pulleys and
shafts.
6. Remove burrs from shaft by sanding.
7. Place fan pulley on the fan shaft and the motor pulley
on the motor shaft. Damage to the pulleys can occur
when excessive force is used in placing the pulleys on
their respective shafts.
8. Tighten in place.
9. Install belts on pulleys and align as described in Belt
and Pulley Installation.
Lubrication
Fan Bearings
TCN bearings are lubricated through a grease tting on
the exterior of the fan housing 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 in-
tervals 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
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 ushed
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 viscos-
ity, low-torque, rust-inhibiting lubricant that is wa-
ter 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 Maximum Interval
(operation hrs)
TCN Inline
Blowers
Normal Conditions
(clean, dry & smooth)
> 1-1/2” 10000
< 1-1/2” 2000
Extreme Conditions
(dirty/wet/rough)
> 1-1/2” 2000
< 1-1/2” 400
Motor Bearings
Motors are provided with prelubricated bearings. Any lu-
brication instructions shown on the motor nameplate su-
persede 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 mainte-
nance 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.

7TCN IO&M B51143-003
Maximum RPM
Size Non-Reinforced Reinforced TCNH-B
60 3899 -4231
70 3942 -4231
80 3600 -4231
100 3382 -4231
120 2894 -3404
135 2333 -2953
150 2116 2162 2656
165 1833 2092 2414
180 1610 1817 2269
195 1429 1578 2095
210 1277 1404 1786
225 1152 1534 1659
245 1015 1485 1532
270 876 1250 1391
300 837 1038 1251
330 716 978 1141
365 624 817 1022
402 539 694 894
445 463 672 846
490 360 573 770
Bearing Replacement
The fan bearings are pillow block ball bearings.
1. Loosen and remove belts by lowering motor mounting
plate with the four adjusting nuts.
2. Remove the bearing cover by removing the four
bolts around the perimeter of the bearing cover.
NOTICE! Do not remove fan sheave yet.
3. Remove inlet cone by removing attaching bolts/nuts
around perimeter of the inlet plate.
4. Remove wheel by loosening setscrews and sliding o󰀨
shaft.
5. Record the location of the fan sheave from end of
shaft, and remove the sheave.
6. Record the distance from the bearing to the end of the
shaft.
7. Loosen setscrews on bearings and remove shaft.
8. Remove bearings and rub ring and replace with new
bearings.
9. Slide shaft through bearings until shaft protrudes the
same amount as original shaft. Tighten setscrews.
10. Replace rub ring.
11. Replace fan sheave in original location.
12. Replace wheel but do not tighten yet.
13. Replace inlet cone. Wheel may need to be moved to
allow proper alignment. Care should be taken to in-
sure that inlet cone is centered inside wheel before
and after tightening attaching bolts.
14. Slide wheel on shaft to achieve proper wheel/inlet
overlap. Refer to Wheel-to-Inlet Clearance, page 3.
15. Replace and tighten belts.
16. Test run the fan.
17. Re-tighten setscrews on bearings, sheave and wheel.
Recheck belt tension and adjust as needed.
18. Replace bearing cover.
19. Trim balance as necessary (0.0785 in/sec max.).
Wheel Replacement for TCN & TCNH
TCN
1. Remove inlet cone by removing bolts around perim-
eter of the inlet plate.
2. Remove wheel by loosening setscrews and sliding o󰀨
shaft if wheel will slide easily; if not, follow these steps
to pull wheel:
a. Drill two 1/4” diameter holes, 180° apart centered
between the shaft and the outside diameter of the
hub, 3/8” to 1/2” deep.
b. Tap 1/4” holes with a 5/16” tap. Do not drill or tap
greater than recommended.
c. Screw puller arms (recommend Lisle No. 45000
Steering Wheel Puller) to full depth of threads into
tapped holes. Align center of puller with center of
shaft. (See next page for details)
d. Ensure all setscrews in the hub (normally two) are
fully removed.
e. Slowly remove wheel from shaft.
3. Remove any burrs by ling or sanding shaft surface.
4. Replace wheel but do not tighten set screws.
5. Replace inlet cone. Care should be taken to insure
inlet cone is centered inside wheel before and after
tightening inlet attachment bolts.
6. Adjust wheel on shaft for proper alignment with inlet
(see Wheel-to-Inlet Clearance, page 3).
7. Once wheel and inlet are properly aligned, tighten
wheel setscrews.
8. Test run fan.
9. Re-tighten wheel setscrews to proper torque values
listed on page 5.
10. Trim balance as necessary (0.0785 in/sec max.).
TCNH
1. Remove inlet cone by removing bolts around perim-
eter of the inlet plate.
2. Remove wheel by loosening setscrews and sliding o󰀨
shaft if wheel will slide easily; if not, follow these steps
to pull wheel:
a. The TCNH wheel has a pre-machined shoulder in
the hub for the use of most two and three jaw me-
chanical pullers.
b. Align center of puller with center of shaft.
c. Ensure all setscrews in the hub (normally two) are
fully removed.
d. Slowly remove wheel from shaft.
3. Remove any burrs by ling or sanding shaft surface.
4. Replace wheel but do not tighten set screws.
5. Replace inlet cone. Care should be taken to insure
inlet cone is centered inside wheel before and after
tightening inlet attachment bolts.
6. Adjust wheel on shaft for proper alignment with inlet
(see Wheel-to-Inlet Clearance, page 3).
7. Once wheel and inlet are properly aligned, tighten
wheel setscrews.
8. Test run fan.
9. Re-tighten wheel setscrews to proper torque values
listed on page 5.
10. Trim balance as necessary (0.0785 in/sec max.).

8TCN IO&M B51143-003
Recommended Puller
Lisle No. 45000 Steering Wheel Puller. This puller is
available at most automotive parts retail outlets.
Drilled Hole Location
Wheel Puller
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 or fasteners too loose; belts worn or oily; belts
misaligned
• 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
• Bearing setscrews loose
• Fan surge
• Debris in impeller
• See page 4 for issues regarding VFD use
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 Motor:
• Improper bearing lubrication
• Excessive belt tension

9TCN IO&M B51143-003
Parts List
TCN-B/TCNH-B
1
2
3
4
567
8
9
10
11
Part No. Description Part No. Description
1Foot 7 Outer Housing
2Wheel 8Motor Plate
3 Foot Bracket 9 Belt Tunnel
4Motor 10 Bearing Plate
5Inlet Cone 11 Bearing Cover
6Inspection Door Not Shown Rub Ring
TCN-D/TCNH-D
1
23
4
5
6
7
8
Part No. Description Part No. Description
1 Foot Bracket 5 TEFC Motor
2Inlet Cone 6Field Wiring Compartment
3Access Door 7Wheel
4Motor Plate 8Foot

10TCN IO&M B51143-003
TCNE-B/TCNHE-B
TCNS-B/TCNHS-B
5
2
1
6
4
3
Part No. Description Part No. Description
1TCNE/S Curb Cap 5TCNE/S Top Cap Closed
2 TCNE/S Top Cap Open 6 TCNE/S Lifting Lug
3 TCNE/S Top Cap Post (Bottom) Not Shown Birdscreen
4 TCNE/S Top Cap Post (Top)
See common parts listed on page 9.