COOK ACSC User manual

1ACSC IO&M B51002-002
®
ACSC
Smoke Control Ventilator
INSTALLATION, OPERATION AND MAINTENANCE MANUAL
Receiving and Inspection
Carefully inspect the fan and acces-
sories for any damage and shortage
immediately upon receipt of the fan.
• Turn wheel by hand to ensure it turns
freely and does not bind
• Record on the Delivery Receipt any
visible sign of damage
Handling
Lift the fan by the shipping carton or lifting lugs provided
under top cap.
NOTICE! Never lift by the shaft, motor or housing.
Storage
If the fan is stored for any length of time prior to installa-
tion, store the fan in its original shipping crate and protect
it from dust, debris and weather.
Damper
Use of any backdraft dampers is NOT permitted. Fire
dampers and/or smoke dampers may be required in a
smoke control system. These dampers must meet the re-
quirements determined by the local code authority.
ACSC
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 ACSC:
Smoke Control Fans.
• ACSC/ACSC-HP/ACSC-XP
Carefully read this publication and any
supplemental documents prior to any
installation or maintenance procedure.
Loren Cook catalog, AC, provides additional information
describing the equipment, fan performance, available ac-
cessories 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.
Lifting Lugs

2ACSC IO&M B51002-002
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
and B
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 Voltage
460 Volts
8
2
4
9
3
5
L
1
L
3
L
2
L1L3
L2
3 Phase, 9 Lead Motor
Delta-Connection
To reverse, interchange any two line leads.
2 Speed, 2 Winding, 3 Phase
L
1
T
1
T
2
T
3
Low Speed
Low Speed
Low Speed
High Speed
High Speed
High Speed
Motor
T
13
T
12
T
11
L
2
Line
L
3
To reverse:
High Speed - interchange leads T11 and T12.
Low Speed - interchange leads T1and T2.
Both Speeds - interchange any two line leads.
Typical 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 or 460 volt models.
The damper motor nameplate voltage should be veried prior to
connection.
**A transformer may be provided in some installations to correct
the damper motor voltage to the specied voltage.
Routine Inspection
Establish a schedule for inspecting all parts of the fan.
The frequency of inspection depends on the operating
conditions and location of the fan.
ACSC fan is intended for general ventilation, and is UL
listed for Smoke Control Systems. The fan should not be
used to exhaust corrosive or contaminated air.
Regular, twice per year, inspections are recommended
and may be required per local codes.
Contact the local code authority for inspection
requirements.
Installation
If the fan was delivered with the motor unmounted, see
Belt and Pulley Installation.
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.
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).
Final Installation Steps
1. Ensure fasteners and setscrews, particularly fan
mounting and bearing fasteners, are tightened ac-
cording to the recommended torque shown in the Rec-
ommended Torque for Setscrews/Bolts table, page 3.
2. Inspect for correct amperage with an ammeter and
correct voltage with a voltmeter.
3. Ensure that all accessories are installed.
4. Test the fan to be sure the rotation is the same as indi-
cated by the arrow marked Rotation.
NOTICE! Do not allow the fan to run in the wrong di-
rection. This will overheat the motor and cause seri-
ous 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.
5. Inspect wheel-to-inlet clearance. Wheels may shift in
shipment. To realign wheel-to-inlet, shift upper bear-
ing so there is an equal radial clearance between the
wheel and inlet.
Wiring Diagrams
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.

