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
• TCN-D • TCNH-D
Carefully read this publication prior to any installa-
tion or maintenance procedure.
Loren Cook catalog,
describing the equipment, fan performance, available
accessories, and specification data.
For additional safety information, refer to AMCA publication 410-96,
Industrial and Commercial Fans
All of the publications listed above can be obtained from
Loren Cook Company by phoning 417/869-6474, extension
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.
Safety Practices for Users and Installers of
.
TCN
, provides additional information
.
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
age.
Delivery Receipt
any visible sign of dam-
Handling
Lift the fan by foot brackets. Never lift by the shaft, motor,
or housing.
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.
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.
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.
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.
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
fan in its original crate and protect it from dust, debris and
the weather.
Lubricants
on page 6. Also, store the
1
Note
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
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.
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.
MIN
1 DIA
Rubber-In-Shear Isolator
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.
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
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.
Size Overlap
100
120
Radial Clearance
Wheel/Inlet Overlap
Overlap
135
150
165
180
195
210
225
245
270
300
330
365
402
445
490
540
600
660
730
5/8”
3/4”
1”
1-1/4”
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
.
c. Lock the motor plate adjustment nuts in place.
d. Ensure pulleys are properly aligned. Refer to
1/4 inch
1 foot
Figure 3
Figure 4
Pulley Alignment
Pulley alignment is adjusted by loosening the motor pulley setscrew and by moving the motor pulley on the motor
shaft or by moving the entire motor along the motor mounting bracket.
Figure 4
illustrates correct and incorrect pulley alignment. A recommended method of inspecting the pulley
alignment is shown in
Figure 5
. With the shorter leg of a
carpenter’s square or other straight edge lying along the
case of the motor, adjust the position of the motor pulley (or
the motor until the longer leg of the square is parallel to the
belt.
Correct
Incorrect Incorrect
Figure 4
Incorrect
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.
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.
Figure 5
3
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
Low Voltage
208/230 Volts
4 5 6
17283
9
L
L
L
1
2
3
To reverse, interchange any 2 line leads.
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
L
1
Line
L
2
T
Low Speed
3
Low Speed
T
2
Low Speed
T
Motor
T
T
T
1
11
12
13
High Speed
High Speed
High Speed
To reverse: High Speed-interchange leads T
Low Speed-interchange leads T
line leads.
and T
. Both Speeds-interchange any 2
1
2
Typical Fan Motor/Damper Motor Schematic
Fan
Motor
Transformer**
Transformer**
L3
L2
L1
For 3 phase, damper motor voltage should be the same between L
L
. For single phase application, disregard L
2
available in 115, 230 and 460 volt models. The damper motor nameplate
. *Damper motors may be
3
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.
High Voltage
460 Volts
4 5 6
7 8 9
231
L
L
1
Low SpeedHigh Speed
and T
11
and
1
L
2
3
L
1
1
L
2
3
4
5
6
12
Line
2
L
3
Open
L
1
L
2
Line
L
3
.
Damper
Motor*
Second
Damper
Motor
Wiring Installation continued
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.
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).
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. 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.
4
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.
Tubular Centrifugal Inline
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
Recommended 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.
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.
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 oper-
ation. 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” 29 348 7/8”-9 2040
1/2” 1/4” 42 504
5/8” 5/16” 92 1104
3/4” 3/8” 120 1440
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
• 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.
, page 3.
5
Conditions Chart
RPM Temperature
100 Up to 120˚F Clean 6 to 12 months
500 Up to 150˚F Clean 2 to 6 months
1000 Up to 210˚F Clean 2 weeks to 2 months
1500 Over 210˚F Clean Weekly
Any
Speed
Any
Speed
Any
Speed
Any
Speed
Up to 150˚F Dirty 1 week to 1 month
Over 150˚F Dirty Daily to 2 weeks
Any Temperature Very Dirty Daily to 2 weeks
Any Temperature
Fan
Status
Extreme
Conditions
Greasing
Interval
Daily to 2 weeks
Lubricants
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.
Motor Bearings
Motor bearings are pre-lubricated and sealed. Under normal conditions they will not require further maintenance for
a period of ten years. However, it is advisable to have your
maintenance department remove and disassemble the
motor, and lubricate the bearings after three years of operation in excessive heat and or in a contaminated airstream
consisting of airborne abrasives.
Fan Bearings
TCN bearings are lubricated through a grease fitting on
the bearing and should be lubricated by the schedule,
ditions Chart
.
Con-
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.
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.
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 excessive 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.
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.
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
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.
Do not
6
q. Re-tighten setscrews on bearings, sheave, and
wheel. Recheck belt tension and adjust as needed.
r. Replace bearing cover.
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 avail-
able at most automotive parts retail outlets.
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.
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.
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.
7
TCN-B/TCNH-B Parts List
4
2
1
TCN-D/TCNH-D Parts List
1
3
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
2
6
5
3
7
8
9
10
11
8
Corporate Offices: 2015 E. Dale Street Springfield, MO 65803 417.869.6474
7
Item No. Discription
1 Foot Bracket
2 Inlet Cone
3 Access Door
4 Motor Plate
5 TEFC Motor
6 Field Wiring Compartment
7 Wheel
8 Foot
www.lorencook.com
6
5
TCN IOM - January 1999
8
4
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