3ACSC IO&M B51002-002
shown in the table. When the pulleys
are not the same width, the allowable
gap must be adjusted by half of the dif-
ference in width. Figure 3 illustrates
using a carpenter’s square to adjust
the position of the motor pulley until
the belt is parallel to the longer leg of
the square.
Operation
Pre-Start Checks
1. Lock out all the primary and secondary power sources.
2. Inspect and tighten fasteners and setscrews, particularly
fan mounting and bearing fasteners Refer to Torque chart.
3. Inspect belt tension and pulley alignment. Refer to Belt and
Pulley Installation.
4. Inspect motor wiring. Refer to Wiring Installation.
5. Ensure belt touches only the pulleys.
6. Rotate the wheel to ensure it rotates freely.
7. Ensure fan and ductwork are clean and free of debris.
8. Close and secure all access doors.
9. Restore power to fan.
Start-Up
Turn on the fan. In variable speed units, set fan to its low-
est 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.
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 - -
• Inspect bolts and setscrews for tightness. Tighten as
necessary. Refer to Recommended Torque chart.
• 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 for cleanliness. Clean exterior surfaces only.
Removing dust and grease on motor housing assures
proper motor cooling.
Belt and Pulley Installation
Belt tension is determined by the sound the belts make
when the fan is rst 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 ef-
ciency and possible damage can occur.
Do not change the pulley pitch diameter to change
tension. This will result in a di󰀨erent fan speed.
1. Loosen motor plate adjustment bolts and move motor
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.
2. Slide the motor plate back until proper tension is
reached. For proper tension, a deection of approxi-
mately 1/4” per foot of center distance should be ob-
tained by rmly pressing the belt. Refer to Figure 1.
3. Lock the motor plate adjustment bolts in place.
4. Ensure pulleys are properly aligned. Refer to Figure 2.
Tolerance
Center
Distance
Max.
Gap
Up through 12” 1/16”
12” through 48” 1/8”
Over 48” 1/4”
Figure 2
OFFSET ANGULAR OFFSET/ANGULAR
A
W
X
Y
ZB
CENTER
DISTANCE
(CD)
GAP GAP
Pulley Alignment
Pulley alignment is adjusted by loosening the motor pulley
setscrew and by moving the motor pulley on the motor shaft.
Figure 2 indicates where to measure the allowable gap
for the drive alignment tolerance. All contact points (indi-
cated by WXYZ) are to have a gap less than the tolerance
1 foot
1/4 inch
Figure 1

4ACSC IO&M B51002-002
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.
Maximum RPM
ACSC
HP Size
Maximum RPM
Standard Reinforced
150 1952 -
165 1728 -
180 1829 -
195 1570 -
210 1626 -
225 1435 -
245 1185 1234
270 1025 1049
300 980 1046
330 830 912
365 735 872
ACSC-XP Size Maximum RPM
165 2508
180 2396
195 2100
210 2126
225 1879
245 1616
270 1656
300 1391
330 1182
365 1132
Changing Shaft Speed
All belt driven ventilators (5HP or less) are equipped with
variable pitch pulleys. To change fan speed, per-form 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 limits
of the fan and the horsepower limits of the motor are
maintained.
Pulley and Belt Replacement
1. Clean the motor and fan shafts.
2. Loosen the motor plate mounting bolts to relieve the belt
tension. Remove the belt.
3. Loosen the pulley setscrews and remove the pulleys from
the shaft. If excessive force is required to remove the pulleys,
a three-jaw puller can be used. This tool, however, can easily
warp a pulley. If the puller is used, inspect the trueness of the
pulley after it is removed from the shaft. The pulley will need
replacement if it is more than 0.020 inch out of true.
4. Clean the bores of the pulleys and place a light coat of oil
on the bores.
5. Remove any grease, rust or burrs from pulleys.
6. Place the fan pulley on the fan shaft and the motor pulley on
the motor shaft. Damage to the pulleys can occur when ex-
cessive force is used in placing the pulleys on their respec-
tive shafts.
7. After the pulleys have been correctly placed back onto their
shafts, tighten the pulley setscrews.
Bearing Replacement
The fan bearings are pillow block type ball bearings.
1. Remove the old bearing.
2. Remove any burrs from the shaft by sanding.
3. Slide new bearings onto the shaft to the desired lo-
cation and loosely mount bearings onto the bearing
support. Bearing bolts and setscrews should be loose
enough to allow shaft positioning.
4. Correctly position the wheel and tighten the bearing
bolts securely to the bearing support.
Maintenance
Fan Bearings
NOTICE! The fan bearings are provided prelubri-
cated. Any specialized lubrication instructions on
fan labels supersedes information provided here-
in. Bearing grease is a petroleum lubricant in a
lithium base conforming to an NLGI #2 consisten-
cy. If user desires to utilize another type of lubri-
cant, they take responsibility for ushing bearings
and lines, and maintaining a lubricant that is com-
patible with the installation.
An NLGI #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.
Conditions Chart
RPM Temp °F Greasing Interval
Up to 1000 -30 to 120 6 months
120 to 200 2 months
1000 to 3000 -30 to 120 3 months
120 to 200 1 month
Over 3000 -30 to 120 1 month
120 to 200 2 weeks
Any Speed < -30 Consult Factory
Any Speed > 200 1 week
For moist or otherwise contaminated installations; divide the interval by
a factor of three. For vertical shaft installations divide the interval by a
factor of two.
Bearings should be relubricated in accordance with the
condition chart above.
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 damage
seal and reduce life through excess contamination and/or
loss of lubricant.
In the event that the bearing cannot be seen, use no more
than three injections with a hand operated grease gun.
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 main-
tenance department disassemble and lubricate the bear-
ings after three years of operation to prevent interruption
of service. For motors with provisions for relubrication, fol-
low intervals of the table below.
Relubrication Intervals
Service
Conditions
NEMA Frame Size
Up to and
Including 184T 213T- 365T 404T and Larger
1800
RPM &
Less
Over
1800
RPM
1800
RPM &
Less
Over
1800
RPM
1800
RPM &
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
NOTICE! Motors are provided with a polyurea min-
eral 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.

5ACSC IO&M B51002-002
5. Align setscrews bearing to bearing and secure tightly
to the shaft.
NOTICE! Never tighten both pairs of setscrews be-
fore securing bearing mounting bolts. This may
damage the shaft.
6. Inspect the wheel position again. If necessary, read-
just by loosening the bearing bolts and setscrews and
repeat from step 5.
Wheel Replacement
1. Drill two holes approximately centered between the
shaft and the edge of the hub OD with the following
dimensions:
• 1/4” diameter
• 3/8” to 1/2” deep
• 180° apart in face of hub
2. Tap 1/4” holes to 5/16” thread with the 5/16” hole tap.
Do not drill or tap any larger than recommended.
• 1/4” diameter
• 3/8” to 1/2” deep
• 180° apart in face of hub
3. Tap 1/4” holes to 5/16” thread with the 5/16” hole tap.
Do not drill or tap any larger than recommended.
4. Screw the puller arms into the tapped holes full depth
of threads (3/8” to 1/2” approximately). Align center of
puller with center of shaft. Make certain all setscrews
in hub (normally a quantity of two) are fully removed.
Work puller slowly to back wheel o󰀨 the shaft.
Recommended Puller
Lisle No. 45000 Steering Wheel Puller. This puller is
available at most automotive parts retail outlets.
Wheel PullerDrilled Hole Location
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 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.
OVERLAP
RADIAL
CLEARANCE
WHEEL SHROUD
INLET
Size Overlap
100–165 3/16”
180–245 1/4”
270–300 5/16”
330–365 3/8”
402 7/16”
445–490 1/2”
540–730 13/16”

6ACSC IO&M B51002-002
Drawing
Reference # Model Size Replacement Part # ACSC Part Description
1A, 1B
100 708942
Top Cap Assembly
120–135 708943
150–165 708944
180–195 708945
210–225 708946
245 708947
270 708948
300 708949
330 708950
365 708951
402 708952
445 708953
490 708954
1A
100 254381
Top Cap Lid
120–135 254382
150–165 254383
180–195 254384
210–225 254385
245 254386
270 254387
300 254388
330 254389
365 254390
402 254391
445 254392
490 254393
1B
100 275352
Top Cap Cylinder
120–135 275353
150–165 275355
180–195 275357
210–225 275359
245 275361
270 275362
300 275363
330 275364
365 275365
402 275366
445 275367
490 275368
2100–245 780680 Top Cap Snap Fastener (4)
270–490 Top Cap Snap Fastener (8)
3Consult
Factory
Consult
Factory Motor
4
100 254714
Spun Support Plate (round)
120–135 254715
150–165 254716
180–195 254717
210–225 254718
245 254719
270 254720
300 254721
330 254722
365 254723
402 254724
445 254725
490 254726
5
100 254505
Ba󰀪e
120 254670
135 254671
150 254672
165 254673
180 254674
195 254675
210 254676
225 254677
245 254514
270 254515
300 254516
330 254517
365 254518
402 254519
445 254520
490 254521
Parts List
ACSC
20
1B
1A
2
17 19 18
15
14
10
22
4
6
7
9
5
8
11
23
13
21
3
16
12
24
25

7ACSC IO&M B51002-002
Drawing
Ref. #
Model
Size
Replacement Part # ACSC Part
Description
Standard HP XP
6
100 705400 - -
Wheel Assembly
120 705401 - -
135 705402 - -
150 705403 705463 -
165 705404 705464 705484
180 705405 705465 705485
195 705406 705466 705486
210 705407 705467 705487
225 705408 705468 705488
245 705409 705469 705489
270 705410 705470 705491
300 705411 705471 705492
330 705412 705472 705492
365 705413 705473 -
402 705414 705474 -
445 705415 - -
490 705416 - -
100-
225 N/A - -
Reinforced Wheel
Assembly
245 705449 705503 -
270 705450 705504 -
300 705451 705505 -
330 705452 705506 -
365 705453 705507 -
402 705454 - -
445 705455 - -
490 705456 - -
7
100 503021 - -
Upper Post (4)
120 503034 - -
135 503037 - -
150 503043 503021 -
165 503047 503024 503019
180 503043 503024 503010
195 503047 503024 503014
210-
225 503061 503037 503016/ 503022
245 503221 503191 503166
270 503221 503191 503173
Upper Post (8)
300 503243 503211 503176
330 503241 503211 503183
365 503253 503211 503188
402 503257 - -
445 503285 - -
490 503286 - -
Drawing
Reference # Model Size Replacement Part #
ACSC Part
Description
8
100 254881
Base
120 254882
135 254883
150 254884
165 254885
180 254886
195 254887
210 254888
225 254889
245 254890
270 254891
300 254892
330 254893
365 254894
402 254563
445 254564
490 254565
970–490 Consult Factory Bird Screen
Not Shown 70–490 Consult Factory Conduit
(3/4 Liquid Tite)
10 100–490 126840 Solid Isolators (4)
11
100 503005
Lower Post (4)
120–135 503003
150–165 503010
180–195 503021
210–225 503024
245 503184
270 503184
Lower Post (8)
300 503191
330 503193
365 503199
402 503211
445 503211
490 503223
Drawing
Reference # Model Size Replacement Part #
ACSC Part
Description
12
100 254662
Outer Band
(wind band)
120–135 254663
150–165 254664
180–195 254665
210–225 254666
245–270 254667
300–330 254668
365–402 254669
445–490 254660
13
100 N/A
Ba󰀪e Brace (4)
120–135 280568
150–195 280570
210–300 280571
330 280570
365 280572
402 280571
445 280573 Ba󰀪e Brace (8)
490 280572
14
100 709299
Power Assembly
with Bearings
120–135 709571
150–165 709573
180–195 709591
210 709592
225 709593
245 709594
270 709595
300 709596
330 709597
365 709598
445 709583
490 709584
15
100 520750
Shaft
120–165 520751
180–210 520753
225–270 520754
300–490 520755
16
100–210 117310
Bearings (2)225–270 117312
300–490 117314
17 100–490 Consult Factory Drive Sheave
18 100–490 Consult Factory Driven Sheave
19 100–490 Consult Factory Belt Set
20 100–490 Consult Factory Vent Tube (2)
21 100–490 145041 Grommet (2)
22 100–490 Consult Factory Heat Shield
23 100–490 125431 NEMA 3
Wiring Box
24
100 254421
Inlet
120–225 N/A
245 254708
270 254710
300 254712
330 254433
365 254434
402 254435
445 254436
490 254437
25
100 415798
Flat Motor Mount
Plate (square)
120–165 415801
180–225 415802
245–270 415803
300–365 415804
402–490 415805

8ACSC IO&M B51002-002
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 modied 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 O󰀩ces, 2015 East Dale Street, Springeld, Missouri 65803-4637, explaining in writing, in detail, your complaint and referring to
the specic model and serial numbers of your fan. Upon receipt by Loren Cook Company of your written complaint, you will be notied, 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 ad-
justment 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 specically 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 O󰀩ces: 2015 E. Dale St. Springeld, MO 65803
Phone [phone] | Fax [phone] | lorencook.com
July 2017
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